广东黑石顶自然保护区南亚热带常绿阔叶林凋落物能流的研究

The Energy Flow Through the Litterfall of the South Subtropical Evergreen Broad-leaved Forest in Heishiding Nature Reserve

分析了广东省黑石顶自然保护区南亚热带常绿阔叶林凋落物能流的年际变化和季节变化。结果表明凋落物有明显的年际和季节变化 ,4年间平均凋落物能流为 9 36 3MJ·m- 2 ·a- 1 ,其中凋落叶占 81 95% ,1994年凋落物能流为 7 357MJ·m- 2 ·a- 1 ,低于平均值 2 1 4 %。说明了影响我国常绿阔叶林凋落物形成的主要环境因素是水分条件的年际和季节变化。

The energy flow through litterfall in different period over 4 years was researched.The results indicated the existence of obvious yearly and seasonal fluctuation of the energy flow through litterfall.The mean energy flow of litterfall over 4 years was 9 363 MJ·m -2 ·a -1 ,in which the energy flow coming from leaf litter accounted for 81 95% of the total.In 1994,the energy alow decreased to 7 357 MJ·m -2 ·a -1 ,being lower the 4 years mean by 21 4%.The cause of leaf falling is largely attributed to water insufficiency or drougyt during the growing season.The role of low temperature is much less than of drougyt in the leaf falling of the evergreen broad leaved forest in China.