样点数对县域土壤养分空间变异特征评价的影响

以广东省阳西县测土配方施肥耕地地力调查数据为基础,应用地统计学和GIS空间分析技术,对耕层土壤pH、有机质、全氮、有效磷和速效钾进行空间插值质量研究。结果表明：（1）土壤养分变异系数的顺序为速效钾〉速效磷〉有机质〉全氮〉pH,插值误差随土壤养分空间变异系数增大而增加。（2）插值精度随着插值样点数的增加而不断提高,土壤养分的预测值与实测值的相关系数逐渐增加。采样密度相同时,土壤养分的标准均方根误差（NRMSE）值由大到小的变化顺序是速效钾〉有效磷〉全氮〉有机质〉pH值。（3）对阳西县土壤养分空间变异情况进行评价时,土壤pH值和全氮采样时应以30～60 hm2耕地为一个采样单元;土壤有机质采样时应...

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Bibliographic Details
Published in广东农业科学 Vol. 39; no. 6; pp. 71 - 74
Main Author 代丽娜 甘海华 卢瑛 白胤龙 黄伊梨 刘新平
Format Journal Article
LanguageChinese
Published 华南农业大学资源环境学院,广东广州,510642 2012
Subjects
县域
土壤养分
插值精度
样点数
空间变异
土壤养分
县域
样点数
空间变异
插值精度
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Summary:以广东省阳西县测土配方施肥耕地地力调查数据为基础,应用地统计学和GIS空间分析技术,对耕层土壤pH、有机质、全氮、有效磷和速效钾进行空间插值质量研究。结果表明：（1）土壤养分变异系数的顺序为速效钾〉速效磷〉有机质〉全氮〉pH,插值误差随土壤养分空间变异系数增大而增加。（2）插值精度随着插值样点数的增加而不断提高,土壤养分的预测值与实测值的相关系数逐渐增加。采样密度相同时,土壤养分的标准均方根误差（NRMSE）值由大到小的变化顺序是速效钾〉有效磷〉全氮〉有机质〉pH值。（3）对阳西县土壤养分空间变异情况进行评价时,土壤pH值和全氮采样时应以30～60 hm2耕地为一个采样单元;土壤有机质采样时应以20～30 hm2耕地为一个采样单元;土壤有效磷和速效钾采样时应最大以20 hm2耕地为一个采样单元。
Bibliography:44-1267/S
DAI Li-na,GAN Hai-hua,LU Ying,BAI Yin-long,HUANG Yi-li,LIU Xin-ping（College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China）
Based on the formulated fertilization survey data of Yangxi county of Guangdong province,spatial variability and accuracy of soil pH,organic matter,total nitrogen,available phosphorus and available potassium in surface soils were studied by using geostatistic and spatial analysis modules in ArcGIS.The results showed that：（1） The order of the coefficient of variation of soil nutrient was available potassium available phosphorusorganic mattertotal nitrogenpH.The interpolation error increased with the increase of the spatial variability of soil nutrients.（2） The accuracy of the interpolation improved with the increase of soil sampling number,and the correlation coefficient between predicted and measured soil nutrients increased.The order of the Normalized Root Mean Square Error（NRMSE） value of soil nutrient with the same sampling dens
ISSN:1004-874X
DOI:10.3969/j.issn.1004-874X.2012.06.023