| 土壤－水分－植物体系中铅和镉的交互作用及其机制: Ⅱ. 根际中Pb-Cd的交互作用 |
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| 作者姓名： | CHEN Huai-Man LIN Qi ZHENG Chun-Rong |
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| 作者单位： | [1]InstituteofSoilScience,theChineseAcademyofSciences.P.O.Box821,Nanjing210008（China） [2]InstituteofSoilSci,theChineseAcademyofSciences.P.O.Box821,Nanjing210008（China） |
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| 基金项目： | *1Project supported by the National Natural Science Foundation of China (No.29477276) and the Laboratory of Material Cycling in Pedosphere, the Chinese Academy of Sciences. |
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| 摘 要： | The interaction of Pb-Cd can be observed not only in the uptake process of elements by plants and in their influence on the growth,but also in rhizosphere.The changes in extractable Cd and Pb concentrations in the rhizosphere soil of rice plants ,root exudates from wheat and wheat plant and their complexing capacity,with Pa and Cd were investigated under different Pb and Cd treatments.Results showed that the concentration of extractable Cd in the rhizosphere of rice in red soil was markedly increased by Pb-Cd interaction,It increased by 56% in the treatment with Pb and Cd added against that in the treatment with only Cd added in soil . The considerable differences in both composition and amount of root exudate from wheat and rice were found among different treatments.Pb and Cd might be complexed by root exudates ,The concentrations of free Pb and Cd in the solution were increased markedly by adding root exudate from wheat and decreased by that from rice due to Pd-Cd interaction.The distribution patterns of Pb and Cd in roots were affected by Pb-Cd interaction,which accelerated transport of Pb into internal tissue and retarded accumulation of Cd in external tissue.
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| 关 键 词： | 镉 铅 红壤 稻 小麦 根围 交互作用 土壤－水－植物体系 |
Interaction of Pb and Cd in soil-water-plant system and its mechanism: II. Pb-Cd interaction in rhizosphere |
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| CHEN Huai-Man,LIN Qi,ZHENG Chun-Rong.Interaction of Pb and Cd in soil-water-plant system and its mechanism: II. Pb-Cd interaction in rhizosphere[J].Pedosphere,1998,8(3):237-244. |
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| Authors: | CHEN Huai-Man LIN Qi and ZHENG Chun-Rong |
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| Institution: | Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 China. |
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| Abstract: | The interaction of Pb-Cd can be observed not only in the uptake process of elements by plants and in their influence on the growth,but also in rhizosphere.The changes in extractable Cd and Pb concentrations in the rhizosphere soil of rice plants ,root exudates from wheat and wheat plant and their complexing capacity,with Pa and Cd were investigated under different Pb and Cd treatments.Results showed that the concentration of extractable Cd in the rhizosphere of rice in red soil was markedly increased by Pb-Cd interaction,It increased by 56% in the treatment with Pb and Cd added against that in the treatment with only Cd added in soil . The considerable differences in both composition and amount of root exudate from wheat and rice were found among different treatments.Pb and Cd might be complexed by root exudates ,The concentrations of free Pb and Cd in the solution were increased markedly by adding root exudate from wheat and decreased by that from rice due to Pd-Cd interaction.The distribution patterns of Pb and Cd in roots were affected by Pb-Cd interaction,which accelerated transport of Pb into internal tissue and retarded accumulation of Cd in external tissue. |
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| Keywords: | Cd interaction Pb red soil rhizosphere of rice and wheat |
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