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Université du Xinjiang (2017)

Effects of Condensed Water on Characteristics and Stability of Desert Plant Communities

王恒方;

Titre : Effects of Condensed Water on Characteristics and Stability of Desert Plant Communities

Auteur : 王恒方;

Grade : Master’s Theses 2017

Université : Université du Xinjiang

Résumé
The condensed water is one of the sources of water in Northwest Arid and semi arid to indispensable important ecosystems,is of great significance in the ecological balance and ecological water circulation system,but also the stability of growth,reproduction and communities in the arid desert area vegetation has important significance.In this paper,the Ebinur Lake National Nature Reserve as the research object,in the Ebinur Lake area and is not affected by the influence of the Ebinur Lake affected zone as the boundary,and the condensed water subsidence as the gradient,we selected four different habitats perpendicular to the shore,field investigation,stability and determination of sample diversity and community.Simultaneous determination of condensate and condensate settlement duration,and the observation of plant water use characteristics,meteorological factors affecting the condensation of water,condensed water to explore the impact of community stability.The main results are as follows :(1)According to the EM50 observation of the condensed water results,four samples of surface soil condensate(0-3 cm)there is a significant difference between the performance of the sample one> sample two> sample three> sample four,3-6 cm soil condensate as follows : sample one> sample three> sample four> sample two,6-9 cm,soil condensate as sample two> sample three> sample one> sample four.And the four setting plots showed daily variation curve trend in Shuangfeng.The results showed that the condensation water of the one plots and plots of land was significantly higher than that of the sample plots and sample plots of four,and there was no significant difference in the total amount of condensation water between the sample plots and the plots of land in the sample plots of one and in the sample plots of the area of the canopy in the area of and the sample plots in the area of the canopy condensation water of plots two.(2)From sample one to four kind of dominant species of Populus euphratica important value decreases,the important value of Haloxylon ammodendron in plot one and plot three large sample two and sample four smaller,Kalidium is reduced gradually,on the ground one to Salsola plots of three large sample four when its important value decreases.Four kind of diversity index H showed : sample one> sample four> sample two> sample three,Simpson dominance index showed : sample three> sample two> sample four> sample one,richness index S showed : sample three> sample one> sample two> sample four.The index of J showed : sample one> sample four> sample two> sample three.(3)The water potential of the trees in the plots of the four plots were as follows : the sample plot was the same as that of the sample plot three and the sample plot,respectively,in the order of condensation water in the sample area two,there was condensation water.

Mots clés : condensed water; arid area; stability; functional diversity; water use characteristics; community characteristics;

Présentation (CNKI)

Page publiée le 8 février 2018