佛甲草(Sedum lineare)在干旱条件下的气体交换

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Abstract

To investigate ecophysiological adaptability of roof greening plant Sedum lineare of one,four,five and six years old,relative water content(RWC),mass per unit leaf area(LMA),and diurnal variation of gas exchange parameters in leaf were measured under drought condition in Guangzhou,China.Both RWC and LMA were low,and their values were 81.79% 87.58% and 0.0590.072 kg·m^-2, respectively.S.lineare in different growth stages did not show significant change in leaf RWC and LMA(P<0.05).Gas exchange parameters including CO₂ assimilation rate(A),stomatal conductance(g_s),and transpiration(E)presented similar diurnal variation pattern in different growth stages of plant.There was also no significant variation in A,g_s and E(P<0.05)in different growth stages.A, g_s and E were significantly correlated with each other during a 24 h time-course(P<0.01).S.lineare is considered to be a facultative crassulacean acid metabolism(CAM) plant according to its characteristics of RWC and gas exchange parameters.There are similar major ecophysiological indices in 5.lineare in different growth stages.

Key words： Sedum lineare crassulacean acid metabolism(CAM) gas exchange drought

Received: 25 April 2011

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	Articles by authors
	ZENG Xiao-ping
	ZHAO Ping
	CAI Xi-an
	YU Meng-hao
	MEI Ting-ting
	ZOU Lu-liu
	ZHU Li-wei

Cite this article:

ZENG Xiao-ping,ZHAO Ping,CAI Xi-an, et al. Gas exchange of Sedum lineare under drought condition[J]. , 2011, 30(2): 156-161.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2011/V30/I2/156

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