| Mangroves thrive along the coastlines throughout most of the tropics andsubtropics. These intertidal forests play important ecological roles in the purification.With the population increasing during recent decades, anthropic factors change the theecosystem functions.At the same time, with the increasing of industry andagriculture,heavy metal pollutant inflow into the wetlands. Environmental pressure inmangrove wetland increased graduatelly. In this study, based on the field investigationand labotory analysis, the accumulation ability and distribution characters of Cu, Pband Zn in Hainan had been conducted. Four main mangrove wetlands were selected asstudy sites, they were Dongzhai Harbor, Qinglan Harbor, Xinying Harborr and SanyaRiver. Samples of soil and plant tissues （branch, leaf and root） of different mangroveplants in3age-levels were collected from four sites, Results showed thataccumulation abilities are various in different species, age stages and plant issues.The results were showed as follows:1.There were significant difference between sites of various human activities.Compared relatively with the background, the content of Cu、Zn and Pb wererelatively high（the percent was181.24%，247.54%，116.72%）. The order of threeheavy metals content in four mangrove sediment was Zn>Pb>Cu. The content rangeof Cu content in mangrove soil was3.05μg g-141.55μg g-1, the average valuewas18.88μg g-1, the content range of Zn content was42.16μg g-1325.15μg g-1,the average value was134.04μg g-1, and the Pb was16.00μg g-149.7μg g-1, theaverage value was30.71μg g-1.2. Compared with different sample areas, the content of the three heavy metals inthe four sites had the order as follows: Dongzhai Harbor>Xinying Harbor>QinglanHarbor>Sanya River. The content of Cu、Zn and Pb were high in Dongzhai Harbormangrove than others. And the highest content of Cu with Kandeliaobovata(41.55μg g-1), the least content was found in Sonneratia hainanensisko(3.05μg g-1) which grown in Sanya River. With the hightest content of Zn and Pbwas Bruguiera gymnorrhiza in Dongzhai Harbor, the value were325.15μg g-1and 49.7μg g-1.3. Heavy metal content in different plant tissue showed significant difference inseveral species. Cu mainly in the parts of the roots and branches, and the contentrange of0.74μg g-122.71μg g-1. The Zn element mainly in the parts of thebranches and leaves, with the content range of8.36μg g-130.69μg g-1. The sameas Pb element, it mainly in the parts of the branches, the content range of3.24μg g-125.16μg g-1.4. Affected by pollution sources, the order of heavy metal Cu in mangrove plantwas Xinying Harbor>Sanya River>Qinglan Harbor>Dongzhai Harbor. As for Zn andPb were Xinying Harbor>Dongzhai Harbor>Qinglan Harbor>Sanya River. The highcontent of heavy metal was tend to small and medium-sized age mangrove plantsexpect Sonneratia apetala.5. Through Correlation analysis of heavy metal content between plant tissues andsoil. Leaf of Cu, Zn and Pb content were positively correlated with the heavymetal content in soil. The heavy metals Zn and Pb of Roots, branches were positivelycorrelated with soil, negatively correlated with Cu content. The coefficient were-0.063and-0.321.6. The order of the heavy metal enrichment factor of mangrove plants in differentareas was Sanya River>Xinying Harbor>Qinglan Harbor>Dongzhai Harbor. And theenrichment factor range of heavy metals Cu:0.0357-3.2945, Zn:0.0516-0.5331, Pb:0.0992-0.421.7. Mangrove plant （Avicennia marina, Rhizophora apiculata, Bruguierasexangula, Ceriops tagal, Aegiceras corniculatum） grown in different areas havedifferent enrichment factor of heavy metal. Except Bruguiera sexangula, the otherfour species plants have obvious differences in enrichment factor of heavy metal. |
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