The Research On The Effects Of Daliyabo By Oasis Soil Environmental Factors On Plant Communities

Study the western desert oasis vegetation in arid areas of plant resourceutilization and improve the fragile ecological environment in xinjiang has a veryimportant role. In this context, this article selects the desert hinterland of thetaklimakan desert is located in the extremely drought in the Daliyaboyi oasis research,mainly in the early stage of the research of remote sensing images, topographic maps,and on the basis of field work, selection and layout samples and sample point in thestudy area, through the field investigation and indoor experiment analysis terrain,river, soil physical and chemical data in the study area and main desert vegetationcommunity characteristic data. For soil data gained by the use of voronoi, classicalstatistics and statistical methods in preliminary statistical analysis, analysis of soilphysical and chemical properties in the study area include: soil bulk density, soilmoisture content, PH value, total salinity and salt type, reaction degree and desertvegetation community features include: plant height, crown breadth, plant density,vegetation coverage, biomass and other characteristics and spatial distribution pattern,and using correlation analysis to find out the relationship between them. Research inthe Daliyaboyi oasis vegetation distribution and restriction factor, plant protection andecological restoration in this area to provide certain theoretical basis.The main topics of this thesis are as follows: the river is in the Po in accordancewith the oasis important environmental factor, the distance from the river near to thefar space of community distribution of reed (0-200-m), tamarisk community(200-800-m) and three types of p. euphratica community (800-1700-m); Differentplant communities from river near and far and negatively correlated with vegetationcoverage and biomass; The same vegetation community far from river, the vegetationof the crown, physical characteristics such as height, diameter at breast height, plantbundle number the less, the worse they are growing. Landscape characteristics ofvegetation community also has a certain influence, study OuDeWei geomorphic maximum elevation180m, with declining terrain, vegetation coverage is on the rise,while plant species number shows the tendency of decline. Soil moisture content andsoil bulk density is arid and semi-arid areas of vegetation community features one ofthe most important factor. Degree of the soil salinization in the study area is mainly inthe scope of the mild salinization to moderate salinization has minor to severesalinization area, severe salinization of most types of sulfate-salt chloride type,medium saline area for chloride, sulfate, and mild salinization of soil for sulfate type.With the increase of soil PH plants are high and coverage to render a from low to highand low to high, the curve characteristic; Presents the increasing trend overall plantspecies, plant density reduced after first increases, the growth of halophytes toalkaline environment, with the increase of PH, reproduction and growthcharacteristics of halophytes. Soil alkalization degrees within the range of27.7%to15.0%for plant growth and good; Alkalization degree and negatively correlated withplant coverage and plant species overall; Basic stable soil alkalization degrees andplant species, the relationship between a little change, soil alkalization degrees andparabolic distribution to the plant density.Daliyaboyi oasis ecological environment deterioration, the vegetation in the studyarea a large number of dead or damaged, in particular the Euphrates poplar, tamariskperformance is most obvious, a shrinking oasis area, unreasonable human lifeactivities is the main factor that leads to its degradation, such as a hierarchical largeamounts of water, middle and lower reaches of overgrazing, deforestation, etc, forcingkerry luhya continually migration to river shelter-forest region.