Behavior of Cd and Zn in rhizosphere of Brassica plants grown in an andosol contaminated with Cd and Zn
Behavior of Cd and Zn in rhizosphere of Brassica plants grown in an andosol contaminated with Cd and Zn
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镉和锌污染的安多土壤中生长的芸苔属植物根际镉和锌的行为
DOI：
10.1080/00380768.2003.10410332
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发表时间：
2003
影响因子：
2
通讯作者：
M. Chino
中科院分区：
文献类型：
--
作者：
S. Goto;H. Hayashi;T. Yoneyama;M. Chino
摘要以两种芸苔属植物为研究对象，在根际土壤中对Cd和Zn的吸收规律进行了研究。24 Cd和398 Zn mg kg−1干土)。所选用的芸苔属植物为60 / 31 （BT, Brassica juncea × Thlaspi caulescens）和小松（Brassica campestris var. rapa）杂交植物。栽培34 d时，BT和小松的根生长区和0-1 mm区土壤pH值分别从5.5降至4.6左右和4.9左右。中耕区和0 ~ 1 mm中耕区土壤中1 M nh4cl可提取Cd浓度降低，而nh4cl可提取Zn浓度升高。在目前的实验条件下，可以认为锌是通过质量流从外舱向rc移动的。另一方面，由于植物吸收的Cd量远远大于通过Cd质量流提供给根表面的Cd量，因此认为rrc和0-1 mm Z.C中的Cd主要是通过扩散移动的。植物吸收的Cd量与nh4cl可提取的Cd量相似，在rrc和0-1 mm Z.C中减少。表明植物对Cd的吸收主要局限于中耕和0 ~ 1 mm中耕，因此选择根表面积大的植物对土壤Cd进行有效的修复是很重要的。
Abstract Behavior of Cd and Zn in the rhizosphere soil and their uptake by two species of Brassica plants were investigated by using a rhizobox system filled with an Andosol contaminated with Cd and Zn (4 .24 Cd and 398 Zn mg kg−1 dry soil). The Brassica plants used were hybrid 60 / 31 (BT, Brassica juncea × Thlaspi caerulescens) and komatsuna (Brassica campestris var. rapa). By 34 d of plant cultivation, the soil pH values in the root-growing zone compartment (R.C.) and 0–1 mm zone compartment (0–1 mm Z.C.) decreased from 5.5 to around 4.6 in BT and to around 4.9 in komatsuna. The 1 M NH4Cl-extractable Cd concentrations in the soils of R.C. and 0–1 mm Z.C. of the rhizobox decreased, while the NH4Cl-extractable Zn concentrations in the soils of these compartments increased. Under the present experimental conditions, it is considered that Zn moved from the outer compartments toward R.C. by mass flow. On the other hand, it was considered that Cd in R.C. and 0–1 mm Z.C. moved mainly by diffusion because the amount of Cd taken up by the plants was much larger than that supplied to the root surface by mass flow of Cd. The amounts of Cd absorbed by the plants were similar to those of NH4Cl-extractable Cd which decreased in R.C. and 0–1 mm Z.C., suggesting that plant uptake of Cd was mainly confined to R.C. and 0–1 mm Z.C. It is thus important to select plant species with a large root surface area for effective phytoremediation of soil Cd.