基于QuickBird和CITYgreen的沈阳城市森林效益评价

Ecological benefit evaluation of urban forests in Shenyang City based on QuickBird image and CITYgreen model

利用2006年沈阳QuickBird遥感影像解译数据,以CITYgreen模型为基础,采取抽样技术,研究了沈阳市不同类型各郁闭度等级城市森林的固碳和污染物净化效益.结果表明:沈阳城区总碳储量0.51Tg,价值1.26亿元;年固碳率6858.20Mg,价值172.41万元;年净化污染物556.04Mg,价值0.22亿元.其中生态公益林固碳和净化效益的贡献率最高,碳密度由大到小依次为附属林、风景游憩林、生产经营林、生态公益林和道路林;固碳率由大到小依次为生产经营林、风景游憩林、生态公益林、附属林和道路林;净化污染物能力由大到小依次为生产经营林、风景游憩林、附属林、生态公益林和道路林.不同城市森林类型的碳密度与其结构密切相关,高郁闭度下固碳和污染物净化能力皆高,低郁闭度下固碳和污染物净化能力取决于其结构的复杂程度.

Based on the urban forest coverage data interpreted from QuickBird image （2006） and the CITYgreen model, the benefits of Shenyang urban forest types with different canopy closure in carbon fixation and pollutant removal were investigated by means of sampling strategy. The results showed that the total amount of carbon storage, annual carbon sequestration, annual air pollutant removal, and their corresponding values were 0. 51 Tg, 6858.20 Mg·a^-1 556. 04 Mg·a^-1 1.26×10^8 Yuan, 1.72× 10^6 Yuan, and 0.22×10^8 Yuan, respectively. Among the urban forest types in Shenyang City, ecological and public welfare forest （E） contributed most to the carbon fixation and air pollutant removal. The carbon density decreased in the order of S （subordinated forest） 〉 L （ landscape and relaxation forest） 〉 P （ production and management forest） 〉 E 〉 R （ road forest）, annual carbon sequestration was in the order of P 〉 L 〉 E 〉 S 〉 R, and annual air pollutant removal was in the order of P 〉 L 〉 S 〉 E 〉 R. The carbon density of different urban forest types was closely related to their structural complexity. For the forests with high canopy closure, both the annual carbon sequestration and the annual pollutant removal were high; while for those with lower canopy closure, these two characteristics were dependent on the structural complexity of the forests.