农学学报2024，Vol.14Issue(3)：53-57,5.
污染农田茭白镉积累特点及茭白安全生产的土壤镉阈值
Cd Accumulation Characteristics of Zizania latifolia in Polluted Farmland and Safety Threshold of Cd in Producing Areas
摘要
Abstract
To understand the characteristics of Cd uptake and accumulation by Zizania latifolia,57 pairs of Zizania latifolia organs(roots,short stems,leaves and fleshy stems)and topsoil samples were collected from Cd-polluted fields in Zhejiang Province to study the accumulation of Cd in different organs of Zizania latifolia and its relationship with soil Cd content.The results showed that Cd accumulated in different organs of Zizania latifolia decreased in the order of root＞short stem＞leaf＞fleshy stem.The average enrichment coefficients of Cd in root,short stem,leaf and fleshy stem were 1.553,0.675,0.222 and 0.077,respectively.Correlation analysis showed that Cd accumulated in different organs of Zizania latifolia was positively correlated with total soil Cd,and their correlation coefficients with various organs from high to low was root＞short stem＞leaf＞fleshy stem.The enrichment coefficients of Cd in various organs of Zizania latifolia decreased with the increase of soil pH value.A high proportion of Cd in roots was found in oxide iron-bound form,which indicated that the accumulated iron oxides on the root surface of Zizania latifolia could prevent Cd from entering into its aboveground part.The preliminary analysis showed that when the soil pH≤5.5,5.5＜pH≤6.5,6.5＜pH≤7.5,and corresponding total Cd content in the soils was below 1.00,1.25 and 2.00 mg/kg,respectively,the Cd content in the fleshy stem of Zizania latifolia was below 0.050 mg/kg,which could meet the requirements of safe production.The study showed that the edible part(fleshy stem)of Zizania latifolia had the characteristics of low Cd accumulation,which could be used as a substitute for rice in the farmland with medium and light Cd pollution.关键词
茭白/镉/积累特点/安全生产Key words
Zizania latifolia/Cd/accumulation characteristics/safety production分类
农业科技引用本文复制引用
丁利群,陈宇航,章明奎..污染农田茭白镉积累特点及茭白安全生产的土壤镉阈值[J].农学学报,2024,14(3):53-57,5.基金项目
国家自然科学基金"长期全年淹水集约种植对水耕人为土性态演变和物质循环及生态功能的影响"(41977001). （41977001）
