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Atmosphere
Special Issues
Nitrogen Emissions in Agricultural and Forest Ecosystems
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Nitrogen Emissions in Agricultural and Forest Ecosystems

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Biosphere/Hydrosphere/Land–Atmosphere Interactions".

Deadline for manuscript submissions: closed (15 December 2023) | Viewed by 1621

Special Issue Editor

Dr. Zhe Chen

E-Mail Website
Guest Editor
College of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China
Interests: soil ecology; greenhouse gas emission; nitrogen transformation; climate change; land use
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nitrogen (N) is necessary for living organisms and is a limiting factor in increasing crop yields to feed the world’s growing population. The overuse of inorganic fertilizers to overcome the demand for food supplies often causes N losses through several pathways, including ammonia volatilization, leaching, and greenhouse gas emission, major environmental problems, and overall N balancing. Since forest and agricultural ecosystems comprise a large portion of nitrogen stocks, global change and fertilizer application might drive its volatilization due to the promotion of gaseous losses of nitric oxide (NO), nitrous oxide (N2O), and dinitrogen (N2), contributing positive feedback to prevent further climate change. However, there is still uncertainty regarding how global change, including climate change and land use change, affects the loss of gaseous N and N leaching in agricultural and forest ecosystems. Meanwhile, soil organic matter (SOM) is viewed as the organic source of C and N for plants and microorganisms, and it is also important for C and N sink in these soils. To obtain a better understanding of N emissions in forest and agricultural ecosystems, one needs to understand the humification, transformations, and chemistry of the various inputs and chemical substrate changes that these materials are subjected to on their path towards N transformation and N gas emissions.

Dr. Zhe Chen
Guest Editor

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Keywords

  • nitrogen transformation
  • N gas emission
  • agricultural and forest
  • plant and soil
  • soil organic matter
  • land use
  • climate change
  • fertilization

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Published Papers (1 paper)

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Research

15 pages, 3365 KiB  
Article
Effects of Climate Change and Nitrogen Addition on Carbon Loss in Alpine Wetland of Qinghai–Tibet Plateau
by Runhong Xu, Zhigang Wang and Jinfu Zhu
Atmosphere 2023, 14(9), 1342; https://doi.org/10.3390/atmos14091342 - 25 Aug 2023
Cited by 2 | Viewed by 1303
Abstract
Soil microorganisms and soil organic carbon (SOC) play important roles in ecosystem cycling, but there is a lack of clarity about the effects of nitrogen addition on soil microorganisms and SOC, as well as the key microbial taxa that influence SOC. This study [...] Read more.
Soil microorganisms and soil organic carbon (SOC) play important roles in ecosystem cycling, but there is a lack of clarity about the effects of nitrogen addition on soil microorganisms and SOC, as well as the key microbial taxa that influence SOC. This study was conducted in the alpine wetland of Xiaopo Lake in the Qinghai Lake basin, using NH4NO3 as the nitrogen source, three nitrogen addition gradients (N2: 2 g/m2, N5: 5 g/m2, N10: 10 g/m2), and a blank control treatment (N0: 0 g/m2), with three replicate experiments for each treatment. The main findings were as follows: (1) Both increased soil temperature and decreased precipitation reduced SOC content. SOC content gradually decreased with increasing nitrogen concentration; SOC was reduced by 3.36–29.54% and 8.57–26.66% at 0–15 cm and 15–30 cm soil depths, respectively. (2) Proteobacteria, Chloroflexi, Acidobacteria, and Actinobacteria were the main dominant species, and their changes determined the changes in the entire bacterial community. The relative abundance of Proteobacteria and Actinobacteria decreased under nitrogen addition; Acidobacteria increased significantly; and Chloroflexi did not change significantly. The overall abundance and diversity of soil bacteria showed an increasing trend. The number of soil bacteria is a key factor affecting SOC content, and an increase in the number and diversity of soil bacteria enhances their decomposition capacity, and thus, reduces SOC content. (3) Increased soil temperatures and decreased precipitation are associated with decreased SOC and are the main climatic factors affecting SOC. This study provides a reference for the rational utilization and management of wetland ecosystems under climate change. Full article
(This article belongs to the Special Issue Nitrogen Emissions in Agricultural and Forest Ecosystems)
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