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目的:研究甘草地向部分形态特征地理变异规律并分析其形成的生态学机制。方法:采用样方调查的方法测定全国8省区35个旗县甘草野生种群的地上植株形态特征,采用双重筛选逐步回归分析方法探讨甘草地上形态特征的地理变异规律及其形成的生态学机制。结果:(1)不同甘草野生种群的株高、侧枝数、侧枝角度、侧枝长度、复叶长度、小叶数、小叶长度和宽度8项形态指标的差异均达到了极显著水平(P<0.01);(2)各形态形态指标与产地年均温、日照百分率等气候因素密切相关。结论:甘草野生种群地上植株形态特征存在显著的地理变异,导致甘草种群产生地理变异的气候因子主要是光照因子,其次为温度因子和水分因子,其相关关系可用多元回归模型解释。
Objective: To study the law of geographical variation of licorice root to some morphological characteristics and to analyze its ecological mechanism. Methods: The morphological characteristics of aboveground plants of wild licorice in 35 flag counties in 8 counties and 8 counties of China were determined by the quadrat method. The geographical variation pattern of licorice morphological characteristics and its ecological mechanism were explored by double-screening stepwise regression analysis. Results: (1) There were significant differences among the eight morphological indexes of plant height, collateral number, collateral angle, collateral length, total length of lamina, leaf number, leaflet length and width in different wild licorice populations (P <0.01) ; (2) The climatic parameters of each morphological form are closely related to the climatic factors such as annual average temperature of origin, sunshine percentage and so on. CONCLUSION: The morphological characteristics of above-ground plants in Glycyrrhiza uralensis have significant geographical variation. The climatic factors that cause the geographical variation of Glycyrrhiza uralensis population are mainly light factor, followed by temperature factor and water factor. The correlation can be explained by multivariate regression model.