沙漠-黄土南北样带土壤物理性质区域分异特征

Change of Soil Physical Properties from Desert Area to Loess Area in China

采集了沙漠-黄土南北样带从北到南的沙漠区、过渡区、黄土区的土壤样品,测量和分析了不同区域土壤容重(D)、粒度特征。结果表明:①D沙漠区>D过渡区>D黄土区,土壤容重的平均值依次为1.53g.cm-3、1.51g.cm-3、1.41g.cm-3,过渡性明显;②沙漠区以中砂和细砂为主,过渡区以细砂为主,黄土区以细砂和粉砂为主。从沙漠区到黄土区,土壤颗粒逐渐变细,粘粒含量增加,分选性变差,偏度均属正偏,且在增大,峰态从常峰态向窄峰态类型变化,过渡区和黄土区属于双峰态,沙漠区属于单峰态。

Through collecting the soil samples from desert area,desert-loss transitional area,and loss area,which are located in a meridional desert-loess transition zone in north Loess Plateau,we analyzed the soil bulk density and grain-size.The results showed that：（1） DdesertDdesert-lossDloss,and the average soil bulk densities were 1.53 g·cm-3,1.51 g·cm-3,1.41 g·cm-3 for the three sub-areas,respectively,which had a transitional trend.（2） Medium and fine sand were higher in the desert area,fine sand was higher in the desert-loess transitional zone,while fine and silty sand were higher in the loess area.From the desert area to the loess area,the soil grain size became smaller;the content of clay particle increased;the sorting gets worse;the skewness belonged to a right skewness but having an increasing trend;the kurtosis changed from mesokurtic to leptokurtic.It was single-kurtosis in the desert area,and it is double-kurtosis in the transitional zone and loess zone.