Fire effects on soil CH 4 and N 2 O fluxes across terrestrial ecosystems.

Autor: Guo J; Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, School of Tropical Agriculture and Forestry (School of Agricultural and Rural Affairs, School of Rural Revitalization), Hainan University, Haikou, Hainan 570228, China., Feng H; Key Laboratory of Ministry of Education for Genetics and Germplasm Innovation of Tropical Special Trees and Ornamental Plants, School of Tropical Agriculture and Forestry (School of Agricultural and Rural Affairs, School of Rural Revitalization), Hainan University, Haikou, Hainan 570228, China. Electronic address: fenghuili@hainanu.edu.cn., Peng C; Department of Biological Sciences, University of Quebec at Montreal, Montreal, Quebec H3C 3P8, Canada; College of Geographic Science, Hunan Normal University, Changsha, Hunan 410081, China., Du J; Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Science, Wuhan, Hubei 430223, China., Wang W; Co-Innovation Center for Sustainable Forestry in Southern China, College of Ecology and Environment, Nanjing Forestry University, Nanjing, Jiangsu 210037, China., Kneeshaw D; Department of Biological Sciences, University of Quebec at Montreal, Montreal, Quebec H3C 3P8, Canada., Pan C; College of Life Sciences, Anqing Normal University, Anqing, Anhui 246011, China., Roberge G; Department of Biological Sciences, University of Quebec at Montreal, Montreal, Quebec H3C 3P8, Canada., Feng L; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China., Chen A; Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Oct 20; Vol. 948, pp. 174708. Date of Electronic Publication: 2024 Jul 18.
DOI: 10.1016/j.scitotenv.2024.174708
Abstrakt: Fire, as a natural disturbance, significantly shapes and influences the functions and services of terrestrial ecosystems via biotic and abiotic processes. Comprehending the influence of fire on soil greenhouse gas dynamics is crucial for understanding the feedback mechanisms between fire disturbances and climate change. Despite work on CO 2 fluxes, there is a large uncertainty as to whether and how soil CH 4 and N 2 O fluxes change in response to fire disturbance in terrestrial ecosystems. To narrow this knowledge gap, we performed a meta-analysis synthesizing 3615 paired observations from 116 global studies. Our findings revealed that fire increased global soil CH 4 uptake in uplands by 23.2 %, soil CH 4 emissions from peatlands by 74.7 %, and soil N 2 O emissions in terrestrial ecosystems (including upland and peatland) by 18.8 %. Fire increased soil CH 4 uptake in boreal, temperate, and subtropical forests by 20.1 %, 38.8 %, and 30.2 %, respectively, and soil CH 4 emissions in tropical forests by 193.3 %. Additionally, fire negatively affected soil total carbon (TC; -10.3 %), soil organic carbon (SOC; -15.6 %), microbial biomass carbon (MBC; -44.8 %), dissolved organic carbon (DOC; -27 %), microbial biomass nitrogen (MBN; -24.7 %), soil water content (SWC; -9.2 %), and water table depth (WTD; -68.2 %). Conversely, the fire increased soil bulk density (BD; +10.8 %), ammonium nitrogen (NH 4 + -N; +46 %), nitrate nitrogen (NO 3 - -N; +54 %), pH (+4.4 %), and soil temperature (+15.4 %). Our meta-regression analysis showed that the positive effects of fire on soil CH 4 and N 2 O emissions were significantly positively correlated with mean annual temperature (MAT) and mean annual precipitation (MAP), indicating that climate warming will amplify the positive effects of fire disturbance on soil CH 4 and N 2 O emissions. Taken together, since higher future temperatures are likely to prolong the fire season and increase the potential of fires, this could lead to positive feedback between warming, fire events, CH 4 and N 2 O emissions, and future climate change.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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