不同作物下的土壤水盐运动分析

通过１９９５，１９９６年在阿克苏水平衡试验站对不同种植作物的土壤水分，盐分取样分析，显示不同情况下盐分运动规律差异很大，呈现出干旱区土壤盐分含量高，活动强烈的特征。

ANALYSIS ON SALT MOVEMENT IN SOIL UNDER THE DIFFERENT CROPS

Salt movement in soil is strong in Tarim River Basin due to its extremely dry climate and violent evaporation. It causes a serious secondary salinization in the farm fields. A study on salt movement in the soil under cotton and rice was carried out at Aksu Station for water Balance Experiment and Study, Chinese Academy of Sciences during a period from 1995 to 1996. The results show that the patterns of salt movement in the soil are quite different from different crops and seasons: (1) During the earlier stage of cotton growth period, salt movement in soil is not obvious, while during the rice planting period,salt content in soil is obvious1y lowered due to the sa1t washing form an intensive irrigation 5 (2) During the irrigation period of cotton, salt in soil moves strongly within a lager of 0~ 50cm, and it congregates towards the dense area of roots within a lager of 20~4ocm; (3) During the crop-free period in winter and spring without irrigation, salt returns to surface soil again, and its returning ratio is higher in rice field than that in cotton field. The results of this study have an important significance for controlling salt returning and secondary salinization'of soil.