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 CO

2

sequestrated and O

2

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 CO

2

sequestration and O

2

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 CO

2

sequestration and O

2

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 CO

2

sequestration and O

2

release. The roadside vegetation has the maximum capacity of CO

2

sequestration and O

2

release in a unit of area. While residential and institutional vegetation have the minimum capacity of CO

2

sequestration and O

2

release.