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Article

Examining the Spatial Variations of Land Use Change and Its Impact Factors in a Coastal Area in Vietnam

1
School of Geography and Planning, Sun Yat-sen University, Guangzhou 510006, China
2
China Regional Coordinated Development and Rural Construction Institute, Sun Yat-sen University, Guangzhou 510275, China
3
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
*
Author to whom correspondence should be addressed.
Land 2022, 11(10), 1751; https://doi.org/10.3390/land11101751
Submission received: 13 September 2022 / Revised: 1 October 2022 / Accepted: 2 October 2022 / Published: 9 October 2022

Abstract

:
Controlling land use change in coastal areas is one of the world’s sustainable development goals and a great challenge. Existing research includes in-depth studies of land use change in relatively developed regions, but research on economically less developed but fast-growing regions is lacking. Since the reform and opening up in Vietnam, the influences of globalization have prompted the economy of the coastal area to develop rapidly, making it one of the less developed but rapidly developing regions where human activities and global changes vigorously interact. Therefore, taking the coastal area of Vietnam as the study area, we used the land use change index and random forest model to analyze the spatial variations of land use change and its impact factors. The research shows that: (1) land use shows a trend of continuous and rapid increase in construction land, with the proportion of construction land increasing from 2.72% in 2000 to 4.40% in 2020. However, natural landscapes, such as forests and grasslands, are decreasing. (2) Land use also shows obvious spatial variation characteristics, which are mainly manifested in the differences in change rate, development intensity, and distribution characteristics. Among them, the region with the largest rate of change was the Central Coastal Area. The region with the highest development intensity is the Mekong River Delta. (3) The main factors affecting land use change are foreign direct investment (FDI), the industrialization index, and population. Based on that, we analyzed the mechanism influencing the above factors from the perspectives of urbanization and population growth, and industrialization and park construction, as well as globalization and FDI, which can explain well the relationship between the impact factors and the spatial variation. This study can provide a valuable decision-making reference for formulating reasonable regional land development policies and is a good example of land use research for other rapidly developing areas.

