灌水量对土壤中污染物运移规律影响的研究  

Effect of different irrigation quantity on bromide transport in soil

作　　者：曹红霞[1] 康绍忠[1] 何华[2] 

机构地区：[1]西北农林科技大学教育部旱区农业水土工程重点实验室 [2]中国科学院水利部西北农林科技大学水土保持研究所,陕西杨陵712100

出　　处：《西北农林科技大学学报（自然科学版）》2002年第3期95-98,共4页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家杰出青年基金资助项目 (4 972 5 10 2 ) ;西北农林科技大学青年教师基金资助项目

摘　　要：以溴离子 (Br- )为示踪剂 ,对不同次灌水量 (30 ,6 0 ,90 m m)下均质扰动土柱中污染物运移规律进行了研究。结果表明 ,每 30 mm的有效灌水量使 Br- 浓度峰下移约 10 cm ,即污染物浓度峰的运移深度与有效灌水量成倍比关系 ,且可用简化的溶质运移模型估算 ;污染物再分布主要取决于灌水量、蒸发量、排水量三者之间的关系。因此 ,为了减少土壤中某些污染物 (如 NO- 3)的淋移 ,应尽可能适时。Studies of pollutant transport in disturbed columns were conducted under different irrigation treatments with bromide tracer.The results showed that the transport depth of bromide concentration peak has proportional relation with effective irrigation quantity,and can be estimated with simplified model of solute transport.Solute redistribution depends on the relationship between irrigation,evaporation and drainage amount.In order to reduce leaching of some pollutant (such as NO - 3) in soil,irrigation water should be applied with proper water amount at right time.

关 键 词：灌水量 土壤 污染物 运移规律 水污染预测 Br^-浓度峰 溶质运移 

分 类 号：S274.1[农业科学—农业水土工程]