Study On The Vegetation Structure Characteristics And The Landscape Ecological Construction Of Urban Green Space In Fuzhou City

At present,the rapid modernization of urban development has brought more and more Greenland problems,which had aroused worldwide attention.Greenland is the most important natural factor in urban,which plays an important role in improving urban ecology and maintaining ecological balance.With a certain amount and quality of the interactive various green components,Urban Greenland System have important ecological,social and economic benefits,it's the only infrastructure with life and important foundation of urban ecological environment and sustainable development.In 1992,United Nations Conference on Environment and Development adopted by the "the agenda 21",which plan to integrate the city into the urban Greenland planning system,immediately caused many countries' response because of the idea representing by the pursuit of sustainable development.By taking the urban green land of Fuzhou,the research explores field study and data collection, uses quality and quantity analysis methods and GIS techniques to illustrate the situation and the structural characteristics of urban vegetation,the situation of street trees as well as the situation of road corridors,simultaneously carries on the analysis to the green space landscape multiplicity and the patch condition.Based on this,carries on the analysis using the landscape ecology's correlation theories,proposes the Fuzhou sustainable development urban green space system's construction strategy and the protection plan of urban green land biodiversity.Main research results are as follows:The Fuzhou green space vegetation community basically can manifest the appearance landscape of South Asian tropics monsoon forest and the mid-subtropics evergreen broadleaved forest,but the vegetation structure is monotonous,the seasonal aspect change is not obvious,the biodiversity is low.The green corridor width of road green land distributes equally nearby 9m. Main commonly used afforested tree seed:Leguminosae,moraceae,anacardiaceae, magnoliaceae,palmae,lauraceae,bombacaceae,sapindaceae,oleaceae,lignum sappan family, rosaceae.The dominant tree species:Acacia confuse Merr.,Mangifera indica L.,Ficus microcarpa,Michelia alba DC.,Bomb ceiba Linn,Archontophoenix alexandrae(F.Muell) H.Wendl.et D,Dimocarpus longgana Lour.,L.lucidum,Bauhinia variegate L.Ficus macrophylla Caesalpiniaceae and so on,big task banyan tree,flame tree;This investigation altogether discovered that tree seed 108 kinds,tree some 55 kinds,the forest degree of coverage has 71.23%.In investigates in the trees,the proportion which occupies by the grown-up trees is biggest,accounts for 50.12%.And presents in the frequency and the quantity,Acacia confuse Merr arranges at the first place,the Mangifera indica L..next.Appears the frequency is bigger than 50 total has 6 kind of plants,respectively is:Acacia confuse Merr,Mangifera indica L., Ficus microcarpa,Bomb ceiba Linn,Michelia alba DC.and Archontophoenix alexandrae (F.Muell)H.Wendl.By the tree primarily,holds the absolute proportion.The Fuzhou main street trees altogether 92 kinds,belonged to 37 families and 55 genus.And tree 35 kinds,shrub 57 kinds.In investigates in the path,the Ficus microcarpa is highest in frequency distribution,achieves 62.5%.The Mangifera indica L.next best,the frequency is 55%.The rest is:Bauhinia variegata＞Ficus virens＞Cinnamomum camphoraThe Fuzhou street trees by the tree monolayer structure primarily,occupy 52%;tree and shrub double-layer structure to account for 33%,but trees brushes and grasses three structures least, mainly concentrates in the Jiangbin road,baima road and so on.Looking from the level afforestation,the Fuzhou city roads assumes the horizontal netted distribution,looked from the plant disposition,each road's afforested big difference,the city majority of roads afforested the form were still by traditional board two belt types primarily.Moreover although in the green patches aspect,the Fuzhou average per person public green area accumulates with the green areas coverage rate oneself attains a designated standard,and the standard is high,but has unreasonable distribution pattern,the green space presents point and massive distribution,the city lacks the core of urban forest and enough width to connect the green space corridor to,and the comprehensive ecological benefit is bad,and also the new old public urban Greenland.Besides the Jinan area three afforestation targets,the Cangshan area afforestation coverage fraction,the green areas coverage rate achieves the country garden city standard,the other three areas each target is somewhat low.At present the entire area altogether has green space area 3108.95 hm~2,looking from the survey result:The Jinan area is biggest (1357.06 hm~2),Cangshan area next,the smallest is the Taijiang area;and looking from various green spaces type,other green spaces,the park green space and the protection green space precedes 3,the attached green space area is smallest.And in the landscape diversity,the Taijiang area is lowest,only 0.14,this area should strengthen the urban green space construction vigorously.According to the survey result,proposed that the Fuzhou city green space ecological building's countermeasure,including:increasing the green space area;balancing green space system layout connection;advocating stereoscopic afforestation,according to function district,selecting suitable trees;strengthening the culture characteristic construction of the green space and so on.