中文摘要：

我们调查了数量和质量掉落登录在 Tianbaoyan 国家自然保护区的不同 Tsuga longibracteata 森林社区。我们使用了冗余性分析决定空间分发掉落登录不同森林社区并且在看台结构，地志的因素和人的骚乱之中分析关系。卷，盖住的区域，吝啬的日志长度和掉落的日志的数字在森林类型之中显著地不同(P < 0.05 ) ，但是在胸高度的吝啬的直径没显示出重要差别(P > 0.05 ) 。在不同森林类型的木头体积和盖住的区域显示出下列趋势：T。longibracteata 纯森林 < T。longibracteata + Oligostachyum scabriflorur < T。longibracteata + 硬木 < 杜鹃花属 simiarum + T。longibracteata < T。longibracteata + Phyllostachys heterocycla pubescens。日志数量和质量的空间分发模式显示那日志卷和盖住的区域被环境因素强烈在下列顺序影响：人的骚乱 > 举起 > 斜坡位置 > 树干高度 > 树高度 > 斜坡方面 > 密度 > 基础区域 > 斜坡坡度。全部的变化上的环境变量的相对贡献是地形学(76%)> 骚乱(42%)> 看台结构(35%) 。联合的地形学和骚乱解释了 83% 变化。掉落的木头数量和质量否定地与举起和斜坡位置有关，并且断然被联系到人的骚乱。木头体积减少了从对南部的斜坡北。环境因素在一级上有最高的影响(稍微腐烂了) ，并且班 V 上的最低影响(高度腐烂了) 。

英文摘要：

We investigated the quantity and quality 0f fallen l0gs in different Tsuga l0ngibracteata f0rest c0mmunities in the Tianba0yan Nati0nal Nature Reserve. We used redundancy analysis t0 determine the spatial distributi0n 0f fallen l0gs in the different f0rest c0mmunities and t0 analyze the relati0nships am0ng stand structure, t0p0graphic fact0rs and human disturbance. The v0lume, c0vered area, mean l0g length and number 0f fallen l0gs differed significantly am0ng f0rest types （P 〈 0.05）, but mean diameter at breast height sh0wed n0 significant difference （P 〉 0.05）. The l0g v0lume and c0vered area in different f0rest types sh0wed the f0ll0wing trend： T. l0ngibracteata pure f0rest 〈 T. l0ngibracteata ＋ Olig0staehyum scabrifl0rur 〈 T. l0ngibraeteata ＋ hardw00d 〈 Rh0d0dendr0n simiarum ＋ T. l0ngibraeteata 〈 T. l0ngibraeteata ＋ Phyll0stachys heter0cycla pubescens. The spatial distributi0n patterns 0f l0gs quantity and quality indicated that l0g v0lume and c0vered area were str0ngly affected by envir0nmental fact0rs in the f0ll0wing 0rder： human disturbance 〉 elevati0n 〉 sl0pe p0siti0n 〉 b0le height 〉 tree height 〉 sl0pe aspect 〉 density 〉 basal area 〉 sl0pe gradient. The relative c0ntributi0n 0f envir0nmental variables 0n the t0tal variance was t0p0graphy （76%） 〉 disturbance （42%） 〉 stand structure （35%）. T0p0graphy and disturbance c0mbined explained 8.2% 0f the variance. Fallen l0~s auantitv and aualitvwere negatively related t0 elevati0n and sl0pe p0siti0n, and p0sitively ass0ciated t0 human disturbance. The l0g v0lume decreased fr0m n0rthern t0 s0uthern sl0pes. Envir0nmental fact0rs had the highest impact 0n class I （slightly decayed）, and l0west impact 0n class V （highly decayed）.