低海拔区2种光照强度对猴头杜鹃光合特性的影响  

Effects of Different Illumination Intensity on Photosynthetic Properties of Rhododendron simiarum at Low Altitude

作　　者：杨华[1] 宋绪忠[1] YANG Hua;SONG Xu-zhong(Zhejiang Academy of Forestry,Hangzhou 310023,China)

机构地区：[1]浙江省林业科学研究院,浙江杭州310023

出　　处：《浙江林业科技》2018年第3期24-29,共6页Journal of Zhejiang Forestry Science and Technology

基　　金：浙江省林木新品种选育重大科技专项"特色优势木本花卉资源保育与种质创新"(2016C02056-12)

摘　　要：利用LI-6400便携式光合作用仪对10%光照和全光照下低海拔生长的猴头杜鹃Rhododendron simiarum的光合特性进行测定。光响应曲线分析结果显示,净光合速率表现为10%光照>全光照,夏季在低海拔环境下猴头杜鹃适应遮荫的环境;10%光照下生长的猴头杜鹃蒸腾速率明显低于全光照下生长的猴头杜鹃,水分利用效率明显高于全光照下生长的猴头杜鹃;10%光照下生长的猴头杜鹃有利于干物质的积累;2种光照强度下的猴头杜鹃净光合速率、蒸腾速率、气孔导度日变化均表现为"单峰"型;气孔限制值与胞间CO2浓度的日变化表现为"双峰"型。In March of 2015,10 young Rhododendron simiarum trees were transplanted as potted culture from Songyang(altitude:1 000 m)of Zhejiang province to Zhejiang Academy of Forestry(altitude:24 m).In May of 2016,treatments of 10%of illumination and full exposure were carried out on 5 trees each.In July of 2016,determinations were implemented on their photosynthetic properties by LI-6400.The results showed that net photosynthetic rate(Pn)of R.simiarum trees under 10%illumination was higher than that under full exposure,indicating more adaptive to low light intensity at low altitude in the summer.Transpiration rate(Tr)of trees under 10%illumination was lower than that under full exposure,but water use efficency(WUE)was the opposite.R.simiarum under 10%light had more accumulation of dry matter.The diurnal variation of Pn,Tr and Gs was single-peak curve,but Ls and Ci had double-peak curve.

关 键 词：猴头杜鹃 遮荫 光合特性 光照 

分 类 号：S718.5[农业科学—林学]