民勤绿洲灌区表层土壤盐分空间变异性研究  

Spatial distribution characteristics of topsoil salinity in the Minqin oasis,Northwest China

作　　者：李会亚[1,2,3] 冯起[1,2] 陈丽娟[1,2] 赵玉[1,2,3] 朱猛[1,2,3] 

机构地区：[1]中国科学院西北生态环境资源研究院,兰州730000 [2]中国科学院内陆河流域生态水文重点实验室,兰州730000 [3]中国科学院大学,北京100049

出　　处：《干旱区资源与环境》2017年第4期136-141,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金(31370466;41501113);中科院寒旱所青年人才成长基金(Y451051001)资助

摘　　要：土壤盐渍化是干旱半干旱区土地退化的主要原因之一,揭示土壤盐渍化程度与空间分布特征是区域盐渍化防治与治理的重要依据。文中以民勤灌区表层土壤盐分数据为基础,结合经典统计学与地统计学方法,研究该区土壤全盐及盐基离子的空间变异特征和分布规律。结果表明:该区表层土壤总体上偏碱性,阳离子以Na^+为主,阴离子以SO_4^(2-)为主,Cl^-和HCO_3^-离子呈中等变异性,而全盐和K^+、Na^+、Ca^(2+)、Mg^(2+)、SO_4^(2-)离子则呈强变异性。全盐和各盐分离子均表现出强烈的空间相关性,空间自相关距离为4.62-11.13km,表明全盐及各离子在空间自相关范围内具有很大的相似性。Ca^(2+)、Mg^(2+)、SO_4^(2-)和Cl^-离子与全盐的空间分布具有较高的一致性,低值区集中在灌区西南部和北部中心地区,高值区主要分布于灌区中部、北部偏东和偏西的一些区域。Soil salinization is one of the main causes of land degradation in arid and semi-arid areas. It is an important basis to reveal the degree and spatial distribution characteristics of soil salinization. Based on the topsoil salinity data of Minqin irrigated areas,the spatial variability and distribution characteristics of the topsoil salinity and ions were studied by the method of classical statistics and geostatistics. The results showed that topsoil salinity of the study areas was mainly composed of Na^＋and SO4^2-. The content of Cl^-and HCO3^-showed moderate variation characteristics,while the total salt and other salt ions content showed strong variability. The total salt and all salt ions showed a strong spatial correlation,and the spatial autocorrelation distance was 4. 62-11.13 km,which indicated that the total salt and all salt ions had great similarity in the spatial autocorrelation. The distribution trends of total salt,Ca^2＋,Mg^2＋,Cl^-and SO4^2-were higher consistent,the low value areas were concentrated in southweat and north centra region,high value areas were mainly distributed in the middle areas,north east and north west areas of the irrigation area.

关 键 词：土壤盐分 空间变异性 地统计学 民勤 

分 类 号：S153[农业科学—土壤学]