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在试验的基础上,建立了杨凌及其周边地区0~20 cm土层和20~40 cm土层非饱和土壤水分扩散率的单一参数模型,并运用统计学原理和多重分形方法对不同土层单一参数模型中参数S的空间变异规律和尺度效应进行了分析。结果表明:0~20 cm土层和20~40 cm土层参数S都属于中等变异程度;0~20 cm土层和20~40 cm土层参数S的空间分布格局的多重分形特征都比较明显,但0~20 cm土层参数S在空间上的变化更加复杂;0~20 cm土层和20~40 cm土层参数S的多重分形谱的宽度分别为0.2667和0.2158,都呈现不同程度的左偏,说明不同土层参数S的空间变异性比较强,且都主要是由高值分布引起的。多重分形分析能够揭示出研究区域内不同土层参数S分布的较多局部信息。
Based on the experiment, a single parameter model of unsaturated soil moisture diffusivity in 0 ~ 20 cm soil layer and 20 ~ 40 cm soil layer was established in Yangling and its surrounding areas. The data of different soil layers The spatial variation law and scale effect of parameter S in a single parameter model are analyzed. The results showed that the parameters S of 0 ~ 20 cm soil layer and 20 ~ 40 cm soil layer all belong to the medium degree of variation. The multifractal characteristics of the spatial distribution pattern of soil parameter S in 0 ~ 20 cm soil layer and 20 ~ 40 cm soil layer are obvious , But the spatial variation of parameter S in 0 ~ 20 cm soil layer was more complicated. The multifractal spectrums of parameter S in 0 ~ 20 cm soil layer and 20 ~ 40 cm soil layer were 0.2667 and 0.2158, respectively, Left deviation, indicating that different soil parameters S spatial variability is relatively strong, and are mainly caused by the distribution of high values. Multifractal analysis can reveal more local information of S distribution in different soil layers in the study area.