插值方法与样点数对县域土壤有效磷空间变异特征评价的影响  

Influence of interpolation method and sampling number on spatial prediction accuracy of soil Olsen-P

作　　者：孙义祥[1,2] 吴传洲 朱克保 崔振岭[1] 陈新平[1] 张福锁[1] 

机构地区：[1]中国农业大学资源与环境学院,北京100193 [2]安徽省农业科学院土壤肥料研究所,合肥230031 [3]安徽省芜湖县土壤肥料工作站,安徽芜湖241100

出　　处：《应用生态学报》2009年第3期673-678,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30700478);国家“十一五”科技支撑计划项目(2006BAD10B03,2006BAD10B08)资助

摘　　要：与欧美大规模农场经营不同,土地分散经营使我国县域土壤养分空间变异特征评价更加困难.本研究以安徽芜湖土壤有效磷为例,系统地评价插值方法与样点数对县域土壤养分空间变异特征评价准确性的影响.结果表明:局部多项式、普通克里格、简单克里格和析取克里格插值方法的评价效果优于反距离加权法、全局多项式、径向基插值和泛克里格等插值方法,考虑到实际操作简单,推荐用普通克里格方法进行县域土壤有效磷空间变异特征评价.随着参与空间插值样点数的增加,县域土壤有效磷空间变异特征预测的准确性增加,充分考虑评价的准确性和田间取样费用,建议县域土壤有效磷空间变异特征评价的适宜样点数应介于500～1000个.Different from the large scale farm management in Europe and America, the scattered farmland management in China made the spatial variability of soil nutrients at county scale in this country more challenging. Taking soil Olsen-P in Wuhu County as an example, the influence of interpolation method and sampling number on the spatial prediction accuracy of soil nutrients was evaluated systematically. The results showed that local polynomial method, ordinary kriging, simple kriging, and disjunctive kriging had higher spatial prediction accuracy than the other interpolation methods. Considering of its simplicity, ordinary kriging was recommended to evaluate the spatial variability of soil Olsen-P within a county. The spatial prediction accuracy would increase with increasing soil sampling number. Taking the spatial prediction accuracy and soil sampling cost into consideration, the optimal sampling number should be from 500 to 1000 to evaluate the spatial variability of soil Olsen-P at county scale.

关 键 词：空间变异 土地分散经营 土壤有效磷 插值 

分 类 号：S158.9[农业科学—土壤学]