关键词: 景观格局, 植被变化, 三工河流域

Abstract: With the ever more rapid urbanization around the world, cities, as an ecological system greatly dominated by human activities, have had great changes in their land use, and also, in the vegetations carbon sequestration. In this study, Cinnamomum camphora and Platanus aceriforia, the two representative tree species in Hangzhou area, were chosen to determine their carbon storage and carbon sequestration in different types of land use in Hangzhou. The tree DBH (diameter at breast height), height, planting distance, and crown area of 720 individuals were measured, and the mean annual increment of the tree ring area of 230 individuals in recent 10 years was calculated. Then, the carbon storage and carbon sequestration rate of C. camphora and P. aceriforia in different land-use types in Hangzhou City were estimated and compared. It was estimated that the carbon storage of C. camphora and P. aceriforia was 45 kg C·m^-2 and 104 kg C·m^-2, respectively. The carbon sequestration rate of C. camphora was the highest in government agencies sites and the lowest in residential sites, whereas that of P. acerifolia was far greater in residential sites than in commercial and government agencies sites.For C. camphora, crown area was the main factor affecting the carbon sequestration rate; for P. acerifolia, both the crown area and the tree age were important. The carbon sequestration of the trees within Hangzhou was 5-fold or more of the equivalent age trees out of the city.

Key words: Landscape pattern, Vegetation dynamics, Sangong River Basin