黄河源区黑土滩垂穗披碱草人工草地土壤水分动态研究

摘要

对黄河源区不同龄垂穗披碱草人工草地及黑土滩退化草地土壤水分动态进行了研究。结果表明：各样地0～20cm土层土壤含水量具有明显的季节变化规律,变化趋势总体上为先增高,后降低。人工草地7月下旬土壤含水量达到最高,黑土滩退化草地8月下旬土壤含水量达到最高。各个时期0～20cm土层土壤含水量总体上为黑土滩退化草地〉2龄人工草地〉6龄人工草地。各时期0～20cm土层土壤水分垂直变化为人工草地随土层深度的增加而减小,黑土滩退化草地总体上随土层深度的增加而增大。%Dynamics of soil moisture of Elymus Nutance artificial grassland at the different.age and black soil beach degraded grassland were studied in area of Yellow river headwater.The results showed that soil moisture variety trends at 0～20cm soil layer in different plots increased firstly,then decreased.At the last ten-day period of July,soil moisture of artificial grassland reached highest.At the last ten-day period of August,soil moisture of black soil beach degraded grassland reached highest.In different period,average soil moisture at 0～20cm showed that black soil beach degraded grassland2-year artificial grassland6-year artificial grassland.In each period.soil moisture at 0～20cm soil layar changed as verticality,with increasing of soil depth,soil moisture decreasing for artificial grassland,but soil moisture also increasing generally for black soil beach degraded grassland.