Land use change decreases soil carbon stocks in Tibetan grasslands

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	Land use change decreases soil carbon stocks in Tibetan grasslands
	Qiao, Na ; Xu, Xingliang ; Cao, Guangmin ; Ouyang, Hua ; Kuzyakov, Yakov
刊名	PLANT AND SOIL
	2015
卷号	395 期号:42006 页码:231-241
关键词	Alpine meadow Pasture Cropland Soil organic carbon Total nitrogen delta C-13 delta N-15
ISSN号	0032-079X
中文摘要	Land use is an important factor affecting soil organic carbon (SOC) dynamics and can produce positive C climate feedback, but its effects remain unknown for Tibetan ecosystems. Recent land use changes have converted the traditional winter Kobresia pastures of nomads in the northeastern Tibetan Plateau to Elymus pastures or even to cropland. Detailed SOC measurements up to 30-cm depth were combined with analysis of delta C-13, delta N-15, bulk density, microbial C, and N contents in three land use types. Bulk density was decreased by conversion from Kobresia pasture to cropland but increased by conversion to Elymus pasture. The loss of 1 % of SOC caused by land use change leads to delta C-13 increase of 0.8 aEuro degrees. Conversion to cropland significantly decreased SOC stocks (10 %) and microbial biomass C, but the C loss (1.6 %) was insignificant in Elymus pasture. Land use changes strongly increased soil delta N-15 in the top 5 cm. Conversion to Elymus pasture did not change the C stocks, but conversion to cropland decreased C stocks by 10 % within 10 years. Soil delta C-13 and delta N-15 data indicate acceleration of C and N cycling due to the replacement of Kobresia pasture by Elymus pasture and cropland.
资助信息	National Natural Science Foundation of China [31470560]; Knowledge Innovation Foundation Program for Outstanding Young Scholar of the Chinese Academy of Sciences [KZCX2-YW-QN302]; Key Laboratory of Tropical Forest Ecology of Chinese Academy of Sciences; German Science Foundation priority programme "Tibetan Plateau-Formation-Climate-Ecosystems (TiP)" [1372, KU 1184/14-1, KU 1184/14-2]
原文出处	10.1007/s11104-015-2556-8
语种	英语
公开日期	2015-11-19
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/9354]
专题	西双版纳热带植物园_动植物关系组
推荐引用方式 GB/T 7714	Qiao, Na,Xu, Xingliang,Cao, Guangmin,et al. Land use change decreases soil carbon stocks in Tibetan grasslands[J]. PLANT AND SOIL,2015,395(42006):231-241.
APA	Qiao, Na,Xu, Xingliang,Cao, Guangmin,Ouyang, Hua,&Kuzyakov, Yakov.(2015).Land use change decreases soil carbon stocks in Tibetan grasslands.PLANT AND SOIL,395(42006),231-241.
MLA	Qiao, Na,et al."Land use change decreases soil carbon stocks in Tibetan grasslands".PLANT AND SOIL 395.42006(2015):231-241.