乌鲁木齐市城市化梯度带土壤粒度分布差异性研究

Study on the Difference in Soil Particle Size Distribution along Urbanization Gradient in Urumqi

从新疆乌鲁木齐市城市化梯度带共采集88个表层(0 cm~20 cm)土壤样品,利用激光衍射技术测定土壤粒度组成,采用分形维数(Dv)、平均粒径(MG)、分选系数(σG)、偏度(SKG)和峰态(KG)等参数对比分析不同梯度带土壤粒度分布特征及各粒度参数之间的关系。结果表明:研究区乡村土壤粒度组成最粗,荒地土壤粒度组成最细;各梯度带土壤平均Dv值从大到小依次为荒地>郊区>城区>乡村;各梯度带表层土壤σG值均> 4.0,分选性均属于极差水平;土壤Dv和MG值能反映不同梯度带表层土壤粒度分布特征;各梯度带土壤Dv值的大小受土壤粒度组成的影响作用强烈,其中土壤黏粒含量起主导作用。

A total of 88 topsoil(0 cm~20 cm)samples were collected along urbanization gradient zones in Urumqi,Xinjiang,the composition of soil particle size was determined using laser diffraction technology.The distribution characteristics of soil particle size on different gradient zones and the relationship between particle size parameters were analyzed using fractal dimension(D v),average particle size(M G),sorting coefficient(σG),skewness(SK G)and kurtosis(K G).The results indicated that the particle size composition of rural soil in the study area was the coarsest,while that of wasteland soil was the finer.The average of D v of soil in each gradient zone was in the order of wasteland>suburban>urban>rural.TheσG of topsoil in each gradient zone was greater than 4.0,and the sorting ability was at extremely poor level.D v and M G of soil could reflect the distribution characteristics of topsoil particle size in different gradient zones.The D v of soil in each gradient zone was greatly affected by the composition of soil particle size,and soil clay content played a dominant role.