广东和海南红树林的生物地球化学特征

本文研究了广东和海南红树林的土壤,植物叶子和死地被物的化学成分以及它们之间的相互关系，并与相同地区的一些植物群落进行比较，从而探讨红树林的生物地球化学特征。结果表明，红树林的土壤和植物的某些化学成分含量较高，尤其是Na和Ca的含量较为突出。另外，虽然海岸带海水的pH＞8，土壤都呈酸性。红树林的养分利用率只有N较高，其余大多数元素都较低。红树林的生物吸收率和生物归还率通常也较低，但其大多数元素的生物分解率则较高。

Biogeochemical Characters of Mangrove Forests in Guangdong and Hainan Provinces

This paper deals with the biogeochemical characters of mangrove forestS of Guangdong and Hainan Provinces in chemical composition of soil. foliage, litter and their relationship as well as comparing mangrove forestS with other forests, The results show that chemical concentrations are higher in soil and foliage of mangrove forests than those in other forests. The differences of Na and Ca were especially large. The soil under mangrove is acidic although pH of sea water is larger than 8. Nitrogen utilization efficiency of mangrove forests is greater than those of other forests, but that of other elements is lower. The ratios of absorption and return of biology are usually lower in mangrove forests than those of other forestS, but biological decompositional ratios for most of elements are reverse.