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，但总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。
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, ligtphotosynthesis 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 pettole 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.
出处
《植物生态学报》
CAS
CSCD
北大核心
1996年第3期272-278,共7页
Chinese Journal of Plant Ecology
关键词
杨
耐阴性
741杨
扦插苗
Shade tolerance
741 poplar
Full light
Light tree species