1. Introduction

Globalization, as an important trend, has introduced extraordinary challenges and possibilities under the sustainable development goals for 2030 (SDG 2030). It is an important issue of global concern and has a profound influence on land use [1,2,3]. Coastal areas, as regions with concentrated influence from various human activities, provide a promising focal point for studying land use and land cover change (LUCC) in the context of globalization [4]. Coastal areas are characterised by way of high-level socioeconomic development and excessive population density. At present, about 11% of the world’s population lives in coastal areas inside 10 km of the coast. Of these, 65% live in coastal cities [5,6]. A giant population concentration leads to an abnormal scale and intensity of human development on coastal land [7]. Therefore, in contrast with other ecosystems, coastal areas are more prone to urbanization, globalization, and industrialization [8,9]. Due to the elements influencing their interaction, land use models in coastal areas are continuously changing with human activities and socioeconomic development [4,10]. In coastal areas with alternative forms of land use, such as built-up areas and urban development, land development frequently proceeds under a high-efficiency utilization mode, such as port-facing industries, development of industrial parks, and exclusive monetary areas [7,11,12,13]. Currently, the dynamic monitoring of land use change in coastal areas has become a necessary aspect of research on the impact of human activities on world change [14]. Research on land use change in coastal areas has explored the dynamic mechanism of land use change via the analysis and empirical comparison of cases in different regions [15,16,17,18]. Research has typically been targeted on hot spots and typical areas. Coastal land use change has been studied from distinctive perspectives. Most research has focused on the pattern of spatial variation in coastal land use change and the forces impacting these changes.
Existing research on land use change in coastal areas falls into two categories: (1) Spatial differentiation patterns of land use change in coastal areas. Studies in some areas have proven that natural landscapes, such as forests and grasslands, are increasing. The eastern coastal region of the United States is a typical example. There, gradual increases in recent years have resulted in forest coverage higher than 50% [19]. In addition, in Ban Don Bay, Thailand, the aerial extent of forest/mangrove land cover is also increasing, whilst areas of agriculture and wasteland are reducing [20]. However, research in other areas has proven that the areas of forest and grassland are decreasing, whilst construction land and farmland are increasing. In hot spots, such as the coastal vicinity of China, especially in the coastal area of northern Jiangsu [21], the coastal areas of Zhejiang Province [22], and the Bohai coastal area [23], the enlargement of construction land is especially pronounced. Other regions, such as the northwest coast of Mexico [24], the coastal areas of Turkey [25], and the northwest coastal area of Egypt [26], exhibit that there has been a significant expansion in construction land and farmland but a pronounced decrease in natural landscape areas. Studies in Southeast Asia also exhibit that natural landscapes, such as mangroves, are being destroyed and degraded by human settlements, agriculture, and coastal industrial park development [27,28]. (2) Studies on the factors impacting land use change in coastal areas. Research suggests that urbanization, industrialization, financial growth, and other human activities are the most important factors impacting land use change. In Costa Rica, human activities have a pronounced impact on coastal areas [29]. In the coastal area of Guangdong Province [30] and the Beijing-Tianjin-Hebei region [31], urbanization and industrialization have been the most important factors that led to amazing changes in the landscape pattern alongside the coastal areas. High population density, fast economic growth, and urbanization are regarded as the primary factors leading to the conversion of agricultural land in China [32]. In the Cochin coastal area of India, economic growth and industrialization have caused a large expansion of construction land [33]. Moreover, industrial park development, especially in areas surrounding Jakarta, was once the predominant factor inflicting extensive land use change in Indonesia [34]. Urbanization also influenced LUCC in India [35]. In summary, the existing research indicates that there are two different development tendencies of land use change: the growth of natural landscapes and the growth of construction land. Concurrently, in terms of influence factors, though the impact of urbanization, industrialization, and economic growth on land use change has been confirmed, the coastal resource use pattern and related land use change vary between and within nations. These changing patterns also depend on prominent factors such as natural background, population density, and urban development [36]. Specific to a certain region, the factors impacting land use change require further study.
Recently, scholars worldwide have designed many tools to give an explanation for land use change. These have included principal component and correlation analysis models, a couple of linear regression models, a global-scale dynamic land use allocation model, nonlinear models such as canonical correspondence analysis, cellular automata models, and system dynamics models [37,38,39,40]. These models have simulated the plausible causes of LUCC to a constrained degree. However, the linear regression model can only replicate the alternate in total land use in the region, and it is challenging to disclose the relationship between spatial heterogeneity and driving force. The cellular automata mannequin can simulate biophysical problems in LUCC; however, it is now not appropriate for the simulation of human decisions. The system dynamics model can fully reflect on the driving factors in the LUCC process; however, it lacks the potential to deal with spatial factors [41]. By adopting Earth Observation Data, the entropy that can be calculated from remote sensing data can be used as a proxy data predictor for the intensity of landscape fragmentation [42]. Some scholars have also studied the dynamics and spatial determinants of land change by integrating Landsat imagery and spatiotemporal economic data [43].
Canonical responsiveness analysis primarily based on the nonlinear speculation can intuitively learn about the socioeconomic driving mechanisms of land use change and divulge the interplay between land use change and socioeconomic development [44,45]. However, it can’t evaluate the relative importance of every impact factor. The random forest model is a data-mining approach based on random sampling and random feature selection. Its benefits are: (1) it can avoid overfitting, with moderate complexity and excessive accuracy; (2) an internally generated out-of-bag accuracy can be obtained to estimate the model performance; and (3) it can evaluate the significance of variables, which performs a key role in exploring the mechanism of construction land growth [46]. The random forest model is a natural nonlinear modeling approach that is appropriate for examining complicated datasets with many unknown features, such as the evolution and expansion of construction land. The random forest model has been extensively used to simulate land use change and city expansion [47,48]. The simulation accuracy is also high, which suggests that it is superb in fitting complicated problems and measuring the importance of factors. Therefore, we used the random forest model to determine the significance of every driving factor in the expansion of construction land.
In the context of economic globalization, with the continuous integration of developing areas into the global system, the pace of improvement in exceptionally poorly developed areas exceeds that of some more established regions. Dramatic and speedy economic improvement will have more and more profound impact on land-use change [1,2,49]. When examining the factors influencing land-use change, quite a few questions must be examined. For example, what is the vogue of evolving land use changes in a fast-growing region? What are the evolutionary characteristics of construction and ecological lands? What spatial variation characteristics will land use change present in specific regions? What are the main factors that cause this differentiation? Exploring the above questions can assist the creation of a valuable decision-making reference for formulating reasonable regional land development policies and represent a good example of land use research in other less-developed areas.
Vietnam is a typical developing but fast-growing region. In 2019, the per capita GDP was once only USD 2715, ranking 132 in the world. Since 2008, Vietnam’s GDP growth rate has remained above 5% and it reached 7.08% in 2018, making it the fastest-growing country in Southeast Asia. In addition, it additionally presents three important development characteristics: fast urbanization, continuous industrialization, and in-depth economic reforms (“opening up”). First, since 1990, the city population of Vietnam has increased by almost 21.56 million, with the percentage growing from 20.3% to 36.6%. Second, since 2000, Vietnam has transformed about 64,000 hectares of natural land to industrial land, accounting for 68% of the total natural land area converted. Third, since 1988, Vietnam’s foreign direct investment (FDI) has experienced a rapid growth trend in both the number of projects and the amount invested. As the frontier of Vietnam’s reform and opening up and representing an important engine to drive Vietnam’s economic development, the coastal area of Vietnam is much more developed than inland areas [5,6]. It is the area where human activity is the most intense [8,9]. This was a key element in our choice of the coastal zone of Vietnam as the focal point for this study.
The objectives of this study were: (1) to quantify and characterize the pattern of spatial variation in land use from 2000 to 2020 and reveal the trends and characteristics of the spatial variation of land-use change, (2) to identify the major drivers of land-use change, and (3) to determine the relationship between these drivers and the spatial variations.

