Grassland Resilience to Woody Encroachment in North America and the Effectiveness of Using Fire in National Parks
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Ecological Resilience of Grasslands to Woody Encroachment
3.1.1. Woody Encroachment in the Great Plains of North America
3.1.2. Brush Management in the Great Plains Region
3.1.3. The Resilience of Grasslands: Resistance, Hysteresis, and Irreversibility
3.1.4. Thresholds of Fire Frequency, Intensity and Severity for Shrublands
Shrub Encroachers | Fire Return | Intensity/Severity | Resilience |
---|---|---|---|
Clonal and resprouting shrubs (Cornus drummondii, Rhus glabra, and Prunus americana), the Central Great Plains | 1- to 3-year fire returns [27] | Annual burning can delay, but not reverse, shrub encroachment in tallgrass prairies [57]. | Hysteresis |
160 KJ m−1s−1: may exclude juniper encroachment [53]. | |||
Resprouting serviceberry (Amelanchier alnifolia) and cherry (Prunus spp.), Canadian Prairies | A historical 5-year fire cycle [55] | A 5-year fire cycle: no change in shrub cover [55]. Annual burnings: decreased shrub cover but increased sucker cover [58] | Irreversibility |
An extremely severe wildfire: no change in shrub covers due to resprouting [6]. | |||
Resprouting salt cedar (Tamarix spp.), the Northern and Southern Great Plains [59] | Context-specific with historical fire frequency in specific locations | Annual: no more than 30% mortality due to sprouts [59]. | Irreversibility |
A high-severity fire: large top-kill but rapid resprouting [65]. |
3.1.5. Thresholds of Fire Frequency, Intensity and Severity for Woodlands
3.2. Brush Management Using Fire in Grassland National Parks
3.2.1. Fire Management of Woody Encroachment in Canadian and USA National Parks
3.2.2. Case Study: Grassland Transitions to Non-Native Prairies and Shrublands
Alternative States | National Parks | Fire Regimes | Fire Management Effectiveness | Management Recommendations |
---|---|---|---|---|
Grassland states | Grasslands National Park: invasive grass [48] | Prescribed fires, a 5-year fire cycle since 2000 [48], Suppressing all wildfires [77] | Effective to maintain the grasslands [48] | Reintroduced bison in 2005 and uncleared impacts [48] |
Shrubland transitions | Elk Island National Park: shrubs and aspen [76,79,81] | Prescribed fires since 1979 [82]; Fire suppression from 2002 to 2022 [79] | Not effective, due to fire suppression | Restore the fire cycle [76] |
Badlands National Park: non-native grass formed a near-monoculture | Historical fire return 8–25 years [78]; Prescribed fire since the 1980s [83] | Fire alone cannot reverse non-native grass [75] | Combinations of native seeding, fire, and/or herbicide [78] |
3.2.3. Case Study: Woodland Transitions
National Parks | Fire Regimes | Fire Management Effectiveness | Management Recommendations |
---|---|---|---|
Riding Mountain National Park: Aspen [5] | Prescribed fires (1996–2010) | Fire alone may be insufficient to suppress aspen | Combination of brush management [73] |
Prince Albert National Park: Aspen and shrubs [88] | Prescribed fires since 1975, a 5-year fire returns 2018 Rabbit Creek Wildfire | Insufficient, limited long-term effectiveness [19] | Interactions between fire and grazing [19] |
Waterton Lakes National Park: Aspen [91] | Prescribed fires since 1989, a 5-year fire cycle; 2017 Kenow Wildfire [89] | Prescribed fires have no impacts [55]; Wildfire was insufficient due to vigorous sprouting [6] | Improving fire severity in late season, bison [6] |
Lyndon B. Johnson National Historical Park: Native honey mesquite [84] | Prescribed fire in 2015 [84,90] | Unknown | Restoring fire cycles, high-intensity fires |
Chickasaw National Recreation Area: Ashe juniper, and red cedar [85,86] | Prescribed fire since 1998; several incidents of wildfires | Insufficient, due to resprouting | Mechanical removal of junipers in combination with fire treatments |
Lake Meredith National Recreation Area: mesquite [87] | Prescribed fires since 1998, several incidents of wildfires | Insufficient, reduced invasive grass, but not woody encroachment | High-intensity, shifting the timing of the prescribed burns |
3.2.4. Social–Political Constraints of Resilience-Based Fire Management on Woody Encroachment in National Parks
3.2.5. Resilience-Based Management Framework for Woody Encroachment
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Fire Impacts (Cited Time) | Indicators | |
