微观尺度上土壤孔隙及其分维数的SEM分析
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中国博士后科学基金(2003034010)资助


SEM ANALYSIS OF SOIL PORE AND ITS FRACTAL DIMENSION ON MICRO SCALE
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    摘要:

    对两类不同质地土壤的SEM图像,利用数字图像技术分析孔隙的大小、数量及其分布规律,由测量数据给出了微观尺度上土壤孔隙的质量分维数Dm和表面分维数Ds.结果表明:Dm与土壤质地、容重、孔隙度、孔径分布等之间存在一定的相关关系,土壤质地越细、容重越大、孔隙度越低、小孔隙越多,Dm越大,Dm与土壤容重和孔隙度均存在显著线性回归关系;Ds反映了土壤孔隙轮廓边界的曲折程度,孔隙轮廓越不规则,Ds越大,土壤中各孔隙的Ds分布符合总体正态分布形式.DmDs的数值大小对不同利用方式和耕作制度下的土壤较为敏感,分维数可为土壤科学管理提供依据.

    Abstract:

    Samples of two soils different in soil texture were collected and scanned with a scanning electron microscope(SEM) producing SEM images in the scale ranging from 0.1 to 127.8 μm for analysis of size and number of pores and their distributions.The mass fractal dimension Dm and the surface fractal dimension Ds of soil pores are obtained from the measured data.The analysis shows that the certain correlativity of Dm existed with soil texture,bulk density,porosity and pore-size distribution.The finer the soil texture,the larger the bulk density,the lower the porosity,the higher the percentage of small pores,and the larger the Dm.Dm displayed a significant linear regression relationship with soil bulk density and soil porosity of soil.Ds reflects the degree of irregularity of the pore-solid interface in soil,and the larger the Ds the more irregular the soil pore profile.The distribution of Ds was found in agreement with a total normal distribution in soil pore.Both Dm and Ds was sensitive to variation of management pattern and tillage system of soils and they may be cited as useful indicators for soil management.

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张季如,黄丽,祝杰,黄文竞.微观尺度上土壤孔隙及其分维数的SEM分析[J].土壤学报,2008,45(2):207-215. DOI:10.11766/trxb200610080234 Zhang Jiru, Huang Li, Zhu Jie, Huang Wenjing. SEM ANALYSIS OF SOIL PORE AND ITS FRACTAL DIMENSION ON MICRO SCALE[J]. Acta Pedologica Sinica,2008,45(2):207-215.

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  • 收稿日期:2006-10-08
  • 最后修改日期:2006-12-14
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  • 在线发布日期: 2013-05-10
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