Differential Analysis of Response to Aluminum Acid Atress of Four Native Tree Species Seedlings
[Objective]Acid aluminum toxicity is a common productive problem in plantation cultivation in southern China.This study aimed to explore the resistance difference of native tree species to acid and aluminum stress,and provide reference for efficient cultivation of plantations.[Method]In this experiment,four main native afforestation tree species in southern China,such as Castanopsis hystrix,Schima superba,Cinnamomum camphora and Michelia macclurei,were used as the research objects.Under the condition of artificial control environment,the changes of seedling growth physiology of each tree species under different acid aluminum treatments were explored by hydroponic method.[Result]The results showed that under the treatment of pH 5.0 and no aluminum addition,the seedlings of the tested tree species suffered from acid stress,the survival rate of the seedlings decreased,the chlorophyll content,net photosynthetic rate(Pn),water use efficiency(WUE)and stomatal conductance(Gs)decreased,the transpiration rate(Tr)and malondialdehyde(MDA)content increased,and the activities of POD and SOD increased.Under the combined stress of pH 5.0+0.5～1.5 mmol·L-1 aluminum sulfate,with the increase of aluminum addition concentration,the survival rate of seedlings decreased,chlorophyll content,Pn,WUE and Ci decreased,MDA content increased,Gs decreased first and then increased,and POD and SOD activity increased first and then decreased.Through principal component analysis and evaluation,under the acid stress without aluminum addition,the resistance of Schima superba was the strongest,followed by Michelia macclurei,Cinnamomum camphora and Castanopsis hystrix.Under the combined stress of acid and aluminum,the resistance of the four tree species tested was as follows:Michelia macclurei＞Schima superba＞Castanopsis hystrix＞Cinnamomum camphora.[Conclusion]The study suggests that compared with Cinnamomum camphora and Castanopsis hystrix,Michelia macclurei and Schima superba have stronger resistance to acid and aluminum toxicity.
native tree speciesresistance selectionaluminum and acid toxicityprincipal component analysissuitable tree for site
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