Spatial distribution of soil nutrients in reclamation dump sites based on subdivision IDW
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摘要: 准确掌握土壤养分的空间分布，对于评价复垦排土场土壤质量，并制定相应的复垦措施具有重要意义，但是排土场的复杂地形导致一般插值方法的预测效果较差。以内蒙古锡林浩特盟胜利一号露天矿北排土场为例，采用基于地形分区的反距离权重法对土壤养分（速效氮、速效钾、有效磷和有机质）进行空间插值并与常规反距离权重法和克里金插值法进行比较。结果表明，使用分区反距离权重法插值得到的交叉验证精度均高于克里金插值法与反距离权重法，除此之外，有效磷的R2值为0.22，速效氮的R2值为0.37，速效钾以及有机质的R2值分别为0.34与0.14，同样高于克里金插值法与反距离权重法。插值结果显示，排土场速效氮含量整体由北至南逐渐减少；有效磷含量仅在中心地区稍高；速效钾在研究区东北部含量偏高；土壤有机质在中心地区含量相对偏低。研究成果为露天矿排土场土壤养分评价提供借鉴。Abstract: Accurately grasping the spatial distribution of soil nutrients is of great significance for evaluating the soil quality of reclamation dumps and formulating corresponding reclamation measures. The general interpolation method of the complex terrain of the dump site has a poor prediction effect. The northern dump of Shengli No.1 open-pit mine in Xilinhot, Inner Mongolia was selected as an example in the paper. The soil nutrients(available nitrogen, available potassium, available phosphorus and organic matter) were spatially interpolated using the inverse distance weighting method based on terrain partitioning, and compared with the conventional inverse distance weighting method and kriging interpolation method. The results show that the cross-validation accuracy obtained by using the partitioned inverse distance weighting method was higher than that of the kriging interpolation method and the inverse distance weighting method. In addition, the R2 value of available phosphorus was 0.22, and the R2 value of available nitrogen was 0.37. The R2 values of available potassium and organic matter were 0.34 and 0.14, respectively. They were also higher than Kriging interpolation and inverse distance weighting. In addition, the partitioned inverse distance interpolation method could accurately estimate the extreme points of the measured points, and could better reflect the details of the spatial distribution of soil nutrients in the dump.
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Keywords:
- dump /
- soil nutrients /
- spatial distribution /
- subdivision IDW /
- Shengli mining area
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