| Based on the GIS technology,City-green computer model was used in this paper to estimate ecological benefits of urban forest in three cities,Hefei,BengBu Maanshan in Anhui province.It used this technology to make an analysis on urban forest ecological benefits for different cities in this country.On the one hand,Author discussed how to use the technology of CITY-green model developed in USA to account urban forest benefits in this country.On the other hand,the results produced in the paper will provide a reference and guidance for construction theory and management practice of urban forests in city.This paper includes three aspects:1)TM remote sensing data in three cities of Hefei,Bengbu and Maanshan has been interpreted by GIS technology,meanwhile field surveys was made to check the imaging interpretation results,and some adjustment was added if it is necessary.Based on these, the ecological benefits of urban forest,such as carbon sequestration,air clean,surface runoff reduce,was accounted using CITY-green model.The results showed that:(1) There were 6 major landscape elements including urban forest,construction and hard pavement surface,water,bare land,the general green belts and farmland.The urban forest patch occupied 8.03%of total land area in the Hefei,7.53%in Bengbu,and 16.59%in Maanshan respectively.It reflected that there are different for urban forest area in different cities in this province,and the urban forest area in the three cities increased southward,thus means that each north city has more urban forest patch area compared to the south one.The reasons could be summed up in three points,or geographical dimensions,management policy and economy situation.(2) The integrated ecological benefits of urban forest in the three Cities are as follows: Hefei reached to 569.2966 million yuan totally,Bengbu 312.3149 million yuan and Maanshan 608.0468 million yuan.According to the benefits per unit area,Hefei city reached to 58,200 yuan per hector and 57,500 yuan for Bengbu city,and 92,100 for Yuan Maanshan city.It shows that the benefits from urban forest in Maanshan is better than that of Hefei and Bengbu in both overall and units benefits.(3) Urban forest patch occupied 9.51%of land area in the inner city of firs ring road, which cover about 20km~2,and 7.67%of land area could be classified as urban forest patch in the area between first ring road and second ring road,which covers about 78 km~2. The integrated benefits of urban forest for these two parts as follows:the former reached to 133.4049 million yuan,the latter is 435.8919million yuan.According to the benefits per unit area,69,900 yuan per hector for the former and 55,400 yuan per hector for the latter.It shows that the inner city is better than that area between the first ring road and the second ring road in the overall and unit benefits.2) Three city parks,such as XiaoyaoJin Park,XingHua Park in Hefei and Yushanhu Park in Maanshan City,was selected for being analyzed using CITY-green.Benefits from woodlands of these park was accounted and,and the results showed that:(1) Woodland patches in Yushanhu park occupied about 44.02%of park land area, XiaoyaoJin Park 52.62%,and XiaoyaoJin Park 13.00%respectively,This indicated that there are more big trees and higher canopy coverage in both parks of Yushanhu and XiaoyaoJin which was built in 1950's to 1960's,but larger area lawn becomes major landscape,while low canopy coverage was in XingHua Park built in 1990's.(2) According to integrated benefits of woodlands,Yushanhu Park reached to 26.1017 million yuan and was listed at top,then XiaoyaoJin Park 5.1503 million yuan and Xinghua Park 1.3543 million yuan in order.If it was listed in accordance with benefits per unit land area,Yushanhu Park was at the top with its benefits of 186,900 yuan per hector,XiaoyaoJin Park 144,000 yuan per hector and Xinghua Park 47,460 yuan.It shows that the Yushanhu Park has the highest ecological benefits compared with other two city parks.3) Landscape pattern of the old campus of Anhui Agricultural University covered about hectors was analyzed in the paper,meanwhile ecological benefits of trees at the campus was estimated as well using City-green model.The results as the follows:Tree canopy cover at the campus is up to 303750 m~2,which occupied 45%of total land area,the ecological benefits from trees could reach to 5.4828 million yuan.Through the analysis of different regions selected from campus,the different regions,such as education square,residential neighborhood,sport field,recreation area,have different ecological benefits due to different planting patterns,stand density,tree age and growth conditions.Therefore,the authors suggest that the campus should establish a systematical management system for tree maintain.It is necessary to take considerations to preserve both of extant big trees and green lands when make constructions at the campus.
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