文献类型： 外文期刊

作者： Guo, Jiahuan ¹ ; Feng, Huili ¹ ; Peng, Changhui ² ; Du, Juan ⁴ ; Wang, Weifeng ⁵ ; Kneeshaw, Daniel ² ; Pan, Chang ⁶ ; Roberge, Gabrielle ² ; Feng, Lei ⁷ ; Chen, Anping ⁸ ;

作者机构： 1.Hainan Univ, Sch Trop Agr & Forestry, Sch Agr & Rural Affairs, Sch Rural Revitalizat,Key Lab Minist Educ Genet &, Haikou 570228, Hainan, Peoples R China

2.Univ Quebec Montreal, Dept Biol Sci, Montreal, PQ H3C 3P8, Canada

3.Hunan Normal Univ, Coll Geog Sci, Changsha 410081, Hunan, Peoples R China

4.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Hubei, Peoples R China

5.Nanjing Forestry Univ, Coll Biol & Environm, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Jiangsu, Peoples R China

6.Anqing Normal Univ, Coll Life Sci, Anqing 246011, Anhui, Peoples R China

7.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China

8.Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA

9.Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA

关键词： Fire; Soil; Methane; Nitrous oxide; Climate change; Terrestrial ecosystems

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.2； 五年影响因子：8.6 ）

ISSN： 0048-9697

年卷期： 2024 年 948 卷

页码：

收录情况： SCI

摘要： 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 CO2 fluxes, there is a large uncertainty as to whether and how soil CH4 and N2O 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 CH4 uptake in uplands by 23.2 %, soil CH4 emissions from peatlands by 74.7 %, and soil N2O emissions in terrestrial ecosystems (including upland and peatland) by 18.8 %. Fire increased soil CH4 uptake in boreal, temperate, and subtropical forests by 20.1 %, 38.8 %, and 30.2 %, respectively, and soil CH4 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 (NH4+-N; +46 %), nitrate nitrogen (NO3 --N; +54 %), pH (+4.4 %), and soil temperature (+15.4 %). Our meta-regression analysis showed that the positive effects of fire on soil CH4 and N2O 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 CH4 and N2O 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, CH4 and N2O emissions, and future climate change.