晋西北不同植被类型土壤水分空间分异

采用土钻法对晋西北朔州地区杨树林、柳树林、草地3种植被类型0~600 cm土层土壤水分动态进行研究。结果表明:土壤平均含水量表现为草地杨树林地柳树林地。草地土壤平均含水量比杨树林地高1.25%,比柳树林地高1.9%。随着土壤深度的增加,土壤含水量先减小后上下波动,然后趋于稳定。0~100cm土层范围内,土壤水分变异系数大小为草地柳树林地杨树林地;在200~300 cm、400~500 cm土层范围内,变异系数表现为柳树林地草地杨树林地;300~400 cm、500~600 cm土层范围内,变异系数大小为柳树林地杨树林地草地。越靠近表层,土壤干化现象越严重,柳树林地干化现象最明显,含水量变化最剧烈,杨树林地次之,草地最稳定。

Study on soil moisture changes of different vegetation types of Northwestern Shanxi Province

The soil drilling can be used to do some research about 0 ~600 cm the dynamics of soils moisture,which in-volves three vegetation types of poplar forest,willow forest and grassland in Shuozhou,northwestern Shanxi Province.The results showed that the average soil moisture content is in order of grassland,poplar forest land and willow forest land.The grassland soil sample average moisture content is higher than the poplar 1.25% and 1.9% higher than the wil-low sample area.With the gradual increase in soil depth,the trend of soil moisture is first reduce then volatility last to-wards stability.The analysis results from different depth of soil moisture variation coefficient,as following.When the soil depth is about 0 ~100 cm,grassland >willow forest >poplar forest.As for the soil depth is 200 ~300 cm and 400 ~500 cm,willow fore >grassland >poplar forest.In 300 ~400 cm、500 ~600 cm,willow fore >poplar forest >grassland.The more near surface,the more serious the phenomenon of soil dry is.Among the three plants,dry layers underneath willows are the most serious one.Willow water content change is the most violent while grass is the most stable.