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枝叶生长关系是植物在环境胁迫条件下提高空间资源利用能力的一种策略,弄清枝叶生长关系对理解植物应对环境异质性的表型可塑性具有重要意义。该文利用Arc GIS建立研究区域的数字高程模型,研究了兰州市北山不同坡向人工林刺槐(Robinia pseudoacacia)小枝茎截面积-总叶面积和出叶强度-单叶面积的生长关系。结果表明:随着坡向由北坡向东坡、南坡和西坡转变,刺槐林群落的郁闭度、高度和土壤含水量呈现先减小后增大的趋势,刺槐小枝茎截面积、总叶面积和单叶面积呈现先减小后增大的趋势,出叶强度呈现先增大后减小的趋势;北坡、东坡、南坡和西坡4个坡向的刺槐小枝的茎截面积和总叶面积均呈显著的正相关关系(p<0.05),并存在显著大于1的共同斜率,刺槐的出叶强度与单叶面积均呈显著的负相关关系(p<0.05),并存在接近于–1的共同斜率;随着坡向由北坡向东坡、南坡和西坡转变,茎截面积-总叶面积和出叶强度-单叶面积两组关系的回归方程截距呈现先减小后增大的趋势。刺槐枝叶在不同坡向上的异速生长关系反映了植物功能性状对生长环境的响应和适应,以及植物构型构建的投资权衡机制。
The relationship between the growth of branches and leaves is a strategy of improving the utilization of space resources under environmental stress. It is of great significance to understand the relationship between the growth of branches and leaves to understand the phenotypic plasticity of plants in response to environmental heterogeneity. In this paper, the digital elevation model of the study area was established by using ArcGIS. The relationship between the branchlet stem area, the total leaf area and the leaf area per leaf area of Robinia pseudoacacia was studied. The results showed that with the slope changing from north slope to east slope, south slope and west slope, the canopy density, height and soil water content of Robinia pseudoacacia community firstly decreased and then increased. The cross-sectional area of stems, The total leaf area and single leaf area showed the trend of decreasing first and then increasing, leaf strength first increased and then decreased; the stems of four locust branches of north slope, east slope, south slope and west slope There was a significant positive correlation between leaf area and total leaf area (p <0.05), and there was a common slope that was significantly larger than 1. There was a significant negative correlation between leaf area and leaf area (p <0.05) And there is a common slope close to -1. As the slope changes from north slope to east slope, south slope and west slope, the regression equation of the relationship between stem cross-sectional area-total leaf area and leaf strength-leaf area From the first show the trend of decreasing and then increasing. The heterotrophic growth of Robinia pseudoacacia branches and leaves in different slopes reflects the response and adaptation of plant functional traits to the growth environment and the trade-off mechanism of plant architecture.