Accumulation and Dynamic of Heavy Metal Elements in Rhizophora stylosa Community at Yingluo Bay in Guangxi
Zheng Wen-jiao, Lian Yu-wu, Zheng Feng-zhong, Lin Peng
Chin J Plan Ecolo. 1996, 20 (1):
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The accumulation and dynamic of heavy metal, Cu, Pb, Zn, Cd and Cr elements were studied in Rhizophora stylosa mangrove community at Yingluo Bay of Guangxi, China. The results showed that: 1) In different parts of the plant the contents of the elements were. Cu 0.433～1.21, Pb 0.369～1.88, Zn 2.84～7.66, Cd 0.020～0.233 and Cr 0.330～0.562(μg/g). The contents of the elements in residues were much higher than those in the plant and litter fall.2)The pool amounts of the elements in standing crop of the community were. Cu 28.73, Pb 25.25, Zn 143.68, Cd 3.14 and Cr 14.61(mg/m2). The pool amounts of the elements in residues were: Cu271.68, Pb 323.41, Zn 1983.70, Cd 8.18 and Cr 34.44(g/m2). 3) The biological cycles of the elements in the community were: Annual retention, Cu 1351.70, Pb 1613.12, Zn 8808.37, Cd 240.74 and Cr 759.30 (g/m2); Annual retention: Cu 843.46, Pb 806.921, Zn 4694.10, Cd 94.88 and Cr 464.80 (g/m2); Annual return Cu. 509.24, Pb 806.21, Zn 4114.27, Cd 145.86 and Cr 294.50 (g/m2). 4) the turnover period was: Cu 56, Pb 31, Zn 35, Cd 22 and Cr 50 (a) . The flow coefficients were Cd>Pb and Zn>Cu and Cr.