No significant changes in topsoil carbon in the grasslands of northern China between the 1980s and 2000s

doi:10.1016/j.scitotenv.2017.12.254

	No significant changes in topsoil carbon in the grasslands of northern China between the 1980s and 2000s
	Liu, Shangshi 1; Yang, Yuanhe; Shen, Haihua 1; Hu, Huifeng ; Zhao, Xia ; Li, He 1; Liu, Taoyu 1; Fang, Jingyun1,2
	2018
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	624 页码:1478-1487
摘要	The grasslands of northern China store a large amount of soil organic carbon (SOC), and the small changes in SOC stock could significantly affect the regional C cycle. However, recent estimates of SOC changes in this region are highly controversial. In this study, we examined the changes in the SOC density (SOCD) in the upper 30 cm of the grasslands of northern China between the 1980s and 2000s, using an improved approach that integrates field-based measurements into machine learning algorithms (artificial neural network (ANN) and random forest (RF)). The RF-generated SOCD averaged 5.55 kg C m(-2) in the 19805 and 5.53 kg C m(-2) in the 2000s, and the change ranged from -0.17 to 022 kg C m(-2) at the 95% confidence level, suggesting that the overall SOCD did not vary significantly during the study period. However, the change in SOLD exhibited large regional variability: the topsoil of the Inner Mongolian grasslands experienced significant C loss (4.86 vs. 4.33 kg C m(-2)), while that of the Xinjiang grasslands exhibited an accumulation of C (5.55 vs. 6.46 kg C m(-2)). Furthermore, the topsoil C in the Tibetan alpine grasslands remained relatively stable (6.12 vs. 6.06 kg C m(-2)). A comparison of the different grassland types indicated that SOCD significantly decreased in typical steppe, whereas it increased in mountain meadow, and remained stable in the other grasslands (alpine meadow, alpine steppe, mountain steppe and desert steppe). Climate change could partly explain the changes in the SOCD of the different grassland types. Increases in precipitation could lead to SOC accumulation in temperate grasslands and SOC loss in alpine grasslands, while climate warming is likely to cause SOC loss in temperate grasslands. Overall, our study suggests that the grasslands of northern China remained a neutral SOC sink between the 1980s and 2000s. (C) 2017 Elsevier B.V. All rights reserved.
关键词	Alpine grasslands Artificial neural network Climate change Random forests Soil organic carbon Temperate grasslands
学科领域	Environmental Sciences
DOI	10.1016/j.scitotenv.2017.12.254
收录类别	SCI
语种	英语
WOS关键词	SOIL ORGANIC-CARBON ; NITROGEN DYNAMICS ; FOREST SOILS ; STOCK ; CLIMATE ; MATTER ; SENSITIVITY ; FEEDBACKS ; STORAGE ; LOSSES
WOS记录号	WOS:000426355900146
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1879-1026
资助机构	Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDA05050000] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31330012, 31321061, 31470525] ; National Basic Research Program of China on Global ChangeNational Basic Research Program of China [2014CB954001]
作者邮箱	jyfang@urban.pku.edu.cn
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/20667
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Dept Ecol, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Liu, Shangshi,Yang, Yuanhe,Shen, Haihua,et al. No significant changes in topsoil carbon in the grasslands of northern China between the 1980s and 2000s[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,624:1478-1487.
APA	Liu, Shangshi.,Yang, Yuanhe.,Shen, Haihua.,Hu, Huifeng.,Zhao, Xia.,...&Fang, Jingyun.(2018).No significant changes in topsoil carbon in the grasslands of northern China between the 1980s and 2000s.SCIENCE OF THE TOTAL ENVIRONMENT,624,1478-1487.
MLA	Liu, Shangshi,et al."No significant changes in topsoil carbon in the grasslands of northern China between the 1980s and 2000s".SCIENCE OF THE TOTAL ENVIRONMENT 624(2018):1478-1487.

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