孔雀河流域农业灌区土壤盐分空间分布及变异特征

为查明孔雀河流域的土壤盐分空间分布及变异特征,进而为地区盐渍化土壤改良与利用提供科学依据。在该区25个点逐层采集土壤剖面样品,测试土壤盐分含量,利用地统计学基本原理与手段,获得区内土壤盐渍化的空间变异信息参数,绘制了区域土壤盐分含量空间分布图。研究表明:0~20 cm和20~60 cm属中度盐渍土,60~100 cm属轻度盐渍土;各土层盐分含量处于强变异性范围;块基值25%,具有强空间相关性,结构性因素对其空间变异的贡献较大;土壤盐分含量存在明显的空间分布规律,水平方向上由上游至下游含盐量先增后减,随距河流距离增加含盐量缓慢增大,垂直方向随深度增加含盐量逐渐减小。

Soil Salinity Spatial Distribution and Variation Characteristics in Irrigated Land of Kongque River Basin

To find out soil salinity spatial distribution and variation characteristics of Kongque River basin,in turn to provide scientific basis for the improvement and utilization of saline soil.Collect soil samples in each layer from 25 points,test the salinity of soil,get the parameter of spatial variation characterstic by applying the methods of geostatictics,draw the map of soil salinity spatial distribution.Studies show: The layers of 0-20cm and 20-60cm are in a moderate salinization condition,the layer of 60-100cm is in a mild salinization condition.The soil salinity of each layer exhibited severe spatial variation. The nugget-to-sill ratios are smaller than 25%,so that the spatial correlations are strong,the main influence factor of spatial variation are structural factors.The soil salinity get obvious spatial distribution regularity,in the horizontal direction, increase firstly and than decrease from the upper reaches to the lower reachers,and when the distance with river increase,the salinization would increase,in the vertical direction,it reduce gradually along with the depth increase.