两种红树植物落叶分解速率的研究

研讨了红树林生态系统结构中的一个关键环节:落叶的分解速率。结果表明,春、夏、秋、冬四季,九龙江口主要的红树林种类秋茄(Kandelia candel)和白骨壤(Avicennia marina)落叶的半分解期分别为26、18、24、56d和14、6、11、25d;落叶中的主要元素氮、磷、钾在分解过程中也其有较快的释放速率;采用不同孔径分解网的对比结果表明,海洋动物通过啃食和破碎对落叶的分解可能起了重要作用。高分解率使红树植物提供的大量凋落物很快地进入河口海岸生态系统的其它方面。

Litter Leaf Decomposition of Two Species of Mangrove

This paper dealt mainly with one critical link of mangrove ecosystem, i, e. decomposition rate of litter leaf. Experimental results showed that the leaf decomposition half time (dry mass) from spring to winter was 26, 18, 24, 56 d for Kandelia candel and 14, 6. 11, 25 d for Avicennia marina respectively. By chemical analysis, it could be shown that the main mineral nutr ents, N, P, K, in the leaf litter released quickly during decomposition. The experiments employing different mesh size bags suggested that marine animals may play a significant role in litter decomposition via feeding on and fragmentizing, it was concluded that by quick decomposition, a great deal of mangrove Utter is rapidly incorporated into the rest of the estuarine and coastal ecosystem.