泥河沟小流域土壤养分的分布与保护

Distribution and Protection of Soil Nutrients in Nihegou Small Watershed

以淳化县泥河沟流域为对象 ,通过不同时期土壤样品的分析以及径流小区资料的统计 ,得出该流域土壤养分具有明显的空间分布规律 ;从分水岭到沟缘 ,土壤肥力呈衰减趋势 ,沟谷地向沟床呈增大的变化趋势 ,其主要是水土流失的结果。因此 ,进行水土流失综合治理、坡耕地覆膜套种等是保护与恢复土壤肥力的有效途径。

Taking the Nihegou small watershed in Chunhua county as an study object, through testing the soil samples in different times and data statistics from the small runoff region, it was known that there was a clear space distribution law of the soil nutrients variation in the region. Mostly because of water and soil loss the soil fertility became declining from watershed to the edge of gully, and the area was enlarging from gully valley to riverbed. Therefore it is the effective way to protection and recovery soil fertility through comprehensive controlling soil erosion and mulching with film and interplanting in the sloping farmland.