2. Materials and Methods

2.1. Study Area

Vietnam is in the eastern portion of the Indo-China Peninsula, with geographical coordinates between 8°10′ N, 102°09′ E and 23°24′ N, 109°30′ E. The study area is the coastal province of Vietnam. Using the Vietnam Statistical Yearbook and considering the economic development and geographical location, we divided the study area into three regions (northern, central, and southern) and three subregions: the Red River Delta, Central Coastal Area, and Mekong River Delta (Figure 1). The Red River Delta is in northern Vietnam, near the capital city of Hanoi, with a high level of economic development. Located in southern Vietnam and driven by the proximity of Ho Chi Minh City, the economic development of the Mekong River Delta is relatively high. The Central Coastal Area is near the coastal zone, spanning a wide latitude, and its economic development level is relatively average, with Da Nang as the main city. In 2018, the population of Vietnam was 95.5404 million, mostly distributed in the Red River Delta, Mekong Delta, and southeast coastal areas.

2.2. Data

Global land use data from 2000/2010/2020 are from the GlobeLand30 2020 database. GlobeLand30 was developed using the POK method and covers ten land categories. GlobeLand30, a 30-meter resolution global land cover data product, was developed by the National Geomatics Center of China.1 The images for land cover classification are chiefly 30-meter multispectral images, including TM5 ETM+, and OLI multispectral images of Landsat (USA) and HJ-1 (China Environment and Disaster Reduction Satellite). Eight land cover types were selected for analysis in this study (Table 1). The elevation, slope, and population data were obtained from World Pop,2 with a resolution of 100 m. Line features such as roads, waterways, railways, coastlines, and rivers were obtained from natural earth3 and Open Street Map.4 Point features such as city centers, townships, and industrial parks were extracted from Open Development Vietnam.5 The economic and social statistical data used in this study mainly came from the Vietnam Statistical Yearbook.

2.3. Methods

2.3.1. Land Use Change Analysis Method

Comprehensive Index of Land Use Intensity

The calculation of the comprehensive index of land use intensity is commonly used to express the land use intensity [50]. The comprehensive index of land use intensity is normally used to specify the land use intensity, which can be described as:
L a = 100 i = 1 n ( A i     C i )
where La is the land use intensity comprehensive index in a certain region, Ci is the area percentage of land use type i, Ai presents the grade index of land use type i, and n refers to the number of land use types. According to the influence degree of human activities, land use can be divided into four levels, in which bare areas were assigned a factor value of 1, forest, grassland, and wetland were assigned a 2, farmland was assigned a value of 3, and construction land was assigned a 4.

