Research Of The Evaluation And Optimization Of Camellia Oleifera Agroforestry Management Modes Of Yunxigu,Changde

Camellia oleifera,known as one of the world’s four major woody vegetable oils,is a unique economic tree species with bigh cultivation value in China.However,due to the low economic benefits in the early planting stage and the low popularity of its cultivation and pressing technology,many frmers are unwilling to plant Camellia oleifera,and its total supply is not high.The economic benefits in the early planting stage can be improved by interplanting other cash crops under the Camellia oleifera forest.However,it is a practical problem for formers,enterprises and the government to choose a suitable management mode.With the agroforestry management mode of Camellia oleifera in Changde Yunxigu as the object of research,this paper conducts an evaluation on Camellia oleifera planting using the corrprehensive benefit evaluation method and the emergy analysis method,It provides the theoretical basis for the choice of the compound management mode of camellia oleifera forest,proposes an optimization plan based on the status quo and evaluation results of the agroforestry management mode of Camellia oleifera in Changde Yunxigu,and draws the following conclusions.On this basis,the economic benefit,social benefit and ecological benefit are evaluated:(1)Guided by the principle of representativeness and systematicness,three criteria layers,including economic benefit,social benefit and ecological benefit,and ten index factors,including inqut-output ratio,financial net present value,internal rate of return,investment payback period,social employment value,commodity value,carbon fixation and oxygen release,water conservation,soil and fertilizer preservation as well as atmospheric purification,are chosen to establish a comprehensive benefit evaluation index system for Camellia oleifera planting in Changde Yunxigu:1)In terms of economic benefits,the economic benefit index factors of each Camellia oleifera agroforestry management mode are ranked as follows:Camellia oleifera + Gardenia Jasminoides Eill agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry management mode>Camellia oleifera +Anthemideae agroforestry management mode>Camellia oleifera pure management mode.2)In terms of social benefits,the social benefit index factors of each Camellia oleifera agroforestry management mode are ranked as follows:Camellia oleifera +Anthemideae agroforestry management mode>Camellia oleifera + Gardenia Jasminoides Eill agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry management mode>Camellia oleifera pure management mode.3)In terms of ecological benefits,the ecological benefit factors of each Camellia oleifera agroforestry management mode are ranked as follows:Camellia oleifera pure management mode = Camellia oleifera + Gardenia Jasminoides Eill agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry:management mode>Camellia oleifera +Anthemideae agroforestry management mode.4)The comprehensive benefits of each Camellia oleifera mangement mode are ranked as follows:Camellia oleifera + Gardenia Jasminoies Eill agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry management mode>Camellia oleifera + Anthemideae agroforestry management mode>Camellia oleifera pure management mode.(2)Based on literature research and actual situation,energy investment rate,energy output rate,environmental load rate,energy sustainability index,renewable resource energy ratio and energy density per unit area are selected as energy analysis index,According to the results of emergy analysis,the energy,value investment rate of each management mode is ranked as follows:Camellia oleifera + Anthemideae agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry management mode>Camellia oleifera + Gardenia Jasminoides Eill agroforestry management mode>Camellia oleifera pure management mode.The energy value output rate of each management mode is ranked as follows:Camelia oleifera +Gardenia Jasminoies Eill agroforestry management mode>Camellia oleifera pure management mode>Camellia oleifera + Anthemideae agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry management mode.The environmentall load rate of each management mode is ranked as follows:Camellia oleifera pure management mode>Camellia oleifera + Anthemideae agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry management mode>Camellia oleifera+Gardenia Jasminoides Eill agroforestry management mode.The energy value sustainability of each management mode is ranked as follows:Camellia oleifera+Gardenia Jasminoides Eill agroforestry management mode>Camellia oleifera pure management mode>Camellia oleifera + Oryzasativa agroforestry management mode>Camellia oleifera + Anthemideae agroforesty management mode.The renewable resource energy ratio of each management mode is ranked as follows:Camellia oleifera+ Gardenia Jasminoides Eill agroforestry management mode>Camellia oleifera +Oryzasativa agroforestry management mode>Camellia oleifera pure management mode>Camellia oleifera + Anthemideae agroforestry management mode.The Energy density per unit area of each management mode is ranked as follows:Camelia oleifera+ Anthemideae agroforestry management mode>Camellia oleifera + Oryzasativa agroforestry management mode>Camellia oleifera pure management mode>Camellia oleifera +Gardenia Jasminoides Eill agroforestry management mode.(3)The existing problems are analyzed based on the results of comprehensive benefit analysis and emergy analysis,and the optimization plan is put forward according to the actual situation.