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OALib Journal期刊
ISSN: 2333-9721
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3种乔木叶片反射光谱与光合特性随树高的变化
DOI: 10.3724/SP.J.1145.2013.00383, PP. 383-388
Keywords: 树高,反射光谱,pri,光合特性,阔叶红松林,蒙古栎,紫椴,红松
Abstract:
树木生长到一定高度阶段，顶部叶片会受到水分运输阻力的影响，表现为叶片水分亏缺，进而引发其他生理特性的变化.本研究比较了阔叶红松林3种高大乔木（蒙古栎quercusmongolica、紫椴tiliaamurensis、红松pinuskoraiensis）不同高度植株叶片的反射光谱特征（光谱反射率r、光化学反射指数pri）和光合特性（光合速率pn、蒸腾速率tr、气孔导度cond）的变化.结果表明：随树木高度增加，蒙古栎和紫椴叶片的pri和各项光合参数先升高后下降，各高度间差异显著（p<0.05）；红松的各项参数则随树高增加而增加，无下降趋势.分析表明，蒙古栎和紫椴高树pn的下降很可能受到缺水胁迫的影响，但由于物种间可能存在不同的气孔调节机制，红松未表现出水分亏缺.另外，蒙古栎和紫椴的pri指数与其pn成显著正相关关系（分别为r2=0.986、0.890），但在红松叶片中pri指数并不能反映pn的变化，表明在使用pri指数监测植物光合能力时要考虑物种间的差异.图3表1参26
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