根系对灌丛化草地土壤大孔隙形成及水分运移的影响

By means of the methods of soil profile observation, dying tracer and X-ray computed tomography, we select the Caragana microphylla encroached grassland as study area to investigate morphology and spatial distribution pattern of shrub root and soil macropores as well as preferential flow and soil hydrological parameters, then we analyze the interactions between them and reveal the mechanism of the effects of shrub roots on soil macropore formation and water flow in the soil. This study would help us have a better understanding of ecohydrological mechanism of shrub encroachment and provide scientific implicaitons for grassland management.

选择内蒙古小叶锦鸡儿灌丛化草地，采用野外剖面观测、水分运移染色示踪和CT扫描的方法，测定小叶锦鸡儿灌丛根系和土壤大孔隙的形态和空间分布格局，分析根系空间结构对土壤大孔隙分布的影响；观测灌丛根系对土壤优势流和土壤水文参数的影响，揭示灌丛对土壤大孔隙形成及水分运移的影响机理。研究结果对于理解灌丛化生态水文机理与草原治理具有重要科学意义。

选择内蒙古小叶锦鸡儿灌丛化草地，采用野外剖面观测、水分运移染色示踪和CT 扫描的方法，测定小叶锦鸡儿灌丛根系和土壤大孔隙的形态和空间分布格局，分析根系空间结构对土壤大孔隙分布的影响；观测灌丛根系对土壤优势流和土壤水文参数的影响，揭示灌丛对土壤大孔隙形成及水分运移的影响机理。研究结果对于理解灌丛化生态水文机理与草原治理具有重要科学意义。