主要城市绿化树种苗木耗水特性研究

利用Licor-6400便携式光合作用测定系统,对18种盆栽城市绿化苗木的蒸腾耗水特性进行了测定.结果表明,针叶树种耗水速率低于阔叶树种.针叶树种中日最大耗水速率以油松(Pinus tabulaeformis)最大(35.83g/h),侧柏(Platycladus orientalis)最小(17.15g/h);阔叶树种中,火炬树(Ehus typhina)、刺槐(Robina pseudoacacia)、元宝枫(Acer mono)、紫穗槐(Amorpha fruticcosa)耗水速率的最大值分别达5

Water Consumption Traits of Several City Greening Seedlings

Water consumption traits of 18 potted young seedlings for city greening were measured by Licor-6400 portable photosynthesis system and other equipments. The results indicated that the average water consumption rate of broadleaf trees was more than conifer trees. Among conifer trees, Pinus tablaeformis(35. 83 g/ h)and Platycla-dus orentalis( 17. 15 g/h) have the maximum and minimum water consumption rate respectively. The maximum of broadleaf trees such as Rhus typhina, Robina pseudoacacia, Acer mono, Amorpha fruticcosa reached as high as 50.18 g/h,43.67 g/h,46.267 g/h and 43.73 g/h respectively. Similarly, amount of water consumption per day of broad leaf tree's was obviously higher than conifer trees. The order of water consumption amount per day from high to lower among the broadleaf trees was Rh. typhina, A. mono, A. fruticcosa, Ulumus pumila and R. pseudoacacia, but that of conifer trees was P. tabulaefornis, P. ponderosa, Juniperus formosana, Sabina procumbens, P. densiflo-ra, P. nigra var. austriaca and Platycladus orientalis.