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南亚热带五种树种幼苗光合特征

唐敬超1,刘萍2,史作民1,3*,罗达1,刘世荣1#br#   

  1. 1中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091; 2北京林业大学经济管理学院, 北京 100083; 3南京林业大学南方现代林业协同创新中心, 南京林业大学, 南京 210037)
  • 出版日期:2016-09-10 发布日期:2016-09-10

Photosynthetic performance of five tree species seedlings in subtropical China.

TANG Jing-chao1, LIU Ping2, SHI Zuo-min1,3*, LUO Da1, LIU Shi-rong1#br#   

  1. (1 Key Laboratory on Forest Ecology and Environmental Sciences of State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; 2 School of Economic and Management, Beijing Forestry University, Beijing 100083, China; 3 CoInnovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China).
  • Online:2016-09-10 Published:2016-09-10

摘要: 以降香黄檀(Dalbergia odorifera)、顶果木(Acrocarpus fraxinifolius)、格木(Erythrophleum fordii)、红锥(Castanopsis hystrix)和西南桦(Betula alnoides)等树种幼苗为研究对象,对其叶片的光合特征进行研究。结果表明,降香黄檀、西南桦与顶果木具有较高的光饱和点(LSP)及光补偿点(LCP),较为喜光;红锥及格木则具有较低的LCP及LSP,较为耐荫。降香黄檀和顶果木都具有较高的光饱和净光合速率(Amax),但降香黄檀的羧化效率(CE)最高,CO2补偿点(CCP)最低,气孔导度(gs)及胞间CO2浓度(Ci)却并不高,这表明其羧化酶较高的CO2羧化能力是造成其较高Amax的主要原因;而顶果木则是CE、gsCi都较高,CCP较低,羧化酶羧化能力与CO2提供能力都较强,因此光合能力较强。虽然西南桦有最高的gs及Ci,但较高的CCP及较低的CE限制了其光合能力;格木以及红锥则是gs、Ci与CE都较低,CCP较高,羧化能力与CO2提供能力都较弱,因而光合能力较弱。

关键词: 气候变化, 时空变化, 冬种作物, 极端灾害, 气候资源, 气象灾害

Abstract: Leaf photosynthetic characteristics of five tree species, i.e. Dalbergia odorifera, Acrocarpus fraxinifolius, Erythrophleum fordii, Castanopsis hystrix and Betula alnoides seedlings were studied in this paper. The results showed that D. odorifera, B. alnoides and A. fraxinifolius had higher light saturation point (LSP) and light compensation point (LCP) than C. hystrix and E. fordii, so that the former group could make better use of highintensity illumination, while the later group could tolerate shading. High utilization capacity of CO2 (i.e. lower carbon dioxide compensation point (CCP) and higher carboxylation efficiency (CE)) enabled D. odorifera with high photosynthetic capacity. Balanced supply capacity of CO2 (i.e. stomatal conductance (gs) and intercellular CO2 concentration (Ci)) and utilization capacity of CO2 enabled A. fraxinifolius with high photosynthetic capacity too. Although B. alnoides had high capacity of supplying CO2 to photosynthetic apparatus, low capacity of using CO2 limited its photosynthetic capacity. E. fordii and C. hystrix had low supply and utilization capacity of CO2, resulting in their lower photosynthetic capacity than the other tree species.

Key words: climate change, climate resource, meteorological disaster, winter planting, spatio-temporal change, extreme disaster.