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OALib Journal期刊
ISSN: 2333-9721
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不同光环境对中国南方草地3种灌木表型可塑性的影响
DOI: 10.3724/SP.J.1145.2014.03029, PP. 962-970
Keywords: 南方草地,巴柳,川莓,马桑绣球,光环境,植物形态特征,生物量分配,表型可塑性
Abstract:
为了解不同光环境下灌木的表型可塑性，在重庆云阳县天然的灌木林和灌草丛中，选择3种主要灌木巴柳（salixetosia）、川莓（rubussetchuenensis）和马桑绣球（hydrangea?aspera），研究两种光环境（林外和林内）下植物形态、生物量分配和表型可塑性的变化.结果表明：与林外高光环境相比，林内低光环境下，马桑绣球的株高、冠幅、冠面积、单叶面积、比叶面积、新枝和老枝生物量分配均表现出显著增大（p<0.05），而根冠比对数值却显著减小（p<0.05），根生物量分配变化则不显著（p>0.05）；川莓则仅单叶面积、比叶面积、根生物量分配显著增大（p<0.05），而巴柳的各个形态指标在高光和低光下差异不显著（p>0.05）.此外，马桑绣球和川莓的形态和整体可塑性显著高于巴柳（p<0.05），生物量分配可塑性在不同光环境下差异不显著（p>0.05）.由此可见，异质光环境对不同灌木形态特征和生物量分配的影响存在物种特异性，马桑绣球和川莓在不同光环境下表现出更强的表型可塑性.
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