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以大连市园林6种常用园林树种为研究材料,利用LI-6400便携式光合测定仪测定树木的光合生理生态指标,对6种树种的光合固碳释氧能力、光响应参数以及光合速率影响因子进行分析。结果表明:在不同季节同种植物的单位叶面积固碳释氧能力表现为夏季最强。日均单位叶面积固碳释氧能力由强到弱为龙爪槐(Sophora japonica var.pendula)>合欢(Albizia julibrissin)>光叶榉(Zelkova serrata)>槲树(Quercus dentata)>悬铃木(Platanus acerifolia)>枫杨(Pterocarya stenoptera);日均单株固碳释氧能力由强到弱为悬铃木>槲树>合欢>光叶榉>枫杨>龙爪槐。气孔导度、蒸腾速率、光合有效辐射和大气CO2浓度是影响光合速率的主要因子。悬铃木、合欢对环境的适应能力较强。根据树种的固碳释氧能力及生理特性,建议在大连地区进行绿化时优选悬铃木、合欢,槲树、龙爪槐也可作为高固碳树种推广。
Taking the six kinds of common garden tree species in Dalian city as the research materials, the photosynthetic physiological and ecological indexes of trees were determined by LI-6400 portable photosynthesis tester. The photosynthetic carbon releasing oxygen capability, light response parameters and photosynthetic rate affecting factors analysis. The results showed that in different seasons, the same plant’s leaf area per unit area showed the strongest carbon sequestration and oxygen release performance in summer. The average carbon flux and oxygen release capacity per unit area of leaves from Sophora japonica var.pendula> Albizia julibrissin> Zelkova serrata> Quercus dentata> Platanus acerifolia> Pterocarya stenoptera. The ability of carbon sequestration and releasing oxygen per plant per day was from high to low as Platanus mongolica> Acacia> Acacia> Zelkova schneideriana> Maple> Yangjiaohuai. Stomatal conductance, transpiration rate, photosynthetically active radiation and atmospheric CO2 concentration were the main factors affecting photosynthetic rate. Platanus, Acacia strong adaptability to the environment. According to the carbon sequestration and oxygen release ability of the tree species and their physiological characteristics, it is suggested that Platanus, Acacia, Oxytropis and Longjiaohuai should be popularized as high carbon sequestration in the afforestation in Dalian.