Vegetation sustainability in relation to water resources in typical sandy areas of eastern China
When restoring or rebuilding sandy vegetation in arid areas,precipitation and shallow groundwater are two key factors in determining vegetation stability,because vegetation can only be stable and sustainable in its windbreak and sand fixation function when the water demand of vegetation,precipitation and groundwater re-plenishment are in balance.In this paper,Mu Us Sandy Land and Horqin Sandy Land,which are typical sandy lands in eastern deserts of China,were selected,and vegetation coverage data,meteorological station data,groundwater data and field survey data with continuous time phases were used,the dynamic changes of sandy moisture and the balance between vegetation water demand and water supply were calculated.The results showed:(1)Mu Us Sandy Land and Horqin Sandy Land had the highest correlation between VC during the growth season and P in the previous year and the current year,separately.The response of each grid buffer zone to groundwater is also abundant in a one-year lag and different vegetation types have different lag times in re-sponding to changes in P and groundwater.(2)The monthly vegetation water demand and average monthly W of vegetation in these two sandy areas showed an increasing trend in each growing season,with significant spatial variation;(3)The main source of water demand for vegetation in the Mu Us Sandy Land and Horqin Sandy Land is groundwater,and declining groundwater levels may causes unsustainable vegetation;the Mu Us Sandy Land is more dependent on precipitation and the Horqin Sandy Land is more sensitive to groundwaterfor natural geographic differences.(4)The vegetation stability of two sandy areas is cyclical,varying from 2-24 years de-pending on local ground conditions.
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万方数据
