| The Pinghu city with water nets in northern Zhejiang plains was selected,based on systematic summary for ecological,landscape,economic roles of rural greening,and the growth history of rural greening in domestic and overseas.Systematic investigation and analysis of trees and configuration for rural greening was conducted in Pinghu land region,thus the problems during the rural greening were summarized.By through the comprehensive evaluation for the experimental result of importing precious color-leaved trees,in combining with the environmental characteristics of water nets in plains,and five types of rural-greening demands,resulting in the tree species selection,configuration and practical measures for rural greening,which will provide the tree species and technique of rural greening and beautification in Pinghu and similar regions.These results as following:(1)After survey of the resources,growth types,ecological adaption and insect pests of greening trees in Pinghu land regions,we found the number of tree species for rural greening was limited,exemplified by the whole city land region only contains 27 families,51 genus,and 73 species,including 1 8 kinds of ever-green trees,31 kinds of deciduous trees,1 1 kinds of deciduous small trees,and 13 kinds of deciduous shrubs.We also found 15 tree species were the most common,including Ginkgo biloba,Zelkova schneideriana and Cinnamomumcamphora,while only contained four shrubs,including Photinia fraseri,Loropetalumchinense,Prunus cerasifera,and Pittosporum tobira.Furthermore,these trees were usually showing single color,and simple configuration,as well as some trees failed to grow well because of unsuitable environment or improper maintainance method,leading to relative low greening effect.(2)A total of 50ancient and famous trees were found in Pinghu city,based on the systematic survey of resources for ancient and famous Trees in the whole land regions of Pinghu city.These ancient and famous trees contained 12 species,including G.biloba,C.camphora,Z.schneiderianaandCamellia japonica,of which G.biloba and C.camphora were the most common,accounting for 46%,and six the first-or second-grade trees were G.biloba.Theancient and famous trees were protected well now,while the rescue technique,and management funds should be strengthen,with the aim to protect this class of ancient and famous trees.(3)Based on the improvement experiment of precious color-leaved trees grown in cityroad,countrygreening,farmland shelterbelts,the results showed that except of indigenous trees including G.biloba,C.camphora,Z.schneiderianaandCeltis sinensis,other colorful trees and shrubs Koelreuteriabipinnata,Liquidambar formosana,Sapindusmukorossi,Rhododendron simsii,andArmeniacamume,and other precious including Phoebe chekiangensis,Cinnamomum chekiangense,and Ormosiahosieiwere grown well in city road,country greening,farmland shelterbelts,as well as the rate of transplanting and preservation reached to 100%.Besides,new cultivar for dry and fruit trees of Carya illinoinensis,Citrus reticulata,Eriobotrya japonica,andCitrusmaximawere suitable for country greening,which was popular for residents.pinuselliottii,Taxodiomerapeizhongii,and Taxodium’Zhongshansha’were suitable forshelterbelts of farmland and coast.(4)Considering five types of rural-greening and environmental characteristics,51 kinds of tree species were selected for city road,country greening,and country landscape,of which 31 kinds of species were strongly recommended;35 kinds of shrubs were selected,and 19 shrub species were strongly recommended;seven kinds of vines were selected,and four species were strongly recommended.In respect of orshelterbelts of farmland and coast,22 kinds of tree species were selected,and 16 species were strongly recommended;13 kinds of shrubs were selected,and nine were strongly recommended,as well as the species configuration and management measures were proposed. |
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