山地丘陵耕地土壤养分最优插值方法研究——以江西省渝水区水北镇为例

摘要

The relationship between soil nutrient content and elevation and slope was evaluated based on the farmland soil nutrient data of 823 sampling sites in Shuibei town, Yushui country,Jiangxi province. The method of co-Kriging was used with elevation and slope considered, and the result of cross-examination were compared with that by inverse distance weight (IDW) and ordinary Kriging. Results revealed that the accuracy of interpolation was obviously improved when elevation and slope were combined. Among the three interpolation methods, co-Kriging was the best one and followed by ordinary Kriging.%以江西省渝水区水北镇为研究区,利用823个采样点的耕地土壤养分数据,分析区内耕地土壤养分含量与海拔、坡度的相关性,采用协同克里格插值方法,结合海拔、坡度进行插值,并把经交叉检验后的结果与逆距离权重法、普通克里格法的结果进行比较.结果表明,结合海拔、坡度进行插值后,精度有明显提高.插值精度排序为协同克里格法>普通克里格法>逆距离权重法,在3种插值方法中,协同克里格法为最优插值法.