2种生境下红砂枝系构型特征

摘要

[目的]探究不同生境下红砂的枝系构型特征,并分析红砂植物构型对其生存的外在环境变异的适应策略.[方法]以荒漠地区超旱生小灌木红砂(Reaumuria soongorica)为研究对象,选择兰州九州台和张掖临泽2个样点,结合统计检验和分形理论的方法,通过分枝率、分枝长度、分枝角度、枝径比指标来研究2种生境下红砂的枝系构型变异特征.[结果]兰州九州台红砂和张掖临泽红砂的总体分枝率和逐步分枝率差异均不显著,兰州九州台红砂总体分枝率略大于张掖临泽红砂,逐步分枝率呈现出兰州九州台红砂略小于张掖临泽红砂.兰州九州台红砂各级分枝枝长均显著长于张掖临泽红砂,且兰州九州台红砂和张掖临泽红砂枝条伸展能力从第1级到第4级呈相对减弱趋势.兰州九州台红砂和张掖临泽红砂的分枝角度差异显著,总体上兰州九州台红砂各级分枝角度显著大于张掖临泽红砂,从1级到4级分枝角度呈明显减小趋势,角度均小于90°.兰州九州台红砂各级枝径比显著高于张掖临泽红砂,即兰州九州台红砂的承载力显著高于张掖临泽红砂.[结论]研究结果为深入了解红砂内部结构及其对环境的生态适应性提供了理论依据.%[Objective] The aim was to study plant architecture characteristics of Reaumuria soongorica in two different ecological habits,and analyze the adaptive strategy of plant architecture characteristics of Reaumuria soongorica to external environment variation.[Method] Taking the super-xerophobic shrub Reaumuria soongorica as research object,we selected two samples of Jiuzhoutai of Lanzhou City and Linze of Zhangye City.Based on the method of statistical test and fractal theory,we studied the branching variability of Reaumuria soongorica by branching rate,branch length,branching angle and branch diameter ratio index.[Result] There was no significant difference in the overall branching rate and gradual branching rate of Reaumuria soongorica between Jiuzhoutai of Lanzhou City and Linze of Zhangye City;the overall branch rate of Reaumuria soongorica in Jiuzhoutai of Lanzhou City was slightly larger than that of Linze of Zhangye City,and the gradual branching rate of Reaumuria soongorica in Jiuzhoutai of Lanzhou City was slightly less than that in Linze of Zhangye City.Jiuzhoutai of Lanzhou City Reaumuria soongorica at all levels of branching branches were significantly longer than Linze of Zhangye City Reaumuria soongorica red sand at all levels of branch length.Jiuzhoutai of Lanzhou City Reaumuria soongorica and Linze of Zhangye City Reaumuria soongorica branch stretching ability from the first level to the fourth level showed a relatively weakening trend.There were significant differences in the branching angle between Jiuzhoutai of Lanzhou City Reaumuria soongorica and Linze of Zhangye City Reaumuria soongorica.On the whole,Jiuzhoutai of Lanzhou City Reaumuria soongorica at all levels of branching angle was significantly greater than Linze of Zhangye City Reaumuria soongorica at all levels of branching angle.From 1 to 4 branch angle showed a significant reduction in the trend,the angle was less than 90°.Jiuzhoutai of Lanzhou City Reaumuria soongorica at all levels of branch diameter ratio was significantly higher than Linze of Zhangye City Reaumuria soongorica at all levels branch diameter ratio,that is,the carrying capacity of Jiuzhoutai of Lanzhou City Reaumuria soongorica was significantly higher than that of Linze of Zhangye City Reaumuria soongorica.[Conclusion] The results provide theoretical basis for understanding the internal structure of Reaumuria soongorica and the ecological adaptability to environment.