南方农田土壤容重空间变异性及其尺度效应

发布时间：2018-04-19 05:24

本文选题：土壤容重 + 空间变异　；参考：《排灌机械工程学报》2017年05期

【摘要】：以南方典型农田作物生长地为试验区,利用经典统计与地统计学方法,分析研究了选定区域不同深度土层(0~10,10~20 cm)土壤容重的空间异质性及其尺度效应,并对试验区农田土壤容重进行空间插值估算.结果表明农田土壤容重变异系数较小,为弱变异.半方差函数分析表明土壤容重的块基比小于10%,田间土壤容重由空间自相关部分引起的异质性程度很大.在尺度效应研究中,随着采样幅度增大,变异系数呈先减小后增大趋势;通过调整采样点位置"再采样"发现,当采样间距增大时,土壤容重变异系数变化幅度很小(6.32%~7.92%),而相关距离却减小.说明当采样幅度一定时,采样间距对土壤容重变异系数的影响很小.通过空间插值估算,绘制等值线图发现两层土壤容重也具有相关联的空间分布规律,且呈显著正相关关系,相关系数为0.76.此外,土壤容重空间变异受人为活动影响程度大.
[Abstract]:The spatial heterogeneity and scale effect of soil bulk density of different depth soil layers in selected regions were studied by using classical statistics and geostatistics methods.The soil bulk density in the experimental area was estimated by spatial interpolation.The results showed that the coefficient of variation of bulk density of farmland soil was small and the variation was weak.Semi-variance function analysis showed that the bulk to base ratio of soil bulk density was less than 10, and the heterogeneity of soil bulk density caused by spatial autocorrelation was very large.In the study of scale effect, with the increase of sampling amplitude, the coefficient of variation decreases first and then increases. By adjusting the sampling point position "resampling", it is found that when the sampling distance increases,The variation range of soil bulk density variation coefficient is very small, 6.32% and 7.92%, but the correlation distance decreases.The results showed that the sampling spacing had little effect on the coefficient of variation of bulk density when the sampling amplitude was constant.Through the spatial interpolation estimation, it was found that the spatial distribution of the bulk density of the two layers of soil was also related to the spatial distribution, and the correlation coefficient was 0.76.In addition, the spatial variation of soil bulk density is greatly affected by human activities.
【作者单位】：江苏省土地开发中心;河海大学环境学院;河海大学水利水电学院;
【基金】：国家自然科学基金资助项目(41471180) 江苏省国土资源科技项目(KJXM2016003)
【分类号】：S152.5

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