膜下滴灌土壤盐分特性及影响因素的初步研究

Salt Distribution and Effect Factors in Under Film Drip Irrigation

针对新疆盐碱地的改良特征 ,通过室内膜下滴灌土壤盐分运移试验 ,初步研究了土壤脱盐过程 ,滴头流量、灌水量等对脱盐过程的影响。结果表明 :膜下滴灌土壤盐分分布可划为达标脱盐区、未达标脱盐区及积盐区 3个区域 ;土壤含盐量分布具有水平脱盐距离大于垂直脱盐距离的特点 ;滴头流量、土壤初始含水量以及土壤初始含盐量的增加不利于达标脱盐区的形成 ;灌水量的增加有助于土壤脱盐。这些结果对膜下滴灌新技术开发利用盐碱地的生产实践具有指导意义。

The effects of under film drip irrigation operation parameters, such as discharge rate, water application per irrigation, on soil salt movement and distribution are investigated with a lab experiment. Results show that salt distribution in soil can be divided into three zones: desalted zone, partly desalted zone and salt accumulation zone. High discharge rate, high initial soil moisture content and initial soil salt content will hinder formation of complete desalted zone, but increasing water application per irrigation is benefit for formatting desalted zone.