摘要
选择在重庆南川区采集大宗农作物水稻及根系土样品155件,另采集部分玉米、土豆、番茄、油菜、李子和猕猴桃及根系土样品进行测试分析,以生物富集系数表征元素的生物有效性,分析土壤理化性质、土壤组分、地质背景及作物种类等因素对Cd生物有效性的影响.结果表明,南川区水稻及根系土中均存在一定程度的Cd超标现象,且Cd生物有效性相对较低;土壤酸碱度为Cd生物有效性的主要控制因素,酸性条件下生物有效性更高;番茄、李子和猕猴桃对Cd的富集能力较弱.因此,可通过人工调控田块酸碱度或调整种植结构等手段预防土壤重金属污染、提高农产品质量.该方法亦可用于其它土壤重金属或Se等健康元素的相关研究,为土地安全利用、高品质农产品的生产提供科学依据.
One-hundred and fifty five large-scale crop rice and root soil samples were collected in Nanchuan District of Chongqing,and some samples of corn,potato,tomato,rapeseed,plum and kiwifruit,and root soil were collected for testing and analysis.The bioavailability of the elements was characterized by bioconcentration factors.The effects of soil physical and chemical properties,soil composition,geological background,and crop types on the bioavailability of Cd were analyzed.The results showed that there was a certain degree of Cd exceeding the standard in rice and root soil in Nanchuan District,and the bioavailability of Cd was relatively low.Soil pH was the main controlling factor of Cd bioavailability,and the bioavailability was higher under acidic conditions.Plum,kiwi,and kiwifruit have weaker ability to enrich Cd.Therefore,it is possible to prevent heavy metal pollution in the soil and improve the quality of agricultural products by artificially regulating the pH of the field or adjusting the planting structure.The method can also be applied to the research of other soil heavy metals or health elements such as Se and provides a scientific basis for the safe use of land and the production of high-quality agricultural products.
作者
王锐
胡小兰
张永文
余飞
朱海山
李瑜
WANG Rui;HU Xiao-lan;ZHANG Yong-wen;YU Fei;ZHU Hai-shan;LI Yu(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)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2020年第4期1864-1870,共7页
Environmental Science
基金
重庆市技术创新与应用示范项目(社会民生类重点研发项目)(cstc2018jscx-mszd0617)
重庆市科技项目(KJ-2018034)。
关键词
CD
富集系数
生物有效性
影响因素
农产品质量
Cd
enrichment factor
bioavailability
influencing factors
quality of agricultural products
作者简介
王锐(1994~),男,硕士,主要研究方向为生态地球化学,E-mail:1372661182@qq.com。
