黄土丘陵区沙棘灌木林地土壤水分动态研究

Soil water dynamic of Hippophae rhamnoides in Loess Hilly Region

采用生物与工程措施相结合的方法,定位研究了沙棘林地的土壤水分变化动态。结果表明:水平阶、水平沟和鱼鳞坑整地不同立体配置模式土壤水分大幅度提高,0～2.0m沙棘与豆科牧草立体配置的土壤含水量均高于沙棘与禾本科牧草的立体配置;2.0～5.0m沙棘与禾本科牧草立体配置的土壤含水量均高于沙棘与豆科牧草的立体配置。其提高幅度为3%～5%。未采用工程整地措施的沙棘林地,在沙棘生长的第3年,土壤干层的分布深度不甚明显;从第5年土壤干层厚度逐渐加深到1.8m;第7年土壤干层厚度为2.6m;第9年土壤干层厚度为3.1m;第11年土壤干层厚度为2.6m;第13年土壤干层厚度为2.2m。

With biologic and engineering measures,soil water dynamic of Hippophae rhamnoides was studied.The results showed that soil water of various stereoscopic collocation models was enhanced.Within 0~2.0 m soil water content of Hippophae rhamnoidesLeguminosae was higher than that of Hippophae rhamnoides Gramineae,while within 2.0~5.0 m the result was opposite and it enhanced 3%~5%.Without engineering measures soil drylayer of Hippophae rhamnoides that has grown for 3 years was not obvious.The thickness of dry layer for 5,7,9,11 and 13 years was 1.8 m,2.6 m,3.1 m,2.6 m and 2.2 m respectively.