丹江典型小流域土壤有效铜分布规律

Distribution of Soil Available Copper in Small Typical Watershed of Danjiang River

[目的]研究丹江中游典型小流域土壤有效铜在不同土层深度、土地利用类型以及地形地貌因子下的分布规律,以期为该流域土地管理提供科学依据。[方法]应用地统计学和空间分析的方法对流域野外采样数据进行分析。[结果]（1）取样区土壤有效铜均值为0.743mg/kg,土壤有效铜含量随土层深度的增加而降低;（2）不同土地利用类型下土壤有效铜含量在0.289~2.043mg/kg之间且土壤有效铜含量总体处于较低范围;（3）不同土壤深度下土壤有效铜含量均与海拔呈负相关,而与坡度无相关性。[结论]结构性因素导致土壤有效铜分布呈现出强的空间依赖性;而施肥状况、耕作措施、种植制度等各类人为活动的影响又使得随机性因素增加,最终使得研究区域内土壤有效铜含量总体上呈带状分布格局。

[Objective]Distribution characteristics of soil available copper under different depths,land use patterns and topography factors at Danjiang River basin were studied for watershed land management.[Methods]Spatial analysis method of geostatistics was used to analyze the basin field data.[Results]（1）The mean value of soil available copper content was 0.743mg/kg and decreased with the soil depth in whole research area.（2）The value of soil available copper content was comparatively in an overall low level,ranged from 0.289~2.043mg/kg for all land use patterns.（3）Soil available copper content had negative correlation with elevation,no obvious correlation was found with slope gradient.[Conclusion]It is structural factors that led to the strong spatial dependence of soil available copper,and human activity,like fertilization,cultivation and planting,etc,was the stochastic factor.Both of them make the soil available copper content distributed in a zonal pattern.