长白山北坡木本植物分布与环境关系的典范对应分析

 在长白山北坡海拔700～2 600 m的坡面上，海拔每上升100 m设立一个样点，共计20个样点。调查每个样点中木本植物的生态重要值，并计测样点内包括气候、土壤、林冠郁闭度在内的13个环境因子。应用CANOCO3.12软件对获得的数据进行了典范对应分析(CCA)，应用CANODRAW3.0作出了种类

CANONICAL CORRESPONDENCE ANALYSIS ON RELATIONSHIP OF WOODY PLANTS WITH THEIR ENVIRONMENTS ON THE NORTHERN SLOPE OF CHANGBAI MOUNTAIN

The study of the relationship of plants with their environment is very important for understanding biodiversity patterns. On the northern slope of Changbai Mountain there is not only a high diversity in vegetation types and species, but also high variation in diversity pattern along the altitude gradient. It is a perfect transect for the research of biodiversity and gradient patterns. From 700 m to 2 600 m on northern slope of Changbai Mountain, twenty sites were sampled at an interval of 100 m along the altitude gradient. At each site the ecologically important values of woody species, together with thirteen environmental variables including weather, soil factors and canopy density, were obtained. The data were analyzed by Canonical correspondence analysis (CCA) and CANOCO 3.12. The species (or sites)_environment biplots of CCA were automatically mapped using CANOCO 3.0, and the relationships between the ecological distribution of the species and communities with the thirteen environmental factors were clearly revealed on these biplots. The results also showed: 1) the gradient variances of the weather factors on the northern slope have important influences on the form of the distribution patterns of the woody plants; 2) the factors influencing the ecological distribution of the tree species ranked as temperature, precipitation, soil factors and canopy density based on their importance, those on the shrub species ranked as precipitation, canopy density, temperature and soil factors; 3) on the whole northern slope, the influence degree of the soil factors on the ecological distribution was different between the shrub species and tree species based on the correlation coefficients of CCA. Among the soil effective phosphor, soil effective nitrogen, soil organic substances, and soil effective K, only the latter was statistically related with the ecological distribution of the tree species.