扬州古运河风光带绿地树种固碳释氧效应初步研究

Carbon fixation and oxygen release of landscaping trees along the Grand Canal in Yangzhou

比较分析了扬州古运河风光带绿地组成植物的固碳释氧效应。对19个树种单株单位土地面积的日固碳释氧能力进行了聚类分析，将它们分为3类：单株日固碳释氧量〉65，26-58和〈8g·m^-2·d^-1。金叶女贞Ligustrum quihoui的单株日固碳释氧量最高，分别为115．012和83．6380g·m^-2·d^-1，刺槐Robinia pseudoacacia和垂柳Salix babylonica的固碳释氧量均较高；桃Amygdalus persica，夹竹桃Nerium indicum，金钟花Forsythia viridissima，蜡梅Chimonanthus praecox也具有较好的固碳释氧能力；香橼Citrus medica，日本珊瑚树Viburnum awabuki，迎春Jasminum nudiflorum，桂花Osmanthus fragrans等植物的固碳释氧能力较弱。

It is six years from the completion of the Grand Canal in Yangzhou City. How about its ecological effects？ Carbon fixation and oxygen release of landscaping plants along the Grand Canal were studied from June to August of 2006, and 19 typic plant species were chosen to determine with the aid of the LI-6400 portable photosynthesis system. The results showed that the 19 species were cIassified into three types according to their daily ability to fix carbon and release oxygen per unit area： those higher than 65 g·m^-2·d^-1 including Ligustrum quihoui, Robinia pseudoacacia and Salix babylon＆a; those between 26 g·m^-2·d^-1 and 58 g·m^-2·d^-1 including Cinnamomum camphora , Citrus mediea , Eriobotrya japonica, Ligustrum lucidum , Magnolia grandiflora , Viburnum awabuki , Ginkgo biloba , Prunus eerasifera , Sophora japonica, Amygdalus persiea , Magnolia denudata , Nerium indieum , Forsythia viridissima, Jasminum nudiforum and Chimonanthus praeeox ; and those lower than 8 g·m^-2·d^-1, only Osmanthusfragnans. L. quihoui had highest daily ability to fix carbon （115.021 1 g·m^-2·d^-1） and release oxygen （83. 638 0 g·m^-2·d^-1） . S. babyloniea and A. persiea, which are main species along the canal, have high ability to fix carbon and release oxygen, so it shows that the planting arrangement of the canal is ideal. [ Ch, 1 fig. 4tab. 9ref.]