Land Use Dynamic Degree

The land use dynamic degree is mainly used to characterize the transfer rate of land use change. It can not only reflect the land use change intensity on the whole but also facilitate the hot spots of land use change at different spatial scales. We use the change rate of a single land use type to quantitatively describe the velocity of regional land use change and the regional distinction of a given land use type change [51]. The formulation is as follows:
K = ( U b U a ) / U a 1 / T 100 %
where U a and U b are the number of a certain type of land use at the beginning of the study and the end of the study period; K is the dynamic attitude of a certain land use type during the research period; T is the research period, and the value of K is the annual change rate of a certain land use type.

Comprehensive Land Use Dynamic Degree

The comprehensive land use dynamic degree may be represented as:
LC = [ i = 1 n Δ L U i j 2 i = 1 n L U i ] 1 T 100 %
where Δ L U i j is the absolute value of the region where the i-th land use type changes to the non-i-th land use type for the duration of the monitoring period, L U i is the beginning time of monitoring the region of land use type I, and T is the length of the monitoring duration [52].

2.3.2. Random Forest Model

The Random Forest (RF) Model uses bootstrap sampling technology to extract N samples from N original sample sets, selects K attributes from all attributes, and selects the first-class segmentation attribute as the node to create a decision tree [53]. N choice timber is trained by using the bagging algorithm, and the end result is acquired by way of voting on the modeling results of all decision trees. RF has a robust generalization and steady overall performance [54]. The Random Forest package in R was used to construct the RF model. The importance of the features is sorted primarily based on the RF model. In addition, feature importance refers to the contribution rates of the variables. The larger the value, the more vital it is. In the RF model, feature importance normally refers to relative importance.
The random forest consists of a series of decision tree models {h(x, θ k ), k = 1, 2…}, where h( · ) represents the decision tree model and x is the input direction. The quantity and parameter set { θ k } are independent and identically distributed random vectors, and θ k determines the growth process of a single tree; The final output of RF is obtained by a simple majority voting method (for classification) or the simple average of single tree output results (for regression). Predictive variables can be numeric or categorical, and the variables need not be converted [44,45,55].

3. Spatial Variations of Land Use Change

3.1. Overall Evolution Trend of Land Use Change

From 2000 to 2020, the region and aerial proportion of construction land in the study region expanded continually (Table 2, Figure 2). In particular, construction land area extended by 353.00 hm2 in 2000–2010 and extended by 2064.74 hm2 in 2010–2020. The proportion of construction land to total land area multiplied from 2.72% in 2000 to 4.40% in 2020. The general consistency of the area changes in the two periods suggests that they are notably reliable and can replicate the general regional trend of the land use change [56]. In addition, the natural landscape areas, such as grasslands, forests, and wetlands, decreased. Among them, the grassland area decreased over the two periods by 172,804.14 hm2 and 29,607.39 hm2, respectively. The proportion of grasslands reduced from 8.36% in 2000 to 6.95% in 2020.
The construction land in each region demonstrated a substantial growth trend, with the largest increase in the Central Coastal Area (Figure 3). In addition, farmland trends varied by region. Specifically, the Red River Delta confirmed a trend of continuous reduction in farmland, with the area reducing by 75,374.46 hm2, whilst in the Central Coastal Area, farmland reduced after a sharp increase. From 2000 to 2010, farmland area improved by 210,746.16 hm2, and from 2010 to 2020, it decreased by 40,712.85 hm2. In the Mekong River Basin, farmland first increased and then decreased sharply. During 2000–2010, farmland area improved by 580.5 hm2, whilst during 2010–2020, it diminished by 73,788.21 hm2.

