滨海盐渍土土壤水分特征曲线测定及拟合模型的比较

发布时间：2018-07-07 17:40

本文选题：滨海盐渍土 + 土壤水分特征曲线　；参考：《中国农村水利水电》2016年07期

【摘要】：测定滨海盐渍土的土壤水分特征曲线及相应的参数,为研究和模拟水盐运移提供可靠的参数依据。以中国科学院黄河三角洲滨海湿地生态实验站内的盐渍土为例,使用压力膜仪测定土壤吸力和水分的关系,根据Brooks-Corey、Gardner和van Genuchten 3种模型拟合土壤水分特征曲线,结果表明:van Genuchten模型拟合的精度最高,剖面五层土壤的决定系数都大于0.97,与试验点土壤质地无明显相关性,可以用于该地区的土壤水分特征曲线拟合;BrooksCorey和Gardner模型的拟合效果相似,且精度波动都很大,在砂性土范围内,决定系数大小与土壤物理性砂粒含量成反比,不适合用于由泥沙堆积而成的黄河三角洲地区的土壤水分特征拟合。van Genuchten模型拟合结果表明:不同土壤的水分特征曲线不同,同一质地类型的土壤具有相似的曲线形状;土壤颗粒的粒径组成和含盐量对土壤的持水性有很大的影响,土壤颗粒越大土壤持水性越差,土壤含盐量越高,土壤持水性越好。
[Abstract]:The soil water characteristic curve and corresponding parameters of coastal saline soil were determined to provide reliable parameter basis for studying and simulating water and salt migration. Taking the saline soil in the Yellow River Delta coastal wetland ecological experimental station of the Chinese Academy of Sciences as an example, the relationship between soil suction and water was measured by pressure film meter. The soil moisture characteristic curves were fitted according to three models, Brooks-Corey Gardner and van Genuchten. The results showed that the fitting accuracy of the 1: van Genuchten model was the highest, and the determination coefficients of the five layers of soil profile were all greater than 0.97, which had no obvious correlation with the soil texture of the test site. The fitting results of Brooks Corey and Gardner models could be similar to those of Brooks Corey model and Gardner model. In the range of sandy soil, the determining coefficient is inversely proportional to the soil physical sand content. The fitting results of van Genuchten model show that different soil moisture characteristic curves are different, and the soil of the same texture type has similar curve shape. The particle size composition and salt content of soil particles have great influence on soil water holding capacity. The larger the soil particle size, the worse the soil water holding capacity, the higher the soil salt content is, the better the soil water holding capacity is.
【作者单位】：长安大学环境科学与工程学院;中国科学院海岸带环境过程与生态修复重点实验室(烟台海岸带研究所);烟台大学生命科学学院;山东省滨海盐碱地水土环境工程技术研究中心;
【基金】：公益性行业(海洋)科研专项(201105020) 公益性行业(农业)科研专项经费项目(200903001) 中科院海岸研究所部署项目“黄河三角洲陆海界面过程、生态演变与修复技术” 国家科技支撑计划项目(2009BADA3B04)
【分类号】：S152.7

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