ACCLIMATION OF CATHAYA ARGYROPHYLLA TO LIGHT ACROSS A GRADIENT OF CANOPY OPENNESS

doi:10.17521/cjpe.2005.0095

Abstract

Abstract:

A preliminary study was carried out to study the acclimation of saplings of Cathaya argyrophylla to light across a gradient of canopy openness within a typical forest gap (≈100 m²) at Jin Fo Shan of Sichuan Province. Photosynthesis related eco-physiological traits of fully expanded leaves were measured by gas-exchange techniques, the canopy openness of experimental leaves was measured by a modified fish-eye method, and the current growth status of experimental saplings was investigated. Better acclimation of saplings at the site of gap edge was indicated by higher growth status of above-ground parts, higher height growth rate in last year, higher average basal stem growth rate, and higher crown expedition rate in last year than saplings in the understorey or gap center sites. With increasing canopy openness, the maximum net photosynthetic rate per leaf area, the dark respiration rate per leaf area, and specific leaf mass increased showing significant positive correlations to canopy openness. With increasing canopy openness, leaf area and dark respiration rate per leaf mass decreased slightly, the maximum net photosynthetic rate per leaf mass and single leaf mass increased slightly, but there were no significant correlations with canopy openness. Across the gradient of canopy openness, the phenotypic plasticity index was slightly lower than the ecophysiological plasticity index, but the differences were not significant.

Key words: Physio-ecological parameters, Canopy openness, Ecological plasticity

FAN Da-Yong, ZHANG Wang-Feng, CHEN Zhi-Gang, XIE Zong-Qiang. ACCLIMATION OF CATHAYA ARGYROPHYLLA TO LIGHT ACROSS A GRADIENT OF CANOPY OPENNESS[J]. Chin J Plant Ecol, 2005, 29(5): 713-723.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2005.0095

https://www.plant-ecology.com/EN/Y2005/V29/I5/713

Figures/Tables 6

References 29

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	CO	SLM	R_darea	P_narea	LA	LAI	P_nmass	LM	R_dmass
林冠开度CO	1
比叶重SLM	0.746^**	1
单位叶片面积暗呼吸速率R_darea	-0.420^*	-0.363^*	1
单位叶片面积净光合速率P_narea	0.553^**	0.403^*	-0.082	1
单叶叶面积LA	0.011	-0.107	0.015	0.123	1
叶面积指数LAI	-	-0.780^**	0.334	-0.537^*	0.150	1
单位叶片质量净光合速率P_nmass	0.323	0.080	0.062	0.942^*	0.193	-0.297	1
单叶干物质重LM	0.383^*	0.332	-0.163	0.266	0.787^**	-0.275	0.182	1
单位叶片质量暗呼吸速率R_dmass	-0.086	0.072	0.900^**	0.114	-0.044	-0.010	0.119	-0.029	1

	CO	SLM	R_darea	P_narea	LA	LAI	P_nmass	LM	R_dmass
林冠开度CO	1
比叶重SLM	0.746^**	1
单位叶片面积暗呼吸速率R_darea	-0.420^*	-0.363^*	1
单位叶片面积净光合速率P_narea	0.553^**	0.403^*	-0.082	1
单叶叶面积LA	0.011	-0.107	0.015	0.123	1
叶面积指数LAI	-	-0.780^**	0.334	-0.537^*	0.150	1
单位叶片质量净光合速率P_nmass	0.323	0.080	0.062	0.942^*	0.193	-0.297	1
单叶干物质重LM	0.383^*	0.332	-0.163	0.266	0.787^**	-0.275	0.182	1
单位叶片质量暗呼吸速率R_dmass	-0.086	0.072	0.900^**	0.114	-0.044	-0.010	0.119	-0.029	1

表型及生理生态参数 Phenotypic and eco-physiological parameters	可塑性指标 Plasticity index	平均值 Means	表型可塑性及生理生态参数可塑性之间的差异显著性 Significance between PI (plasticity index) of phenotypic and eco-physiological parameters
当年树高生长量HG	51.32	可塑性指数 Phenotypic parameters
当年冠幅生长量CG	92.28	65.37	p>0.1
平均地茎生长量DG	60.03
单叶叶面积LA	66.47
单叶叶干物质重LM	74.93
比叶重SLM	47.16
单位叶片面积最大净光合速率P_narea	80.48
单位叶片质量最大净光合速率P_nmass	77.26	生理生态参数 Eco-physiological parameters
单位叶片面积暗呼吸速率R_darea	56.26	67.87
单位叶片质量暗呼吸速率R_dmass	57.47

表型及生理生态参数 Phenotypic and eco-physiological parameters	可塑性指标 Plasticity index	平均值 Means	表型可塑性及生理生态参数可塑性之间的差异显著性 Significance between PI (plasticity index) of phenotypic and eco-physiological parameters
当年树高生长量HG	51.32	可塑性指数 Phenotypic parameters
当年冠幅生长量CG	92.28	65.37	p>0.1
平均地茎生长量DG	60.03
单叶叶面积LA	66.47
单叶叶干物质重LM	74.93
比叶重SLM	47.16
单位叶片面积最大净光合速率P_narea	80.48
单位叶片质量最大净光合速率P_nmass	77.26	生理生态参数 Eco-physiological parameters
单位叶片面积暗呼吸速率R_darea	56.26	67.87
单位叶片质量暗呼吸速率R_dmass	57.47