地质高背景区土壤硒镉的伴生关系及作物吸收  

Soil Cd and Se Associated Relationship and Crop Absorption in Geological High Background Area

作　　者：王锐 王佳彬 蒋玉莲 朱世林 周皎 贾中民 WANG Rui;WANG Jiabin;JIANG Yulian;ZHU Shilin;ZHOU Jiao;JIA Zhongmin(Southeast Sichuan Geological Group,Chongqing Bureau of Geology and Minerals Exploration,Chongqing 400038,China;Chongqing Key Laboratory of Land Quality Geological Survey,Chongqing 400038,China)

机构地区：[1]重庆市地质矿产勘查开发局川东南地质大队,重庆400038 [2]重庆市土地质量地质调查重点实验室,重庆400038

出　　处：《土壤》2024年第6期1339-1346,共8页Soils

基　　金：渝规资[2022]61-9-2号;重庆市地矿局川东南地质大队自立科研项目(CDNKY-2023003)资助

摘　　要：以重庆市黔江区为例,开展地质高背景区土壤硒(Cd)、镉(Se)的来源、伴生关系及作物吸收研究,结果显示:研究区土壤Se资源丰富,土壤Cd超过筛选值和管制值的比例分别为30.81%和1.74%,且土壤以酸性为主;土壤Se、Cd含量主要受到二叠系、泥盆系及寒武系地层分布的影响,在志留系地层中,农业活动也对土壤Cd含量具有一定的影响;土壤中Cd和Se伴生及表层富集现象明显,可能与土壤中黏土矿物、有机质及铁锰氧化物的吸附作用有关。土壤铁锰氧化物及有机质含量对水稻Cd和Se的吸收有抑制作用,土壤pH是影响水稻Cd、Se吸收的关键因子,碱性条件下水稻对Cd的吸收降低但有利于水稻对Se的吸收,因此,土壤pH调节是富Se资源安全开发的关键。Taking Qianjiang District of Chongqing City as an example,this paper studied the source,associated relationship and crop absorption of soil Cd and Se in the high geological background area.The results showed that soil Se resources were abundant in the study area,the proportions of soil Cd exceeding the selected value and the controlled value were 30.81%and 1.74%,respectively,and soil was mainly acidic.Soil Se and Cd contents were mainly affected by the distribution of Permian,Devonian and Cambrian strata,and in Silurian strata,agricultural activities had a certain influence on soil Cd content.The associated and surface enrichment of Cd and Se in soil were obvious,which may be related to the adsorption of clay minerals,organic matter and Fe/Mn oxides in soil.The contents of Fe and Mn oxides and organic matter in soil inhibit Cd and Se absorption in rice,and soil pH is a key factor affecting the absorption of Cd and Se in rice.Alkaline conditions could reduce Cd absorptionand and promote Se absorption by rice.Therefore,the regulation of soil pH is key to the safe development of Se-rich resources.

关 键 词：硒 镉 来源 伴生关系 作物吸收 影响因素 

分 类 号：X171.5[环境科学与工程—环境科学]