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引用本文:蒋茜,吴凤平,谭帅,等.积水入渗下非常规水矿化度对红壤水盐运移特征的影响[J].灌溉排水学报,0,():-.
JIANG Xi,WU Feng-ping,TAN Shuai,et al.积水入渗下非常规水矿化度对红壤水盐运移特征的影响[J].灌溉排水学报,0,():-.
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积水入渗下非常规水矿化度对红壤水盐运移特征的影响
蒋茜, 吴凤平, 谭帅, 王辉, 宋城业, 陈婷, 李芊芊, 孟志雄
湖南农业大学水利与土木工程学院
摘要:
【目的】本文为探讨非常规水矿化度对南方酸性红壤水盐运移特征的影响,【方法】采取一维垂直土柱入渗试验,以蒸馏水(CK)为对照,探究不同矿化度(1、2、3、5、10 g/L)非常规水入渗下南方红壤水分动态运移、水盐分布及土壤pH变化,并定量表征矿化度与入渗模型参数关系。【结果】1~10 g/L处理在入渗后期较CK抑制红壤水分入渗,同一时刻入渗表现为CK>1 g/L >5 g/L>2 g/L>3 g/L >10 g/L。5 g/L处理初始累积入渗量和持水能力显著高于其他处理(p<0.05),水分下渗速度随入渗历时增加明显减弱,单位时间湿润锋运移距离小于CK和1、2 g/L处理。Kostiakov公式较Philip方程能更精确描述1~3 g/L处理红壤累积入渗随时间变化,矿化度大于3 g/L时则相反。红壤累积入渗量与湿润锋运移距离之间可用线性关系描述,红壤持水能力、入渗模型参数与矿化度之间关系均满足三次多项式(R2>0.95,RMSE<0.06 cm)。5~25 cm范围1~5 g/L处理可增加0.09%~4.61%土壤平均含水量,各处理土壤EC值和Na+、Cl-离子含量随深度增加呈减小趋势,矿化度对25~40 cm范围土壤盐分的影响小于上层土壤。与CK相比,1~5 g/L处理加剧土壤酸化,10 g/L处理则增加土壤pH值。【结论】矿化度对土壤酸化和分散作用程度不同是造成酸性土壤水盐运移特征差异的原因,明确土壤水盐变化有助于南方地区非常规水灌溉红壤水盐运移模型构建。
关键词:  矿化度;红壤;一维入渗;入渗模型;水盐分布
DOI:
分类号:S273.5
基金项目:湖南农业大学青年科学基金项目(18QN21);湖南省教育厅科学研究项目(18C0156);湖南省大学生创新创业训练计划项目(S201910537011)
Effect of Salinity of Unconventional Water on Water and Salt Transport Characteristics of Red Soil under water Infiltration
JIANG Xi, WU Feng-ping, TAN Shuai, WANG Hui, SONG Cheng-ye, CHEN Ting, LI Qian-qian, MENG Zhi-xiong
College of Water Resources and Civil Engineering, Hunan Agricultural University
Abstract:
【Objective】To discuss the effect of unconventional water salinity on water and salt transport characteristics of acid red soil in southern China,【Method】one-dimensional vertical soil column infiltration experiment was conducted to investigate the dynamic water movement, water-salt distribution and soil’s pH change of southern Red Soil under unconventional water infiltration with different salinity (1, 2, 3, 5, 10 g/L), and quantitatively characterized the relationship between salinity and infiltration model parameters.【Result】compared with CK, 1~10 g/L treatment inhibited water infiltration of red soil at the later stage of infiltration. At the same time, the infiltration of CK>1 g/L>5 g/L>2 g/L >3 g/L>10 g/L was observed. The initial cumulative infiltration amount and water holding capacity of 5 g/L treatment were significantly higher than those of other treatments (p<0.05), the infiltration velocity decreased with the increase of infiltration duration, and the migration distance of wetting front per unit time was smaller than that of CK and 1, 2 g/L treatments. Kostiakov formula is more accurate than Philip"s equation to describe the cumulative infiltration of red soil with 1~3 g/L, but the opposite is true when the salinity is greater than 3 g/L. The relationship between the cumulative infiltration amount and the migration distance of wetting front can be described by linear relationship. The relationship between water holding capacity, infiltration model parameters and mineralization degree satisfies cubic polynomial (R2>0.95, RMSE<0.06 cm). The average soil water content was increased by 0.09% ~ 4.61% in the treatment of 1~5g/L in the range of 5~25 cm. The EC Value and Na+ and Cl- ion contents decreased with the increase of soil depth. The effect of salinity on soil salinity in the range of 25~40 cm was less than that of the upper soil. Compared with CK, 1~5 g/L treatment increased soil acidification, while 10 g/L treatment increased soil pH.【Conclusion】The different effects of salinity on soil acidification and dispersion are the reasons for the difference of water and salt transport characteristics of acid soil. It is helpful to establish water and salt transport model of red soil irrigated by unconventional water in southern China.
Key words:  Salinity; red soil; one-dimensional infiltration; water and salt distribution; infiltration model