硫、磷对几种重金属在红树根-土系统中赋存、迁移的影响
Effects of Sulfur and Phophorus on Fraction Distribution and Migration of Heavy Metals in Mangrove-Sediment System
本文以红树植物秋茄及野外红树林湿地沉积物为试材,通过根际箱模拟栽培实验，研究了不同硫、磷处理条件下，Zn、Cd、Cu、Ni、Pb五种重金属元素在秋茄根际、非根际沉积物中的赋存形态分配及在植物不同器官中的累积分配变化。研究结果表明，外源硫酸盐的添加可显著减少沉积物中"酸可提取态"、"可还原态"重金属比例，增加"可氧化态"重金属的含量；磷含量的增加则对"酸可提取态"重金属含量具有显著影响。非根际沉积物中"酸可提取态"、"可氧化态"重金属的比例显著高于根际；而"可还原态"在根际沉积物中的比例较高。不同硫水平下，秋茄根表铁膜含量存在显著差异；铁膜的量与几种重金属在秋茄根部的累积存在显著相关性。沉积物中硫含量的增加，减少了植物体内Cd的含量，但Cu、Zn、Ni、Pb在根部的累积量却显著增加。试验表明，红树林沉积环境中硫、磷的含量及红树植物的生长对重金属污染物在土壤-植物系统中的迁移具有显著影响。
环境污染、环境污染防治
生态学红树根际重金属硫磷
李健,林钰珊,刘景春,卢豪良,严重玲.硫、磷对几种重金属在红树根-土系统中赋存、迁移的影响[EB/OL].(2012-12-28)[2025-10-25].http://www.paper.edu.cn/releasepaper/content/201212-1147.点此复制
In this study, mangrove seedlings(Kandelia obovata (S.L.)) were cultivated in rhizo-boxes, which contained sediments collected from natural mangrove forest and modified with different rates of sulfate and phophate. The fraction distributions of Zn, Cd, Cu, Ni and Pb in rhizosphere and non-rhizosphere sediments were studied by using a sequential extraction method(BCR). Metal concentrations in plant organs and iron plaque on root surface were also determined to reveal migration variation of heavy metals in plant-sediment system. The results showed that: (1), The percentage of acid extractable and reducible metals decreased accompanied be the increasing of oxidizable phase under sulfate adding treatment; while phophate adding treatment had a significant effect on acid extractable metal concentration. (2), Compared with non-rhizosphere sediments, metals in rhizosphere had higher percentage of reducible fraction, but lower percentage of acid extractable and oxidizable phase. (3), The content of iron plaque on root surface undergone significant variation under different sulfate treatments, and it played an important role in metal concentration of root. (4), Sufate adding markedly reduced root Cd concentration, but significantly enhanced the Cu, Zn, Ni and Pb concentration in root. The results indicate that sulfur,phosphrus content in mangrove sediment, and the growth of mangrov plant can significantly influence the migration of heave metals in mangrove estuary.
Ecologymangroverhizosphereheavy metalsulfurphosphorus
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