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作 者 ：刘加珍,陈亚宁,李卫红,陈亚鹏

期 刊 ：生态学报 2004年 24卷 2期 页码：379~383

关键词：塔里木河下游；植物群落；衰退演替；物种；

Keywords:lower reaches of the Tarim River, plant communities, degraded succession, species,

摘 要 ：根据野外样方调查 ,以空间序列推断其时间序列 ,分析了塔里木河下游植物群落的结构与分布 ,并对植物群落的衰退演替及其组分种消长的动态变化进行了分析。分析结果表明 :随着塔里木河下游来水量的不断减少 ,沿河道分布的植被 ,其盖度、物种丰富度均呈递减趋势 ,且植物群落成梯度分布。随着地下水位的不断下降 ,不同物种对环境退变的忍受能力不同 ,退化的先后不同 ,退化顺序表现为浅根系的草本到深根系草本与部分灌木 ,最后衰退的是耐旱性较强的灌木与乔木。在植物群落的衰退演替过程中 ,塔里木河下游不同河段的两种植物群落 ,在优势种的更替、组分种的消长上表现出不同的衰退特征。

Abstract:The Tarim River, the longest inland river of China, runs in a specific region—the extreme dry area of the Taklimakan Desert. Natural vegetation in the Tarim River basin plays a very important role both in conservation of biodiversity and reduction of desertification. During the past 50 years, human activities related to water resource development have significantly changed natural ecological processes of the Tarim River watershed, especially the lower reaches from Daxihaizi Reservoir to Tatema Nor. In order...

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