中文摘要：

[目的]通过实地调查和采样对粗木质残体（CWD）进行量化研究,来了解未受冰灾干扰的岭南藜蒴栲-罗浮柿群系CWD的本底数据,建立CWD生物量回归方程。[方法]采用样方调查法,分析粤北小坑国家森林公园的常绿阔叶次生林在不同地形下CWD的基础特征及其存在形式、腐解等级和径阶的分布格局。[结果]表明：该林分CWD总贮量为8.25 t·hm^-2,各腐解等级（1、2、3、4、5）所占比例分别为41.07%、17.75%、13.89%、21.74%、5.55%;CWD主要以倒木和枯立木的形式存在,其次是大枯枝和根桩;径阶结构主要集中在5 10、10 15 cm。[结论]CWD的空间异质性较大,但不同地形下其贮量、蓄积量、覆盖面积和数量差异不显著（p〉0.05）。通过423个粗木质残体直径和质量的实测数据建立了CWD不同腐解等级的生物量幂函数回归方程。

英文摘要：

Objective]In order to understand the basic data and establish biomass regression equation of coarse woody debris（CWD）in a Castanopsis fissa-Diospyros morrisiana formation which was not influenced by ice storm, we carried out field investigation and sampling in Xiaokeng National Park,located in north of Guangdong. [Methods]We analyzed the basic characteristics and existing forms,distribution patterns in decay class and diame-ter of CWD in different landforms by plant plot investigation method.[Results]The results indicated that the total biomass of CWD was 8.25 t·hm^-2,and the biomass in different decay class（1、2、3、4、5）occupied 41.07%, 17.75%,13.89%,21.74%,5.55% respectively in the forest.The CWD was mainly composed of fallen logs and snags,followed by the large branches and stumps.Diameter structure of CWD concentrated in the range of 5 10 cm and 10 15 cm.[Conclusions]The spatial heterogeneity of CWD was high,but there was no significant differ-ence in different landforms.Furthermore,biomass regression equation of CWD in different decay class levels were established by using 423 measured diameter and weight data of CWD.