九龙江口红树林研究IV.秋茄群落的氮、磷的累积和循环

本文是福建九龙江口红树林生态系统研究的一个部分，主要讨论20年生秋茄群落的氮、磷含量及其生物循环。试验结果表明：秋茄群落现存量中，含有氮、磷总量分别为935.47和112.02公斤／公顷。其中地上部分别为582.26和70.47公斤／公顷，地下部分别为353.21和41.55公斤／公顷。该群落氮、磷元素生物循环中，年吸收量分别为213.31和21.75公斤／公顷；存留量分别为83.75和10.91公斤／公顷；归还量分别为129.52和10.84公斤／公顷。它们的氮含量均大于磷含量，周转期氮需7年比磷需10年为快。

Studies on the Mangrove Ecosystem of the Jiulong Jiang River Estuary in China. IV. The Accumulation and Biological Cycle of Nitrogen and Phosphorus Elements in the Kandelia candi Community

This is a paper dealing with the accumulation and biological cycle of the nitrogen and phosphorus elements of the artificial 20-year-old Kandelia candel community, in the Jiulong Jiang river estuary of Fujian Province, China.The main results of measurements are as follows:1. The amounts of nitrogen and phosphorus in the standing crop of this community were 935.47 kg/ha and 112.02kg/ha; in which the amounts of the two elements in the biomass above ground were 582.86 kg/ha for N and 70.47kg/ha for P, and in the biomass underground were (kg/ha) 353.21 for N and 41.55 for P respectively.2. In biological cycle of nitrogen and phosphorus of this stand, the annual values of the vegetation mineral uptake are (kg/ha yr) 213.31 for N and 21.75 for P, and those of retention of are (kg/ha yr) 83.75 for N and 10.91 for P, and the annual amounts released are (kg/ha yr) 129.52 for N and 10.84 for P respectively.3. The speed of nitrogen recycling period (7 yrs.) is faster than that of phosphorus (10 yrs.). The biological decompositional ratio of the mangrove forest in Fujian is larger than that of the tropical rainforest in Yunnan, and it is possible that this is concerned.with the tidal habitat of the mangrove forest.