Abstract: The accumulation and distribution of Cr, Ni and Mn in Avicennia marina mangrove community at Futian Mangrove Nature Reserve of Shenzhen are studied. The results show that the Cr, Ni and Mn contents in forest soil are increased from bottom to surface layer,and in the surface layer (depth 0～30 cm), their contents are 7.79, 25.0 and 537μg·g^-1 and storages are 1099. 86, 3450. 00 and 74106. 00 mg. m^-2, respectively. Cr, Ni and Mn contents in different parts of the plant are 0.28～ 0.75,0.43～7.65 and 25～1552μg·g^-1, and their storages in the community are 6. 06, 20. 76 and 1631. 17 mg· m^-2, respectively. The accumulation index of plant to soil is in the order of Mn> Ni≈Cr. The annual net retention accumulation of Cr, Ni and Mn in the community is 0. 43, 1. 43 and 107. 98 mg· m^-2,respectively. The storage of the elements in residues is 78. 00 μg· m^-2 for Cr, 1536. 33μg·m^-2 for Ni and 405. 54 mg· m^-2 for Mn. The Cr, Ni and Mn storages in leaves of various types of communities are in the order of Avicennia marina>Aegiceras corniculatum>Kandelta candel for Cr and Ni, and K. candel>A. marina> A.corniculatum for Mn.

Key words: Mangrove, Heavy metal, Futian of Shenzhen, distance analysis, priority areas, Pb isotope, coastal wetlands, NDVI