塔克拉玛干沙漠腹地人工绿地对沙地盐分时空分布的影响

Effect of Artificial Green Belt on Salt Distribution in Sand Land in Hinterland of Taklimakan Desert

对塔里木沙漠公路防护林地进行实地观测和试验 ,研究咸水灌溉条件下沙地盐分淋溶后在土壤中重新分配和运移的规律。结果表明 ,沙地可溶性盐灌溉淋溶与蒸发积累过程交替发生 ,时空分布上表现为年内根际各层土壤盐分含量逐渐降低 ,但随着土壤深度的增加 ,2 m以下土壤盐分增加。年际土壤各层盐分含量逐年减少 ,盐分被淋溶到地下水或下层土壤。土壤盐分分布状况是多种因素综合作用的结果 ,灌溉量、灌溉周期、灌溉方式。

An experiment was carried out to study salt distribution and movement in sand land in Tarim desert highway forest belt,irrigated with underground water of high mineral degrees.The experimental data show that salt movement in soil has seasonal rules,timely,salt accumulation and decreasing alternate with variation of season. Salt contents increase with the depth in soil within one year, but it does not result in salt accumulation extensively, in the meantime, salt contents in each layer of soil gradually decrease along with the lapse of time, a large quantity of salt is washed to underground water or the beneath layer of soil. The salt movement and distribution are up to many factors comprehensive action. Among them,irrigation quantity,irrigation interval,irrigation ways,soil texture feature,and topography conditions are main factors to influence salt movement and distribution.