【摘要】：為研究吉林西部土壤貯水能力的空間分布特征和水分有效性,以吉林西部大安灌區(qū)為研究對(duì)象,通過(guò)試驗(yàn)測(cè)定土壤貯水量及根系區(qū)土壤的水分特征曲線,并利用van Genuchten模型進(jìn)行水分特征曲線擬合,結(jié)合經(jīng)典統(tǒng)計(jì)和地統(tǒng)計(jì)分析方法分析土壤貯水量空間變異特征。結(jié)果表明:鹽堿土和非鹽堿土吸持貯水量、滯留貯水量和飽和貯水量的均值之間不存在顯著性差異(P0.05),實(shí)際貯水量均值存在顯著差異(P0.05);土壤實(shí)際貯水量呈現(xiàn)由西向東、由北向南逐漸升高的變化趨勢(shì),且南北方向的空間變異性均高于東西方向的空間變異性;輕度鹽堿地、水田和旱田實(shí)際有效含水量分別占其最大有效含水量的78.94%、58.28%和56.62%,水分有效性較高,蔬菜地、高粱地、草甸土以及中度和重度鹽堿土實(shí)際有效含水量占其最大有效含水量的20.83%27.13%,土壤水分有效性較小;水田、輕度和中度鹽堿地的貯水和持水能力強(qiáng),旱田和蔬菜地土壤貯水能力較強(qiáng),持水能力中等,而重度鹽堿地、高粱地、草甸土等土壤的持貯水能力較弱。研究結(jié)果對(duì)旱改水工程水資源管理和預(yù)防次生鹽漬化有重要意義。
[Abstract]:In order to study the spatial distribution characteristics and water availability of soil water storage capacity in western Jilin Province, the soil water storage capacity and soil moisture characteristic curves of root area were measured by experiments. The van Genuchten model was used to fit the water characteristic curve and the spatial variation characteristics of soil water storage were analyzed by classical statistics and geostatistical analysis. The results showed that there was no significant difference in the mean value of retained water and saturated water storage between saline and non-saline soils (P0.05), but there was significant difference in the mean value of actual water storage (P0.05), and the actual soil water storage appeared from west to east. The spatial variability in the north and south direction is higher than that in the east and west direction, and the spatial variability in the light saline-alkali soil is higher than that in the east-west direction. The actual effective water content in paddy field and dry field accounted for 58.28% and 56.62% of the maximum effective water content, respectively. The actual effective water content of meadow soil and moderate and severe saline-alkali soil accounts for 20.83% of the maximum available water content, and the soil moisture availability is relatively small, while the water storage and water holding capacity of paddy field, mild and moderate saline-alkali soil is strong, and that of dry and vegetable soil is stronger. The water holding capacity of soil was moderate, but that of heavy saline-alkali soil, sorghum soil and meadow soil was weak. The results are of great significance to the management of water resources and the prevention of secondary salinization.
【作者單位】： 吉林大學(xué)地下水資源與環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室/吉林大學(xué)環(huán)境與資源學(xué)院;山東省水利科學(xué)研究院;山東省水資源與水環(huán)境重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41072255) 吉林省自然科學(xué)基金項(xiàng)目(20150101116JC)~~
【分類(lèi)號(hào)】：S152.7

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