深圳特区城市植被的固碳释氧效应

The Effect of CO_2 Sequestration and O_2 Release of Urban Vegetation in Shenzhen Special Zone

以深圳特区各种类型城市植被为研究对象,通过大尺度的样方调查,获得6种城市植被类型(郊野林、休闲绿地、道路绿地、居住区绿地、单位附属绿地和生产绿地)的植物组成比例,以占据各城市植被类型70%以上的63种优势植物作为基底数据,结合航片提取的各类型植被面积和PnET的气候模型,基于主要园林植物的光合作用参数,推算出特区各种类型城市植被月、年及单位面积固碳释氧量。结果表明,深圳特区城市植被固碳释氧效应的强度按季节排序为春季>夏季>秋季>冬季。特区6种类型城市植被类型中,位于深圳特区外围的郊野林具有最大的年固碳释氧总量,深圳的道路系统绿地有最大的单位面积固碳释氧量,居住区和单位附属绿地的固碳释氧效应位居6种类型之末位。

Based on the investigation of large scale sample plots in Shenzhen Special Zone,the plant combinations in 6 types of urban vegetation were analyzed.63 dominant plants which contributed to over 70% of the vegetation coverage in each type were selected to estimate the amount of CO2 sequestrated and O2 released by urban vegetation.With the photosynthetic parameters of parts plant species,coverage of each type of urban vegetation which were measured with the information extracted from the aerial photograph,as well as a suited climatic influence model from PnET.It is estimated that the amounts of CO2 sequestration and O2 release of these plant species monthly and annually,as well as the amount of various urban vegetation in Shenzhen Special Zone.The results show that seasonal intensity of CO2 sequestration and O2 release is Spring 〉Summer〉 Autumn〉 Winter.The natural park forest which mainly located in periphery areas of Shenzhen Special Zone have the greatest amounts of annual CO2 sequestration and O2 release.The roadside vegetation has the maximum capacity of CO2 sequestration and O2 release in a unit of area.While residential and institutional vegetation have the minimum capacity of CO2 sequestration and O2 release.