摘要
携带大量盐分的低质水长期灌溉导致土壤存在极大的物理化学特性退化风险,为了探究盐分对土壤水分特征曲线影响的差异性,采用压力膜法对亚热带地区粘性潮土、沙性潮土、红壤、紫色土、水稻土等5种土壤进行室内测定,对比分析了各土壤在0、5、10、15 g/L等4个钠盐浓度水平下土壤水分特征曲线的差异,并利用RETC软件结合数理统计方法确定了各土壤不同钠盐浓度水平下相应的最优拟合模型。结果表明:钠盐处理均可提高各土壤的持水能力,且粘粒含量较高的土壤影响显著;钠盐处理减少了粘性潮土、沙性潮土和红壤的有效含水率,分别最大减少了40.8%、30.5%、31.5%,却提高了紫色土、水稻土有效含水率,分别最大提高了45.7%、28.9%。粘粒含量少或低浓度盐溶液处理的土壤水分特征曲线以BC模型拟合最优,而粘粒含量多且高浓度盐溶液处理的以DP-M模型拟合最优。
Long-term irrigation of low quality water carrying large amounts of salt causes a significant degradation risk of soil physicochemical properties. The determination of difference in the influence of salinity on soil water characteristic curve of five subtropical soils, such as clay fluvo aquic soil, sandy fluvo aquic soil, red soil, purple soil and paddy soil, were investigated and these soils treatments with four different NaC1 solutions （0 g/L, 5 g/L, 10 g/L and 15 g/L） were prepared to obtain the soll water characteristic curves of drying processes by the pressure membrances method. The optimal models that described soil water characteristic curves of different salt concentration dealt soils were determined by RETC software and mathematical statistics method. The results showed that the sodium salt can improve the soil water holding capacity, and special significant effect for soil with high content clay. Available water contents of clay fluvo aquic soil, sandy fluvo aquie soil and red soil treated with NaC1 solutions treatments were maximally reduced by 40. 8% , 30.5% and 31.5% , respectively, and available water contents of purple soil and paddy soil were maximally increased by 45.7% and 28.9% , respectively. The Brooks and Corey model was the optimal model to describe the soil water characteristic curves of soils with less clay or treatments with salt solution of low concentration. The Dual - porosity - Mualem model was the optimal model for high clay content of the soils treated with salt solution of high concentration. The research results can serve as reference for the secondary salinization of soil, reclaimed water irrigation, calculation of water and salt transport in southern subtropics.
作者
胡传旺
王辉
武芸
卢佳宇
刘常
HU Chuanwang;WANG Hui;WU Yun;LU Jiayu;LIU Chang(College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China;College of Engineering, Hunan Agricultural University, Changsha 410128, China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2018年第4期290-296,329,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(41471185)
湖南省教育厅科学研究重点项目(15A084)
湖南省重点研发计划项目(2016JC2032)
湖南省研究生科研创新项目(CX2017B363)
