中文摘要：

以小兴安岭典型阔叶红松林大面积固定样地（9hm2）为对象,分析粗木质残体（CWD）的物种组成及数量特征、径级结构、存在形式、腐烂等级,揭示小兴安岭阔叶红松林CWD的基础特征。结果表明：9hm2典型阔叶红松林固定样地内共计有胸径≥2cm的CWD3418株（由于高度腐烂鉴别不出种的CWD有864株,占总个体数的25.3%）,CWD的密度、胸高断面积和体积分别为380株.hm-2、15.80m2.hm-2和90.1m3.hm-2;花楷槭和枫桦是阔叶CWD的主要组成树种,红松和冷杉是针叶CWD的主要组成树种;针叶树种的胸高断面积（9.12m2.hm-2）和体积（57.68m3.hm-2）分别达到总体CWD的57.7%和64%;在各存在形式下不同种的CWD数量随着径级的增加而减少,均呈反J型;除未知种以外,其他CWD都主要以枯立木、干基折断和干中折断形式存在;针叶树种根桩形式CWD的数量随着径级的增加而增加,这一规律有别于其他种;样地内各树种CWD腐烂等级都大致呈正态分布,主要集中在Ⅱ和Ⅲ腐烂等级上;除针叶树种的Ⅴ腐烂等级外,各树种不同腐烂等级CWD的数量都随着径级的增加呈减少的趋势。

英文摘要：

The species composition,DBH（diameter at breast height） class,existing form,decay class of coarse woody debris （CWD） were studied in a large permanent plot （9 hm2 ） of a typical mixed broad-leaved korean pine forest in Xiaoxing＇an Mountains. All CWDs with DBH ≥2 cm were tagged,mapped,measured （ girth） with species identified. Important findings：a total of 3 418 CWD individuals with DBH ≥2 cm were recorded in the 9 hm2 plot among which the species of 864 CWD individuals were not able to be identified due to serious decay,accounted for 25. 3% of the total samples recorded. The CWD density,basal area and volume were 380 indivadual.hm -2,15. 80 m2.hm -2 and 90. 1 m3.hm -2,respectively. Acer ukurunduense and Betula costata were the major broad-leaved tree species while Pinus koraiensis and Abies nephrolepis were the major coniferous tree species. The basal area （9. 12 m2.hm -2 ） and volume （57. 68 m3.hm -2） of CWDs from coniferous tree species accounted for 57. 7% and 64% of the total basal area and volume,respectively. The density of different types of CWDs decreased as increase of DBH class,and followed the inverse J-shape. The CWD existing forms was mainly composed of standing die,breakage at rootstock and breakage at trunk. Density of conifer stump CWDs increased with the DBH class. The decay classes of CWD followed normal distribution with a focus of decay class Ⅱ and Ⅲ,suggesting that the input and output of CWD was largely balanced in the mixed broad-leaved korean pine forest. Except the CWD of coniferous tree species with decay class V,the decay class of the rest of CWDs decreased with increase of DBH class.