摘要
为查明塔里木盆地东南缘绿洲区土壤硒含量状况,采集分析3576组表层土壤样品,调查土壤硒的空间分布特征,运用地统计学与空间自相关理论相结合的方法,对土壤硒空间分布及影响因素进行分析。结果表明:塔里木盆地东南缘绿洲区表层土壤Se含量整体较低,农用地的土壤Se含量高于非农用地的土壤硒含量,范围为0.06~1.10mg/kg,土壤采样点达到富硒标准的个数为77个,占本次采样点个数的2.2%,其中农用地富硒采样点个数为52个,占本次采样点个数的1.5%,富硒土地面积为152km^(2);土壤硒元素含量的理论变异函数模型主要为高斯模型和指数模型,土壤硒含量高值区呈片状集中或岛状零散分布,含量差异较大;土壤硒空间自相关性表现为空间正相关(Moran’s I>0),聚集类型为高-高型、低-低型、低-高型和高-低型等4种;研究区表层土壤硒含量主要受pH和有机质的影响,同时还受Al_(2)O_(3)、Fe_(2)O_(3)、SiO_(2)、Na_(2)O、CaO、MgO等氧化物的影响,表层土壤硒含量会随着pH和SiO_(2)含量增加而显著减小。
In order to study the soil selenium content in the oasis area of the southeastern margin of the Tarim Basin,3576 sets of top soil samples were collected and analyzed to investigate the spatial distribution characteristics of soil selenium.Using the method of geostatistics and spatial autocorrelation theory,the spatial distribution of soil selenium and influencing factors were analyzed.The result showed that the content of Se in the Oasis region of southeastern Tarim Basin is relatively lower,ranging from 0.06 to 1.10 mg/kg.The Se content in the agricultural land in the study area is higher than that in the non-agricultural land.Selenium-rich top soil samples are 77,accounting for 2.2%of the all samples.Among them,the number of selenium-rich sampling points in agricultural lands are 52,accounting for 1.5%of the all sampling points.The area of selenium-rich land is 152 km^(2).The theoretical variation function models of soil selenium element content are mainly Gaussian model and exponential model.The areas with higher value of soil selenium are concentrated in flakes or scattered in islands,and selenium content differences are larger.The spatial autocorrelation of soil selenium shows a positive spatial correlation(Moran’s I>0),and the aggregation types are high-high,low-low,low-high and high-low.Selenium content of the top soil in the study area is mainly affected by pH and organic matter,as well as metallic oxide,including Al_(2)O_(3),Fe_(2)O_(3),SiO_(2),Na_(2)O,CaO,MgO,etc.Selenium content of top soil decreases significantly with the increase of pH and SiO_(2) content.
作者
陈云飞
周金龙
胡艳
曾妍妍
王松涛
CHEN Yunfei;ZHOU Jinlong;HU Yan;ZENG Yanyan;WANG Songtao(Tuojiang River Basin High-Quality Development Research Center,Neijiang Normal University,Neijiang 641100;College of Water Conservancy and Civil Engineering of Xinjiang Agricultural University,Urumqi 830052;Xinjiang Hydrology and Water Resources Engineering Research Center,Urumqi 830052;Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention,Urumqi 830052;No.2 Hydrogeology and Engineering Geology Team,Xinjiang Bureau of Geology and Mineral Resources Exploration and Development,Changji 831100,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2022年第4期73-79,共7页
Journal of Arid Land Resources and Environment
基金
中央返还两权款资金项目(S15-1-LQ)
内江师范学院校级课题(2020YB31)资助。
关键词
土壤硒含量
空间分布
影响因素
塔里木盆地东南缘绿洲区
soil selenium content
spatial distribution characteristics
influencing factors
oasis region of the southeastern Tarim Basin
