地质与资源2025，Vol.34Issue(4)：442-450,9.DOI:10.13686/j.cnki.dzyzy.2025.04.006
地表基质养分元素空间变异及合理采样数确定
Spatial variation of nutrient elements in ground substrate and determination of suitable sampling numbers:A case study of Wanjinshan Township in Baoqing County,Heilongjiang Province
摘要
Abstract
Taking Wanjinshan Township of Baoqing County as an example,the paper analyzes the spatial variability of four nutrient elements(soil organic matter,hydrolyzable nitrogen,rapidly available potassium,and available phosphorus)in ground substrate using ArcGIS 10.5 geostatistical analysis module,and studies the rationality of ordinary Kriging interpolation results for organic matter in different sampling densities.The cross validation is employed to assess interpolation accuracy by the root mean square error(RMSE)and correlation coefficient between predicted and actual values,ultimately determining the suitable number of sampling points.The results indicate that the spatial variability of all nutrient elements in ground substrate belongs to moderate variation,with the order of coefficient of variation(CV):available phosphorus＞organic matter＞hydrolyzable nitrogen＞rapidly available potassium.The substrate effect of ground substrate nutrient elements all shows moderate spatial autocorrelation,among which organic matter has the largest substrate effect,while hydrolyzable nitrogen,rapidly available potassium,and available phosphorus have relatively smaller substrate effects.The order of autocorrelation distance of nutrient elements is hydrolyzable nitrogen＞available phosphorus＞rapidly available potassium＞organic matter.The spatial variability analysis of ground substrate organic matter under different sampling densities shows that the suitable number of sampling points in Wanjinshan Township should be no less than 439,corresponding to a reasonable sampling density of more than 2 points per square kilometer(2 points/km2).关键词
地表基质/养分元素/空间变异/采样数/黑龙江省Key words
ground substrate/nutrient element/spatial variation/sampling number/Heilongjiang Province分类
天文与地球科学引用本文复制引用
赵建,何金宝,孔繁鹏,张洪文,刘博文,刘洪博,张也,董凯,邵吉亮..地表基质养分元素空间变异及合理采样数确定[J].地质与资源,2025,34(4):442-450,9.基金项目
中国地质调查局自然资源综合调查项目"三江平原宝清地区黑土地地表基质层调查"(DD20211588). （DD20211588）
