干旱区生态环境知识资源中心(Arid): 荒漠河岸生态系统退化与物种多样性恢复研究

Arid

	荒漠河岸生态系统退化与物种多样性恢复研究
其他题名	Degeneration and Restoration of Species Diversity of a Desert Riparian Ecosystem
	刘加珍 1; 李卫红1 ; 吴纯渊 2; 陈永金 1
ISSN	1001-4675
出版年	2009
卷号	26 期号:2 页码:212-220
中文摘要	通过塔里木河下游生态输水后植物群落及其环境因子的调查,采用聚类分析与多样性指数,分析生态系统退化程度与时空维上物种的恢复速率差异.结果表明:塔里木河下游生态退化可以归为3类,轻度退化、中度退化、重度退化.3种退化类型的地下水埋深依次增大,物种多样性与植被盖度依次减小,沙漠化指数也依次增强.物种多样性差异与环境水分条件有着密切的关系,在地下水埋深小于5 m时,物种恢复速率的发生率达100%,而在地下水埋深大于5 m时,多样性恢复速率达46%.根据退化程度的不同与物种多样性的恢复差异,提出该区域的生态恢复应分阶段进行.
英文摘要	The Tarim River,which is the longest continental river in China,flows through an extremely arid area,the Taklimakan Desert.Natural vegetation in the Tarim River Basin plays a very important role in conservation of biodiversity and reduction of desertification.In the last 50 years,natural ecological processes in the Tarim River Basin have changed significantly in response to human activities related to the exploitation and utilization of water resources,especially in the lower reaches from the Daxihaizi Reservoir to Taitema Lake.To determine the degree of degradation and restoration of species diversity that has occurred,8 representative sections,42 plant plots and 16 plant species were selected along the river channel between Daxihaizi Reservoir and Taitema Lake.A data matrix of environmental factors was then derived based on these sections.Monitoring of plant communities and environmental factors since implementation of the ecological water conveyance project in 2 000 was then conducted to evaluate the degree of ecological degeneration and spatiotemporal improvement that has occurred in the biodiversity of the lower reaches of the Tarim River.The results show that the degenerated ecosystem in the study area can be divided into three types using cluster analysis,slight,moderate and seriously degenerated areas.The slight degeneration of ecosystem occurs along the upper section of the lower reaches of the river,where there is a relatively shallow groundwater depth and high biodiversity index and vegetation coverage.Serious degeneration of the ecosystem can be found in the area near Taitema Lake,where the groundwater level is deeper than 10 m and there are only a few plant species.Moderate degeneration of the ecosystem occurs along the river section between these two areas.Groundwater depth is the most important factor affecting changes in biodiversity during the process of ecological restoration.When groundwater depth is shallower than 5 m,the possibility of species restoration is as high as 100%,while it is only 46% when the groundwater level is deeper than 5 m.Taken together,these results suggest that degraded ecosystems in the region should be degenerated in a stepwise fashion.
中文关键词	生态输水 ; 物种多样性 ; 植被盖度 ; 环境因子 ; 聚类分析 ; 塔里木河
英文关键词	degeneration degree ecological regeneration species restoration the Tarim River
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:3657520
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223597
作者单位	1.中国科学院新疆生态与地理研究所, 中国科学院绿洲生态与荒漠环境重点实验室, 乌鲁木齐, 新疆 830011, 中国; 2.新疆教育学院,人文科学分院旅游系, 乌鲁木齐, 新疆 830043, 中国
推荐引用方式 GB/T 7714	刘加珍,李卫红,吴纯渊,等. 荒漠河岸生态系统退化与物种多样性恢复研究[J]. 中国科学院新疆生态与地理研究所,2009,26(2):212-220.
APA	刘加珍,李卫红,吴纯渊,&陈永金.(2009).荒漠河岸生态系统退化与物种多样性恢复研究.,26(2),212-220.
MLA	刘加珍,et al."荒漠河岸生态系统退化与物种多样性恢复研究".26.2(2009):212-220.