太原东山试验林场土壤理化性质及饱和导水率的坡向分异规律研究

Slope-Aspect Driven Variation of Soil Physicochemical Properties and Saturated Hydraulic Conductivity in Dongshan Experimental Forest Farm of Taiyuan City

为了探究太原东山试验林场不同坡向条件土壤性质及饱和导水率变化的规律,选取东山林场无植被覆盖裸地和油松林地的阳坡、阴坡、半阴半阳坡共6个样地进行土壤采样,测定了土壤基本性质及养分含量,并用环刀分层取土,测定土壤饱和导水率,对比分析了土壤性质、养分及饱和导水率的坡向分异规律。结果表明:坡向对土壤密度无影响;裸地土壤含水率表现为阴坡>半阴半阳坡>阳坡;油松林地土壤含水率、土壤养分元素含量、土壤饱和导水率表现为阳坡>半阴半阳坡>阴坡,阳坡表层土壤(0—30cm)石砾含量少于其他坡向,总孔隙度高于其他坡向。坡向对土壤性质及饱和导水率的影响是通过植被产生作用。在今后对林地土壤性质及水分入渗的研究中不能忽略坡向的影响。

In order to analyze the slope-aspect driven variation of soil physicochemical properties and saturated hydraulic conductivity in Dongshan experimental forest farm of Taiyuan City,we selected sunny-slope,half-sunny slope and shady-slope in bare area and forest lands to sample soils,and the basic properties of soil and nutrient contents were measured,we used the core to take soil samples in layers,and measured the soil saturated hydraulic conductivity,explored the characteristic of soil properties,soil nutrient and saturated hydraulic conductivity of samples taken in different aspects.The results showed that the slope aspects had no effect on soil density;soil moisture in bare area decreased in the order：shady-slopehalf-sunny slopesunny-slope;soil moisture,soil nutrients and soil saturated hydraulic conductivity in forest land decreased in the order：characterized by sunny-slopehalf-sunny slopeshady-slope,sunny-slope gravel content of surface soil（0—30cm）is less than the other aspect,and its total porosity is larger than other aspect.Influence of aspect on soil properties and saturated hydraulic conductivity is indirect,which is through its effects on forest.The future research for soil properties and water infiltration in forest land should not ignore the impact of slope aspect.