3.2. Regional Difference of Land Use Change

3.2.1. Difference in Change Rate

As can be seen from the comprehensive land use dynamic degree (Figure 4), the rate of change in each subregion was remarkably distinct. In the past 20 years, the areas with the greatest rate of change were in the Central Coastal Area, whereas the areas with the smallest change rate were in the Mekong River Delta. Specifically, from 2000 to 2010, the region with the greatest rate of change was the Central Coastal Area, where the comprehensive dynamic attitude index was 3.24 × 10−3. The region with the smallest rate of change was the Mekong River Delta, with a comprehensive dynamic attitude index of 5.10 × 10−4. From 2010 to 2020, the Mekong River Delta had the largest rate of change with a comprehensive dynamic attitude index of 1.85 × 10−3. The Red River Delta had the smallest rate of change with a comprehensive dynamic attitude index of 1.54 × 10−3. Notably, the variation ranges of each region were also distinct. The region with the largest variation range was the Central Coastal Area, where the comprehensive dynamic attitude index decreased by 48.95%.

3.2.2. Difference of Development Intensity

As can be seen from the comprehensive land use index (Figure 5), the land development intensity differed by subregion. Among them, the Mekong River Delta had the highest development intensity, with an average comprehensive land use index of 291.64 and construction land increasing by 2.012%. This was followed by the Red River Delta, with an average index of 238.99 and an increase in construction land of 1.739%. The lowest development intensity was in the Central Coastal Area, with an average index of 236.22 and an increase in construction land of 1.453%.

3.2.3. Difference of Distribution Characteristics

The predominant land use types in the Red River Delta are forest, farmland, and construction land. Among them, forest is mainly distributed in the southwest and northeast, whilst farmland and construction land are more prominent in coastal areas. The most notable characteristics of land use change in this region are the transformation of farmland into forest land and the transformation of farmland into construction land, which correspond to two hot spots on the southwest coast and the central coast, respectively. The Mekong River Delta is covered by a large area of farmland, with scattered construction land, forests, wetlands, and water bodies. The most prominent characteristic of land use change in this area is that farmland was converted into construction land, which corresponds to the area alongside the river and the estuary. The main land use types in the central coastal areas were forest land, farmland, and construction land. Among them, farmland and construction land were specifically distributed close to coastal areas. The most prominent feature of this area was the growth of construction land alongside the coastal region (Figure 6).

4. Factors Impacting Land Use Change

4.1. Identification of Impact Factors

The natural background conditions and human factors represented by these factors had a direct or indirect influence on regional land use evolution. To explore the impact factors that led to spatial variations in land use, we chose 15 factors closely associated to the spatial evolution of coastal land use based upon measurable and available data (Table 3). The natural background prerequisites and human factors represented by these factors had a direct or indirect impact on regional land use evolution.
Among them, elevation and slope are the explanatory variables of natural background conditions. Because the elevation of the study area fluctuates, the ground elevation and slope have a direct impact on the development of construction land [57].
Geographical factors are essential spatial factors that play a vital function in guiding and constraining the growth of construction land. It is an essential factor that determines the direction, scale, intensity, and speed of expansion of construction land [58]. Distance to a major road, distance to a waterway, distance to a railway, distance to a coastline, and distance to a river are the explanatory variables of geographical factors chosen because of the particularity of the coastal area.
The influence of social and economic factors (human factors), particularly the continuous advancement of urbanization and industrialization, is the primary factor inflicting the continuous expansion of construction land [59]. The distance to a city center, distance to a township, distance to an industrial park, the provincial industrialization index, and the provincial FDI have universal significance, which can better replicate the role of human factors [60].
From 2000 to 2020 (Figure 7), the top 5 factors driving construction land expansion were FDI, industrialization index, population, distance to town, and distance to city center, which shows that construction land expansion is sensitive to globalization, industrialization, and urbanization. Factors such as elevation, slope, distance to railway, and distance to waterway ranked lower, indicating that natural and traffic factors had less impact on the growth of construction land. Unlike previous studies, this study discovered that globalization, urbanization, and industrialization, which are the three most important human activities, ranked high in relative importance, indicating that human activities were still a dominant factor affecting the expansion of coastal construction land [61,62,63,64]. In Section 4.2, we analyze these three types of influencing factors in more detail. Factors such as the distance to rivers, coastal zones, and main roads are relatively important; however, factors such as the distance to waterways and railways are unimportant and are associated to the geographical conditions of the region. There are few railways and waterways in the study area. Therefore, transportation is more dependent on accessible roads and rivers. The relative importance of elevation and slope was low, which suggests that the effect of natural conditions on the growth of construction land was minimal.

