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	Influence of land cover changes on the physical and chemical properties of alpine meadow soil
	Wang, GX; Cheng, GD; Shen, YP; Qian, J
刊名	CHINESE SCIENCE BULLETIN
	2003
卷号	48期号:2页码:118-124
关键词	land cover change alpine meadow soil soil property grassland degradation Qinghai-Tibetan Plateau
ISSN号	1001-6538
通讯作者	Wang, GX()
英文摘要	Taking the alpine cold meadow grassland in the southeastern part of the Qinghai-Tibetan Plateau as an example, this research deals with the characteristics of alpine meadow soil property changes, including soil nutrients, soil physical properties and soil moisture content under different land coverage conditions. With the degradation of grassland vegetation and the decline of vegetation coverage, soil compactness reduces, gravel content increases and bulk density increases. The originally dense root-system layer is gradually denuded, making the soil coarse and gravel. The change of the organic matter contents with the vegetation coverage change in the surface soil layer (0-20 cm) has shown an obvious cubic polynomial curve process. The organic matter contents increase rapidly when land coverage is above 60%, contrarily decreases on a large scale when land coverage is below 30%. Between 30%-60% of land coverage the organic matter contents remain stable. The total N and organic matter contents in soil have shown quite similar change regularity. Following this the mathematic equations are derived to describe such change processes. Moisture content in soil changes sharply with the vegetation coverage change. Soil moisture content change with the vegetation coverage change has shown a quadratic parabola process. Results have shown that organic matter content and the total N content of the alpine meadow soil decrease by 14890 kg/hm(2) and 2 5505 kg/hm(2) respectively as the vegetation coverage reduces from 90% to less than 30%. The heavy changes of soil physical and chemical properties with grassland degradation have made the recovery of alpine meadow ecological system impossible. The protection of alpine meadow vegetation is of vital importance to the maintenance of the regional soil environment and the regional ecological system.
收录类别	SCI
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000181243500003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556859
专题	寒区旱区环境与工程研究所
通讯作者	Wang, GX
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China 2.Lanzhou Univ, Sch Resources & Environm, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Wang, GX,Cheng, GD,Shen, YP,et al. Influence of land cover changes on the physical and chemical properties of alpine meadow soil[J]. CHINESE SCIENCE BULLETIN,2003,48(2):118-124.
APA	Wang, GX,Cheng, GD,Shen, YP,&Qian, J.(2003).Influence of land cover changes on the physical and chemical properties of alpine meadow soil.CHINESE SCIENCE BULLETIN,48(2),118-124.
MLA	Wang, GX,et al."Influence of land cover changes on the physical and chemical properties of alpine meadow soil".CHINESE SCIENCE BULLETIN 48.2(2003):118-124.

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