| The city’s green spaces play very important ecological role in improving the urban ecological environment, participating in cities’ material and energy recycling and updating. Green infrastructure using external land conservation and other open space network identification, protection and long-term management approach for the protection of urban green space protection measures proposed strategic. This paper introduces the concept of green infrastructure, extracting of regional vegetation by using of remote sensing information, and identifying green infrastructure in Wuhan, extracting green infrastructure connecting corridor, estimating its three-dimensional Living Vegetation Volume (LVV), analysis of the overall three-dimensional LVV distribution, connecting corridor network distribution and their three-dimensional LVV distribution characteristics. The main contents and conclusions are as follows:(1)By regression analysis of actually measured LAI values of plant communities in the survey quadrats and the extracted vegetation index extracted by ETM remote sensing image, get the best fit of regression equation model between LAI and RVI which has a better fitting degree with LAI, y=-0.508+2.061x-0.207x2+0.012x3 (R2=0.726)(2) Overall area of study area is about, total LVV, LAI of the green covering areas, the green value of per unit area in the study area are respectively 8588.3km2,211.85 X 108m2,3.547 and 2.467. Where farmland area of study area is 4205.937km2, while other green coverage area including mountains and hills, total water area, and urban construction land area are respectively 1766.94km2,1583.06km2,1032.43km2, the farmland occupies the most green coverage area in the study area. The grade distribution of LVV in the study area is dominated by low level LVV area, the whole area’s level of LVV is low.(3) The green corridor area of green infrastructure is 35.89×108m2 in the study area, and the LVV is amounted to 130.64×108m2, mean LAI 3.641. From the analysis of the LVV features of different components in the connecting green corridor, we get that the hills’LAI> Mountain’s LAI> Urban Green space’s LAI> Farmland’s LAI> Fluctuating Zone’s LAI. And the farmland is the largest in all the green space types, and the mountain is the second, followed by green space of the city, hills and fluctuating zone.(4) After comparing LW’s grade feature of different component types, and different levels of various types of LW areas and the ratio of their area and values, we can get that hills and mountains are in highest LW level, while the LW of farmland and fluctuating zone are lower, and the LW of urban green space is the lowest within all the five types of green space.(5) Extract typical corridor 20 and analysis LAI average, maximum, minimum in every corridor, as well as LAI averageã€green area and LW in different levels of LW of every corridor. The LAI average is higher of three corridors, which are No.1DongHu-SheShan corridor, No.2FuHe river corridor, and No.9 QingLong Moutain-BaiYunDong hilly corridor, while the LVV of them are also higher than other corridors.(6) Different spheres of analysis showed that urban green infrastructure connecting corridor distribution and growth of urban construction land showing the opposite association, area of urban green corridor within the 3rd line accounts for 1.16% percent of the metropolitan corridor area, and the 3rd line to the outer line corridor area 15.47%, the outer line to the City 83.37%. Different spheres increased by leaps and bounds, from the outer to the inner, strength increases with the urban construction, the Green Corridor area and LW sharply reduced.(7) According to LVV’s distribution and the problems of the green infrastructure connecting corridor in the study area, this paper proposes some strategies of the whole LW pattern. And this paper also proposes a better model of LW structure, according to the three development areas which contain the main city, the area within the 3rd line to the outer line and the suburb of Wuhan city. |
