DOI: 10.1111/gcb.13613
论文题名: Regional variation in the temperature sensitivity of soil organic matter decomposition in China's forests and grasslands
作者: Liu Y. ; He N. ; Zhu J. ; Xu L. ; Yu G. ; Niu S. ; Sun X. ; Wen X.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 8 起始页码: 3393
结束页码: 3402
语种: 英语
英文关键词: decomposition
; forest
; grassland
; regional variation
; soil organic matter
; temperature sensitivity
Scopus关键词: decomposition
; electrical conductivity
; forest soil
; grassland soil
; pH
; soil organic matter
; soil temperature
; China
英文摘要: How to assess the temperature sensitivity (Q10) of soil organic matter (SOM) decomposition and its regional variation with high accuracy is one of the largest uncertainties in determining the intensity and direction of the global carbon (C) cycle in response to climate change. In this study, we collected a series of soils from 22 forest sites and 30 grassland sites across China to explore regional variation in Q10 and its underlying mechanisms. We conducted a novel incubation experiment with periodically changing temperature (5–30 °C), while continuously measuring soil microbial respiration rates. The results showed that Q10 varied significantly across different ecosystems, ranging from 1.16 to 3.19 (mean 1.63). Q10 was ordered as follows: alpine grasslands (2.01) > temperate grasslands (1.81) > tropical forests (1.59) > temperate forests (1.55) > subtropical forests (1.52). The Q10 of grasslands (1.90) was significantly higher than that of forests (1.54). Furthermore, Q10 significantly increased with increasing altitude and decreased with increasing longitude. Environmental variables and substrate properties together explained 52% of total variation in Q10 across all sites. Overall, pH and soil electrical conductivity primarily explained spatial variation in Q10. The general negative relationships between Q10 and substrate quality among all ecosystem types supported the C quality temperature (CQT) hypothesis at a large scale, which indicated that soils with low quality should have higher temperature sensitivity. Furthermore, alpine grasslands, which had the highest Q10, were predicted to be more sensitive to climate change under the scenario of global warming. © 2017 John Wiley & Sons Ltd 资助项目: Funding for this work came from the National Nature Science Foundation of China (2016YFC0500202, 2016YFC0500102), from the Natural Science Foundation of China (31290221, 41571130043, 31470506), and from the Program for Kezhen Distinguished Talents in Institute of Geographic Sciences and Natural Resources Research, CAS (2013RC102).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60867
Appears in Collections: 影响、适应和脆弱性
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作者单位: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Liu Y.,He N.,Zhu J.,et al. Regional variation in the temperature sensitivity of soil organic matter decomposition in China's forests and grasslands[J]. Global Change Biology,2017-01-01,23(8)