The Research On Drought-resisitance Of Ten Species Of Evergreen Seedngs And Comprehensive Evaluation

Select ten species of evergreen seedings. Determination of dry environment on the growth of these 10 kinds of evergreen seedings in 4 physiological indexes for Drought-resistance.Finally,use the fuzzy subordinate function analysis method to give the comprehensive evaluation.The main results are follow:1.In the condition of drought stress,ten kinds of evergreen seedings leaf relative water content due to precipitation changes show the corresponding tend. Sort by tissue water content:Phoebe bournei>Cyclobalanopsis glauca>Machilus thunbergii>Machilus lichuanensis>Michelia martinii>Prunus zip penliana var.puberifolia>Phoebe chekiangensis>Castanopsis tibetana Hance>Aceraceae fabri>Fraxinus griffithii.Sort by changes in tissue water content range:Fraxinus griffithii>Aceraceae fabri>Machilus lichuanensis>Machilus thunbergi>Phoebe chekiangensis>Phoebe bournei>Cyclobalanopsis glauca>Michelia martinii> Castanopsis tibetana Hance>Prunus zip penliana var.puberifolia.2.1n the condition of drought stress,ten kinds of evergreen seedings’ chlorophyll content decreased comparatively clearly during five times determination of chlorophyll content.Sort by chlorophyll content:Castanopsis tibetana Hance> Michelia martinii>Prunus zip penliana var.puberifolia>Cyclobalanopsis glauca> Fraxinus griffithii>Phoebe chekiangensis> Phoebe bournei>Machilus lichuanensis> Machilus thunbergii>Aceraceae fabri.Sort by changes in rate of chlorophyll content:Aceraceae fabri>Machilus thunbergii>Phoebe chekiangensis>Phoebe bournei>Fraxinus griffithii>Prunus zip penliana var.puberifolia>Cyclobalanopsis glauca> Machilus lichuanensis>Castanopsis tibetana>Michelia martinii.3.In the condition of drought stress,Determination of free proline content of the ten kinds of evergreen seedings.Sort by free proline content:Machilus lichuanensis> Aceraceae fabri>Prunus Zip penliana var.puberifolia> Cyclobalanopsis glauca>Phoebe chekiangensis>Machilus thunbergii>Michelia martinii> Castanopsis tibetana Hance>Phoebe bournei>Fraxinus griffithii.Sort by changes in amplitude of free proline content:Aceraceae fabri>Machilus lichuanensis>Prunus zip penliana var.puberifolia>Cyclobalanopsis glauca>Phoebechekiangensis> Machilus thunbergii-Michelia martinii>Castanopsis tibetana Hance> Phoebe bournei>Fraxinus griffithii.4.In the condition of drought stress,sort by malondialdehyde content:Aceraceae fabri>Machilus thunbergii>Machilus lichuanensis>Cyclobalanopsis glauca>Fraxinus griffithii>Michelia martinii>Castanopsis tibetana Hance>Phoebe bournei>Phoebe chekiangensis>Prunus zip penliana var.puberifolia.Sort by malondialdehyde content changes:A ceraceae fabri>Fraxinus griffithii>Phoebe chekiangensis>Machilus lichuanensis>Michelia martinii>Cyclobalanopsis glauca>Castanopsis tibetana Hance>Machilus thunbergii>Phoebe bournei>Prunus zip penliana var.puberifolia.5.Use the gray relational grade analysis calculate the correlation of each index.Indicators corresponding to the weight is:relative water content 0.2690,water saturation deficit 0.152, the chlorophyll content0.256 8,free proline content 0.219 O,malondialdehyde content0.2552,.Selected the four drought physiological indexes on behalf of the garden trees and drought assessment requirements.6.By the principal components and the membership function analysis method,results show that the drought resistance of ten kinds of evergreen seedings from strongest to the weakest as follows:Phoebe chekiangensis>Prunus zip penliana var.puberifolia>Phoebe bournei>Michelia martinii>Castanopsis tibetana Hance>Cyclobalanopsis glauca>Machilus lichuanensis>Fraxinus griffithii> Aceraceae fabri>Machilus thunbergii.