海南岛尖峰岭热带林凋落物研究初报

 本文研究了海南岛尖峰岭林区热带山地雨林及半落叶季雨林的凋落物产量动态及其组成、季节变化规律和主要化学成份，并分析比较其在物质循环过程中的作用，对了解热带森林生态系统的功能、热带森林土壤的形成过程及其生产能力的研究，对热带土地资源的保护利用，均有重要意义。

LITTER-FALL IN TROPICAL FOREST AT JIANFENGLING MOUNTAINS, HAINAN ISLAND

The production dynamic, main chemical components and its storage of litter-fall in two major forest types in the Jianfengling mountains region in Hainan Island were studied in the present article.The mean annul total dry weight of litter-fall in the tropical mountain rain forest (alt. 850m) is up to 7.7t/ha containing branches 21.3%, leaves 70.7%, and flowers and other mixed-matter only 8.0%; while in the semideciduous monsoon forest (alt. 200m) it is 9.7t/ha, containing 17.5%, 76.4% and 6.1% of these things respectively. The seasonal change patterns of falling in both types are similar, and the maximum quantity of litter-fall occursin March-April (the driest months) and the minimum in December-January. The change of litter-fall depends on thar of the month.The order of the chemical components of litter-fall in these two forest types tends to be Ca>Si>K>Mg>Al>P>Fe>Na, the total amount of elements in the semi-deciduous monsoon forest is greater than that in mountain rain forest. About 70-86% of the contents of chemical elements in both types were rich in the leaves.The amount of the chemical elemtnts of the litter-fall returning back to the soil in the semi-deciduous monsoon forest is greater than that of mountain rain forest.