Species quantity change and ecosystem dynamics in the lower reaches of Tarim River

Abstract

Abstract: Species diversity is biological diversity of species and its aggregation.The core of species diversity research is quantity change and biological diversity degree.This paper used Simpson index,McIntosh index and Margalef index to calculate the species diversity index in Yingsu,Abudale,Kaerdayi,Alagan,and Yiganbujima with data collected from the field.The species diversity and relationship between species diversity and ecosystem stability were analyzed in the degradating ecosystem of arid region.The results showed that the ecosystem is deteriorating,with Simpson index changed from 0.82 to 0.26,McIntosh index changed from 0.60 to 0.18,Margalef index changed from 1.47 to 0.38 and the mount of species changed from 9 to 2.The degenerative character,succession dynamics and stability of ecosystem were discussed according to these data at lower reaches of Tarim River.Two features were obvions in the process of degradation at the lower reaches of Tarim River: a)Vegetation community lost its ecosystem functions;b) Water factor had dominant effect in the degradation process.

Key words: Oryza sativa, Free-air CO₂ enrichment (FACE), Phosphorus uptake, Phosphorus distribution, Phosphorus efficiency

CLC Number:

Q145

ZHANG Hongfeng, CHEN Yaning, CHEN Yapeng, LI Weihong. Species quantity change and ecosystem dynamics in the lower reaches of Tarim River[J]. cje, 2004, (4): 21-24.

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