Effects Of Condensed Water On Characteristics And Stability Of Desert Plant Communities

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.This indicated that the condensation water can enhance the tree leaf water potential.Tree group,condensation water can improve the photosynthetic rate of one samples of about three times,samples two can improve the photosynthetic rate of about three samples can improve the photosynthetic rate of about 12.91%,can improve the photosynthetic rate of sample four times;shrub group,condensation water can be improved to one of the photosynthetic rate of 59.10%,can improve 55.02% of the photosynthetic rate of sample two,sample three can improve the photosynthetic rate of two times,can improve the sample four photosynthetic rate 79.50%;herb group,condensation water can improve two times of the photosynthetic rate of sample one,sample two can improve the photosynthetic rate of about one times,can improve the sample three the photosynthetic rate of 42.44%,net photosynthesis can improve the photosynthetic rate of the 45.04% in sample four.In the trees,the water use efficiency of sample one to sample four plots showed that the condensation water was greater than that of the non condensing water,and the sample size of the sample land in the area of four showed that the condensation water was less than that without the condensation water.In shrub,the water use efficiency of the sample one to four were all more than that of the non condensing water treatment,and the performance of the sample land in the area of three showed that the condensation water was less than that of the non condensed water.In the herb,the water use efficiency of sample plot one was greater than that of no condensation water,and the water use efficiency of the sample one sample four were less than that of the non condensing water.The results indicated that the ecological effect of condensed water on trees and shrubs was higher than that of herb.(4)The four kind of soil condensate as a whole canopy and air relative humidity had significant correlation or very significant correlation,four plots of soil condensation water and canopy condensation water and atmospheric temperature on the whole positive correlation.The soil water content and canopy condensation of four samples were negatively correlated with wind speed(5)From the stability analysis results,the stability of the plots one closer to 20/80 than relatively stable order of sample one> sample two> sample three> sample four.May be the kind of condensation water is sufficient,soil and environmental factors for plant survival,community diversity and richness,its high stability.The plots four for clean sand,only a small number of xerophytes especially competitive herbs live here,so the most vulnerable to environmental change,the stability of the lowest.