深圳福田白骨壤群落Cr、Ni、Mn的累积及分布

Accumulation and distribution of Cr, Ni and Mn in Avicennia marina mangrove community at Futian of Shenzhen

探讨了深圳福田自然保护区白骨壤红树林对Ｃｒ、Ｎｉ、Ｍｎ的吸收、累积及分布．结果表明，该林地土壤Ｃｒ、Ｎｉ、Ｍｎ含量从底层至表层逐步提高；表层（０～３０ｃｍ深）３种元素含量分别为７．９７、２５．０和５３７μｇ·ｇ－１，贮量分别为１０９９．８６、３４５０．００和７４１０６．００ｍｇ·ｍ－２．白骨壤植物各部位Ｃｒ、Ｎｉ、Ｍｎ含量范围分别为０．２８～０．７５、０．４３～７．６５和２５～１５５２μｇ·ｇ－１；植物对表层土壤加权平均富集系数为Ｍｎ＞Ｎｉ≈Ｃｒ．该群落Ｃｒ、Ｎｉ、Ｍｎ的现存累积量分别为６．０６、２０．７６和１６３１．１７ｍｇ·ｍ－２，年净存留累积量分别为０．４３、１．４３和１０７．９８ｍｇ·ｍ－２；林地残留物相应元素储量分别为Ｃｒ７８．００μｇ·ｍ－２、Ｎｉ１５３６．３３μｇ·ｍ－２和Ｍｎ４０５．５４ｍｇ·ｍ－２．该林区３种不同类型群落叶层Ｃｒ、Ｎｉ现存累积量为白骨壤林＞桐花树林＞秋茄林，Ｍｎ为秋茄林＞白骨壤林＞桐花树林．

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. 33 μg· 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 corniculatm> Kandelta candel for Cr and Ni, and K. candel> A. marina > A.corniculatum for Mn.