蒸发和灌水频率对土壤中NO_3^-运移影响的研究  

Effects of Evaporation and Irrigation Frequency on Soil NO_3^- Transport

作　　者：曹红霞[1] 康绍忠[1] 李天军[1] 

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,陕西杨凌712100

出　　处：《灌溉排水学报》2007年第6期44-46,共3页Journal of Irrigation and Drainage

基　　金：国家自然科学基金重点项目(50339030);西北农林科技大学科研专项

摘　　要：通过室内均质土柱试验,对不同灌水频率下有、无蒸发土壤中NO3-运移规律进行了研究。结果表明,有、无蒸发条件下土壤NO3-峰均随灌水频率增加而变陡、变窄,峰值增高,向下运移变缓;随灌水频率增加蒸发条件下溶质峰和溶质锋深度明显浅于无蒸发条件;蒸发量越大,灌水频率越高,有效淋洗水量越少;灌水间隔期蒸发与灌水淋洗共同决定着不同灌水频率土壤中溶质的运移和分布。NO3^- transport in soils with or without evaporation under different irrigation frequencies was investigated through disturbed soil columns in lab. Results show NO3^- solute peaks in soil with or without evaporation all will get steeper, narrower, higher peak values and slower movement downward, and the depths of NO3^- solute peak and front is obviously shallower with evaporation than without evaporation as irrigation frequency increased. The effective water amount for leaching becomes less with stronger evaporation and higher irrigation frequency. The evaporation during intervals of irrigation and leaching decide the NOO3^- transport and distribution in soils with different irrigation frequencies.

关 键 词：蒸发 灌水频率 溶质运移 溶质峰 溶质锋 

分 类 号：S153[农业科学—土壤学]