本文選題：土壤水分特征曲線 + 高原土壤�。� 參考：《灌溉排水學(xué)報(bào)》2017年10期

【摘要】：西藏地區(qū)自然氣候特征、成土母質(zhì)和成土條件有著顯著的地區(qū)特性,了解西藏高原地區(qū)土壤水動(dòng)力學(xué)特性對(duì)于研究高原地區(qū)水文和水循環(huán)過(guò)程具有重要的意義。2015年分別在林芝地區(qū)米林縣(海拔2 905 m),八一鎮(zhèn)(海拔3 240 m)和林芝縣(海拔3 879 m)3個(gè)青稞種植區(qū)田間取樣,在原狀土土壤水分特征曲線測(cè)試的基礎(chǔ)上,研究了西藏林芝地區(qū)土壤基質(zhì)勢(shì)和土壤含水率之間的關(guān)系,并建立了參數(shù)的微分求解方程,發(fā)展了土壤水分特征曲線非線性函數(shù)的參數(shù)估計(jì)方法;基于實(shí)測(cè)值構(gòu)建Jacobi矩陣,采用全局性最優(yōu)方法確定了van Genuchten模型和Gardner-Russo模型的參數(shù)。結(jié)果表明,-11.0~-4.0、-42.0~-11.0 k Pa以及-54.0~-42.0 k Pa基質(zhì)勢(shì)區(qū)段的單位基質(zhì)勢(shì)平均含水率變化量分別為5.4×10-3、11.2×10-3和6.7×10-3cm~3/(cm~3·k Pa),最大差異性發(fā)生在-54.0~-42.0 k Pa之間,西藏地區(qū)的土壤水分特征曲線形狀主要決定于黏粒質(zhì)量分?jǐn)?shù),而砂粒質(zhì)量分?jǐn)?shù)則主要影響土壤水分特征曲線的變異性。van Genuchten模型和模擬6組試驗(yàn)數(shù)據(jù)的相對(duì)誤差平均值和最大值分別為0.04和0.09。采用Gardner-Russo模型模擬6組試驗(yàn)數(shù)據(jù)的相對(duì)誤差的平均值和最大值分別為0.06和0.14。van Genuchten模型模擬西藏林芝地區(qū)的土壤水分特征曲線的精度及有效性顯著超過(guò)Gardner-Russo模型。
[Abstract]:The natural climatic characteristics, the parent material and the conditions of soil-forming in Tibet have remarkable regional characteristics. Understanding the characteristics of soil hydrodynamics in the Tibetan Plateau is of great significance for the study of hydrology and water cycle processes in the plateau region. In 2015, Milin County (2 905 m),) and Linzhi County (3 240 m above sea level) were located in Milin County, Linzhi Prefecture, respectively. (3 879 m above sea level) field sampling in 3 highland barley planting areas, Based on the test of soil moisture characteristic curve of undisturbed soil, the relationship between soil matrix potential and soil moisture content in Linzhi region, Tibet, was studied, and the differential solution equation of parameters was established. The parameter estimation method of nonlinear function of soil moisture characteristic curve was developed, and the parameters of van Genuchten model and Gardner-Russo model were determined by using global optimal method to construct Jacobi matrix based on measured values. The results show that the average moisture content per unit matrix potential in the substrates potential range of -11.0 ~ 4.0 ~ 42.0 KPA and -54.0 ~ 42.0 KPA is 5.4 脳 10-3 脳 10-3 and 6.7 脳 10-3cm~3/ (cm~3 KPA), respectively. The maximum difference occurs between -54.0 KPA and 42.0 KPA, the results show that the average moisture content per unit matrix potential varies from -54.0 KPA to 42.0 KPA, and the variation of average moisture content per unit matrix potential is 5.4 脳 10-3 脳 10-3 and 6.7 脳 10-3cm~3/ (cm~3 KPA) respectively. The shape of soil water characteristic curve in Tibet is mainly determined by clay mass fraction. The relative error average and maximum value of the van Genuchten model and the six groups of simulated test data were 0.04 and 0.09, respectively. The accuracy and validity of the Gardner-Russo model for simulating the soil moisture characteristic curves in Linzhi region of Tibet were significantly higher than that of the Gardner-Russo model. The average and maximum values of the relative errors of the six groups of experimental data were 0.06 and 0.06, respectively, and the 0.14.van Genuchten model was much more accurate and effective than the Gardner-Russo model.
【作者單位】： 西藏農(nóng)牧學(xué)院;
【基金】：西藏自治區(qū)科技廳農(nóng)牧業(yè)科技成果轉(zhuǎn)化與示范項(xiàng)目;西藏自治區(qū)科技廳科技重大專項(xiàng)(Z2016C01G01/07) 國(guó)家重點(diǎn)研發(fā)項(xiàng)目(2016YFC0402405) 國(guó)家自然科學(xué)基金項(xiàng)目(51379152,91647109,51679257)
【分類號(hào)】：S152.7

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本文編號(hào)：2106613