武夷山甜槠林粗死木质残体的贮量、动态及其功能评述

 本文对武夷山甜槠林76龄成熟林内粗死木质残体的贮量、增枯量和分解量等进行了研究，对不同林龄甜槠林粗死木质残体的贮量动态进行了对比分析，并初步评述了它们在森林生态系统养分循环中的作用。研究结果表明：(1)甜槠林成林粗死木质残体贮量为7.349t·hm-2，增枯量为1.425t·hm-2·a-1，分解量为0.512t·hm-2·a-1；(2)随着林龄增长，不同林龄甜槠林的粗死木质残体贮量呈“S”型动态模式，至58龄阶段达到最大值，其后渐趋稳定；(3)粗死木质残体是甜槠林生态系统中较为重要的组成部分，其各养分元素贮量占该系统生物量分室总贮量的0.09%～1.91%，由增枯量实现的各养分元素归还量占养分元素归还总量的l.94%～4.48%。

STORAGE AND OYNAMICS OF COARSE WOODY DEBRIS IN CASTANOPSIS EYREI FOREST OF WUYI MOUNTAIN,WITH SOME CONSIDERATIONS FOR ITS ECOLOGICAL EFFECTS

Amount of storage, annual increment and decomposition of coarse woody debris (CDW)were examined in a 76-year old Castanopsis eyrei forest of wuyi Mountains. A comparative analysis of CWD storage in an age sequence of C. eyrei stands was carried out and its role in nutrient cycling in the ecosystem was initially estimated. Amount of CWD storage, annual increment and decomposition were 7.349%, 1.425 and 0.512 tons·hm-2·a-1, respectively. As the age of C. eyrei forest increased, CWD storage increased initially, arrived at the climax gradually at the age of 58 years, and declined then. CWD is a relatively important components of C. eyrei forest ecosystem. It contributed to 0.09%～1.91% of total nutrient storage in the total biomass of the ecosystem. About 1.94%～4.84% of total returns of nutrient element was through this route.