摘要
为进一步认识微咸水的入渗规律,采用室内土柱入渗试验,对比分析了不同矿化度(0,1,3,5g/L)的NaCl溶液加入湿润剂进行灌溉后盐碱土累积入渗量和入渗率随时间的变化,验证了在盐碱土中微咸水加湿润剂情况下不同公式描述入渗过程的适应性,并分析了全盐量和氯离子的剖面分布。结果表明:NaCl溶液添加湿润剂灌溉后,盐碱土的入渗能力随NaCl溶液矿化度的增加呈先增加后减小的趋势,入渗能力在NaCl溶液矿化度为3g/L时达到最大,超过3g/L后随NaCl溶液矿化度的增大而减小。湿润土层剖面含盐量及Cl-浓度在相同湿润锋随NaCl溶液矿化度的增加而增大,在湿润锋前达到最大。NaCl溶液矿化度为3g/L时,剖面含水率最大,其次是5,1,0g/L。4种不同矿化度NaCl溶液添加湿润剂条件下,Kostiakov公式的入渗率拟合值和实测值最为接近。
In order to comprehend soil infiltration characteristics of brackish water,the indoor soil column infiltration experiments were carried out to analyze the variations of the cumulative infiltration and infiltration rate of saline-alkali soil versus infiltration time after irrigation with NaCl solutions of different mineralization degrees（0g/L,1g/L,3g/L and 5g/L）added to Nalidet P-40,and the applicability of equations of soil infiltration in the saline-alkali soil was verified under infiltration of NaCl solution added to Nalidet P-40,and the distributions of total salt content and Cl-content in soil profiles were analyzed.The results indicated that under infiltration of NaCl solution added to Nalidet P-40,the saline-alkali soil infiltration ability increased first and decreased then with the increase of the mineralization degree of NaCl solution.Soil infiltration ability was the largest at the mineralization degree of 3g/L,but decreased with the increase of the mineralization of NaCl solution when mineralization degree was larger than 3g/L.At the same wetting front distance,both salt content and Cl-content in soil profiles increased with the increase of mineralization degree,and reached the top at the front of wetting front.At the same soil wetting layers,the water content in soil profiles was the largest when the mineralization degree of NaCl solution was 3g/L,followed by 5g/L,1g/L and 0g/L.Under irrigation of 4different mineralization degrees of NaCl solution added to Nalidet P-40,soil infiltration rates fitted by Kostiakov equation were the closest to the measured data in the experiments.
出处
《水土保持学报》
CSCD
北大核心
2016年第2期92-96,共5页
Journal of Soil and Water Conservation
基金
农业部作物需水与调控重点实验室2015年度开放课题项目(CWRR201501)
国家自然科学基金项目(51579213)
中国农业科学院科技创新工程农田灌溉研究团队项目
关键词
微咸水
湿润剂
灌溉
盐碱土
入渗
brackish water
Nalidet P-40
irrigation
saline-alkali soil
infiltration
作者简介
刘春成（1986-），男，安徽界首人，硕士，助理研究员，主要从事农业水资源的利用与保护以及灌溉理论和技术研究。E—mail：liuchuncheng986@sohu．com.
通信作者：高峰（1963-），男，博士，研究员，主要从事灌溉理论和技术研究。Email：gfyx@sina．com.
