摘要
[目的]研究毛乌素沙地不同地貌下沙柳（Salix psammophila）根系分布特征,揭示干旱地区不同地貌下植物适应机理。[方法]利用中子水分仪观测沙丘上和丘间洼地沙柳样地的土壤水分动态,采用挖掘法分别对沙丘和丘间洼地上的沙柳样地进行根系分布的调查研究。[结果]在水平方向上,沙丘上沙柳根量呈指数函数减少;丘间洼地的沙柳根量呈乘幂函数减少。在垂直方向上,沙丘上的沙柳根系主要分布在0~30和80~120 cm的土层范围内,根量占总根量的72%;丘间洼地上的沙柳根系主要分布在0~40 cm的土层范围内,根量占总根量的54%。[结论]沙丘上沙柳根系不仅利用表层土壤水,而且还利用中层地下水。丘间洼地沙柳根系则以利用表层土壤水为主。
[Objective] In order to study plant adaptation mechanism under different landforms in drought regions.[Method] Observe soil moisture dynamic of Salix psammophila sample areas on the dune and depression with neutron moisture gauge and research the roots distribution of Salix psammophila sample areas on the dune and depression respectively by digging method.[Result] The quantity of Salix psammophila roots on the dune exponentially decreases while that on the depression decreases by power function in horizontal direction.In vertical direction,Salix psammophila roots on the dune are mainly distributed in 0-30 cm and 80-120 cm layers as 72% of all,while Salix psammophila roots on the depression are mainly distributed in 0-40 cm layers as 54% of all.[Conclusion] Salix psammophila roots on the dune not only use surface soil water but also use middle-layer groundwater.Salix psammophila roots on the depression primarily use surface soil water.
出处
《安徽农业科学》
CAS
北大核心
2011年第25期15582-15583,15607,共3页
Journal of Anhui Agricultural Sciences
基金
教育部科学技术研究重大项目(308021)
国土资源部公益性行业科研项目(200911004)
关键词
毛乌素沙地
挖掘法
土壤水分
根系分布
Mu Us Desert
Digging method
Soil moisture
Roots distribution