4.2. Influence Mechanism of Impact Factors

Based on the above analysis, we further analyzed the mechanism impacting land use change from the perspectives of urbanization and population growth, industrialization and park construction, globalization, and FDI.

4.2.1. Urbanization and Population Growth

The continuous advancement and deepening of urbanization in Vietnam have driven the employment transfer direction. The continuous migration of rural populations from inland to coastal areas has resulted in the coastal region of Vietnam becoming one of the most densely populated areas in Southeast Asia. According to official data, Vietnam had a population of almost 97 million in 2019, of which about 50% was concentrated alongside the coastal area [65]. The fast boom of the population alongside the coastal area accelerated the development of housing construction, trade, and service industries, which in turn further promoted the process of urbanization. The promotion of urbanization required more urban areas and advanced infrastructure construction, which improved the rigid demand for construction land and further promoted the scope and speed of construction land expansion. Among them, the migration of rural surplus labor to big cities led to an increasing population in big cities, expanding the areal extent of construction land around big cities such as Hejing, Qinghe, and Haiphong City (Figure 8).

4.2.2. Industrialization and Industrial Park Construction

After the implementation of reforms and opening up in 1986, Vietnam’s industrialization made high-quality progress, and the percentage of secondary industries continues to rise. With the development of industry, industrial parks, as the main space carrier for the development of industrialization, play an increasingly indispensable role in the economic and social development of Vietnam [66]. In 1992, the first industrial area was built. After 20 years of development, by the end of 2018, Vietnam had established 326 industrial parks (Figure 9). With the continuous development of industrialization and the massive construction of coastal industrial parks, the demand for construction land is continuously increasing, which efficaciously promotes the expansion of coastal construction land. Currently, the total area of natural land cover is about 93,000 ha, which includes 64,000 ha of industrial land, accounting for about 68% of the total land area. Additionally, 250 parks had been established, with a land area of 68,000 ha. The remaining 76 parks, with a land area of 25,000 ha, are undergoing land acquisition, compensation, and infrastructure construction.

4.2.3. Globalization and Foreign Direct Investment

The socioeconomic development of Vietnam is largely influenced by globalization. The impact of globalization on Vietnam is reflected in FDI. Since 2013, Vietnam has attracted many FDI projects, with actual foreign investment reaching USD 20.38 billion in 2019. FDI, as the impact factor of the interaction between socioeconomic factors and land use, mainly affects the process of urbanization and industrialization, thus affecting land use change. Foreign investors have created many employment opportunities, directly or indirectly, by creating investments, mergers, and acquisitions. These employment opportunities promote population migration from rural to urban areas, thus promoting the development of urbanization. With the development of urbanization, construction land has been expanding from the city centers to the peripheral areas, which presents the scale expansion effect in space. Furthermore, because the technical level of foreign inventors is significantly higher than that of local enterprises, advanced production technology and management concepts have been introduced into Vietnam. Through industrial management, it will have a technology spillover effect on upstream and downstream industries, which will promote local technological progress. The advancement of technical levels directly affects the industrialization process in Vietnam. With the development of industrialization, various industrial parks have begun to rise and develop, which directly affects the transformation of land use types and promotes the expansion of construction land (Figure 10).

5. Discussion

This section further discusses the mechanism of different factors on the spatial differentiation of land use in the coastal areas of Vietnam. First, we found that land use in the coastal areas of Vietnam showed a trend of continuous and rapid increase in construction land and had observable spatial variation characteristics. This observation was comparable to the existing research on hot spots with rapid development [67,68,69,70]. Specifically, the research results of this study are similar to these of other regions in Vietnam, other countries in Southeast Asia, the South China Sea, and Asia. These areas are the same as Vietnam in terms of geographical position and stage of economic development, so they also exhibit comparable development trends in land use change. The identification results of impact factors exhibit that the joint actions of urbanization, industrialization, and globalization have led to the rapid growth of construction land in the study area, which is consistent with the present research, though the influence of common human factors such as population and location factors on land use has been widely validated [71,72,73,74,75,76,77]. However, this study especially examined the influence mechanism of human factors closely associated to globalization, urbanization, and industrialization, and analyzed the coupling mechanisms among them.
Second, coastal zones face serious land shortages. Land reclamation has become more frequent because of its low price and ease of use. As the primary approach of utilising the sea, land reclamation is prevalent in many countries, such as the Netherlands, Japan, and South Korea [78,79,80]. Countries in Southeast Asia also have a long record of land reclamation. Since the 1950s, Malaysia has been conducting coastal reclamation projects, most of which are concentrated alongside the coast of the Malacca Strait [81,82]. In Vietnam, Thailand, and Indonesia, large areas of mangroves have been used for aquaculture [83,84]. Concurrently, land reclamation has caused serious environmental problems, such as the reduction in fishery resources, sediment deposition, and wetland degradation [85].
Third, through our field investigation, we also found that the expansion of construction land caused by reclamation along the coastal area was remarkable. Moderate reclamation can give the marine environment time to recover and can generate economic profits. However, sea reclamation at a fast pace may cause serious damage to the environment [70].

