干旱区研究2023，Vol.40Issue(11)：1785-1796,12.DOI:10.13866/j.azr.2023.11.08
宁夏红寺堡扬黄灌区土壤盐渍化特征
Soil salinization characteristics in irrigation region of Yellow River of Hongsipu,Ningxia
摘要
Abstract
To explore the main factors influencing soil salinization in irrigation region of Yellow River of Hongsipu,correlation analysis and principal component analysis were used to study the salinization characteristics of the 0-100 cm soil profile.The results showed the following:(1)The overall soil in the study area is strongly alkaline,with the pH of the lower layer of 20-100 cm soil being significantly higher than that of the upper layer of 0-20 cm(P＜0.05),which increases with increasing soil depth.The total salt content of soil also increases with increasing soil depth,showing a bottom aggregation-type profile feature of high at the bottom and low at the surface.The difference in total salt content of each layer of soil was not significant(P＜0.05),which the pH of each layer of soil exhibited weak variability,with a relatively uniform spatial distribution.The total salt content of soil in the upper layer showed moderate variability at depths of 0-20 cm,while in the lower layer of depths of 20-100 cm it showed strong variabilily,with differences in spatial distribution appearing with changes in depth.(2)The main cation in the study area is Na++K+,with significant differences in the content of each cation(P＜0.05).The main anion is SO42-,which significant difference compared with other anions(P＜0.05).The contents of the ions are in following order:SO42-＞Na+ +K+＞Ca2+＞Mg2+＞HCO3-＞Cl-＞CO32-,and the concentration of each ion also increases with increasing of soil depth,consistent with the changes in total salt and pH.(3)Through correlation analysis and principal component analysis,it was found that the main factors affecting total salt in the irrigation area are SO42-,Cl-,Na++K+,and Mg2+,while the main factors affecting pH are CO32- and HCO3-.The main salts are sulfate and chloride,but there are significant differences in salt types at different depth profiles.The upper layer of salt is mainly chloride,while the lower layer is a composite of sulfate and chloride.The results of this study prove the main factors affecting the soil salinity characteristics of irrigation region of Yellow River of Hongsipu,and provide a theoretical basis for the treatment of alkali soil in the study area.关键词
盐碱地/盐渍化特征/相关性分析/主成分分析/红寺堡扬黄灌区/宁夏Key words
saline-alkali land/salinization characteristics/correlation analysis/principal component analysis/irrigation region of Yellow River of Hongsipu/Ningxia引用本文复制引用
牛子路,王磊,齐拓野,张伊婧,申建香,杨竹青,王恩田,蒋淑汀..宁夏红寺堡扬黄灌区土壤盐渍化特征[J].干旱区研究,2023,40(11):1785-1796,12.基金项目
国家重点研发计划项目(2921YFD1900600) （2921YFD1900600）
宁夏回族自治区重点研发计划项目(2022BEG03053) （2022BEG03053）
