期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 825, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.153921
关键词
Fire; Soil respiration; Soil carbon storage; Fire frequency; Fire type; Post-fire time
资金
- National Natural Science Foundation of China [31901135]
- Guangdong Natural Science Founda-tion [2020A1515011257]
- Research Grants Council of the Hong Kong Special Administrative Region, China [CUHK14302014, CUHK14305515, CUHK14122521]
- Chinese University of Hong Kong [4052228]
- German Research Foundation [DFG-FZT 118, 202548816]
- DFG [Ei 862/29-1]
Fire has a significant impact on soil carbon cycling and storage, with one-time fire and wildfire having a greater effect compared to frequent fire and prescribed fire. The response of soil carbon dynamics to fire varies among different soil and ecosystem types. The recovery of soil carbon cycling and storage tends to occur within 20 years after one-time fire, but not after frequent fire.
Fire is a very common disturbance in terrestrial ecosystems and can give rise to significant effects on soil carbon (C) cycling and storage. Here, we conducted a global meta-analysis on the response of soil C cycling and storage across soil profiles (organic layer, 0-5 cm, 0-10 cm, 0-20 cm, and 20-100 cm) to fire reported in 308 studies across 383 sites and examined the role of fire frequency, fire type, soil type, ecosystem type, and post-fire time in regulating the response of soil C dynamics to fire. Overall, we found soil C cycling and storage were more responsive to one fire and wildfire as compared to frequent fire and prescribed fire, respectively. Soil respiration significantly decreased by 22 +/- 9% by one fire, but was not significantly affected by frequent fire across ecosystems. One fire significantly reduced soil C content in the organic, 0-10 cm, and 20-100 cm layers by 27 +/- 16%, 10 +/- 9%, and 33 +/- 18%, respectively, while frequent fire significantly reduced soil C content at a depth of 0-5 cm and 0-20 cm by 29 +/- 8% and 16 +/- 12%, respectively. Soil C cycling and storage showed little response to frequent prescribed fire. In addition, the response of soil C cycling and storage varied among different soil and ecosystem types, with a stronger response being observed in forest than in grassland. Within 20 years post-fire, soil C cycling and storage tended to recover only after one fire but not after frequent fire. We also found that soil physicochemical properties and microbial communities were more responsive to one fire than frequent fire, which could indirectly affect the effects of fire on soil C cycling and storage. The results of our study have filled some critical gaps in previous meta-analyses in fire ecology.
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