长白山牛皮杜鹃种群构件及其与土壤因子的灰色关联度

Grey Relatedness between the Modular Structure of Rhododendron chrysanthum Population and Soil Factors in Changbai Mountains

通过对不同海拔区内牛皮杜鹃种群构件的观察与测定,对其与土壤因子之间进行灰色关联度分析,以便获得更多关于牛皮杜鹃种群对土壤因子的生态适应性信息,从而揭示其生长及分布的相对稳定机理。结果表明:低海拔区牛皮杜鹃地径、株高、平均冠幅、株数、主茎节数、主茎节间长均最高,中海拔区牛皮杜鹃种群株高、平均冠幅、株数、主茎节数、主茎节间长具有较高变异性,变异系数分别为13.523%、19.850%、4.060%、20.282%、24.503%;低海拔区群落内土壤的养分贮量较中海拔区、高海拔区高;研究的9个土壤因子与各构件影响的灰色关联度基本在0.300 0以上,不同生长性状受不同土壤因子的控制,土壤全磷、全钾、有效磷、速效钾、全氮质量分数与各性状间的关联度均较高,是影响牛皮杜鹃种群分布和生长发育相对重要的土壤因子。

We studied the correlation between soil factors and the modular structure of Rhododendron chrysanthum population in different altitude range by analyzing the degree of relatedness adopted in the grey system theory. In low altitude area, the rhizome, the height, the average crown, the plant number, the main stem node number, and the main stem internode length of R. chrysanthum population were the highest. In intermediate altitude area, the height, the average crown, the plant number, the main stem node number, and the main stem internode length of R. chrysanthum population had higher variance, and the coefficient of variation were 13.523%, 19.850%, 4.060%, 20.282% and 24.503%, respectively. Soil nutrient storage of R. chrysanthum community in low altitude areas was higher than that in intermediate altitude area and high altitude area. The relatedness between the nine soil factors and the modules of the plant were higher relatively, which showed that the soil factors strongly affected the growth and development of R. chrysanthum population. Their values of grey relational grade were more than 0.300 0. Different growth traits were controlled by different soil factors. Total P, total K, availa- ble P, available K and total N in soil were comparatively highly related with soil factors for R. chrysanthum population, and they were as the dominant factors in controlling module index.