九龙江口红树植物叶片重金属元素含量及动态

本文探讨了福建九龙江口潮间带秋茄、木榄、红海榄、白骨壤和桐花树等红树植物叶片重金属元素Ｃｕ、Ｐｂ、Ｚｎ、Ｃｄ、Ｍｎ的含量及动态。结果表明，该河口红树林区表层土壤沉积物元素含量顺序为Ｍｎ〉Ｚｎ〉Ｐｂ〉Ｃｕ〉Ｃｄ；５种红树植物叶片元素含量顺序为Ｍｎ〉Ｚｎ〉Ｃｕ〉Ｐｂ〉Ｃｄ；不同物种叶片元素含量大都有明显差异；叶片对土壤元素富集系数，以Ｍｎ、Ｃｄ较高，Ｐｂ最低；随叶片从幼叶－成熟叶－黄叶的生长发育，Ｍｎ

Content and dynamics of five heavy metals elements in the leaves of five mangrove species in Jiulong Estuary

The paper deals with the content,seasonal and developmental dynamics of heavy metalselements: Cu, Pb, Zn, Cd and Mn in the leaves of Kandelia candel, Bruguiera gymnorrhiza,Rhizophora stylosa,Avicennia marina and Aegiceras corniculatum in the Jiulong Estuary. Theresults are indicated as follows. 1) The content order of the elements in the surface sedimentsof the region is Mn>Zn>Pb>Cu>Cd,and that in the leaves of the five mangrove species isas follows: Mn>Zn>Cu>Pb>Cd; 2)There are significant differences in the contents of eachelement in different species; 3)The enrichment coefficients of the leaves to the metal elementsin the surface sediments are low,relatively higher for Mn and Cd,and the lowest for Pb; 4)with the development of the leaves from mature to fall,the contents of Mn,Pb and Cd rise,but Cu and Zn decrease; 5) The contents of the elements in the leaves change with speciesand season. Though the existence of mangroves may promote the depositlon and fixation ofthe heavy metal elements in the sediments of the region,they can produce large amounts ofuncontaminated leaves for the consumers of the ecosystem.