---|---|---|
Biological attributes | Vegetation (50) | Vegetation and land use cover, biomass, community composition, abundance, diversity, comparative ecohydrology of trees, shrubs, grass, survival probability, seed removal, regeneration, reestablishment, regrowth, flowering status, plant type competition, spatial patterns. |
Wildlife (5) | Richness, occurrence, survival rates, habitat selection, and nest survival. | |
Physical attributes | Soil (8) | Carbon and nitrogen and relative contribution from grasses and shrubs, strength of soil water repellency, soil moisture, particle-size distribution, decomposition rates of leaf litter, aeolian activity. |
Habitat (3) | Habitat quality, forage species, landscape patterns of habitat. | |
Hydrological functions (7) | Soil hydrologic properties: soil water repellency, hydraulic conductivity, relative infiltration, runoff and rainfall, sediment. |
Brush Management (Cited Time) | Level 1 (Cited Time) | Level 2 (Cited Time) | Level 3 (Cited Time) |
---|---|---|---|
Fire type | Prescribed fires (48) | Wildfires (12) | Wildland fires (6) |
Fire interval | 1–3 years (15) | 3–8 years (11) | >8 years (12) |
Fire return intensity | Low intensity (2) (e.g., 627–1173 Kw/m2) | / | High (7) (e.g., 23,879–68,613 Kw/Kw/m2), 5291–8595 Kw/m2) |
Fire severity | / | / | Extreme severity (4) |
Seasonality | Wet periods during the growing season (6) | Other seasons (6) | Dry seasons (7) |
Fire recency | <one year (3) | 1–10 years (5) | >10 years (5) |
Fire with other brush management | Fire alone (43) | Fire combined with one (21) | Fire with two other methods (2) |
Tree Encroachers | Fire Returns | Intensity/Severity | Resilience |
---|---|---|---|
Non-resprouting Juniperus virginiana and Juniperus scopulorum, Northern and Central Great Plains [1] | >8 years allowed encroaching [53,64]; 15–20 years or complete fire suppression allowed close-canopy formation [1] | Fire intensity threshold of 160 KJ m−1s−1 [53,64]. | Hysteresis |
Extremely prescribed burnings that surpassed 160 KJ m−1s−1 caused 100% juniper mortality and successfully shifted juniper woodlands to grasslands [62]. | |||
Resprouting and clonal aspen in fescue grasslands, Canadian prairies | Fire suppression | As fire intensity increased from low-, moderate-, to high, aspen sprout density and growth rates increased [69]. | Irreversibility |
Resprouting mesquite, the Southern Great Plains | Fire suppression | High severity fires: top-kills, epicormic buds loss, and reduced resprout numbers but in the short-term [22,23]. | Irreversibility |
Resprouting and clonal eastern cottonwoods (Populus deltoides) in the mixed-grass prairies in the Southern Great Plains | Fire suppression | High-severity fire: high mortality but resprouting [60]. Browsing: reduced resprouting cover [65]. | Irreversibility |
Vegetation States | Intact Grasslands | Shrubland Transitions | Woodland Transitions: Non-Sprouting | Woodland Transitions: Resprouting Species |
---|---|---|---|---|
Grass resilience | Resistance | Hysteresis | Hysteresis | Irreversibly |
Monitoring ranking in national parks | Acceptable change in variation | Fire management concerns | Fire management concerns | Imminent loss |
Management effectiveness | Success | Limited effects | Limited effects | Limited effects |
Grass resilience in practice in national parks | Resistance | Hysteresis and irreversibility | Irreversibly | Irreversibly |
Social–political facilitations/constraints in national parks |
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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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Ling, H.; Wang, G.; Wu, W.; Shrestha, A.; Innes, J.L. Grassland Resilience to Woody Encroachment in North America and the Effectiveness of Using Fire in National Parks. Climate 2023, 11, 219. https://doi.org/10.3390/cli11110219
Ling H, Wang G, Wu W, Shrestha A, Innes JL. Grassland Resilience to Woody Encroachment in North America and the Effectiveness of Using Fire in National Parks. Climate. 2023; 11(11):219. https://doi.org/10.3390/cli11110219
Chicago/Turabian StyleLing, Han, Guangyu Wang, Wanli Wu, Anil Shrestha, and John L. Innes. 2023. "Grassland Resilience to Woody Encroachment in North America and the Effectiveness of Using Fire in National Parks" Climate 11, no. 11: 219. https://doi.org/10.3390/cli11110219