Cadmium uptake and speciation changes in the rhizosphere of cadmiumaccumulator and non-accumulator oilseed rape varieties |
| |
Authors: | SU Dechun XING Jianping JIAO Weiping WONG Woonchung |
| |
Affiliation: | 1. College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China 2. Department of Biology,Hong Kong Baptist University,Kowloon Tong,Hong Kong,SAR,China |
| |
Abstract: | Characteristics of cadmium (Cd) uptake kinetics and distribution of Cd speciation in the rhizosphere for Cd accumulator and non-accumulator oilseed rape varieties were investigated under nutrient solution and rhizobox soil culture conditions. The results showed that the maximal influx (Vmax) for Cd2+ andKm were significantly different for the two oilseed rape varieties. The value of Vmax for Cd accumulator oilseed rape Zhucang Huazi was two-fold greater than that for oilseed rape Chuan you II-93. The exchangeable Cd concentration in the rhizosphere was significantly lower than in non-rhizospheric soils supplemented with CdSO4 for both the varieties. Carbonate-bound Cd in the rhizosphere of Cd accumulator oilseed rape was significantly higher than that in the rhizosphere of non-accumulator oilseed rape and non-rhizospheric soil. Cd accumulator oilseed rape had a higher Cd2+ affinity and more ability to uptake insoluble Cd in the soil than the non-accumulator oilseed rape. |
| |
Keywords: | cadmium oilseed rape rhizosphere uptake kinetics |
本文献已被 CNKI 维普 万方数据 ScienceDirect 等数据库收录! |
| 点击此处可从《环境科学学报(英文版)》浏览原始摘要信息 |
|
点击此处可从《环境科学学报(英文版)》下载全文 |