Study On Vegetation Quantity Of East-West Massif Corridor Area In Wuhan

As the issue of urban environment is increasingly conspicuous, urban environmental problems have become increasingly prominent, the level of urban greening is considered as an essential factor which influences the sustainable development of a city, reflecting in the quantity and spatial layout of greening. In comparison with the traditional Two-Dimension greening index, Living Vegetation Volume can exactly reflect the rationality of urban green structure and the level of ecological benefits. As the backbone of urban green space, east-west massif corridor area in wuhan undertakes great task on improving city ecological environment, therefore, it has significant importance in taking advantage of the ecological benefits of mountain and corridor area and improving the urban ecological environment to study the green structure of urban mountain corridor area from the angle of Living Vegetation Volume.In this paper, with the support of the National Natural Science Fund Project "Study on Structure of Urban LVV Based on Leaf Area Index Inversion" (Grant No.:30972413), firstly, based on leaf area index and considering various community structure as basic research units, this studies carry out actual measurement on vegetation quantity of garden green space in Wuhan city,which helps establishing related equations on the basis of measured data and vegetation index extracting from remote sensing information, then make leaf area index(LLI) inversion and generate LLI distribution pattern with using the most fitting correlation equation selecting from above equations, finally, on the basis of analytical results from further analyzing and evaluating the vegetation quantity features in massif and corridor area in question with the help of previous LLI distribution pattern, optimization strategies on vegetation quantity distribution in corridor area are put forward.The main findings are as follows:(1) The cluster analysis results of LAI values of various community structures are: multi-layer, three-natural-arbor and shrub, double-natural-arbor combined into natural-similar community structure; three-artificial arbor, double-artificial-arbor, double- arbor and shrub, double-shrub, single-arbor and single shrub merged into artificial community structure; grassland community structure as a separate category;(2) Overall inversion of sample community is fitter than Category inversion, the correlation between LAI and RVI from actual measurement of sample community structure is fitter than that between NDVI and MSAVI, the best fitting one of all the equations is the S-shaped curve equation:y=e 2.8347-2.0832/x(R2=0.729, accuracy testing R=0.809);(3) Comparative analysis results of massif vegetation quantity features (listing from high to low):Maximum Value of LAI:the highest one is Luojia Mountain,the next to it is Mo Mountain, Fengmeng Mountain is the lowest one; Mean Value of LAI:the first is Bijia Mountain, the second is Taiyu Mountain, the last is Gui Mountain; Sum total of LAI: Ma’an Mountain’s is the highest, then the Mo Mountain, the lowest is Zhangjia Mountain;(4) Comparative analysis results of vegetation quantity features of massifs which are used for different purposes:Park catalogue< Campus catalogue< Landscape catalogue (Minimum Value and Mean Value of LAI)(5) Analysis results of vegetation quantity features of corridor area:hard patch’s PLAND, LPI and COHESION are all the highest; PD and AI of water patch are the highest, while NP, PD, LSI and PAFRAC of it are the lowest; in comparison with the middle and low vegetation quantity, PLAND, Area MN,LPI,AI and COHESION of high vegetation quantity patch are higher, while its PD, LSI and PAFRAC are lower; each structure index of middle vegetation quantity patch is in the intermediate status; PD, LSI and PAFRAC of low vegetation quantity patch are high while PLAND, Area MN, LPI, AI and COHESION of it are low;(6) On the basis of analyzing the vegetation quantity features in research area, put forward optimization strategies on vegetation quantity distribution in corridor area, strengthen the protection and restoration of massif vegetation quantity, improve the vegetation quantity level and continuity of roads and waterfront green lanes, increase the amount and scale of green patch in green space, and improve vegetation quantity level and connectivity between patches in affiliated green space of parks and departments.