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福建红树林湿地沉积物重金属的环境地球化学研究【作者】刘景春 【导师】严重玲

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福建红树林湿地沉积物重金属的环境地球化学研究
B\E j N0b$J:h/Y0Studies on Environmental Geochemistry of Heavy Metals in Mangrove Wetland Sediments of Fujian Province

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作者刘景春导师】严重玲水利论文@GN(y P%Z2qRf-MS
【作者基本信息】厦门大学,生态学,2006年,博士水利论文;[x3X#zk@-fb2g:u@!ZE

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+e0xV)xU AMn)k?0【中文摘要】 福建省九龙江、漳江口红树林湿地是我国两处重要的红树林自然保护区。近年来随着地区经济的快速发展,排入海湾河口的重金属污染物迅速增多,大量的污染物汇集于河口海湾区,使得红树林湿地面临着越来越严重的重金属污染物的冲击。本研究以这两处红树林湿地为典型地区,选择七种主要的重金属元素(Fe、Mn、Zn、Pb、Cu、Ni、Cd)为研究对象,采用连续提取法(SEPs: Sequential extraction procedures),分析几种重金属元素在红树林湿地沉积物中含量、赋存形态的空间分布规律,及其与沉积物理化性状的关系,探讨重金属污染物在红树林湿地累积、迁移的规律;结合根际模拟试验,探寻红树植物根系行为对重金属(Cd)含量、形态的影响。最后通过研究酸可挥发性硫化物(AVS)与同时可提取重金属(SEM)在试验红树林湿地中的空间分布规律来评价红树林湿地重金属污染的现状。以期为红树林湿地重金属的污染评价、红树林生态系的保护和恢复提供理论依据。主要研究结果如下:1.在试验红树林湿地沉积物中,七种重金属含量的大小顺序均表现为:Fe> Mn >Zn >Pb >Cu >Ni ...更多>Cd。按照国家海洋沉积物质量标准,在九龙江口、漳江口红树林湿地林内表层沉积物中, Zn的含量分别超过二类(≤350 mg.kg-1干重)和一类沉积物(≤150 mg.kg-1干重)标准;Pb的含量分别接近、超过了一类沉积物标准(≤60 mg.kg-1干重);Cu的含量均超过了一类沉积物标准(≤35mg.kg-1干重);漳江口红树林湿地林内表层沉积物Cd的含量为0.36mg.kg-1干重(0.48-0.25mg.kg-1干重),未超过一类沉积物标准(≤0.5mg.kg-1干重),但九龙江口红树林湿地林内表层沉积物中Cd的含量为3.19mg.kg-1干重(1.95-5.37 mg.kg-1干重),超过了国家二类沉积物的标准(1.5mg.kg-1干重)。研究红树林湿地表层沉积物中,不同重金属表现出了不同的形态分布。除Fe外,其余六种重金属残渣态比例均较低,非残渣态比例较高。九龙江口红树林湿地林内表层沉积物中,铁锰氧化物结合态是重金属的主要赋存形态,其占重金属总量的比例分别为:73%(Pb)、52%(Fe)、51%(Mn)、48%(Cu)、35%(Zn)、31%(Cd)、28%(Ni);与九龙江口红树林湿地相比,漳江口红树林湿地林内沉积物中重金属有机质-硫化物结合态比例均较高,使得铁锰氧化物结合态和有机质-硫化物结合态成为该湿地重金属结合的两种主要形态。两种形态重金属占重金属总量的比例分别为:Fe(铁锰氧化物结合态:41%;有机质硫化物结合态:8%);Mn(铁锰氧化物结合态:35%;有机质硫化物结合态:25%);Zn(铁锰氧化物结合态:27%;有机质硫化物结合态:32%);Pb(铁锰氧化物结合态:38%;有机质硫化物结合态:33%);Cu(铁锰氧化物结合态:26%;有机质  还原水利论文dnX,`5`;C9C

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【英文摘要】 Jiulongjiang estuary mangrove wetland and Zhangjiang estuary mangrove wetland of Fujian province are two of important natural reserves of mangrove in China. In recent years, rapid economic growth and development in the region has led to excessive release of heavy metal pollutants into the wetland. The accumulation of contaminants in wetland sediments is likely to pose serious environmental problems in mangrove ecosystem. In present study, sequential extraction procedures were used to reveal the spatial distribution of total concentration and speciation of 7 heavy metals (Fe, Mn, Zn, Pb, Cu, Ni and Cd) in these two mangrove wetlands. To discuss accumulation and transition principle of metals in the sediments, the relationships between metal contents, speciation and physical chemical properties of sediments were analyzed, and speciation changes of Cd in mangrove (Kandelia candel(L.)) rhizosphere sediments were studied by using rhizobox. Finally, the contents of AVS (Acid volatile sulfide...更多) and SEM (Simultaneously extracted metal) were measured to reveal their spatial distribution in mangrove wetland, and the differences of AVS, SEM mole concentration were adopted to evaluate the condition of metal pollution. The results were showed as follows and hoped to can guideline the reserve and restoration of mangrove wetland.1. Order of total metal concentrations was Fe> Mn >Zn >Pb >Cu >Ni >Cd in the study areas. According to the standard quality of marine sediment in China, Zn, Pb, Cd and Cu polluted the mangrove wetland of Jiulongjiang estuary, and Zn, Pb, and Cu polluted the mangrove wetland of Zhangjiang estuary. The results showed that metal speciation distribution was metal-specific and site-specific. Low percentage of metal was found to bound to residual fraction, except Fe. The Fe-Mn oxide fraction (F3) was dominant for all 7 metals in Jiulongjiang mangrove wetland, and the percentage was 73%(Pb),52%(Fe),51%(Mn),48%(Cu),35%(Zn),31%(Cd), and 28%(Ni)respectively. Both Fe-Mn oxide fraction and bound to organic matter-sulfide fraction (F4) were important for these metals in mangrove wetland of Zhangjiang estuary, and the percentages respectively were: Fe (F3:41%;F4:8%), Mn (F3:35%;F4:25%), Zn (F3:27%;F4:32%), Pb (F3:38%;F4:33%), Cu (F3:26%;F4:  还原水利论文9] @)MJ[VGrdn

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【中文关键词】 红树林湿地; 沉积物; 重金属; 形态; 酸可挥发性硫化物水利论文j.KC0qF
【英文关键词】 Mangrove wetland; Sediment; Heavy metal; Speciation; Acid volatile sulfide (AVS)水利论文tc6W3LH!kna9v'f

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