清水县耕层土壤主要养分空间分布与变异研究

Spatial distribution and variation of the main topsoil nutrients in Qingshui County

基于ArcGIS软件的应用模块和地统计学方法,根据2008年清水县测土配方施肥项目的采样数据和地力评价项目的图件资料,研究了清水县耕层土壤主要养分的空间变异特征以及在不同乡镇和土类中的平均含量,生成了主要土壤养分的空间分布图.结果表明:清水县土壤有机质含量变异属于中等变异;由西向东呈现增加趋势;草甸土和沼泽土有机质含量最高,黄绵土有机质含量最低;全氮含量变异属于强变异;有效磷含量变异属于中等变异,有效磷整体含量较低,暗色草甸土有效磷含量最高,棕壤中有效磷含量最低;速效钾含量变异属于弱等变异,研究区域内各乡镇土壤速效钾含量差异不大,棕壤中速效钾含量最高,沼泽土速效钾含量最低.

Based on application modules and statistical methods of ArcGIS software,with the sampling data of soil testing and formulated fertilization project and graphic documents of soil fertility evaluation project,we studied the spatial variation characteristics of the main topsoil nutrients and average content in different towns and soil types in Qingshui County,we also created the spatial distribution map of the main nutrients.The results showed as follows：in Qingshui County,soil organic matter presented moderate variability and a rising trend from west to east;the organic matter contents of the meadow soil and boggy soil were the highest,while that of the loess soil was the lowest.Total Nitrogen presented strong variation.The available phosphorus presented moderate variation,its content was low,the available phosphorus content of the dark meadow soil was the highest while that of the brown soil was the lowest.The available potassium presented weak mutation and the whole difference was little,the available potassium content of the brown soil was the highest while that of the boggy soil was the lowest.