水利学报Issue(2)：127-137,11.DOI:10.13243/j.cnki.slxb.2015.02.001
半湿润灌区控制排水条件下降雨洗盐计算模型研究
An analytical model for studying the effect of rainfall on salt leaching under controlled drainage in subhumid irrigation areas
摘要
Abstract
Properly raise water table with controlled drainage may increase shallow groundwater which can be used by crops,mitigating the water shortage in subhumid irrigated areas. However,salinity in groundwa⁃ter over there is generally higher, and increasing use of shallow groundwater may speed up salt accumula⁃tion in the root zone and shorten the salt leaching cycle;this is not desired in these areas because the leaching water can hardly be ensured during the required period. Considering in the subhumid irrigation ar⁃eas there are certain amount of rainfall that may produce leaching effect for salinity control, an analytical model was developed for calculating salt leaching cycle under controlled drainage. The model was tested subsequently through a case study in a subhumid irrigation area in which soil was reclaimed from saliniza⁃tion. With the daily water balance predicted by the field hydrology model-DRAINMOD, we calculated the salt accumulation in the root zone over a long term period (1951-2005) under controlled drainage and dif⁃ferent supplemental irrigation depths. The results show that when groundwater depth is controlled at 1.2 m, rainfall has some effect on salt leaching even without irrigation;but soil salinity grows with time in the root zone. When the supplementary irrigation depth is greater than 150 mm, rainfall can effectively control the root zone salinity to reach a favorable salt balance in the case study area. Findings from this research indicate that in subhumid irrigation areas, considering the leaching effect of rainfall, proper water table management with controlled drainage can effectively control soil salinity for crop production and improve wa⁃ter use efficiency.关键词
盐分控制/降雨淋洗模型/DRAINMOD/控制排水Key words
salinity control/rainfall leaching model/DRAINMOD/controlled drainage分类
资源环境引用本文复制引用
李山,罗纨,贾忠华,唐双成,武迪..半湿润灌区控制排水条件下降雨洗盐计算模型研究[J].水利学报,2015,(2):127-137,11.基金项目
国家自然科学基金资助项目（51279159，51079122）；水利部公益性行业科研专项 （）
