基于i-Tree模型的贵阳市行道树组成与生态服务功能研究

Compositon of Street Tree in Guiyang City and its Ecological Service Function Based on i-Tree Model

为了解贵阳市行道树的组成结构现状及其生态服务功能价值,应用i-Tree模型的Street模块对贵阳市三类城区的行道树结构和生态服务功能进行分析。结果表明:观山湖区调查街道有行道树24种,南明区和云岩区调查街道有行道树18种,花溪区调查街道有行道树17种。花溪区和老城区的行道树品种少,行道树数量比差距大,物种重要值差距大,观山湖区行道树品种较丰富,数量比差距小,物种重要值差距大。老城区街道行道树覆盖率小,花溪区和观山湖区街道行道树覆盖率大。花溪区调查街道年截留雨水35 116m^3,年能源总效益24 772美元,年空气质量总效益8 050美元,年CO_2总效益4 592美元,年储存CO_23 414 060kg;观山湖区调查街道年截留雨水144 842m^3,年能源总效益80 000美元,年空气质量总效益31 735美元,年CO_2总效益15 580美元,年储存CO_29 266 104kg;老城区调查街道年截留雨水147 550m^3,年能源总效益107 496美元,年空气质量总效益34 336美元,年CO_2总效益19 439美元,年储存CO_215 774 505kg。

In order to understand the composition and structure of the street trees in Guiyang City and the value of their ecological service functions, the Street module of the i Tree model was used to analyze the street tree structure and ecological service functions of the three types of urban areas in Guiyang City. Result shows that there are 24 kinds of street tree in the investigation street of Guanshan Lake District, 18 kinds of street tree in the investigation streets of the Nanming District and Yunyan District, and 17 kinds of street tree in the investigation street of Huaxi District. There are few varieties of street trees in Huaxi District and Old Town. The difference in the number of street trees is large, and the important value of species is large. The varietyof street tree in Guanshan Lake area is rich, the difference in quantity ratio is small, and the important value of species is large. The street coverage of street tree in the old city is small, and the street coverage of Huaxi District and Guanshan Lake District is large. The annual rainwater interception of survey Huaxi District is 35 116 m3, and the total benefit of annual energy is 24 772 US dollars; the total benefit of annual air quality is8 050 US dollars; the total benefit of annual CO2 is 4 592 US dollars; annual storage of CO2 3 414 060 kg; the annual rainwater interception for survey street in Guanshan Lake District is 144 842 m3;the total benefit of annual energy is 80 000 US dollars; the total benefit of annual air qualky is 31 785 US dollars;the total benefit of annual CO2 is 15,580 US dollars; the annual storage of CO2 is 9 266 104 kg; rainwater interceptsion of the old city survey street is 147 550 m3;thetotal benefit of annual energy is 107 496 US dollars;the total benefit of the annual air quality is 34 336 US dollars. The total benefit of annual CO2 is 19 439 US dollars, and the annual storage of CO215 774 505 kg.