对南方公路常绿植物固碳释氧和降温增湿的研究

采用Li-6400便携式光合作用测定系统,对南方公路上常绿绿化植物净光合速率和气孔导度的日变化和蒸腾速率进行了测定,计算植物吸收二氧化碳和释放氧气的能力,以及植物的日蒸腾释水量和蒸腾吸热量.结果表明:固碳释氧能力较强的植物是扶芳藤、常春藤和珊瑚,较低的植物是红叶石楠、棕榈、麦冬.而降温增湿能力较高的是麦冬、石楠和扶芳藤,较低的是红叶石楠、棕榈.而植物叶片单位质量的叶绿素含量较高的是扶芳藤、常春藤,值分别是10.34、9.93 mg·g-1,较低的是麦冬、香樟、棕榈,值是3.55、2.67、2.06 mg·g-1.释氧量、净同化量和固碳量与叶绿素含量具有较好的相关性(P0.05).

Study on carbon-fixing,oxygen-releasing,temperature-reducing and humidity-increasing effects of evergreen plants in south highway

Li-6400 portable photosynthesis system,was used to test the diurnal variations of photosynthetic rate and stomatal conductance of evergreen plants in Southern Highway,and to calculate their ability of absorbing carbon dioxide and releasing oxygen and to calculate the transpiring water volume and absorbing heat quantity of plants. Results showed that Euonymus fortunei Hand-Mazz,Hedera helix. Aucuba eriobotryaefolia had better carbon-fixing and oxygen-releasing effects,while Photinia serrulata, Trachycarpus fortunei,Radix Ophiopogonis had worse carbon-fixing and oxygen-releasing effects. Radix Ophiopogonis,Photinia glabra,Euonymus fortunei Hand.-Mazz had higher cooling and humidification ability,while Photinia serrulata,Trachycarpus fortunei did not act as well as them. Euonymus fortunei Hand.-Mazz and Hedera helix had higher leaf chlorophyll in per unit mass,values are 12. 91、10. 34、9. 93 mg·g-1. Radix Ophiopogonis、Cinnamomum camphora（Linn.） Presl and Trachycarpus fortunei had lower leaf chlorophyll in per unit mass,value is 3. 55、2. 67、2. 06 mg·g-1. Releasing oxygen,fixing carbon,net assimilation and chlorophyll content has good correlation（P 〈 0. 05）.