Spatial Interpolation and Sample Size Optimization for Soil Copper (Cu) Investigation in Cropland Soil at County Scale U

Knowledge on spatial distribution and sampling size optimization of soil copper (Cu) could lay solid foundations for environmetal quality survey of agricultural soils at county scale. In this investigation, cokriging method was used to conduct the interpolation of Cu concentraiton in cropland soil in Shuangliu County, Sichuan Province, China. Based on the original 623 physicochmically measured soil samples, 560, 498, and 432 sub-samples were randomly selected as target variable and soil organic matter (SOM) of the whole original samples as auxiliary variable. Interpolation results using Cokriging under different sampling numbers were evaluated for their applicability in estimating the spatial distribution of soil Cu at county sacle. The results showed that the root mean square error (RMSE) produced by Cokriging decreased from 0.9 to 7.77%, correlation coefficient between the predicted values and the measured increased from 1.76 to 9.76% in comparison with the ordinary Kriging under the corresponding sample sizes. The prediction accuracy using Cokriging was still higher than original 623 data using ordinary Kriging even as sample size reduced 10%, and their interpolation maps were highly in agreement. Therefore, Cokriging was proven to be a more accurate and economic method which could provide more information and benefit for the studies on spatial distribution of soil pollutants at county scale.

作 者： PANG Su LI Ting-xuan WANG Yong-dong YU Hai-ying LI Xi   作者單位： College of Resource and Environmental Science, Sichuan Agricultural University, Ya'an 625014, P.R. China  刊 名： 中國農業科學（英文版）  英文刊名： AGRICULTURAL SCIENCES IN CHINA  年，卷(期)： 2009 8(11)  分類號： S1  關鍵詞： cropland soil   county scale   copper   Cokriging   sampling size  

【Spatial Interpolation and Sample Siz】相關文章：

Sample Outline and Essay05-04

Generation and Application of Spatial Atmospheric Turbulence Field in Flight Simulation04-26

STUDY ON SPATIAL LANDSCAPE PATTERN OF YANTAI CITY BASED ON RS AND GIS04-27

An analysis on spatial variation of urban human thermal comfort in Hangzhou,China04-26

Spatial and temporal variability of agricultural pollutants in an agricultural headwater stream within a multipond syste04-26

Spatial variability and representation of seabed sediment grain sizes:An example from the Zhoushan-Jinshanwei transect,04-27

Morphological and Spatial Effects on Toughness and Impact Damage Resistance of PAEK-toughened BMI and Graphite Fiber Com04-26

Temporal and spatial variations of atmospheric methane concentration and δ13C-CH4 near the surface on the Millor Peninsu04-27

Spatial Analyst在用地選址中的應用--以哈-大-齊工業走廊大慶地區為例04-26

基于MapX和Oracle Spatial的空間數據庫管理系統開發04-27