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ACCLIMATION OF CATHAYA ARGYROPHYLLA TO LIGHT ACROSS A GRADIENT OF CANOPY OPENNESS
Received date: 2004-01-05
Accepted date: 2005-01-05
Online published: 2005-08-30
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.
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]. Chinese Journal of Plant Ecology, 2005 , 29(5) : 713 -723 . DOI: 10.17521/cjpe.2005.0095
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