烟草科技2017，Vol.50Issue(2)：9-14,6.
烟草对镉的吸收积累特性及镉的化学形态分布
Characteristics of absorption, accumulation and chemical speciation of Cd in tobacco
摘要
Abstract
To clarify the characteristics of absorption, accumulation and chemical speciation of cadmium (Cd) in tobacco, the Cd absorption characteristics in tobacco, the contents and chemical speciation of Cd in tobacco roots, stalks and leaves at different Cd concentrations were studied by hydroponic experiments. The results showed that the amount of Cd absorption in tobacco decreased first then increased with the proceeding of Cd treatment; it became stable at 240 μg·plant-1 then decreased after that. The Cd absorption rate of tobacco presented a tendency of increase-decrease-increase and peaked within 4-5 hours after tobacco plants were transplanted in Cd solutions. With the increase of Cd concentration, the accumulation of dry matter in tobacco increased first and then decreased, and the dry matter weight was raised at a low Cd concentration. At different Cd concentrations, Cd content was the highest in stalks and the lowest in leaves, and it increased in all parts of tobacco with the increase of Cd concentration. The Cd in roots was mainly deionized water-extractable Cd, followed by acetic acid-extractable Cd, the Cd in leaves mainly existed in the form of binding to acetic acid.With the increase of Cd concentration, the Cd chemical speciation transformed from low activities in tobacco into the chemical speciation with high activities.关键词
烟草/镉(Cd)/化学形态/吸收速率/干物质量Key words
Tobacco/Cadmium (Cd)/Chemical speciation/Absorption rate/Dry matter weight分类
农业科技引用本文复制引用
贺远,吕耀印,贾涛,吴爽爽,李庆祥,张政强,石屹,王树声..烟草对镉的吸收积累特性及镉的化学形态分布[J].烟草科技,2017,50(2):9-14,6.基金项目
郑州轻工业学院博士科研基金项目"锌元素对土壤—烟草系统中镉化学形态及亚细胞分布的影响"(2014BSJJ070) （2014BSJJ070）
国家烟草专卖局特色优质烟叶开发重大科技专项"低危害烟叶开发"(TS-06-20110037). （TS-06-20110037）
