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亮蓝示踪土壤水分运移的适宜浓度研究
Authors
华瑞
张少妮
徐学选
Publication date
1 January 2016
Publisher
Abstract
尽管亮蓝是一种广泛用于研究土壤水分运移的染色剂,但其自身的吸附作用是否影响水分自由运移、如何选 择适宜的染色浓度等尚需研究。此次使用5种浓度的亮蓝溶液在3种土壤中进行土柱入渗试验,对比不同亮蓝浓度 下的稳定出流速率、水分穿透时间、湿润锋与染色峰偏离情况,寻求亮蓝染色剂在土壤水分运移示踪研究中的适宜浓 度。结果表明:(1)在0~2.0g/L浓度范围内,亮蓝染色剂的添加未影响到水向土体入渗行为,即亮蓝染色剂示踪土 壤入渗是可行的。(2)染色剂浓度为1.5g/L时,水分穿透土柱的时间、稳定出流速率最接近对照(0.0g/L),但各浓 度之间差异很小;而以染色锋面与水的湿润锋面之差计算的迟滞系数值判断,黑垆土适宜的亮蓝溶液为1.5g/L,黄 绵土1.5~2.0g/L和砂土2.0g/L浓度。(3)迟滞系数与土壤黏粒含量存在极显著正相关关系,有一定吸附能力的 亮蓝溶液更适合黏粒含量低的土壤。综合考虑,三类土壤采用1.5~2.0g/L染色浓度研究土壤水分运移是可行的。</p
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 12/06/2019