DOI: 10.1016/j.geoderma.2019.114069
论文题名: Responses of soil carbon decomposition to drying-rewetting cycles: A meta-analysis
作者: Zhang S. ; Yu Z. ; Lin J. ; Zhu B.
刊名: Geoderma
ISSN: 167061
出版年: 2020
卷: 361 语种: 英语
英文关键词: CO2 emission
; Drying-rewetting
; Soil carbon pool
; Soil organic matter
; Soil respiration
Scopus关键词: Carbon dioxide
; Global warming
; Moisture control
; Regression analysis
; Soil moisture
; CO2 emissions
; Drying-rewetting
; Soil carbon pool
; Soil organic matters
; Soil respiration
; Drying
; carbon dioxide
; carbon emission
; climate change
; decomposition
; meta-analysis
; soil carbon
; soil moisture
; soil organic matter
; soil respiration
英文摘要: Drying-rewetting cycles (DWC) is an important climate change factor in this century. The rewetting of dry soil stimulates carbon dioxide emission into the atmosphere, which is called the Birch effect. Although a large number of studies have been conducted to quantify the effect of DWC on cumulative soil respiration (CSR), their results are often contradictory, which offers us an opportunity to explore potential influencing factors and variability among studies. Using a meta-analysis including 524 observations from studies across different ecosystems and soil types, we investigated the responses of CSR to DWC. Our results indicated that DWC led to 72% stimulation of CSR compared with lower constant-moisture control (LC), 25% inhibition compared with upper constant-moisture control (UC), but minimal difference with mean constant-moisture control (MC), respectively. The meta-regression analysis showed that the DWC effect on CSR depended on mean annual precipitation, soil properties (clay content, C/N ratio, TN, pH), and the duration of drying in the DWC treatment. In addition, the effect size of CSR relative to UC was positively correlated with the number of DWC, suggesting that the slower-cycling soil carbon may be more vulnerable to DWC than the faster-cycling soil carbon and the “physical mechanism” may play a role in substrate release and CO2 emission after multiple DWC. Overall, our study provided a comprehensive analysis of the effects of DWC on CSR and showed that frequent drying-rewetting cycles induced by climate change might stimulate the loss of soil carbon to the atmosphere. Moreover, the similar CSR between DWC and MC (which have the same mean soil moisture content) suggests that the CO2 pulse after rewetting may be compensated by the low CO2 emission during the drying phase. Further research is needed to explore the responses of SOC pools with different turnover times to DWC and to investigate the DWC effects on soil respiration by in situ experiments and long-term studies. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158959
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing, 404100, China; School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Institute of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, China
Recommended Citation:
Zhang S.,Yu Z.,Lin J.,et al. Responses of soil carbon decomposition to drying-rewetting cycles: A meta-analysis[J]. Geoderma,2020-01-01,361