Study on characteristics of vascular bundle species diversity influenced by water in the middle reaches of Tarim River
LIU Jia-zhen~(1,2) CHEN Ya-ning~2 CHEN Yong-jin~2 (1 School of Environment and Planning, Liaocheng University,Liaocheng 252059,Shandong,China;2 Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China)
The present paper is inclined to introduce our investigation and analysis of the characteristic features of the vascular bundle species diversity under the influence by the water of the middle reach- es of the Tarim River.In our investigation,we have collected sam- ples from 18 plots of the three monitoring sections in the middle reaches of the Tarim River,Xinjiang,and analyzed the environmental variables and species diversity by using diversity formula,with the help of ANOVA and regression analysis plant communities.The result of our investigation and analysis indicate that the moisture factor of the environmental variables serves as the dominant factor in deciding the distribution of species diversity.Although the moisture content of the three monitoring sections proves to be significantly different by ANOVA,the other contents of the soil factors are significantly differ- ent.Of the factors here mentioned,the water conditions of Wusiman section is better than the other two sections,while that of Shazihe section is rather poor.And,it is found that the increasing trend proves related with the variation of the richness of herbaceous plants along with the increased moisture content of soil by regression analy- sis.At the same time,the trends would decrease with the increase of the groundwater depth.However,significant variation of the richness cannot be found in the woody with the changes on the environmental factors from our regression analysis.In addition,many species in the middle reaches of the river were photophilous,with the drastic inter- species competitions in the given environments that were provided with high groundwater level,at which some herbs can simply be hard to make their survival due to dense coverage of some shrubs.Howev- er,at the same section of the river,not significant distribution gap was found in the area with better moisture condition near the stream channel than in the other ordinary areas.As a result of investigation, we have found that 16 species of the total 23 plant species belong to herbs.That is to say,the richness of herbs may perhaps directly in- fluence the richness of the plant community.Comparing the distribu- tion of species diversities of the three sections in a distance 100 me- ters' away from the river bank areas,it can be found that the combi- nation of high species richness and low evenness would be character- istic of the plant communities in the Wusiman section,while the in- verse combination of species richness and evenness can be found in the Shazihe section.
【Fund】： 中国科学院知识创新项目(KZCX2-YW-127；KZCX-XB2-03);; 国家自然科学基金项目(90502004；30500081)
【CateGory Index】： Q948
【CateGory Index】： Q948