Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2016 > Vol13 No.11

	Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau
	CAO Zhi-yuan; WANG Yong; LI Jie; ZHANG Jin-jing; HE Nian-peng
刊名	Journal of Mountain Science
	2016-11
卷号	13 期号:11 页码:2015-2027
关键词	Soil organic carbon Aggregate stability Humic acid Carbon-13 nuclear magnetic resonance Latitudinal transect Qinghai-Tibet Plateau
ISSN号	1672-6316
通讯作者	ZHANG Jin-jing
英文摘要	Alpine grassland soils on Qinghai-Tibet Plateau store approximately 33.5 Pg of organic carbon (C) at 0–0.75 m depthand play an important role in the global carbon cycle. We investigated soil organic C (SOC), water-soluble organic C (WSOC), easily oxidizable organic C (EOC), humic C fractions, aggregate-associated C, aggregate stability, and humic acid (HA) composition along an east-west transect across Qinghai-Tibet Plateau, and explored their spatial patterns and controlling factors. The contents of SOC, WSOC, EOC, humic C fractions and aggregate-associated C, the proportions of macro-aggregates (2-0.25) and micro-aggregates (0.25-0.053 mm), and the aggregate stability indicesall increased in the order alpine desert < alpine steppe < alpine meadow. The alkyl C, O-alkyl C, and aliphatic C/aromatic C ratio of HA increased as alpine desert < alpine meadow < alpine steppe, and the trends were reverse for the aromatic C and HB/HI ratio. Mean annual precipitation and aboveground biomass were significantly correlated with the contents of SOC and its fractions, the proportions of macro- and micro-aggregates,and the aggregate stability indicesalong this transect. Among all these C fractions,SOC content and aggregate stability were more closely associated withhumic Cand silt and clay sized C in comparison withWSOC, EOC, and macro- and micro-aggregate C. The results suggested that alpine meadow soils containing higher SOC exhibited high soil aggregation and aggregate stability. Mean annual precipitation should be the main climate factor controlling the spatial patterns of SOC, soil aggregation, and aggregate stabilityin this region.The resistant and stable C fractions rather than labile C fractions are the major determinant of SOC stocks and aggregate stability.
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/17616]
专题	成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2016_Vol13 No.11 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
推荐引用方式 GB/T 7714	CAO Zhi-yuan,WANG Yong,LI Jie,et al. Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau[J]. Journal of Mountain Science,2016,13(11):2015-2027.
APA	CAO Zhi-yuan,WANG Yong,LI Jie,ZHANG Jin-jing,&HE Nian-peng.(2016).Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau.Journal of Mountain Science,13(11),2015-2027.
MLA	CAO Zhi-yuan,et al."Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau".Journal of Mountain Science 13.11(2016):2015-2027.