广西英罗湾红海榄红树群落锰镍元素的累积和循环

Accumulation and Biological Cycle of Mn and Ni Elements in A Rhizophora stylosa Community in Yinluo Bay of Guangxi

探讨了广西英罗湾红海榄红树林Ｍｎ、Ｎｉ元素的累积和生物循环，结果表明：红海榄植物体不同部位Ｍｎ、Ｎｉ元素的含量范围，分别为６．５６～４７．９和０．２７～２．８９μｇ／ｇ。该群落Ｍｎ，Ｎｉ元素的现存储量分别为４３０．３９和３０．８８ｍｇ／ｍ￣２．林地残留物Ｍｎ、Ｎｉ储量分别为１７７６．９和６０．３μｇ／ｍ￣２．群落Ｍｎ、Ｎｉ元素的生物循环中，年吸收量分别为５３６９２．０和１６２７．７μｇ／ｍ￣２，年归还量分别为３９６５３．１和５７３．４μｙ／ｍ￣２，年存留量分别为１４０３８．９和１０５４．０μｇ／ｍ￣２．流动系数Ｍｎ＞Ｎｉ，周转期Ｍｎ１１年快于Ｎｉ５４年。

The accumulation and biological cycle of Mn and Ni elements were studied inRhizophora stylosa community in Yinluo Bay of Guangxi.The results showed that:In differentparts of the plant,the content of Mn and Ni was 6.56～47.9 and 0. 27～2.89(μg/g)respective-ly. The total amounts of Mn and Ni elements in standing crop of the community were 430.39for Mn and 30.88 for Ni(mg/m￣2). The amounts of Mn and Ni in residues were 1776.9 for Mnand 63.0 for Ni(μg/m￣2).In biological cycles of two elements in this stand,the annual absorbedMn and Ni by vegetation were 53 692.0 and 1627.7(μg/m￣2 ) respectively, in which annual re-served Mn an Ni were 14 038.9 and 1054.0(μg/m￣2),and annual returned Mn and Ni were 39653.1 and 573.4(μg/m￣2)respectively.The turnover period of Mn(lla)was faster than Ni(54a)。