坝上高原林草地表层土壤含水量对比研究

Comparative study on surface soil water content of woodlandand grassland on Bashang plateau

以地处半干旱坝上高原沽源县为例,对比分析不同自然区域内林地、草地距地表约25cm处土壤含水量。结果表明:人工乔木林地土壤含水量最少,灌木林地次之,草地最多,尤其是天然草地。结合当地农户走访和野外踏查,得出结论:草地或灌木林地能够较好地保持土壤水分,乔木林地则相对较差。建议遵循当地自然地带性规律,充分考虑水分条件,林草植被建设以生态耗水量少的草、灌为主,乔木为辅。

Guyuan County in northern of Hebei Province was selected as the study area to study the soil water content in typical woodland and grassland which neighboring each other.Three-points-mixed sampling method was used to collect soil samples in about 25cm depth,then the percentage of soil water content was calculated and analyzed.The purpose is to compare the soil water content in different woodland and grassland.The results shows that on the whole,the soil water content of artificial arbor land（Populus and Ulmus） is the least,followed by shrub land,and the soil moisture in grassland,especially natural grassland is the most.Combined with visiting local farmers and investigating field sites,the researchers make the conclusions as follows： both the grassland and shrub land are better able to conserve soil moisture and protect water resources;soil water conservation capacity of artificial arbors land is relatively poor;People should follow the law of local natural areas,the construction of returning farmland to woodland and grassland should mainly by grassland and shrub land,supplemented by artificial arbors land.