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采用相关分析法与主成分分析法,研究了焉耆盆地典型区域土壤盐分特征。结果表明:研究区24.8%样地呈非盐渍化土壤,7.5%为轻度盐渍化,11.9%为中度盐渍化,13.6%为重度盐渍化,42.2%为盐土。土壤盐分含量大小与HCO3-、K+与Na+含量水平的高低有关。0~10 cm土壤平均含盐量占0~50 cm土层平均含盐量的50.09%,即土壤盐分垂直分布呈现强烈表聚性。主成分分析结果表明,含盐量、K++Na+、CO32-与HCO3-可作为研究区土壤盐渍化状况的特征因子。不同土地利用类型条件下,耕层土壤平均含盐量从高到低依次为:荒地、林地、旱田、菜地。不同时期耕层土壤平均含盐量从高到低依次为:春灌期、夏灌期、秋灌期。
Using correlation analysis and principal component analysis, the characteristics of soil salinity in typical areas of Yanqi Basin were studied. The results showed that 24.8% of the sample plots were non-saline soil, 7.5% were mild salinization, 11.9% were moderate salinization, 13.6% were severe salinization and 42.2% were salinized soil. The content of soil salinity is related to the level of HCO3-, K + and Na +. The average salt content in 0 ~ 10 cm soil layer accounted for 50.09% of the average salinity in 0 ~ 50 cm soil layer, that is, the vertical distribution of soil salinity showed strong surface aggregation. The principal component analysis showed that salt content, K ++ Na +, CO32- and HCO3- could be used as characteristic factors of soil salinization in the study area. Under different types of land use, the average salt content of topsoil in descending order was: wasteland, woodland, dry land and vegetable field. The average soil salt content of topsoil in different periods was in the order of spring irrigation, summer irrigation and autumn irrigation.