The Building Of Urban Forest Ecosphere In Xiang-tan City

Forest is the result of the global evolvement and become the main body of the ecosystem on the surface of the earth.The forest development was inrupted and damaged due to the emergency and population explosion of the mankind,especially in the urban areas,where the ecosystem banlance is seriously encounting threat now.The building of urban forest ecosphere is becoming focus worldwidely as well as the recognition of the founction of the forest.1,The definition of the urban forest ecoshpher was given here:the matteral circulatition,energy flow and message transmition safe ecosystem of biocenosis(dominented by human and forest) and environmental factors both in the urban and sub-urban areas.2,Focus on the urban forest environmental factors in the ecosphere,the natural and social conditions,the urban forest lands,stands,forst stand species,and afforestation species were investigated and studied in Xiangtan city,Hunan province,China.The situation of the urban forest was point out and also the problems and shortcoming were found out here.3,The mesurations were carried out on the urban environmental factors such as river water,air, sound and solid waste and the current data were got as well as the environmental problems were pointed out in Xiangtan city.4,The quantification treatment analysis was taken on the 9 indexs(cold resistance ablity,drought resistance ablity,disease and ped rsistance ablity,pollution resistance ability,dust absorption ablity, oxygen release ablity,growth potential,ornamentation performance and maintain complexion) of the 53 current application tree species,the classification was drived out and the integrated evaluations were given respectively.5,The building of the urban forest ecosystem in Xiangtan city includes three sections:2) The surrounding wide forest bults and green land.Including the ecological public welfare forest,non-timber forest,forest park,rural residential area forest and field protected forest. 2) The forest bults of roads and rivers.3) Green island and green center.Include forest park in the city,the inductrial green land,the forest landscaping of urban residential area,the afforestation for the school or university,and so on.All of the above sections contribute together for the huge arboreous green ecosystem,and the future bulted forest landscape ecosphere will demonstrated by the emerged green hills,forest lands, green islands and the clear waters.6,Based on the theories of silvicuture and ecological landscape science the specific arboreous building technologies had been discussed detailedly and respectively on all the urban forest ecosphere sections.