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。
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 Rese...
出处
《干旱区研究》
CSCD
北大核心
2009年第2期212-220,共9页
Arid Zone Research
基金
国家自然科学基金(90502004,40871059,40871239)资助
