摘要
依据塔里木河下游7个监测断面36眼地下水位观测井和36个植物样地野外采集的数据,应用Margalef丰富度指数、Shannon-Weiner信息指数、Alatalo均匀度指数和修正的Simpson多样性指数以及含参数的Hill指数,对塔里木河下游物种多样性特征进行了分析。结果表明:塔里木河下游物种多样性与地下水埋深有显著的关联性,随着地下水埋深增大,塔里木河下游物种丰富度和多样性均表现出递减趋势,而均匀度指数的变化趋势则不甚明显;Hill指数的分析表明,以地下水埋深6m和10m为界,多样性变化明显分为3个不同的变化阶段,其中地下水埋深在6m以下时,多样性锐减,且曲线最终趋于平直。综合野外调查和样地资料分析,认为塔里木河下游物种多样性受损的临界地下水位为6m左右。
Based on the monitoring data of 36 groundwater-monitoring wells and vegetation plots in the lower reaches of the Tarim river from 2004 to 2006, the characteristics of species diversity was analyzed by using the formulas of Margalef' s richness indices, Shannon-Weiner's indices, Atalato's evenness indices, correctional Simpson's indices and the Hill indices. The results showed that the species diversity is closely related to the groundwater table and the groundwater plays a dominant role in the species diversity in the lower reaches of Tarim river. Along with the increase of groundwater depth from the upper reaches to the lower reaches of the monitoring sections of the Tarim River, the plant species become less, the structure of plant communities becomes simpler, and both the diversity and richness index of the species are in an obvious decrease status. The evenness indices, however, didn't show the same change trend. The Hill species diversity indices showed that the species diversity has distinct changing characteristics at the groundwater depth among 2 --6m,6 -- 10m and 〉 10m. Once the depth of groundwater lower than 6 meter, the diversity values become small and the trend of diversity curve becomes smooth. Combining the field investigation and the analysis of the plots, it is considered that the critical groundwater depth for the damaged species diversity is about 6 meter in the lower reaches of the Tarim River.
出处
《生态学报》
CAS
CSCD
北大核心
2007年第10期4106-4112,共7页
Acta Ecologica Sinica
基金
中国科学院西部行动计划资助项目(KZCX2-XB2-03)
中国科学院重要方向资助项目(KZCX2-YW-127)
国家自然科学基金资助项目(90502004
40671014)~~
关键词
物种多样性
地下水埋深
环境梯度
塔里木河下游
species diversity
groundwater depth
environmental gradient
the lower reaches of the Tarim River