【摘要】 采用主成分分析方法对阿瓦提灌区土壤盐渍化状况进行了研究,结果表明,该地属于中重度硫酸盐盐渍地,0~30 cm耕作层含盐量在0.5%~4%之间,在灌区内部土壤盐分存在多次积盐和脱盐过程,耕作层第一、二主成分显著,累计贡献率高达90%,第一主成分综合反映灌区内土壤盐渍化程度,第二、第三主成分联合反映了土壤的碱性特征。更多还原

【Abstract】 The principal component analysis is used to study the soil salinization in Awati Irrigation District.The results show that the irrigation district is medium to heavy sulphate salinized,with salt content of 0.5%～4% in its top 30 cm cultivated layer,and the soil of the irrigation district has suffered multiple salinity accumulation and eluviations processes.The accumulated contribution rate of the first and second principal component is about 90% in cultivation layer.The first principal component denotes the degree of soil salinity,while the second and the third principal components indicate the degree of soil alkalinity.更多还原