宽膜覆盖下土壤环境研究 Ⅰ.土壤盐分运移分布特点

通过在新疆巴楚县设置不覆膜露地种植、窄膜覆盖和宽膜覆盖种植棉花的试验，对露地、窄膜下、宽膜中区和边区下不同时间的土壤剖面上全盐含量的比较分析，发现覆盖宽膜后第一水前盐分在土壤剖面上是增加的，但膜中区０～１５ｃｍ盐分　增加量小于膜边区；到收获后膜中区０～１５ｃｍ土壤含盐量下降到低于播种时水平，可是在膜　边区０～１５ｃｍ盐分聚积，含盐量继续增加；到收获后宽膜下１５～１００　ｃｍ深度内含盐量均降低　到春季播种时水平．

Study of Ecological Factors in Soil Mulched with Wide Plastic FilmⅠ.Characteristics of Soil Salt Distribution

A cotton experiment, including not mulching, mulching with narrow plastic film and with wide film, was car- ried out in slightly saline soil in Bachu County, Xinjiang. Soils were sampled from profiles of not mulched, mulched with narrow film, central zone and edge zone of mulched farmland with wide film at different time. Soil salinity was tested. It was found, after mulching with wide film, that salinity in soil profile increased before the first irrigation, and increase val- ue in 0-15cm layer at central zone was less than at edge zone; after harvest salinity in 0-15cm layer at central zone de- creased to be less than the level when sowing, but it increased at edge zone. Furthermore, salinity in layers below 15cm decreased to the level when sowing in spring.