论文部分内容阅读
针对新疆土壤盐碱化开发利用和防止土壤次生盐渍化的问题,通过对不同年限的棉田膜下滴灌土壤盐分的运移研究,从土壤空间、棉花生育期两个方面对不同年限土壤盐分进行分析,初步得出:滴灌前,土壤垂直方向上盐分变化幅度大;滴灌后,垂直方向0～40 cm处于脱盐,60～100 cm表现为积盐。灌前和灌后在土壤水平方向和垂直方向含盐量高低变化是膜中滴头处低于棉花窄行,两者且低于膜间裸地。在棉花生育期内,播种前土壤含盐量较高,苗期含盐量降低,从蕾期到盛铃期土壤盐分逐渐升高,随后吐絮期至收获期逐渐减小。在不同年限棉田监测中,随滴灌年限的增加,土壤耕层盐分逐渐运移到土壤深层,土壤盐分经较长年限逐渐累积。
In order to solve the problem of soil salinization in Xinjiang and to prevent secondary salinization of soil, this paper studied the effects of drip irrigation under sub-layer drip irrigation on the salt content in soils with different years from soil space and cotton growth period The results showed that before drip irrigation, the vertical variation of salinity in soil was large. After drip irrigation, desalination in the vertical direction of 0-40 cm and salt accumulation in 60-100 cm. The changes of salinity in the soil horizontal and vertical directions before and after irrigation were the lowest in the drip head at the membrane and the narrower ones in the membrane, both of which were lower than those between the membranes. During the cotton growing period, soil salinity before sowing was higher, salinity decreased at seedling stage, soil salinity gradually increased from bud stage to rhizobium stage, then decreased gradually from boll stage to harvest stage. During the monitoring of cotton fields with different years, with the increase of drip irrigation years, salt in soil topsoil gradually migrated to the deep soil layer, and soil salinity gradually accumulated over a longer period of time.