Status Analysis And Comprehensive Evaluation Of Color-leafed Tree Species Germplasm Resources In Guangwu Mountain

As an important component of forest resources,forest germplasm resource is the cornerstone of socialist ecological civilization construction of China and the important strategic resources,it is important for forestry construction and sustainable development..Guangwu Mountain located in the Daba Mountain System.The regional unique climatic characteristics produced large-scale color-leafed landscape,which promoted the regional tourism industry construction greatly.Color-leafed tree species germplasm resources not only has edible value,medicinal value and material value,but also unique ornamental value,and the development potential is incalculable.The investigation and collection of color-leafed tree germplasm resources is the basis that transport the development potential value to quality seedling provenance forestry engineering projects needed.However,it lacks related research still.Therefore,color-leafed tree species in the study area of Guangwu Mountain were selected as research object.The line transect survey method was adopted to investigate during October to November 2018.And a supplementary survey was conducted during October to November 2019.A total of 20 transect survey lines were investigated,with a total length of 48.7km.Based on the survey results,color-leafed tree germplasm resources status was analyzed,and the comprehensive evaluation and grading analysis of mainly color-leafed tree germplasm resources in Guangwu Mountain was carried out by establishing the comprehensive evaluation model.Based on the status analysis and comprehensive evaluation results of color-leafed tree germplasm resources in Guangwu Mountain,suggestions were proposed for its protection and utilization.The main results are as follows:（1）The germplasm resource of color-leafed tree species in Guangwu Mountain was abundant with 46 families,90 genera and 151 species.The families,genera and species quantity of angiosperms was 43,88 and 147,respectively,while that of gymnosperm was only 3,3,and 4,respectively.40 families,78 genera and 131 species was wild distribution,17 families,22 genera and 27 species was cultivated color-leafed tree species,7 species was both wild and cultivated tree species.The species quantity of arbor,shrubs and vines are 82,60 and 9,respectively,and that of yellow-colored,red-colored colored,and multi-colored leaf trees was 94,35 and 22,respectively.There were 2Ⅰgrade conservation species,6 II grade conservation species and 5 endangered tree species of color-leafed tree species.The resources quantity of edible class,medicinal class and material class color-leafed tree species is 8,6 and 5,respectively.（2）The wild woody plant genus of color-leafed tree species in Guangwu Mountain can be divided into 11 positive types and 2 variants,and the distribution type dominated by temperate was most distributed,with a total of 62 genera and 103 species.The type of mainly tropical distributions occupied a certain proportion in the survey area,with a total of 14 genera and 20 species.The world widely distribution distribution was less,with 2genera and 8 species.The color-leafed tree species flora in this area had the characteristics of temperate zone and certain transition zone.（3）15 major color-leafed tree species in Guangwu Mountain was evaluated and graded by the AHP model of color-leafed tree species according to the analytic hierarchy process.The Results showed that leaf color（P₁）and ornamental period（P₄）were the most important for the comprehensive evaluation of color-leafed tree species.The comprehensive evaluation forⅠgrade（M≥80%）of color-leafed tree species was only one,which was Acer griseum.There are 10Ⅱgrade（60%≤M≤79%）and 4Ⅲgrade（M≤59%）color-leafed tree species.（4）According to the comprehensive evaluation results,the quantity of orrnamental value wild color-leafed tree species was 9,which are potential for development and utilization.It can build tourist loops,bridge landscapes and create local special attractions in the areas where these tree species resources concentrated.And these species resources with great fertility traits should also be choosed to developed as new local color-leafed tree species with independent intellectual property rights.According to the analysis results of resources current status,it can be concluded that there are 19 other valuable wild-color-leafed tree species with development and utilization potential.These tree species could be developed by modern biotechnology and establishing the introduction and domestication base of germplasm resources to provide high-quality seedlings for forestry engineering projects such as the forest quality precision improvement plan.Guangwu Mountain is rich in color-leafed tree species resource.Many unexploited wild color-leafed tree species and highly ornamental and potential value species were exsited in the area.The color-leafed tree species,such as Acer griseum,were found greatly ornamental value and practical application by constructing the evaluation model.These results can provide data support for the conservation and collection of color-leafed tree species germplasm resources and sustainable forestry development.It also provide scientific basis for the development and utilization of color-leafed tree species.