紫阳县土壤硒的分布特征研究  

Distribution of Soil Total Selenium in Ziyang,Shaanxi

作　　者：张建东[1] 王丽[1] 王浩东[1] 雒昆利[2] 吴邦朝 

机构地区：[1]安康学院,陕西安康725000 [2]中国科学院地理资源与科学研究所,北京100101 [3]陕西地矿局第一地质队,陕西安康725000

出　　处：《土壤通报》2017年第6期1404-1408,共5页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(41172310);陕西省教育厅项目(12JK0477);安康市科研项目(2015AK05-05)资助

摘　　要：为了探讨紫阳县土壤硒含量水平及分布特征,采集了859个表层土壤样品,用原子荧光分析了其硒含量,在GS+软件中构建了变异函数,用GIS软件绘制了紫阳县土壤全硒含量分布图,同时分析了该区土壤硒含量水平、分布特征及与地层的关系。结果表明:研究区最低土壤硒含量0.0015 mg kg^(-1),最高硒含量36.6854 mg kg^(-1),平均值0.9429 mg kg^(-1),变异系数2.21,土壤硒含量服从对数正态分布,变程3900 m,块金值为0.0273,空间异质性指数为0.108,说明研究区土壤硒含量的变异主要是由结构性因素引起的,空间自相关性强。土壤中硒含量变化范围大,分布不均匀,中间较低,南北高,呈现出两条连续分布的富硒区,占紫阳县总面积的71.7%,富硒区分布与寒武-奥陶-志留系(除梅子垭组)的黑色含碳岩系分布一致,是富硒区土壤硒的主要来源。To study the distributi characteristics of soil selenium in Ziyang,Shaanxi,859 samples were collected from surface soil,and Hydride Generation Atomic Fluorescence Spectrometry（HG-AFS） was used to analyze selenium content.The variation function was constructed with GS＋ software,distribution map of soil total selenium content in Ziyang was drawn by ArcGIS software,and soil selenium content and distribution characteristics and its relationship with stratum were analyzed in the area.The results showed that the contents of soil selenium ranged from 0.0015 to36.6854 mg kg^-1,with an average of 0.9429 mg kg^-1.It showed lognormal distribution with the rang（R） of 3900 m,the nugget of 0.0273 and the spatial heterogeneity index of 0.108.This indicated that the variation in total selenium content mainly was caused by structure factor,and there was a strong spatial autocorrelation.Soil selenium content was largely varied and was high in the north and south regions,low in the middle region of Ziyang.It presented two continuous distribution of selenium-rich area,accounting for 71.7% of total area in Ziyang.The distribution of black carbonaceous rocks in Cambrian-Ordovician-Silurian（except Meiziya group） was consistent with the distribution of selenium enriched area and it was the main source of selenium in this area.

关 键 词：紫阳县 土壤硒含量 分布特征 GS+ ARCGIS 

分 类 号：S147.2[农业科学—肥料学]