Study On Natural Vegetation And Soil Salt Of Typical Area In Yutian Oasis

Soil salinization is one of the main types land degradation in the world, and it is a global resource issue and an ecological problem. Xinjiang is the most seriously damaged area by salinization and desertification. Arising and eveloping of salinization has become one of the important factors that effect the sustainable development of resources, environment and socio-economics of the salinized land in Xinjiang, especially in South Xinjiang. In this paper,auther chose the Karki village in the western part of Yutian(Keriya) oasis in the Southern area of Tarim River to be the study area,chose the 38 natural vegetation samples which is less suffered by human factors to be the study object, based on the collection of data in the field and the measuring of data in the laboratory, primarily by the number of sorting and classification study of the traditional ecology method describe the detection of vegetation and the relationship between environmental factors,and on this basis, use the classical statistical theory and methods,Oasis for the different fields of plant formations and soil salt-ion-related statistical analysis and comparison of eigenvalues,analyzed the data by using EXCLE and SPSS16.0,according to the differences between terrain features, geomorphic features ,plant type and vegetation coverage of various sample points, devided all the sample points into different six groups, they are :Reed group,Reed+Tamarix group,Populus euphratica group, Tamarix group, Bareland and dead Tamarix. Through analysing the main conclusions received by this research, auther summarized the following results:1. According to the classification criterion of soil salinization, it ia concluded that The study area come to the natural vegetation which is selected areas of the samples the degree of salinity is more serious, One special emphasis on saline soil and saline soil as high as 59.4%; according to the Classified soil salinity, it is discovered that the main salt types of the study area is chlorinate-sulfate.2.According to the differences between terrain features, geomorphic features and vegetation coverage of various sample points, auther concluded that the saline soil in this area has 5 main types ,they are : meadow saline soil,typical saline soil,marshes saline soil,diluvial saline soil,residual saline soil.3. Through analyzing the differences between geomorphic features,plant type and vegetation coverage of various sample points, devided them into six vegetation groups. Comparetively analyzing these different vegetation groups with its soil salinity, obtained the following results:â‘ Soil contents of different vegetation groups in different soil level are effected by vegetation types. The total salt content of bare land is the largest among all the profiles;â‘¡The difference between different soluble salt in different profiles is quite large, and these different soluble salts perform differently.The correlation is small between HCO₃^-,CO₃^2-,Ca²⁺ ion content and plant formations. SO₄^2- is the biggest in reed community,Cl-is the biggest in the saline。pHis bigger than 8,dead tamaricaceae is the biggest,populus community is the smallest。③T he main type of soil salt of the Reed and the dead Tamarix group is sodium-sulfate,the type of soil salt of other vegetation group are chloride.4.Through analyzing statistically the soil salinity of typical vegetation(Reed),obtained the following results:â‘ The variability of Cl^- and Na⁺+K⁺ in different soil level of each profile is large, but the variability of pH value of all these profiles are weak, the other ions show middle variability.â‘¡Correlation between total salt, various salt ions and pH value shows that:the correlation between total salt and SO₄^2-,Na⁺+K⁺and HCO₃^- is significant; the correlation between Cl^- and K⁺+Na⁺ is the most significant. The soil salinity of Reed group mainly consists of sodium-chloride.