干旱区生态环境知识资源中心(Arid): Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

Arid

	Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau
	Cao Zhiyuan; Wang Yong; Li Jie; Zhang Jinjing; He Nianpeng
来源期刊	Journal of Mountain Science
ISSN	1672-6316
出版年	2016
卷号	13 期号:11 页码:2015-2027
英文摘要	Alpine grassland soils on Qinghai-Tibet Plateau store approximately 33.5 Pg of organic carbon (C) at O-O.75 m depth and 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 indices all 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 indices along this transect. Among all these C fractions, SOC content and aggregate stability were more closely associated with humic C and silt and clay sized C in comparison with WSOC, 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 stability in this region. The resistant and stable C fractions rather than labile C fractions are the major determinant of SOC stocks and aggregate stability.
英文关键词	Soil organic carbon Aggregate stability Humic acid Carbon-13 nuclear magnetic resonance Latitudinal transect Qinghai-Tibet Plateau
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5831435
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335723
作者单位	Cao Zhiyuan, College of Resource and Environmental Science, Jilin Agricultural University, Changchun, Jilin 130118, China.; Wang Yong, College of Resource and Environmental Science, Jilin Agricultural University, Changchun, Jilin 130118, China.; Zhang Jinjing, College of Resource and Environmental Science, Jilin Agricultural University, Changchun, Jilin 130118, China.; Li Jie, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modeling, Chinese Academy of Sciences, Beijing China.; He Nianpeng, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modeling, Chinese Academy of Sciences, Beijing China.
推荐引用方式 GB/T 7714	Cao Zhiyuan,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],2016,13(11):2015-2027.
APA	Cao Zhiyuan,Wang Yong,Li Jie,Zhang Jinjing,&He Nianpeng.(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 Zhiyuan,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.