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土壤孔隙对水分、养分的运移起着重要作用,重构土壤孔隙状况反映着复垦土壤质量的高低。本研究基于Math Works Matlab(2009a)平台,在对土壤孔隙CT扫描图片三维重建的基础上,运用多重分形理论对安太堡露天煤矿不同复垦年限排土场重构土壤(23年、20年、0年)以及原地貌土壤进行三维多重分形定量表征,以探讨重构土壤孔隙空间分布规律。结果表明:重构土壤孔隙三维结构具有多重分形特征,信息熵维D1、广义维数谱曲线弯曲程度△D、多重分形谱谱宽△α随着复垦年限逐渐增大,土壤孔隙状况得到改善,土壤孔隙分布越趋于复杂,变异程度较高;重构土壤及原地貌土壤孔隙三维分布多重分形谱函数△f>0,呈左钩状,大概率孔隙占主要地位,孔隙分布不均匀。多重分形参数D1、D0-D1、△D、△α、△f间具有较好的相关性,从不同角度上反映了土壤孔隙三维分布的非均质性。
Soil porosity plays an important role in the transport of water and nutrients. The reconstruction of soil porosity reflects the quality of reclaimed soil. Based on MathWorks Matlab (2009a) platform, based on the three-dimensional reconstruction of CT pictures of soil pores, the study used the theory of multifractal to reconstruct the soil of Antarctica Opencast Mine in different reclamation years (23 years, 20 years , 0 years) as well as the original landform soil to conduct quantitative multi-fractal characterization, in order to discuss the spatial distribution of the refactored soil pore space. The results show that the three-dimensional structure of soil pores has the characteristics of multifractal, the information entropy dimension D1, the bending degree of generalized spectral curve △ D and the multifractal spectrum width △ α gradually increase with the reclamation age, and the soil pore condition is improved , The soil pore distribution tends to be more complicated and the degree of variation is higher. The three-dimensional multifractal spectrum function of soil pore and the original landform is Δf> 0, showing the left hook shape. The high probability pore occupies the main position and the pore distribution is not uniform. The multifractal parameters D1, D0-D1, △ D, △ α, △ f have good correlation, reflecting the heterogeneity of soil pore three-dimensional distribution from different angles.