中文摘要：

在四川栗子坪自然保护区大熊猫活动密集区设点，就原始林与次生林中大熊猫微生境结构进行了比较研究．本文比较分析了坡度、坡位等25个反映大熊猫生境结构的变量，单因素方差分析结果显示，原始林与次生林各变量间均存在差异，其中乔木郁闭度、乔木高等15个变量差异显著．逻辑斯蒂回归分析结果表明，乔木数、乔木郁闭度、灌木高度、死亡竹子数等因素对区分原始林与次生林有显著贡献．另外，林下灌丛（包括大熊猫所食竹类）对大熊猫生境选择亦具有较大影响．研究结果表明，大熊猫对乔木的选择是源于对有一定郁闭度的原始林中综合因素的选择，由于砍伐等原因，次生林的植被结构发生了变化，显著影响了竹子的生长．

英文摘要：

Fieldwork was carried out at giant panda living district of SiChuan LiZiPing nature reserve. Its purpose was to make a comparative researching of the microhabitat structures of giant panda in old growth and secondary forests. The paper analysed 25 variables reflecting the giant panda habitat structure, such as slope ,slope positions by one way ANOVA. The result shows significant difference in 15 variables, such as trees crown density and trees height . And then the logistic regression shows trees umber,trees crown density ,shrubs height,and bamboo deaths have great contribution to distinguishing old growth and secondary forest. And, underbrush （include bamboo） also considerably affects the selection of giant panda＇s habitat. The results proves that Giant Panda＇s choosing trees is rooted in integrated factors, including the right crown density in old growth. The deforestation, and the secondary vegetation structure changes,have had significant influence on the growth of the bamboo.