海涂围垦区耕地土壤电导率三维空间变异性及其作物种植风险评价研究  

Three Dimensional Variation and Risk Evaluation of Soil Electrical Conductivity in a Paddy Rice Soil

作　　者：李洪义[1,2] 何方义[1] 吴次芳[2] 李芳颢[3] 吴平[3] 史舟[4] 

机构地区：[1]江西财经大学旅游与城市管理学院,江西南昌330013 [2]浙江大学公共管理学院,浙江杭州310029 [3]江西省国土资源勘测规划院,江西南昌330096 [4]浙江大学环境与资源学院,浙江杭州310029

出　　处：《土壤通报》2013年第5期1060-1066,共7页Chinese Journal of Soil Science

基　　金：国家"863"计划项目(2011AA100705);国家自然科学基金资助项目(40871100;41101197);教育部人文社会科学研究资助项目(10YJC910002);江西省自然科学基金资助项目(20114BAB213017)资助

摘　　要：采用析取克立格法开展海涂围垦区耕地土壤电导率三维空间变异性及其作物种植风险评价研究。将各深度土层的土壤电导率插值结果、大于一定阈值的条件概率分布结果切片进行叠加,可直观的表达土壤电导率的三维空间变异规律及作物种植风险的三维分布图。考虑表层土壤盐分的影响,研究区种植水稻的高风险区域面积比例为65.01%;考虑0.55 m深度以上土层电导率的影响,则种植棉花的高风险区域为0;若考虑0.55 m以下深度土层盐分的影响,研究区完全不适宜种植水稻;种植棉花的高风险区域面积比例也逐渐增大。进一步考虑深层土壤盐分的影响,可进一步提高种植决策的准确性。In this study, Disjunctive Kriging method was used to predict three dimensional variation, and evaluate the plant risk of soil electrical conductivity in a paddy rice soil. To overcome the problem of visualization in three dimensions, in which we view the layers obliquely from above in sequence, the starting at the base 110 cm deep and adding one or more layers at a time and showing the vertical variation on the southern and eastern faces of the field as the layers are added. If only take the salinity of faces of the field into account, while the area proportion of high risk plant region for rice is 65.01%, which for cotton is 0. Taking the salinity under 0.55m depth into account, the whole area is not fit to pant rice. With the increasing of depth, the area of high risk pant region for cotton is increasing.

关 键 词：电导率 非线性地统计 三维空间变异 析取克立格 风险评价 

分 类 号：S156[农业科学—土壤学]