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利用插值方法进行土壤属性的空间预测是土壤学科的研究热点之一,以土壤发生学相关信息作为辅助变量的克里格空间插值方法则少有研究。该文以成土母质多样的湖南省石门县为例,基于GS+、ArcGIS和Matlab,结合成土母质信息的克里格(PMK)插值方法,对研究区土壤速效钾空间分布进行了预测。结果表明,PMK法较好地解决了因成土母质间速效钾含量差异给预测带来的误差,预测精度较反距离权重(IDW)、普通克里格(OK)法分别提高了21.68%、16.43%;PMK法制作的空间预测图中速效钾分布突变而非渐变,较IDW、OK预测结果接近研究区实际情况,进而证明在成土母质较为复杂的地区,PMK法适合对土壤速效钾含量的预测。
Spatial prediction of soil properties using interpolation method is one of the hot topics in soil science research. However, the method of Kriging space interpolation based on the information of soil genesis is rarely studied. In this paper, Shimen County, Hunan Province, which has a diverse soil parent material, is taken as an example. Based on GS +, ArcGIS and Matlab, Kriging (PMK) interpolation method of soil parent material is used to predict the spatial distribution of available K in the study area. The results show that the PMK method can better solve the error caused by the difference of available K content in soil parent material, the prediction accuracy is increased by 21.68% compared with the inverse distance weight (IDW) and ordinary kriging (OK) 16.43%. The available potassium in the spatial prediction map produced by the PMK method changed suddenly rather than gradually. Compared with IDW and OK, the prediction results were close to the actual situation in the study area, which proves that the PMK method is suitable for the determination of available potassium Prediction.