贵州省开阳县耕地土壤与农作物硒地球化学特征及其影响因素  

The Selenium Geochemical Characteristics of Cultivated Soil and Farmland Crops and Its Influencing Factors in Kaiyang County,Guizhou Province

作　　者：郭永福 何承真 王金元 任文林[1] 周国正[1] 周忠清 GUO Yong-fu;HE Cheng-zhen;WANG Jin-yuan;REN Wen-lin;ZHOU Guo-zheng;ZHOU Zhong-qing(Team 159,Guizhou bureau of coalfield geology,Guiyang 550081,Guizhou,China)

机构地区：[1]贵州省煤田地质局159队,贵州贵阳550081

出　　处：《贵州地质》2020年第4期518-525,共8页Guizhou Geology

基　　金：黔地矿耕调2017-01、黔地矿耕调2017-02项目资助。

摘　　要：本次研究在开阳县采集6836件耕地表层土壤样、160件农作物样和160件根系土样。耕地表层土壤Se含量变化范围较大,介于0.09~7.38 mg/kg之间,背景值为0.53 mg/kg。耕地土壤硒地球化学等级以二级(0.5<Se≤0.8 mg/kg)、三级(0.4<Se≤0.5 mg/kg)和含硒为主(0.2<Se≤0.4 mg/kg),富硒耕地(0.4≤Se<3.0 mg/kg)面积为88.05万亩。耕地土壤中硒含量受地层控制明显,其中碳酸盐岩(灰岩、白云岩)、碎屑岩(砂岩、泥岩、炭质页岩)形成的土壤富硒含量较高。土壤类型差异对耕地土壤硒地球化学特征影响较小。农产品中茶叶和油菜籽具有良好的富硒效应,李子和枇杷富硒能力较弱。不同耕地土地利用类型中茶园的土壤硒含量最高,农产品富硒情况与根系土富硒情况及作物种类有关。In this paper,6836 top soil samples of arable land,160 crop samples and 160 root soil samples were collected in Kaiyang county.The Se content of the surface soil of cultivated land has a wide range of variation,ranging from 0.09 to 7.38 mg/kg,with a background value of 0.53 mg/kg.The selenium geochemical grades of cultivated soil are mainly grade two(0.5<Se≤0.8 mg/kg),grade three(0.4<Se≤0.5 mg/kg)and containing selenium(0.2<Se≤0.4 mg/kg),rich in selenium The area of arable land(0.4≤Se<3.0 mg/kg)is880500 mu.Tea and rapeseed in agricultural products have a good selenium-enriching effect.All tea and most rapeseeds meet the dye limit requirements of the National Food Safety Standards.The selenium content in cultivated soil is obviously controlled by the strata.Among them,the soil formed by carbonate rocks(limestone,dolomite)and clastic rocks(sandstone,mudstone,carbonaceous shale)has higher selenium content.Differences in soil types have little effect on the selenium geochemical characteristics of cultivated soils.The soil selenium content of tea gardens is the highest among different cultivated land use types,and the selenium enrichment of agricultural products is related to the selenium enrichment of root soil and crop types.

关 键 词：耕地 硒元素 影响因素 富硒农产品 开阳县 贵州 

分 类 号：P652[天文地球—地质学] S159[农业科学—土壤学]