6. Conclusions and Policy Implications

6.1. Conclusions

Taking the coastal province of Vietnam as the study area, we used data from the years 2000, 2010, and 2020 in the GlobeLand30 2020 database to analyze the spatial variations of land use change and its impact factors in coastal areas in Vietnam. The main conclusions are as follows.
(1) Overall, from 2000 to 2020, the area of construction land accelerated continually along with the proportion of construction land. The proportion of construction land multiplied from 2.72% in 2000 to 4.40% in 2020. Natural landscape areas, such as grasslands, forests, and wetlands, decreased. Construction land in each subregion showed a substantial growth trend, with the biggest areal increase in construction land in the Central Coastal Area. In addition, farmland trends varied by region.
(2) There are also observable spatial variation characteristics in the study area, which are embodied in three aspects. First, the rate of land use change in each subregion was remarkably distinct, with the greatest rate of change in the Central Coastal Area. Second, land development intensity differed significantly by region, with the highest development intensity in the Mekong River Delta. Third, the distribution characteristics of each subregion also varied.
(3) To further explore the factors impacting land use evolution, we chose 15 factors closely related to the spatial evolution of coastal construction land and constructed a random forest model. The research results confirmed that the major factors were FDI, industrialization index, and population. Finally, we analyzed the mechanisms influencing the above factors from the views of urbanization and population growth, industrialization and park construction, globalization, and FDI, which can properly describe the relationships between the impact factors and the spatial variations of land use.

6.2. Policy Implications

Therefore, we propose the following countermeasures. First, appropriate legislation must be formulated to promote coastal development and protection. At present, there are some issues in Vietnam’s governance, such as doubtful obligations and low coordination efficiency of local regulation enforcement agencies, which lead to the restriction of administrative power and the concentration of power in the comprehensive governance of coastal areas. In the future, the management of coastal areas must be supported by corresponding legal systems. Therefore, governments need to formulate a sound coastal management law system to supervise and regulate the resource development activities in coastal areas [86].
Second, the ecological cost compensation mechanism for land reclamation should be improved. This means that it is necessary to formulate legal guidelines and regulations related to ecological compensation for land reclamation, recuperation, governance, deposits for reclamation, and the ecological environment financial system. In addition, government departments should also formulate corresponding ecological environment construction funds to continuously improve and optimize the current financial expenditure structure to further increase the ecological compensation for land reclamation [87,88].
Third, the supervision of land reclamation should be strengthened. Relevant departments should work out a strict tracking and monitoring system for land reclamation projects and effectively monitor the implementation process of the entire project through spot checks. Concurrently, the relevant government departments should constantly improve the contents of the management system to provide a good guarantee of the rationality of the entire workflow of land reclamation.
Section Note:
1. Data sources: GlobeLand30 2020 (http://218.244.250.80/ accessed on 5 September 2022)
2. Data sources: World Pop (https://www.worldpop.org/ accessed on 5 September 2022)
3. Data sources: Natural Earth. Free vector and raster map data @ naturalearthdata.com.
4. Data sources: Open street map (https://www.openstreetmap.org/ accessed on 5 September 2022)
5. Data sources: Open Development Vietnam (https://vietnam.opendevelopmentmekong.net/ accessed on 5 September 2022)

Author Contributions

Conceptualization, Y.L.; methodology, J.Z.; validation, J.Z. and S.L.; formal analysis, Y.L.; investigation, Y.L.; resources, Y.L. and J.Z.; data curation, J.Z. and S.L.; writing—original draft preparation, Y.L. and J.Z.; writing—review and editing, Y.L. and S.L.; visualization, J.Z. and S.L.; supervision, Y.L.; project administration, Y.L. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by National Natural Science Foundation of China, grant numbers 41871114 and 42271180.

