| 黄河三角洲土壤表观电导率空间变异稳健性分析 |
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| 引用本文： | 姚荣江,杨劲松.黄河三角洲土壤表观电导率空间变异稳健性分析[J].辽宁工程技术大学学报(自然科学版),2009,28(2). |
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| 作者姓名： | 姚荣江 杨劲松 |
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| 作者单位： | 中国科学院南京土壤研究所,江苏,南京,210008 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国家科技支撑计划，中国科学院南京土壤研究所创新领域前沿项目，中国科学院知识创新虎程重大项目，国家自然科学基金 |
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| 摘 要： | 针对目前黄河三角洲地区存在的土壤盐渍障碍问题,结合电磁感应仪EM38移动测定系统的田间测量,对表征该地区土壤盐分的土壤表观电导率进行了空间变异特征分析,研究了变异函数随样点数量变化的稳健性,并探讨了Kriging插值精度与样点数量之间的关系.结果表明,土壤表观电导率的变异函数表现出多层次叠加的尺度效应,其变异函数较好地符合球状套合模型,短程变异是构成空间异质性的最主要部分.变异函数对样点比例的减少总体不敏感,当样点比例低于lO%,变异函数开始发生形变.Kriging插值精度与空间相似性均随样点比例降低呈下降趋势,当样点比例在20%-80%时,Kriging插值精度对样点比例的降低不敏感;在保证得到稳健的变异函数图的前提下,样点比例降至30%,基本不会损失Kriging插值得到的空间分布信息.
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| 关 键 词： | 黄河三角洲 土壤表观电导率 空间变异 稳健性 |
Robustness analysis on spatial variability of apparent soil electrical conductivity in Yellow River Delta |
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| YAO RongJiang,YANG Jingsong.Robustness analysis on spatial variability of apparent soil electrical conductivity in Yellow River Delta[J].Journal of Liaoning Technical University (Natural Science Edition),2009,28(2). |
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| Authors: | YAO RongJiang YANG Jingsong |
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| Institution: | Institute of Soil Science;Chinese Academy of Sciences;Nanjing 210008;China |
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| Abstract: | Aiming at the problem of soil salinization existing in the Yellow River Delta at present,spatial variability of soil salinity characterized by apparent soil electrical conductivity was analyzed with the application of mobile sensing system of electromagnetic induction EM38,the robustness and sensitivity of semivariogram to the change of sample quantity was studied,and the relation between Kriging interpolation accuracy and sample quantity was further discussed.Results indicate that nested spherical model wa... |
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| Keywords: | Yellow River Delta apparent soil electrical conductivity spatial variability robustness |
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