doi:

DOI: 10.3724/SP.J.1145.2013.00945

Chinese Journal of Appplied Environmental Biology (应用与环境生物学报) 2013/19:6 PP.945-951

Spatial Distribution of Heavy Metals in Spatial Distribution of Heavy Metals in Kandelia candelKandelia candel Wetland Sediments Wetland Sediments of Natural Forest and Plantation in the North Marginal Region of Chinese of Natural Forest and Plantation in


Abstract:
For a comprehensive understanding of spatial distribution for heavy metals of Kandelia candel ecosystem in the north marginal region of natural mangrove wetlands, horizontal and vertical spatial distribution characteristics of contents of heavy metals (Zn, Pb, Cd, and Cu) were analyzed for mangrove sediments of different origins (plantation and natural forest). The absorption for heavy metals in natural forest was stronger than in plantation. In both plantation and natural forest, Zn and Pb had high contents, while Cd and Cu had low contents. Though the horizontal distribution of contents of the 4 types of heavy metals varied differently between the plantation and natural forest, there was a uniform declining trend in both for all 4 types deep in the forest. The contents of all 4 heavy metals showed signi fi cant differences at or near the forest edge. An edge effect existed generally between natural forest and plantation. With increase of the depth, the contents of the four heavy metals fi rstly increased and then decreased, especially for Cd and Cu. The distinct fl uctuation in the depth of 30-60 cm suggested a special mechanism of heavy metal accumulation there. Correlations between the physiochemical properties of sediments and contents of heavy metals in 15 m and 50 m inside-forest were much higher than those in 100 m outside-forest, suggesting a stronger absorption for heavy metals by natural Kandelia candel forest than plantation in the north marginal region of natural mangrove wetlands. However, the distribution law of mangrove sediments was the same in horizontal and vertical spaces regardless of the origin. Fig 2, Tab 2, Ref 32

Key words:Kandelia candel mangrove,origin,wetland sediments,heavy metal,spatial distribution,Fuding city

ReleaseDate:2015-04-15 08:42:20



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