基于HYDRUS-2D滴灌棉田不同深度排盐沟土壤水盐运移的试验及模拟  

Experiment and simulation on salt removing of drip irrigation under the film in cotton field

作　　者：李卓然[1] 虎胆.吐马尔白 由国栋[1] Li Zhouran;Hudan·Tumarba;You Guodong(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《石河子大学学报（自然科学版）》2018年第3期376-384,共9页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金(51469033);河海大学国家重点实验室基金(2016490511)项目

摘　　要：针对膜下滴灌引起的盐分累计问题,为探求不同深度排盐沟对滴灌棉田土壤水盐运移规律的影响,设计测坑排盐浅沟滴灌棉花种植试验,通过建立HYDRUS-2D模型对10 cm深度排盐沟、30 cm深度排盐沟土壤水分、盐分运动规律进行模拟,利用土壤实测数据与对模拟结果进行验证。结果表明:土壤电导率受到排盐浅沟影响较为明显,排盐浅沟深度越大,排盐效果越明显;深度为30 cm排盐沟滴头处形成盐分淡化区域,排盐沟处0-15 cm土层盐分呈现不同程度积累;相对于深度为10 cm的排盐沟,30 cm深度排盐沟盐分聚集区更接近于土壤裸露处,有利于进一步开展大水洗盐、机械刮盐等工作;由于试验在测坑中展开存在一定人为因素,因此需继续开展大田试验,以期对结果进行充分验证。Targeting to the problem of salt accumulation in drip irrigation cotton fields, a cotton planting experiment with drip irrigation was designed to measure the depth of salt drainage in drip irrigation in order to explore the effects of different depths of salt drains on soil salt and water movement in drip-irrigated cotton fields. The HYDRUS-2 D model was established to simulate soil moisture and salinity in salt drainage ditch with a depth of 10 cm and 30 cm, and the measured results was used to verify the simulation results. The results showed that the soil electricity conductivity was affected by the salt drainage ditch. There is a obvious phenomenon of salt elimination with increasing deep of ditch. The salt desalination area is formed at the 30 cm salt drainage ditch, and the salinity in the 0-15 cm soil layer at the salt drainage ditch showed different degrees of accumulation. Compared with the 10 cm salt drainage ditch, the salt accumulation area at the 30 cm salt drainage ditch is closer to the bare soil, which is conducive to the further development of salt washing and mechanical scraping. Because there are human factors in the pit test, it is necessary to further carry out field tests in order to fully verify the results.

关 键 词：棉田 滴灌 排盐 数值模拟 HYDRUS-2D 

分 类 号：S275.6[农业科学—农业水土工程]