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《Journal of Beijing Forestry University》 1993-01
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A Study on the Characteristics of Photosynthesis and Transpiration in Hybrid Aspen Leaves (BL107)

Wang Yingfang(Commission for Integrated Survey of Natural Resources, China Academy of Sciences)Gao Rongfu(Forest Resources College, BFU)  
Photosynthesis and transpiration of hybrid aspen leaves in different light intensities and CO2 concentrations were measured. The photosynthetic rate and water use efficiency of hybrid aspen, Populus tomentosa f. yixianensis and P. dakuanensis leaves were also compared. Results showed, the photosynthetic light compensation point of mature hybrid aspen (BLl07) leaves was 18μmol·m-2·s-1, the light saturation point was 950μmol·m22·s-1. The photosynthetic rate under light saturation was 16.15μmol·m-2·s-1. The apparent quantum efficiency was 0.033. The transpiration rate increased with increasing light intensity. Increasing the CO2 concentration could increase the photosynthetic rate. The CO2 saturation point was 650 ppm, and CO2 inibition was 1 000 ppm at a light intensity of 1000μmol·m22·s-1, and an air temperature of 25℃. The photosynthetic rate at the CO2 saturation point was 22.26μmol·m22· s-1. The maximum transpiration rate and stomatal conductance was at the CO2 compensation point, i. e. 100ppm. Increasing CO2 concentration could decrease the transpiration rate and stomatal conductance. The leaves with the maximum photosynthetic rate of hybrid aspen (BL107) , P. tomentosa f. yixianensis and P, dakuanensis Hsu were the 20th, 10th and 10th leaf from top of seedlings, respectively. The leaves with maximum photosynthetic rates also had maximum water use efficiency. Water use efficiency of the leaves with maximum photosynthetic rates in hybrid aspen, P. iomentosa f. yixianensis and P .dakuanensis Hsu were 1/84, 1/113 and 1/139, respectively. The best variety for water use efficiency of whole seedlings was BLl07P. tomentosa f. yixianensis P. dakuanensis.
【Fund】: 高等学校博士学科点科研基金
【CateGory Index】: S792.117
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