苏州主要园林树种的光合固碳能力对比分析

园林树种的光合固碳能够维持城市空气中CO2和O2的平衡。以苏州地区32个园林树种为材料,利用Li-6400便携式光合作用仪测定了其光合日变化,并利用测定结果计算其日净固碳能力,再以聚类分析法对其日净固碳量进行分类。结果如下:第1类日净固碳量极高,17.55~18.76 g/(m2·d)]有紫荆、枫杨、垂柳,第2类日净固碳量高,12.25~16.02 g/(m2·d)]有大叶女贞、乌桕、榉树、枫香树、垂丝海棠、樱花、夹竹桃,第3类日净固碳量中等,8.57~11.97 g/(m2·d)]有银杏、红花檵木、朴树、乐昌含笑、红叶李、杜英、海桐、金边黄杨、杜鹃、重阳木、樟树、金丝桃、红叶石楠,第4类日净固碳量低,3.81~7.64 g/(m2·d)]有红枫、洒金东瀛珊瑚、金叶女贞、八角金盘、五角枫、鹅掌楸、紫薇、木芙蓉、桂花。上述分析结果可对苏州的园林规划及树种选择提供一定的理论指导。

Comparative analysis of photosynthetic carbon fixation ability of main landscape tree species in Suzhou City

Photosynthetic carbon fixation of landscape tree species can maintain the equilibrium between C02 and 02 in the city. We selected 32 landscape tree species in Suzhou City to gain the photosynthetic diurnal variation by a portable LI - 6400 photosynthesis system, and their diurnal carbon fixation capability also calculated. Cluster analysis on diurnal net carbon fixation revealed that they could be divided into 4 categories ： first high, 17.55 - 18.76 g/（ m2 · d） ] ： Cercis chinensis, Pterocarya stenoptera, Salix babylonica; second rather high, 12.25- 16.02 g/（ m2 ·d）] ： Ligustrum lucidum, Sapium sebiferum, Zelkova schneideriana, Liquidambar formosatta, Malus halliana, Prunus serrulata, Nerium indicum ; third middle, 8.57 - 11.97 g/（ m2 · d） ] ： Ginkgo biloba, Lorpetalum chinense var. rubrum, Celtis sinensis, Michelia chapensis, Prunus ceraifera cv. Atropurpurea, Elaeocarpus sylvestris, Pittosporum tobira, Euonymus japonicus cv. Aureo - ma, Rhododen- dron simsii, Bischofia polycarpa, Cinnamomum camphora, Hypericum monogynum, Photinia fraseri ＇ Red Robin＇ ; and fourth low, 3.81 - 7.64 g/（ m2 · d） ] ： Acer palmatum cv. Atropurpurea, Aucuba japonica var. variegata,Ligustrum x vicaryi , Fatsia japonica ,Acer mono , Liriodendron chinensis , Lagerstroemia indica , Hibiscus mutabilis , Osmanthus fragrans.