Data Availability Statement

Not applicable.

Acknowledgments

We appreciate the insightful comments and suggestions of the editor and reviewers.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. The location map of the study area.
Figure 1. The location map of the study area.
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Figure 2. Land use change of study area.
Figure 2. Land use change of study area.
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Figure 3. The land use change of subregions during 2000–2020 ((A): Red River Delta; (B): Central coastal area; (C): Mekong River Delta;).
Figure 3. The land use change of subregions during 2000–2020 ((A): Red River Delta; (B): Central coastal area; (C): Mekong River Delta;).
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Figure 4. The land use dynamic degree of subregions.
Figure 4. The land use dynamic degree of subregions.
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Figure 5. The development intensity of subregions (a) and changes in the proportion of construction land to the total area (b).
Figure 5. The development intensity of subregions (a) and changes in the proportion of construction land to the total area (b).
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Figure 6. The land use change of subregions in 2000–2020.
Figure 6. The land use change of subregions in 2000–2020.
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Figure 7. The importance of driving factors from 2000 to 2020.
Figure 7. The importance of driving factors from 2000 to 2020.
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Figure 8. Relationship between population growth and expansion of construction land.
Figure 8. Relationship between population growth and expansion of construction land.
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Figure 9. Distribution of coastal industrial parks.
Figure 9. Distribution of coastal industrial parks.
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Figure 10. Coupling mechanism of globalization, urbanization and industrialization.
Figure 10. Coupling mechanism of globalization, urbanization and industrialization.
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Table 1. Land use/cover classification system transformation.
Table 1. Land use/cover classification system transformation.
CodeLandcover ClassCodeLandcover Class
10Farmland50Wetland
20Forest60Water bodies
30Grassland80Construction land
40Shrubland90Bare land
Table 2. Land-use status of the study area in 2000, 2010, and 2020 (hm2).
Table 2. Land-use status of the study area in 2000, 2010, and 2020 (hm2).
Type200020102020
Farmland6,317,896.56,471,823.686,339,347.64
Forest5,904,898.925,934,586.235,887,351.26
Grassland1,204,677.991,031,873.851,002,266.46
Shrubland26,969.9429,186.126,731.26
Wetland195,389.55186,418.53162,846.72
Water bodies337,717.8287,861.85315,380.07
Construction land392,150.07427,449.78633,923.37
Bare land22,536.922,541.3133,981.12
Farmland6,317,896.56,471,823.686,339,347.64
Table 3. Impact factors index system.
Table 3. Impact factors index system.
VariableType
Dependent variableChanges construction land (2000–2010)0 or 1
Changes construction land (2010–2020)0 or 1
Natural backgroundElevationContinuous
SlopeContinuous
Geographical factorDistance to coastlineContinuous
Distance to the riverContinuous
Distance to the major roadContinuous
Distance to the waterwayContinuous
Distance to the railwayContinuous
Human factorsDistance to the city centerContinuous
Distance to the townshipContinuous
Distance to the industrial parkContinuous
Provincial industrialization indexContinuous
Provincial foreign direct investment dataContinuous
PopulationContinuous
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Liang, Y.; Zeng, J.; Li, S. Examining the Spatial Variations of Land Use Change and Its Impact Factors in a Coastal Area in Vietnam. Land 2022, 11, 1751. https://doi.org/10.3390/land11101751

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Liang Y, Zeng J, Li S. Examining the Spatial Variations of Land Use Change and Its Impact Factors in a Coastal Area in Vietnam. Land. 2022; 11(10):1751. https://doi.org/10.3390/land11101751

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Liang, Yutian, Jiaqi Zeng, and Shangqian Li. 2022. "Examining the Spatial Variations of Land Use Change and Its Impact Factors in a Coastal Area in Vietnam" Land 11, no. 10: 1751. https://doi.org/10.3390/land11101751

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