基于GS+和ArcGIS的蒲江县耕地土壤养分空间变异分析

Spatial Variability Analysis of Soil Nutrients in Cultivated Land of Pujiang Based on Gs+and ArcGIS

基于GS+7.0、ArcGIS10.2建立蒲江县全氮、碱解氮、有效磷、速效钾、有机质5种耕地土壤养分含量的最优半方差函数模型,利用该模型进行了空间变异和普通Kriging空间插值分析。研究区土壤全氮、碱解氮、有机质均具有中等空间变异性,有效磷、速效钾表现为弱空间变异性。全氮、碱解氮含量高低受地形、成土母质、土壤类型等自然条件和施肥、种植模式、耕作措施等人为活动的共同影响,有机质更多地受人为活动的影响,而有效磷、速效钾则主要决定于人为活动的作用。5种土壤养分含量的空间插值图可直观地表达县域耕地土壤养分的含量水平及其分布状况,使用该图件可方便地提出相应的平衡施肥建议。

Based on GS+7.0 and ArcGIS 10.2,the optimized semi-variance model of five arable soil nutrients in Pujiang was established,including total nitrogen(TN),alkali-hydrolyzable nitrogen(AN),available phosphorus(AP),available potassium(AK)and organic matter(OM),by which spatial variability and Kriging interpolation were analyzed.The contents of TN,AN,OM had moderate spatial variabilities,while AP and AK showed weak spatial variabilities.The contents of TN and AN were affected by natural characteristics such as topography,parent material and soil type,and anthropogenic activities such as fertilization,planting patterns and tillage measures.OM tended to be influenced by human activities,while AP and AK were mainly affected by human activities.Spatial interpolation map of five arable soil nutrients could visually show the level and distribution of soil nutrients.Recommendation for balanced fertilization could be put forward by using this map.