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作 者 ：裴保华, 郭进起, 张素菊

期 刊 ：植物生态学报 1996年 20卷 3期 页码：272-278

关键词：耐阴性；741杨；全日照；喜光树种；

Keywords:Shade tolerance, 741 poplar, Full light, Light tree species,

摘 要 ：用黑色遮阴网遮光，研究了741杨嫩枝扦插苗的耐阴性。共设置全日照(对照)、全日照的24.5％、7.5％和2.5％等4种光量。研究了光强对叶生长、叶解剖构造、叶绿素含量、光-光合曲线、新梢生长和生物量等指标。结果表明，741杨是一种喜光树种，在全日照下生长，其生物量等多项指标都高于各种遮光处理。741杨对24.5％光量有较强的适应补偿能力，其单片叶面积、新梢生长率、叶绿素含量、叶柄长度等都超过对照,但生物量还是低于对照34.4％。7.5％光量处理已接近741杨的耐阴极限。741杨扦插苗不能长期在2.5％的光量下生活。

Abstract:Using black shading net, we set up four light conditions (e. g. 100%, 24.5%, 7.5% and 2.5% of full light) under which the cuttings of poplar grown. The effects of light intensity on leaf growth, leaf anatomic structure, chlorophyll content, light-photosynthesis curve, growth of newly produced sprouts and biomass were investigated. The results show that 741 poplar is a light tree species. Biomass and other parameters were all higher under 100% light than the other light conditions. The plants had a strong compensation at the level of 24.5% of full light. The single leaf area, growth rate of newly produced sprouts, chlorophyll content and petiole length were larger, but total biomass was smaller, under full light than 34.4% of full light conditions. Under 7.5% of full light, the plants reached their limitation of shade tolerance. The plants were not able to survive for long term under 2.5% of full light conditions.

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