海南岛海莲红树林的钙镁累积和循环

Accumulation and biological cycle of elements Ca and Mg in Bruguiera sexangula community of Hainan Island in China

本文是海南东寨港红树林研究的一部分,主要讨论55年生海莲林的Ca、Mg元素的累积和生物循环。试验结果表明,在海莲群落现存量中,含有Ca、Mg总量分别为3258.1和597.9kg·ha^(-1),其中地上部分别为1891.9和247.1kg·ha^(-1),地下部分别为1366.2和350.8kg·ha^(-1)。该群落的Ca、Mg元素的生物循环中,年吸收量分别为382.0和100.4kg·ha^(-1),存留量131.3和20kg·ha^(-1),归还量为250.7和80.4kg·ha^(-1)。Ca的周转期为13年,较Mg8年为慢。

This paper is a part of studies of mangrove forest in Dongzhai harbour of Hainan Island in China. It deals mainly with the accumulation and biological cycle of elements Ca and Mg of 55-year-old Bruguiera sexangula community. The main results of the study are as fallows: 1) The total amounts of Ca and Mg in standing crop of this community were 3258.1kg·ha^(-1) and 597.9kg·ha^(-1) respectively among which, 1891.9kg·ha^(-1) of Ca and 247.1kg·ha^(-1) of Mg contained in the aerial part, and 1366.2kg·ha^(-1) of Ca and 350.8kg·ha^(-1) of Mg contained in the ground part. 2) In the biological cycles of Ca and Mg of this stand, 382.0kg·ha^(-1) of Ca and 100.4kg·ha^(-1) of Mg were annually uptook by the community, among which 250.7kg·ha^(-1) of Ca and 80.4kg·ha^(-1) of Mg were returned and 131.3kg·ha^(-1) of Ca and 20.0kg·ha^(-1) of Mg were retained. 3) The turnover period of Mg (8 yrs.) was faster than that of Ca (13 yrs.).