辽西北风沙地土壤抗蚀性及其与力学性质关系

Soil Erosion Resistance in Wind-sand Land and Its Relationship with Mechanical Properties in Northwestern of Liaoning Province

通过探究风沙土的土壤抗蚀性特征及其与土壤力学性质的关系,以辽西北风沙地的樟子松林地、大扁杏林地(果园)、荒草地、花生地共计四种典型土地利用方式下的风沙土为研究对象。采用野外取样与室内指标测定相结合的方法获取土壤特性和根系特性信息,采用主成分分析与相关性分析等方法研究了不同土地利用方式下的土壤抗蚀性强弱及其与力学性质关系。结果表明:辽西北风沙地不同土地利用方式下的土壤容重表现为花生地>樟子松林地>荒草地>大扁杏林地(果园),而有机质则表现相反的变化趋势,土壤饱和含水量与毛管持水量随土层深度的增加而减小;土壤的综合抗蚀性表现为花生地(5.30)得分最高,其次是樟子松林地(4.33)和荒草地(4.27),大扁杏林地(果园)(3.51)得分最低,不同土地利用方式的土壤抗蚀性随土层深度的增加而减小;不同土地利用方式土壤黏聚力表为花生地最大,内摩擦角除大扁杏林地(果园)的较小外,其他土地利用方式的内摩擦角差异不大,土壤平均休止角表现为花生地>樟子松林地>荒草地>大扁杏林地(果园),土壤黏聚力、土壤内摩擦角和土壤休止角与土壤抗蚀性之间存在正相关关系,其中休止角与土壤抗蚀性呈显著的正相关关系,土壤的力学性质也是影响土壤抗蚀性的重要因素。

To explore the sand soil resistance to erosion of soil characteristics and its relationship with soil mechanics,in Northwestern of Liaoning Province wind-sand land Scotch pine forest land,Prunus armeniaca Linn forest land(orchard),grass land,peanut field a total of four kinds of typical land use mode of sand soil as the research object,by adopting the combination of field sampling and indoor index determination method for soil and root characteristic information,the methods of principal component analysis and correlation analysis was studied under different land use ways of corrosion resistance of soil strength and its relationship with mechanical properties.The results showed that the soil bulk density in Northwestern of Liaoning Province wind-sand land under different land use patterns was peanut field>Scotch pine forest land>grass land>Linn forest land(orchard),while the organic matter showed the opposite change trend,the soil saturated water content and capillary water holding capacity decreased with the increase of soil depth.The comprehensive corrosion resistance of soil was the highest in peanut field(5.30),followed by Scotch pine forest land(4.33)and grass land(4.27),and the lowest in Prunus armeniaca Linn forest land(orchard)(3.51).Different ways of land use soil cohesion of table for peanut field biggest,Angle of internal friction,besides Prunus armeniaca Linn forest land(orchard)of smaller Angle of internal friction of other ways of land use difference is not large,the average soil Angle of repose of peanut field>Scotch pine forest land>grass land>Prunus armeniaca Linn forest land(orchard),soil cohesion,internal friction Angle of soil and soil Angle of repose and that there was a positive correlation between the soil resistance to erosion corrosion resistance of the Angle of repose and the soil was significantly positive correlation,the mechanical properties of the soil is also the important factors influencing the corrosion resistance of soil.