鄂托克前旗毛乌素沙地GSPAC系统水分动态分析

Study on Water Dynamics of GSPAC System over Maowusu Sandland in Etuoke Banner

在分析地下水与土壤-植物-大气连续体GSPAC的关系基础上,系统探讨了沙地GSPAC天然植被水分系统关系,定量揭示了毛乌素沙地土壤含水率、降雨和地下水以及地下水与植被地下生物量的关系。结果表明:随着地下水埋深的增加,植被的地下生物量有明显的降低趋势;在地下水埋深小于1.8 m、降雨大于8 mm时对地下水产生不同程度影响。成果对沙地生态保护具有一定的指导作用。

Basing on the relation of Groundwater and Soil-Plant-Atmosphere-Continuous （ GSPAC）, the paper systematically analyzed the water relation of natural vegetation in GSPAC and quantitatively disclosed the relation of soil moisture content, precipitation, groundwater and the underground biomass of plants, putting forward a natural water requirement of vegetation in Maowusu Sandland. The results show that the groundwater level of experiment plot could significantly influence the soil moisture content of soil surface;The underground biomass of plants obviously tended to decline with increasing depth of groundwater level;As depth of groundwater below 1.8 m and precipitation above 8 ram, which have a different impact on the groundwater level. Those results had guiding important to protect ecological environment of sandland.