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一、前言草原牧草蒸腾和地面蒸发所需的水分主要来自土壤。土壤水分因不断蒸散而减少,也因大气降水蓄积在土壤之中,使土壤含水量不断得到补充。土壤水分就是在这样地增耗之中保持其含量的相对稳定
I. INTRODUCTION The water required for grassland transpiration and ground evaporation is mainly from soil. Soil moisture is reduced due to continuous evapotranspiration, but also due to the accumulation of atmospheric precipitation in the soil, so that the soil moisture is constantly being supplemented. Soil moisture is in such a way to maintain the relative stability of its content