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作 者 ：史刚荣;李 慧

期 刊 ：植物研究 2006年 26卷 6期 页码：722-727

关键词：恢复演替；优势种；水分生理；抗旱性；表型可塑性；

Keywords:resume succession, dominant species, water physiology, drought resistance, phenotypic plasticity,

摘 要 ：对淮北相山不同恢复演替阶段植被中4个优势树种叶片的水分生理指标进行研究，结果表明：在同一生境(混交林)下，广布优势种（酸枣和牡荆）比局部优势种（柘树和构树）具有更强的耐旱性，但后者的资源获取能力更强，生长速度更快；酸枣和牡荆的耐旱机理不同，酸枣为低水势耐旱植物；牡荆为高水势耐旱植物。酸枣和牡荆的叶片水分生理指标均随群落环境的不同而表现出一定表型可塑性，它们在不同群落中的耐旱性依次为：混交林林内>混交林林缘>灌丛>灌草丛>人工侧柏林。生理可塑性导致酸枣和牡荆具有更宽的生态幅和更强的耐旱性，这是它们在相山成为广布优势种的重要原因。

Abstract:Water physiological was on four dominant species in different successional communities on Mountain Xiangshan,Huaibai,China,The results showed that the two widely distributed dominant species(Zizyphus jujuba var. spinosa,Vitex negundo var. cannabifolia) show more drought resistance than the two locally distributed dominant species(Cudrania tricuspidata,Broussonetia papyrifera) in the same community(the mixed forest),while the latter have greater capabilities of resource harvesting and growing than the former. Z.jujuba var. spinosa and V.negundo var. cannabifolia are different in drought enduring mechanism,and the former belong to lower water potential drought enduring plant,while the latter belong to higher water potential drought enduring plant.Both of Z.jujuba var. spinosa and V.negundo var. cannabifolia show great physiological plasticity in response to different community environment,their drought resistance in different community is ordered as: the inner mixed forest>the edge of mixed forest>shrub>shrub-herb>Platycladus orientalis forest.The strong drought tolerance and wide ecological amplitude due to great physiological plasticity may be the important reason why Z.jujuba var. spinosa and V.negundo var. cannabifolia be the two widely distributed dominant species on Mountain Xiangshan.

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