【摘要】 森林粗死木残体 (Coarse woody debris,CWD)在不同的文献中有不同的定义 ,没有通用而确切的概念用来描述 CWD,对研究结果的比较造成了很大障碍。 2 0世纪 90年代以来 ,随着景观生态学的发展 ,以及对 CWD生态功能的深入研究 ,国外的森林管理和研究机构 (例如 USDA Forest Service和 L TER)为了把 CWD放在区域以及景观尺度上进行比较 ,对 CWD的概念等进行了统一 ,将其直径标准由原来的≥ 2 .5 cm调整到≥ 10 cm,但是我国在此方面还没有与国际接轨 ,仍采用旧标准 (≥ 2 .5 cm ) ,这样的研究结果难于和国外进行比较 ,不利于我国 CWD的长期深入研究。另外 ,有关 CWD的分类一直以来也没有形成一个完整的分类系统 ,我国也缺少 CWD分类方法的介绍。鉴于以上情况 ,综合国内外近年来在 CWD方面的研究动态 ,综述了 CWD的概念和分类情况 ,并初步提出较综合的 CWD概念及其分类系统 ,以供相关研究者讨论和参考 ,为我国的 CWD研究起到推动作用更多还原

【Abstract】 Coarse woody debris (CWD) is generally considered as dead woody material, in various stages of decomposition, including sound and rotting logs, snags, stumps and large branches. CWD is an important functional and structural component of forested ecosystems and plays an important role in nutrient cycling, long-term carbon storage, tree regeneration and maintenance of heterogeneous environmental and biological diversity. However, The definition and classification of CWD have been the subject of long debate in forest ecology. CWD has not been precisely defined. Recently, with the rapid development of landscape ecology and research in CWD, the USDA Forest Service and the Long Term Ecological Research have provided a standardized definition and classification for CWD, which makes data comparison on the landscape scale possible. Important characteristics of their definition include: (1) the minimum diameter (or at equivalent cross-section) of CWD≥10 cm at the widest point (the woody debris with diameter from 1 cm to 10 cm should be defined as fine woody debris, and the rest is litterfall), (2) sound and rotting logs, snags, stumps and large branches, located above the soil, and coarse root debris, larger than 1 cm in diameter. This classification has greatly facilitated CWD studies, helped comparison of different studies and is widely applied in other countries (particularly in North America). However, this classification is not widely known to forest ecologists in China and different definitions and criteria are still used by individual studies which makes many studies incomparable. This article attempts to review the recent progress in classifying CWD with emphasis on introducing the classification system of USDA Forest Service and the LTER. It is expected that the review will help facilitate the development of a standardized definition and classification suitable for forest ecosystems in China.更多还原