摘要
土壤洗盐是盐碱地改良的重要手段,以大安灌区重度盐渍区为例,运用HYDRUS-1D模型对灌区土壤明渠排水洗盐过程中的水盐动态进行了研究,采用室内土柱灌水模拟洗碱过程的观测数据验证了模型的可行性。通过对大安灌区重度盐渍区3a的洗碱效果进行数值模拟,对泡碱洗盐过程中盐分运动规律进行了预测。结果表明,经过3a的明渠排水洗盐,大安灌区土壤表层40cm范围内含盐率降到了1%以下,其土壤含盐量已经降到了轻度盐化草甸土土壤含盐量的水平,可以进行水田种植;排水沟距应在100m左右为宜。
Soil salt leaching is an important method to improve the saline-alkali soil. In this paper, a severe Saline region of Daan irri- gation district is taken as an example and the HYDRUS-1D model is used to study the water and salt dynamic in the process of soil salt leaching through open channel drainage in the irrigation district. The observation data of using irrigating soil columns to simulate the alkali leaching process is used to verify the feasibility of the model. Through the simulation of the alkali leaching effect of three years in severe saline region of Daan irrigation district, the sah movement rule in the alkali leaching process is predicted. The result shows that after soil salt leaching through open channel drainage for three years, the salinity rate in the surface soil in the scope of 40 cm has dropped to less than 1 %, the salt content of soil has decreased to the level of slight-degree salinization meadow soil and can be used for paddy planting. The appropriate drains distance is 100 m.
出处
《节水灌溉》
北大核心
2014年第2期44-47,51,共5页
Water Saving Irrigation
