soilorganiccarboncontentsaggregatestabilityandhumicacidcompositionindifferentalpinegrasslandsinqinghaitibetplateau

	soilorganiccarboncontentsaggregatestabilityandhumicacidcompositionindifferentalpinegrasslandsinqinghaitibetplateau
	Cao Zhiyuan 2; Wang Yong 2; Li Jie 1; Zhang Jinjing 2; He Nianpeng 1
刊名	journalofmountainscience
	2016
卷号	13 期号:11 页码:2015
ISSN号	1672-6316
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.
语种	英语
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/75964]
专题	中国科学院地理科学与资源研究所
作者单位	1.中国科学院地理科学与资源研究所 2.吉林农业大学
推荐引用方式 GB/T 7714	Cao Zhiyuan,Wang Yong,Li Jie,et al. soilorganiccarboncontentsaggregatestabilityandhumicacidcompositionindifferentalpinegrasslandsinqinghaitibetplateau[J]. journalofmountainscience,2016,13(11):2015.
APA	Cao Zhiyuan,Wang Yong,Li Jie,Zhang Jinjing,&He Nianpeng.(2016).soilorganiccarboncontentsaggregatestabilityandhumicacidcompositionindifferentalpinegrasslandsinqinghaitibetplateau.journalofmountainscience,13(11),2015.
MLA	Cao Zhiyuan,et al."soilorganiccarboncontentsaggregatestabilityandhumicacidcompositionindifferentalpinegrasslandsinqinghaitibetplateau".journalofmountainscience 13.11(2016):2015.