论文部分内容阅读
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, land dispersion management makes it more difficult to evaluate the spatial variability of soil nutrients in our county .In this study, the soil available phosphorus in Wuhu of Anhui Province was used as an example to evaluate the spatial variability of soil nutrients Accuracy.The results show that the evaluation results of local polynomials, ordinary kriging, simple kriging and extraction kriging interpolation method are better than those of inverse distance weighting method, global polynomial, radial basis interpolation and pan-kriging And other interpolation methods, taking into account the actual operation is simple, it is recommended to use ordinary Kriging method to evaluate the characteristics of spatial variability of soil available phosphorus .With the participation of spatial interpolation sample points increase, the accuracy of spatial variability prediction of soil available phosphorus increased, Considering the accuracy of the evaluation and the cost of sampling in the field, it is suggested that the suitable sampling points for evaluating the spatial variability of soil available P in the county should be between 500 and 1000.