吐鲁番市非灌溉期农田土壤盐分特征分析

摘要

The soil samples were collected along the up ,middle and downstream irrigation districts of the Turpan City’s four rivers as Daheyan ,Tallang Meiyaogou and Heigou River ,to measure the soil salt and main ion content and analyze the type of soil salinization ,degree and the correlation between soil salt content and main ion in non irrigation pe-riods (March and October ) ,along the four rivers of Turpan City .The results showed that:The soils in research area have partly appeared the tendency of soil salinization ,also the soil secondary salinization trends was rather higher .The soil salt content had a close relationship with each ions (i .e .CL- 、CO3 - 、HCO3 - 、SO42- 、K+ 、Na+ 、Ca2+ 、Mg2+) in Tur-pan City .According to the salt distribution in soil profile ,the soil salt had the surface accumulation .The main compo-nent of the soil salinization was the sulfate saline soil in four river’s irrigation districts .%对吐鲁番市的大河沿河、塔尔朗河、煤窑沟和黑沟上、中、下游灌区进行土样采集，测定吐鲁番市沿四条河流在非灌溉期内（3月、10月）土壤含盐量及主要离子含量，并分析土壤盐渍化类型、程度及土壤盐分与主要离子之间的相关关系。结果表明：研究区土壤有部分出现盐渍化趋势，且土壤次生盐渍化趋势较高；吐鲁番市土壤含盐量高低与各离子（即CL－、CO3－、HCO3－、SO42－、K＋、Na＋、Ca2＋、Mg2＋）含量大小有密切的关系；土壤盐分剖面分布具有表聚型；四条河流灌溉区土壤盐渍化类型的主要成分为硫酸盐渍土。