民勤绿洲土壤水盐空间分布特征及盐渍化成因分析  

Spatial distribution of soil water and salt contents and reasons of saline soils’ development in the Minqin Oasis

作　　者：陈丽娟[1] 冯起[1] 成爱芳[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,兰州730000

出　　处：《干旱区资源与环境》2013年第11期99-105,共7页Journal of Arid Land Resources and Environment

基　　金：国家自然基金重点项目(91025002);国家自然基金面上项目(30970492);国家科技支撑计划课题(2012BAC08B05)资助

摘　　要：根据2010年民勤绿洲230个采样点的土壤水盐分析资料,运用传统统计学和地统计学分析方法对该地区土壤水盐空间分布特征及土壤盐渍化成因进行了研究。结果表明:民勤绿洲土壤水分整体呈现出西南高、东北低的趋势;土壤含盐量呈现出从南到北、由西到东逐渐增大的趋势,沿坝区至湖区,土壤浸提溶液电导率从0.07dS/m增加到5.99dS/m;根据土壤盐渍化分级标准,民勤绿洲非盐渍化土占区域总耕地面积的50.01%,轻、中、重度盐渍化土分别占19.13%、10.44%和16.96%;分析认为,干旱的气候、丰富的盐分来源、高矿化度地下水的存在以及人类不合理的水土资源利用方式是引起民勤绿洲土壤盐渍化的主要原因。Data of water and salt of 230 samplingsites in the Minqin oasis were available in 2010,allowing us to investigate spatial distributional characteristics of soil water and salt contents,characterize the distribution of saline soils,and identify potential reasons of soil salinization using statistical and geostatistical techniques.Our results indicated that the soil water content was higher in southwest and lower in northeast.The soil salt content was higher in south and west and lower in north and east.From Baqu to Huqu,the value of EC1：5 increased from 0.07 dS/m to 5.99dS/m.According to classification of salinization,no-salinizationed soils occupied 50.01% of overall plough area and the light,moderate and severe salinizationed soils occupied 19.13%,10.44% and 16.96%,respectively.Drought climatic conditions,rich salt origins,saline groundwater and unreasonable human activities have had a vital impact on the development of soil salinization.

关 键 词：民勤绿洲 土壤水分 土壤盐分 

分 类 号：S156[农业科学—土壤学]