入渗水水质对土壤导水特性影响的试验研究

发布时间：2018-04-24 15:17

本文选题：圆盘入渗仪 + 土壤导水特性　；参考：《水土保持学报》2017年04期

【摘要】：为探究不同入渗水水质对土壤导水特性的影响,采用圆盘负压入渗法进行试验研究,选取两种水质(蒸馏水和自来水)对黄壤和红壤进行4个压力水头(0,-3,-6,-9cm)下的圆盘入渗试验。结果表明,随着入渗水电导率的增大,土壤入渗率、吸渗率及导水率均随之增大,且红壤在不同电导率的入渗水作用下土壤吸渗率的变化差异显著(P0.05)。在低水头压力下,两种水质入渗条件下测得的土壤导水率差异显著(P0.05);在高水头压力下,两种水质入渗下测得土壤导水率差异不显著,表明入渗水水质对土壤导水率的影响主要发生在低压力水头下即在细孔隙下的导水特性上。两种土壤的大孔隙与中等孔隙对水流贡献率随入渗水电导率的增大而增大,而小孔隙对水流贡献率随入渗水电导率的增大而减小,入渗水水质对红壤土不同级别孔隙水流贡献率的影响显著(P0.05)。研究分析相关参数的变化有利于探讨野外试验时入渗水水质对试验结果的影响,对于正确认识农田水文过程、开发利用劣质水资源、提高农业灌溉灌水质量和灌水效率等具有重要意义。
[Abstract]:In order to investigate the effect of different infiltration water quality on soil water conductivity, the disc infiltration experiment was carried out by using disc negative pressure infiltration method. Two kinds of water quality (distilled water and tap water) were selected to carry out the disc infiltration experiments on yellow soil and red soil under four pressure water head 0 ~ (-3) ~ (-3) ~ (-6) ~ (-1) ~ (-9) cm). The results showed that the infiltration rate, permeability rate and water conductivity of red soil increased with the increase of infiltration conductivity, and the difference of infiltration rate of red soil under different conductivity was significant (P 0.05). Under low water head pressure, the difference of soil water conductivity between two kinds of water quality infiltration conditions is significant than that under high water head pressure, but there is no significant difference in soil water conductivity under high water head pressure. The results showed that the effect of infiltration water quality on soil water conductivity mainly occurred under the low pressure water head, that is, the water conductivity under fine pores. The contribution rate of macropores and medium pores to water flow increases with the increase of permeation conductivity, while the contribution rate of small pores to water flow decreases with the increase of permeation conductivity. The effect of infiltration water quality on the contribution rate of pore flow in red loam soil is significant (P 0.05). The study and analysis of the change of relative parameters is beneficial to the discussion of the influence of infiltration water quality on the test results during field tests, and to the correct understanding of farmland hydrological process and the exploitation and utilization of inferior water resources. It is of great significance to improve the irrigation quality and irrigation efficiency of agricultural irrigation.
【作者单位】：河海大学南方地区高效灌排与农业水土环境教育部重点实验室;河海大学水利水电学院;溧阳市国土资源局;江苏省江宁区水利局;
【基金】：国家自然科学基金项目(41471180) 江苏省国土资源科技项目(KJXM2016009) 江苏省水利科技项目(2016053)
【分类号】：S152.72

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