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Gansu Agricultural University (2008)

The Structure and Dynamics of Plant Communities and the Dominant Population in Minqin Desert Grassland

刘晓春

Titre : The Structure and Dynamics of Plant Communities and the Dominant Population in Minqin Desert Grassland

Auteur : 刘晓春

Grade : Doctoral Dissertation 2008

Université : Gansu Agricultural University

Résumé partiel
Minqin desert grassland is a part of Mongolian-Xinjiang plateau of Chinese grassland region,and lies in the arid desert region of lower reaches of Shiyang River,which is the result of natural succession of long-term adaptation of natural and social environment in specific circumstances.It plays a very important role in maintaining the stability of ecological environment and resisting sand hazard as well as promoting the development of grassland agriculture.So it has the extremely important significance in studying vegetation dynamic changes and characteristics of plant communities for the local eco-environment construction and socio-economic development in the region.Based on major plant communities in Minqin desert grassland,the type of major plant communities, distribution,area,habitat conditions and community characteristics were analyzed through field investigation combined with "GIS" technology methods.The main contents of this study were the type of Minqin desert grassland,plant community types and its distribution,the characteristics of plant communities’ structure (including species quantity composition,appearance,diversity,the dominant species populations and distribution pattern,etc.).Through solving age structure curve of the dominant species and a static life curve,the dynamic changes and development trends of the dominant species of plant communities was analyzed.The results were as follows :(1) According to the comprehensive and sequential classification which was founded by academician Pen Jizhou,it classifiedⅣA4- tepid and dry type(temperate desert grassland).According to the soil,terrain features,it was divided into three types of gravelly desert grassland,sandy desert grassland and saline desert grassland.(2) Gravelly desert grassland is located in erosible low hill and surrounding areas of northern Minqin.Saline desert grassland is mainly distributed in two sides of the lowest region of the West river and the East river and the ancient lake basin areas of northern Minqin ;Sandy desert grassland is distributed as strip distribution between gravelly desert grassland and Minqin oasis.The overall features of Minqin desert grassland is sparse grassland vegetation,little plant types,poor quality and low yields.A total area was 934639.8 hm 2.The gravelly desert grassland and the sandy desert grassland in Minqin mainly accounted for 39.44%and 37.66%of the total area.(3) The representative communities of Minqin desert grassland are Nitraria community, Reaumuria community,Kalidium foliatum community,Phragmites australis community, Nitraria community,Leguminose community,Zygophyllum xanthaxylum community, Caragana community,Ephedraprzewalskii community and Potaninia mongolica maxim community.The large area of community is Nitraria community,310290.20 hm 2 and is 33.20%of Minqin desert grassland ;The small area of community is Potaninia mongolica maxim community,8736.00 hm 2 and is 0.93%of Minqin desert grassland.(4) The number of features of plant community in Minqin desert grassland is a relatively small species number.The survey showed that the most species was Leguminose community and only 17 species,the least species was Phragmites australis community and only 5 species.The total plant species of Minqin desert grassland are 41 species

Mots clés : Minqin; desert grassland; plant community; population; the dominant species; the distribution pattern; species diversity; age structure;

Présentation (CNKI)

Page publiée le 9 janvier 2018