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中文摘要：
为研究北京东灵山辽东栎（Quercus liaotungensis）不同层植物的分布与环境因子之间的关系,对东灵山辽东栎林进行了植物群落学调查。沿海拔梯度在乔木层、灌木层和草本层各调查119个样方,同时调查了每个样方的环境因子如海拔、坡度和坡位。物种数据采用二元属性数据,对非数值环境因子进行赋值。对东灵山辽东栎林和各环境因子进行去趋势典范对应分析（Detrended canonical correspondence analysis,DCCA）,结果表明：DCCA第一轴基本上反映了植物群落所处环境的海拔的梯度变化,第二轴基本上反映了坡位的梯度变化。同时发现辽东栎林大多数植物分布在低海拔区域。乔木层的物种分布比较均匀。草本层的物种分布重叠率是最大的,说明草本植物的生境相似性很高。低海拔区域的生物多样性要高于高海拔区域的生物多样性。结合环境因子间的相关关系和DCCA排序结果,发现海拔是影响东灵山辽东栎林物种分布的主要环境因子。
英文摘要：
Aims Our objective was to study the relationship between plant species and environmental factors for different strata of a Quercus liaotungensis forest along an altitudinal gradient in Dongling Mountain, Beijing, China. Methods We collected 119 vegetation samples separately in the tree, shrub and herb layers along an altitudinal gradient and recorded environmental factors such as altitude and slope inclination and position. We used detrended canonical correspondence analysis （DCCA; CANOCO 4.5） to determine the main environmental factors related to the distribution of plant communities. Important findings The DCCA axis 1 reflected the gradiem in altitude, while axis 2 reflected slope position. Most species occurred at lower altitude. Species in the tree layer were distributed uniformly. A big overlap in the composition of the herb layer indicated that the microenvironment for species was similar. Species diversity increased from high to low altitude. According to the correlations among environment factors and results of the DCCA ordination, the most important factor affecting species distribution in this region was altitude.
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