大武地区黑土滩人工草地土壤水分动态研究

Study on Soil Moisture Dynamics in Black Soil Beach Artificial Grassland of Dawu Region

对大武地区不同龄青海草地早熟禾人工草地和原生植被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月底土壤含水量达到最高，原生植被9月下旬土壤含水量达到最高。各个时期土壤各层及平均含水量均为原生植被〉5龄人工草地〉4龄人工草地。各样地0—20cm土壤水分垂直变化具有相同的趋势，即随土层深度的增加而减小。

The soil moisture dynamics in the artificail grassland of Poa pratensis cv Qinghai at different age and native vegetation of Dawu region was studied, The results showed that there was an obvious change law with season in the soil moisture of various plots collected sample at 0 - 20cm soil layer. Overall, the change tendency was firstly increased, then decreased overall. At the end of July, the soil moisture in artifiial grassland reached the highest and at the last tenday period of september, the soil moisture in native Vegetation reached the highest. In defferent period ,the average soil moisture in native vegetation was the highest in defferent soil layer, and was the artificial grassland at the age of five years in the next place, and the soil moisture in the artificial grassland at the age of ftour years was the lowest. There was the same vertical change tendency in the soil moisture at 0 - 20cm soil layer in the Various plots collected sample that the soil moisture was decreasing with increasing of soil depth.