榆林沙区土壤水分时空格局及动态变化规律研究

Research on Temporal and Spatial Patterns and Dynamic Laws of Soil Moisture in Yulin Sand District

采用定位取样与烘干法,测定了榆林沙区几个树种土壤含水量。结果表明:各树种土壤含水量变化规律为:樟子松>柠条>紫穗槐>沙柳>沙蒿>花棒-踏郎;土壤含水量的垂直分布格局为表层土壤含水量最低,随着土壤深度的增加,土壤含水量呈增加趋势;土壤含水量的季节动态规律为不同树种土壤含水量具有明显的季节变化规律,土壤含水量按季节变化可分为3个阶段,4-5月的土壤水分弱失水阶段,6-8月的土壤水分消耗阶段,9-10月的土壤水分缓慢恢复阶段。

This article uses the localization to take a sample and to dry the law, has determined the Yulin sand district several trees soil moisture. The results are as follows., soil moisture content＇s vertical distribution pattern is lowest for the surface layer soil moisture content, along with depth of soil increase, the soil moisture content assumes increases the tendency; Soil moisture content＇s season dynamic rule has the obvious seasonal variation rule for the different tree species soil moisture content, the soil moisture content may divide into three stages according to the seasonal variation,soil moisture weak dehydration stage from April to May, soil moisture consumption stage from June to August, soil moisture restores the stage slowly from September to October; Various trees＇ soil moisture change rule for Pinus sylvestris var. mongolica〉Caragana korshinskii〉Amorpha fruticosa 〉 Salix psammophila 〉Artemisa arenaria DC. 〉Hedysarum scoparium-Hedysarum fruticosum.