本文選題：土壤水分特征曲線　切入點：土壤水分?jǐn)U散率　出處：《西北農(nóng)林科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：土壤水分運動參數(shù)是土壤水分運移研究的重要因素之一,水分運動參數(shù)的空間變異性也受到了重視與關(guān)注。本論文利用經(jīng)典統(tǒng)計學(xué)方法、多重分形方法、聯(lián)合多重分形方法和土壤傳遞函數(shù),以楊凌及其周邊地區(qū)為例,在試驗的基礎(chǔ)上建立了區(qū)域尺度上0-20cm土層和20-40cm土層土壤水分特征曲線的單一參數(shù)模型、非飽和土壤水分?jǐn)U散率的單一參數(shù)模型,研究分析了不同土層單一參數(shù)模型中參數(shù)在單一尺度和多尺度上的空間變異性,探討了上下不同土層的單一參數(shù)模型中參數(shù)之間在多尺度上空間變異性的相互關(guān)系,同時對不同土層單一參數(shù)模型中參數(shù)與土壤物理特性在多尺度上的相互關(guān)系進行了探討,并基于此構(gòu)建了區(qū)域尺度上0-20cm土層和20-40cm土層單一參數(shù)模型中參數(shù)的土壤傳遞函數(shù)。主要得出以下結(jié)論:(1)基于經(jīng)典統(tǒng)計學(xué)方法、多重分形和聯(lián)合多重分形分析可知,構(gòu)建的楊凌及其周邊地區(qū)0-20cm土層和20-40cm土層的土壤水分特征曲線單一參數(shù)模型中參數(shù)F具有中等變異程度;不同土層參數(shù)F的多重分形特征明顯,0-20cm土層參數(shù)F空間變異性主要是由其低值引起的,20-40cm土層參數(shù)F空間變異性主要是由其高值分布引起的;0-20cm土層參數(shù)F與20-40cm土層參數(shù)F在多尺度上具有較高的相關(guān)程度或某些相同的空間分布。(2)基于單對數(shù)模型建立的楊凌及其周邊地區(qū)0-20cm土層和20-40cm土層非飽和土壤水分?jǐn)U散率的單一參數(shù)模型中參數(shù)S都屬于中等變異程度;多重分形方法分析結(jié)果表明不同土層參數(shù)S的空間分布格局的多重分形特征比較明顯,且空間變異性都主要是由高值分布引起的;聯(lián)合多重分形方法分析結(jié)果顯示,0-20cm土層參數(shù)S的空間變異性與20-40cm土層參數(shù)S的空間變異性之間的相互關(guān)系在多尺度上是顯著存在的。(3)單一尺度與多尺度空間相關(guān)性分析對比可知,0-20cm土層、20-40cm土層單一參數(shù)模型中參數(shù)與影響因素之間的空間相關(guān)特征在單一尺度和多尺度上并不完全相同,說明單一尺度上的分析不一定能夠完整地揭示出單一參數(shù)模型中參數(shù)與影響因素之間的空間相關(guān)特性。因此,為了更加深入的揭示造成不同土層單一參數(shù)模型中參數(shù)空間變異性的因素,應(yīng)當(dāng)加強不同土層單一參數(shù)模型中參數(shù)與影響因素在多尺度上空間相關(guān)性的分析研究。(4)根據(jù)聯(lián)合多重分形研究分析所得結(jié)論分別建立了區(qū)域尺度上0-20cm土層和20-40cm土層土壤水分特征曲線單一參數(shù)模型中參數(shù)F的土壤傳遞函數(shù)、土壤水分?jǐn)U散率單一參數(shù)模型中參數(shù)S的土壤傳遞函數(shù)。其中0-20cm土層和20-40cm土層參數(shù)F的土壤傳遞函數(shù)預(yù)測值的RMSE分別為0.9684和0.6230,0-20cm土層和20-40cm土層參數(shù)S的土壤傳遞函數(shù)預(yù)測值的RMSE分別為0.3569和0.4925,所建土壤傳遞函數(shù)的預(yù)測值與實測值都比較接近,為較大區(qū)域土壤水分特征曲線和土壤水分?jǐn)U散率的估算提供參考。
[Abstract]:The parameters of soil moisture movement are one of the important factors in the study of soil moisture migration, and the spatial variability of soil water movement parameters has also been paid attention to. In this paper, the classical statistical method and multifractal method are used. Combined with multifractal method and soil transfer function, taking Yang Ling and its surrounding area as examples, a single parameter model of soil moisture characteristic curve of 0-20cm soil layer and 20-40cm soil layer on regional scale was established on the basis of experiments. The single parameter model of unsaturated soil water diffusivity is studied and the spatial variability of parameters in single parameter model of different soil layers on single scale and multi scale is studied. The relationship between the spatial variability of the parameters in the single parameter model of different soil layers on multiple scales and the relationship between the parameters and the soil physical characteristics in the single parameter model of different soil layers on multiple scales are discussed. Based on this, the soil transfer function of 0-20cm soil layer and 20-40cm soil layer single parameter model is constructed. The main conclusions are as follows: (1) based on the classical statistical method, multifractal and joint multifractal analysis, we can know that, In the single parameter model of soil moisture characteristic curve constructed by Yang Ling and its surrounding areas in 0-20cm and 20-40cm soil layers, the parameter F has a moderate degree of variation. The multifractal characteristics of different soil layer parameters F are obvious. The spatial variability of 0-20cm soil layer parameter F is mainly caused by its low value and the spatial variability of its 20-40cm soil layer parameter F is mainly caused by its high value distribution of 0-20cm soil layer parameter F and 20-40cm soil layer parameter F and 20-40cm soil layer. Parameter F has higher correlation degree or some same spatial distribution on multi-scale.) based on the single logarithmic model, a single parameter model of unsaturated soil water diffusivity of 0-20cm soil layer and 20-40cm soil layer in Yang Ling and its surrounding area is established. The middle parameter S belongs to the moderate degree of variation. The results of multifractal analysis show that the multifractal characteristics of the spatial distribution pattern of different soil parameters S are obvious, and the spatial variability is mainly caused by the high value distribution. The results of joint multifractal analysis show that the spatial variability of 0-20cm soil layer parameter S and the spatial variability of 20-40cm soil layer parameter S are significant in multi-scale. The characteristics of spatial correlation between the parameters and the influencing factors in the single parameter model of 0-20cm soil layer 20-40cm soil layer are not identical in single scale and multi-scale. It shows that the analysis on a single scale does not necessarily reveal the spatial correlation between the parameters and the influencing factors in a single parameter model. In order to reveal the factors that cause the spatial variability of parameters in the single parameter model of different soil layers, The spatial correlation between parameters and influencing factors in single parameter model of different soil layers should be strengthened. (4) based on the conclusion of joint multifractal analysis, 0-20cm soil layer and 20-40cm soil layer on regional scale are established respectively. The soil transfer function of parameter F in a single parameter model of soil moisture characteristic curve, The soil transfer function of parameter S in a single parameter model of soil moisture diffusivity, in which the RMSE of the predicted values of soil transfer function for 0-20cm soil layer and 20-40cm soil layer parameter F is 0.9684 and 0.62300-20cm soil layer and 20-40cm soil layer parameter S respectively. The RMSE of the predicted values were 0.3569 and 0.4925, respectively. The predicted values of the soil transfer function were close to the measured values. It provides a reference for the estimation of soil moisture characteristic curve and soil water diffusivity in larger area.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S152.7

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