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随着全球城市化的加剧,城市作为一个受强人类活动支配的生态系统,在显著改变土地利用的同时,也改变了城市内植被的碳吸收和碳储存能力。本文选取杭州具有代表性的2个树种香樟(Cinnamomum camphora)和悬铃木(Platanus acerifolia)为研究对象,调查并测量了720株树木的胸径、株高、株距和冠幅,测量了230株样木近10年的平均轮面积增量,对城市不同土地利用类型上不同树种的碳储存和碳吸收速率进行了估算和比较。结果表明,香樟碳储存为45kg C·m-2,悬铃木104kg C·m-2。香樟碳吸收速率在政府机关用地上最大,住宅区最小;而悬铃木在住宅区碳吸收速率远远大于商业区和政府机构用地。冠幅是影响香樟碳吸收速率的主要影响因子,而悬铃木的碳吸收速率与冠幅相关外还受到年龄的影响。在城市土地利用类型中乔木碳吸收是野外相同年龄乔木的5倍甚至更多。
As global urbanization intensifies, cities, as an ecosystem dominated by strong human activities, have dramatically changed land use while also changing the carbon absorption and carbon storage capacity of urban vegetation. In this paper, two representative tree species, Cinnamomum camphora and Platanus acerifolia, were selected as the research object. The DBH, plant height, spacing and crown width of 720 trees were surveyed and measured. The average annual increase in area over the past 10 years estimated and compared the carbon storage and carbon uptake rates of different tree species in different land use types in cities. The results showed that C. camphora was 45kg C · m-2 and 104kg C · m-2. Camphor carbon absorption rate in the government agencies the largest land, the smallest residential area; and Platanus carbon absorption rate in residential areas is far greater than the commercial area and government agencies. Crown width is the main factor affecting the rate of carbon absorption of camphor, while the carbon absorption rate of Platycladus orientalis is also affected by the age in addition to the crown width. In urban land use types, tree carbon uptake is 5 times or more than trees of the same age in the wild.