Multiobjective Selection Of Fire-resistant Tree Species In Different Site Condition In Shitai County

Based on the field determination and data analysis,by the methods of successive regression and principal component analysis,fire-resisting properties of 30 species of trees in Shitai county of Anhui Province has been evaluated effectively and comprehensively,the results indicate that the fire-resistant ability varies among different species of trees.Form the comprehensive evaluation,these species would be classified into four classes,according to their fire-resisting properties.The Class ? includes Camellia oleifer?Schima superba?Ccmellia sinensis,lLithocarpus glaber?Cyclobalanopsis glauca C.sclerophylla?C.eyrei?Lithocarpus Harland?Quercus variabilis Bl.?Quercus acutissima carr.?Castanea seguinii Dode.These plants are the prior fire-resistant species in the Shitai County,which have scored above 0.9 on the comprehensive properties,including the combustion,forest land combustible situation,fire-resistance,sprouting ability and economic value.Among them,Schima superb can resist the fire strongly,bear the barren and arid land,prefer fertile and acid sandy soil in Shitai County,distributed from low altitude to high altitude on mountains,which can be used as high-qualified wood,so it's preferred as the first fire-resistant tree species on the From-middle-to-low mountains in the central area of Shitai county.Camellia oleifera can grow on acid,barren and arid land,and the seed produces oil which could be used in the fields of food and industry,therefore it has large demand in domestic and international markets.As fire-resistant tree species,Camellia oleifera is not only fire-proof,but also improving ecological environment and bringing on economic benefits.There is no doubt that it is the main fire-resisting tree in the northern mountain area of Shitai county.Cyclobalanopsis glauca,Lithocarpus glaber,Castanopsis sclerophylla are common and widely distributed in mountainous area of Shitai County,these evergreen broad-leaved species have strong fire-resistance performance,vigorously protected in recent years,which prefer moist soil,especially grow well in the fertile land.Light-like Sakaguri Kiko can adapt barren and arid soil environment,widely distributed in western low mountain and hilly area of Shitai,such as the town of Xiaohe and Dingxiang.it‘s often intercropped with Camellia oleifer,bringing on good economic benefits.The Class ? contains Ternstroemia gymnanthera,coral tree,Ligustrum lucidum,Daphniphyllum macropodum,Sapium sebiferum,Magnolia,Camptotheca acuminata,Liquidambar,osmanthus.These secondary fire-resistant tree species have scored between 0.8 and 0.9 on the comprehensive properties.The coral tree,also known as France holly,likes to grow in the moisture and fertile soil,that pH is 5 to 7,commonly used in garden as the hedgerow,therefore it is suitable to be cultivated in scenic spot,forest park,such as Guniu Jiang,Mulian Mountain,playing the role of fire barrier in forest and landscaping at the same time.The Privet is not only fire-resistant,but also evergreen and ornamental,suitable for planting in western low mountain areas of Shitai County,such as the town of Xiaohe and Dingxiang.Daphniphyllum macropodum Miq.belongs to shadow plants,prefers moisture and fertile soil,adapts high altitude climate,which is in beautiful shape.It is suitable to be cultivated in the scenic area,such as the Guniu Jiang area.So is Ternstroemia gymnanthera.Osmanthus like light,warm climate and moisture sandy soil in good drainage.In recent years,its landscape value is appealing,suitable on the low mountains in the eastern and central area of Shitai County.The Class ? are camphor,banana shrub,bamboo,these species have lower evaluation scores,which are 0.6732,0.7325,0.6858 respectively,so they are not suitable as fire-resistant tree species.The class ? contains Pinus massoniana,Platycladus orientalis,Liriodendron,cedar,fir,cedar,Cryptomeria fortunei,Huangshan pine,Slash pine.Fire resistance of these species is low,which can easily lead to forest fires,so they are the focus of the work of forest fire prevention.The forest made up of the plants in the class IV,should build biological isolation belts composed with the species in the class?and class?.In order to improve the fire-resistance ability,it's better to cultivate in the broad-leaved and coniferous tree mixed-mode.Based on forestry data and field investigations,according to the condition of soil,climate,topography and social-economy in the county of Shitai of Anhui province,this study classify the forest site into 4 sub-type of site condition,12 site-condition type composes and 28 site-condition types on the scientific,concise and practical principle,combined the comprehensive factors analysis with the dominant factor analysis,as well as the systematic,step-by-step coordination method.The four sub-types of sites are low mountain site-condition subtype in the eastern area,the form-middle-to-low mountain site-condition subtype in the central area,the from-middle-to-low mountain site –condition subtype in the northern area,the low mountain and hill site-condition subtype in the western area of Shitai County.According to biological,ecological characteristics and the adaptive tree principal,the fire-resistant species are chosen pertinently and effectively in those types,taking into account the function of fire-resistance and landscape,as well as the social and economic value.The study will provide the theory basis for the artificial forestation,forest management,ecological protection and the building of fire-resistant forest belt in the county of Shitai.