四川省邻水县土壤及作物硒地球化学特征及其研究意义  

Geochemical Characteristics of Selenium in Soils and Crops and Its Research Significance in Linshui County,Sichuan Province

作　　者：武芝亮 李致坤 侯青叶[1] 杨忠芳[1] 余涛[1] 王珏 王琛 马旭东 WU Zhiliang;LI Zhikun;HOU Qingye;YANG Zhongfang;YU Tao;WANG Jue;WANG Chen;MA Xudong(School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《现代地质》2021年第6期1752-1761,共10页Geoscience

基　　金：中国地质调查局成都地质调查中心项目“四川广安综合资源环境地质调查”子项目“四川广安耕地区土地质量地球化学调查”(DD20190524-06)。

摘　　要：依据四川省邻水县西部地区3447件表层土壤样品、59套水稻及其根系土样品和59套玉米及其根系土样品的数据资料,研究了土壤Se含量分布特征,建立了水稻、玉米籽实Se含量与其根系土元素含量的关系模型,进行了富Se农作物产地规划。研究结果表明:研究区土壤硒元素含量主要受其成土母质控制,碳质页岩、灰黑色玄武岩、深灰色灰岩成土母质分布区土壤Se平均含量较高,而侏罗系和三叠系地层区土壤Se平均含量较低;研究区水稻、玉米籽实富Se率分别为33.9%和98.3%,且重金属含量不超标,具备开发富硒农产品的潜力。农作物籽实Se含量主要与根系土中Se、S和有机质含量有关,通过作物籽实Se含量预测模型规划出研究区富Se水稻种植区面积为727 hm^(2),富Se玉米种植区面积16385 hm^(2)。该认识为当地富硒农产品产地规划提供了科学依据,对提高农产品经济价值具有重要意义。In order to study the distribution characteristics of Se in soils in the western region of Linshui County in Sichuan Province and to plan the production area of Se⁃rich crops,3,447 top soil samples,59 sets of rice grain and corresponding root soil samples and 59 sets of maize grain and corresponding root soil samples in the study area were collected and measured.The distribution characteristics of Se content in top soils were summa⁃rized.Prediction models for crop grains were established based on the Se content in rice and maize grains and the element contents in their corresponding root soils.The production areas of Se⁃rich crops were planned.Re⁃search shows that Se content of soils in the study area are mainly controlled by soil parent materials.Se content in the soils derived from carbonaceous shale,grayish black basalt and dark gray limestone is higher,and Secontent in the soils from the Jurassic and Triassic strata is lower.The Se⁃rich rates of rice and maize grain sam⁃ples in the study area are 33.9%and 98.3%respectively,and the contents of heavy metals in rice and maize grains do not exceed the national food safety standard,which indicated that Se⁃rich crops planting could be de⁃veloped in the study area.Se contents of rice and maize grains are mainly related to the contents of Se,S and organic matter in the corresponding root soils.According to the prediction models,the planting area of Se⁃rich rice in the study area is 727 hectares,and the planting area of Se⁃rich maize for crop grains 16,385 hectares.This study provides a scientific basis for the planning of Se⁃rich crops in the study area,and is of great signifi⁃cance for improving the economic value of agricultural products.

关 键 词：表层土壤 Se元素 分布特征 富Se农作物 预测模型 四川邻水 

分 类 号：X142[环境科学与工程—环境科学] P597[天文地球—地球化学]