Study On The Impact Of Groundwater Depth To Vegetation Ecological Water Requiremengt In Ejina Oasis

Ejina natural oasis located at the lower reaches of the Heihe River Basin, is the northwest arid area. In the recent 20 years, because the upstream area industry and agriculture occupies the ecological environment water used the aspect, caused the natural vegetation to decline, the sink lake obliteration, the land contract period and so on a series of serious consequences. In order to protect the environment, the maintenance terrestrial biota system normal development, we must guarantee that certain Vegetation Ecological Water Requiremengt to nourish biological, self-control water source adjustment free air temperature and humidity and other functions.On the basis of oasis rescue and the ecological protection to volume Ejina provides the water resources plan in Ejina river basin. planning to provide the basis for the study area in the understanding of present situation water resources and in the vegetation condition, this discusses the document following several spot main research content and the conclusion:Natural vegetation in Ejina oasis affect the analysis of environmental factors The vegetation evolution and the climate, the ground water, the soil and so on are the dynamical equilibrium.(1)With the different climate-index judgment climatic factors the influence which evolves to the natural vegetation,such as aridity, volatile grade and moist coefficient.Climatic factor to natural vegetation's influence is very difficult quantitative analysis, but it has the close relation to the subsoil water level, thus affects the natural vegetation change.(2) The Groundwater Depth is on the impact of natural vegetation, in relations of the analysis plant community growing trend and the ground water burying depth, obtains a few sections of the subsoil water level through several cross section analyses the continually drop to the natural vegetation species, cover, richness affected significantly. Computing the Vegetation Water Requiremengt in Ejina Oasis. The Computing of Vegetation Water Requiremengt in Ejina Oasis including the vegetation transpiration quantity and the diving transpiration rate. The former obtains depending on the experiment, the latter this article uses Abprbchon formula computation. This type is results in through the massive arid area field test data, conforms to the arid interior area basic condition, simultaneously it is closely related with the ground water, can reflect basically dependence ground water to maintain the ecosystem stable particularity in Ejina region.