多尺度多分辨率破碎方法评价土壤结构的原理及其应用

Theory and application of multi-scale and multi-resolution fragmentation method for soil structure evaluation

在数学描述上,应力小波破碎分析具有小波分析相同的形式,因此,能够将小波分析的理论进行重新阐释,以使其适用于破碎研究。结果发现,应力小波方法在描述破碎体结合面的结合强度方面具有特殊性。同时表明土壤破碎体分形维数是土壤结构的宏观统计学指标,而土壤破碎体的单粒能量消耗值是土壤结构的微观应力小波指标,只有综合使用这两个指标才能够全面地评价土壤的结构状态。在不同季节进行相同的机械耕作处理下,南京水田农地的耕作层土壤结构表现差异明显。秋季耕作土壤的应力小波指标明显优于春季耕作的土壤,同时,秋季耕作土壤的分形维数也远大于春季耕作的土壤。

The stress-wavelets method for soil fragmentation analysis has the same mathematical form with the wavelets method.Therefore,the wavelets theories can be re-interpreted,and then it applies to soil fragmentation research.Speciality was revealed from the results by applying stress-wavelets method to describe soil surface contacting energies.It also showed that fragment fractal dimension was a macroscopic statistical index for soil structure,while per fragment energy consumption was related to microscopic stress-wavelets index.A combination of those two indices gave a comprehensive evaluation of soil structural properties.The structure of paddy soil in Nanjing had significiant difference under the same treatment but in different seasons.The stress-wavelets index was well improved in autumn-tilled soil when compared with spring-tilled soil,and the fragment fractal dimension was also higher in autumn-tilled soil.