盐渍化弃耕地土壤盐分动态及其影响因素

以干旱区盐渍化弃耕地分布的光板地(裸地),不同生长时期的猪毛菜(Salsola ferganica)、芦苇(Phragmitesaustralis)和盐穗木(Halostachys caspica)群落为研究对象,研究了准噶尔盆地南缘玛纳斯河灌区典型盐渍化弃耕地土壤盐分的动态特征,并讨论了影响土壤盐分积累和迁移的环境因素.结果表明:试验区不同植被条件下土壤盐分含量差异较大,土壤0～ 100 cm各层盐分均为中等强度的变异.在地理地形、地下水位、成土母质等一致的条件下,气候的干热变化影响着土壤盐分的季节性变化,植被、土壤质地、土壤水分状况等因素与盐渍化弃耕地土壤盐分积累和迁移关系密切.

Dynamic Change of Soil Salinity in Salinization Abandoned Farmland and Affecting Factors

The dynamic characteristics of soil salt in salinization abandoned farmland were studied under the covers of Salsola ferganica, Phragmites australis and Halostachys caspica in the irrigation area of arid Manas River in the southern margin of Junggar Basin, and the environmental factors which affect soil salt accumulation and migration were discussed. The results indicated that soil salt content was different greatly under different vegetation covers, the variation coefficients of soil salt content were moderated within 0-100cm depth. Under the same geographical terrain, groundwater level and soil parent material etc., climate change affected the seasonal change of soil salinity. The process of salt accumulation and migration was closely related with environmental factors such as vegetation, soil texture and soil moisture.