三个乡土树种对Cu、Pb胁迫的生理生态响应

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Abstract

Three native tree species Cinnamomum camphora,Gordonia axillaris and Syzygium hance were selected and sprayed with cuprum(Cu) and plumbum(Pb) solutions of different concentrations to examine their physio-ecological response to Cu and Pb stress.The concentrations for Cu were 0 mg·L^-1,50 mg·L^-1,150 mg·L^-1 and 250 mg·L^-1;while the concentrations for Pb were 0 mg·L^-1,10 mg·L^-1,20 mg·L^-1 and 30 mg·L^-1.At the end of cultivation period,some parameters including tree height, biomass of roots,stems,and leaves as well as total biomass were measured;besides,biological membrane permeability and SOD activities of leaves were surveyed.The results are as follows.(1) The inhibition of growth of three native tree species becomes much more significant as the concentrations of solutions increase.S.hancei grows the best as compared to other species.(2) The biological membrane permeability of tree leaves is increased with the increasing of solution concentrations,indicating the damage caused by the Cu and Pb becomes more serious with the increasing of solution concentrations.When Cu concentrations is 250 mg·L^-1,the leaf membrane of C.camphora is damaged the most as compared with other tree species,while the leaf membrane of G.axillaris is damaged the most at 30 mg·L^-1 Pb.(3) Under Cu stress,SOD activity of leaves is rised at first then decreased as the concentration increases except for G.axillaris,SOD activity of which is increased with the increasing of Cu concentrations.(4) Under Pb stress,as the concentration rises,SOD activity of leaves is declined with the exception of S.hancei, leaf SOD activity of which appears to increase in the end of experiment.

Key words： cuprum(Cu) and plumbum(Pb) stress biomass membrane permeability SOD activity native tree species

Received: 25 August 2009

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	Articles by authors
	YANG Song
	WANG Zhi-xiang
	ZHOU Guang-yi

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YANG Song,WANG Zhi-xiang,ZHOU Guang-yi. Physio-ecological response of three native tree species to cuprum and plumbum stress[J]. , 2009, 28(4): 305-310.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2009/V28/I4/305

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