气候变化领域集成服务门户(CCPortal): Properties and periglacial processes in alpine meadow soils, western Nyaingentanglha Mountains, Tibet

CCPortal

DOI	10.1016/j.quaint.2010.06.003
	Properties and periglacial processes in alpine meadow soils, western Nyaingentanglha Mountains, Tibet
	Wang, Liqiang; Yi, Chaolu
通讯作者	Yi, CL (通讯作者)
发表日期	2011
ISSN	1040-6182
起始页码	65
结束页码	74
卷号	236
英文摘要	One hundred and three samples were collected from nine soil profiles in alpine meadows on glacial moraines in two valleys on the northwestern slope of the West Nyainqentanglha Mountains, central Tibet. Properties measured were soil organic carbon (SOC), soil organic matter (SOM), principal anions and cations, total nitrogen, available nitrogen, pH, water content and grain size. High concentrations of SO(4)(2-), HCO(3)(-) and Cl(-) and lack of CO(3)(2-) are consistent with the acidity of the soil: pH < 6.21. Na(+) and K(+) are concentrated at depths of 0.2-0.4 m. A high concentration of Ca(2+) in the profiles indicates that leaching is weak. Sand and pebbles are dominant in soils with low clay content. These characteristics all indicate that the soil, which began to form in late Holocene time, is not well developed. The SOM and SOC contents are closely correlated and decrease with depth. Thus. SOM determined by the simple and quick loss on ignition method (LOI) can be substituted for SOC determined by the time-consuming and expensive Walkley-Black method (WB). Both SOM and SOC decrease with depth, but in contrast to a commonly reported result, their ratio, SOM/SOC, does not increase with depth in some of our profiles. This is attributed to periglacial processes that prevent organic matter with oxygen-functional groups from moving downward in the soil profiles. Periglacial processes may also disturb the soil layers through gelifluction. Consequently organic carbon does not decrease with depth in the profiles as it commonly does in low altitude areas. This is potentially significant in understanding the degradation and development of landforms in Tibetan landscape. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.
关键词	LOSS-ON-IGNITION ORGANIC-CARBON MATTER PROFILES PLATEAU CHINA
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000290511100008
来源期刊	QUATERNARY INTERNATIONAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257841
推荐引用方式 GB/T 7714	Wang, Liqiang,Yi, Chaolu. Properties and periglacial processes in alpine meadow soils, western Nyaingentanglha Mountains, Tibet[J]. 中国科学院青藏高原研究所,2011,236.
APA	Wang, Liqiang,&Yi, Chaolu.(2011).Properties and periglacial processes in alpine meadow soils, western Nyaingentanglha Mountains, Tibet.QUATERNARY INTERNATIONAL,236.
MLA	Wang, Liqiang,et al."Properties and periglacial processes in alpine meadow soils, western Nyaingentanglha Mountains, Tibet".QUATERNARY INTERNATIONAL 236(2011).