Regional variation in the temperature sensitivity of soil organic matter decomposition in China's forests and grasslands

CORC > 地理科学与资源研究所 > 中国科学院地理科学与资源研究所 > 生态系统研究网络观测与模拟重点实验室 > CERN水分分中心

	Regional variation in the temperature sensitivity of soil organic matter decomposition in China's forests and grasslands
	Liu, Y; He, NP; Zhu, JX; Xu, L; Yu, GR; Niu, SL; Sun, XM; Wen, XF
刊名	GLOBAL CHANGE BIOLOGY
	2017
卷号	23 期号:8 页码:3393-3402
关键词	decomposition forest grassland regional variation soil organic matter temperature sensitivity
ISSN号	1354-1013
英文摘要	How to assess the temperature sensitivity (Q(10)) 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 Q(10) 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 Q(10) varied significantly across different ecosystems, ranging from 1.16 to 3.19 (mean 1.63). Q(10) 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 Q(10) of grasslands (1.90) was significantly higher than that of forests (1.54). Furthermore, Q(10) significantly increased with increasing altitude and decreased with increasing longitude. Environmental variables and substrate properties together explained 52% of total variation in Q(10) across all sites. Overall, pH and soil electrical conductivity primarily explained spatial variation in Q(10). The general negative relationships between Q(10) 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 Q(10), were predicted to be more sensitive to climate change under the scenario of global warming.
学科主题	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	WILEY
WOS记录号	WOS:000404863300036
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/44029]
专题	地理科学与资源研究所_生态系统研究网络观测与模拟重点实验室_CERN水分分中心
推荐引用方式 GB/T 7714	Liu, Y,He, NP,Zhu, JX,et al. Regional variation in the temperature sensitivity of soil organic matter decomposition in China's forests and grasslands[J]. GLOBAL CHANGE BIOLOGY,2017,23(8):3393-3402.
APA	Liu, Y.,He, NP.,Zhu, JX.,Xu, L.,Yu, GR.,...&Wen, XF.(2017).Regional variation in the temperature sensitivity of soil organic matter decomposition in China's forests and grasslands.GLOBAL CHANGE BIOLOGY,23(8),3393-3402.
MLA	Liu, Y,et al."Regional variation in the temperature sensitivity of soil organic matter decomposition in China's forests and grasslands".GLOBAL CHANGE BIOLOGY 23.8(2017):3393-3402.