关键词: 灌溉方式, 绿洲, 数值模拟

Abstract: Irrigation is the fundamentality of oasis agriculture in desert region.There is no agriculture when no irrigation.Influence of different irrigation methods on oasis soil moisture,underground runoff,sensible heat flux and latent heat flux is simulated using NCAR non-hydrostatic mesoscale model(MM5V3).The results are as follows:(1) The evaporation and transpiration were larger after ground irrigation,which will speed up the loss of soil moisture content;In contrary,spring irrigation can restrain evaporation and transpiration,this is helpful for soil moisture content maintenance.(2) Underground runoff does not form until the soil reach saturation during spring irrigation;while it forms and increases with soil moisture increasing at the same time during ground irrigation.In short,spring irrigation is an effective and water-saving irrigation method.It can cut down the temperature near the surface in the oasis ecosystem,keep not only the soil moisture but also the relative humidity higher in ecosystem,restrain the loss of soil moisture content and maintain the development of oasis agriculture.

Key words: irrigation, oasis, numerical simulation