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欧美杨107不同冠层光合特性的研究(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2011年04期
Page:
39-42
Column:
研究论文
publishdate:
2011-07-31

Article Info:/Info

Title:
Research on photosynthesis characteristics in different canopy layers of poplar clone 107 (Populus×euramericana cv.Neva)
Author(s):
MA Yongchun12 FANG Shengzuo1*
1.College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China; 2.Anhui Province Extension Stationgeneral of Forestry Science and Technology, Hefei 230001, China
Keywords:
Populus×euramericana cv. Neva light response curve net photosynthesis rate path analysis
Classification number :
S792.11;S718.3
DOI:
10.3969/j.jssn.1000-2006.2011.04.008
Document Code:
A
Abstract:
Light response curve and diurnal change of photosynthesis characteristics were measured in different canopy layers of poplar clone 107 (Populus×euramericana cv. Neva), and the main ecophysiological factors affecting net photosynthesis rate were analyzed. The results showed that light response curve of different canopy layers of poplar clone 107 was simulated better with a new model of Pn=α(1-βI)(I-Icp)1+rI. The maximum net photosynthetic rate of the canopy Ⅰ, Ⅱ and Ⅲ displayed in light response curve were 10.076, 10.152 and 12.318μmol/(m2·s) respectively. And the diurnal average of net photosynthetic rate of the canopy displayed in an ascending order as: canopy Ⅰ,Ⅱ and Ⅲ. These results showed that the StrongWeak order of canopy photosynthetic capacity was the canopy Ⅲ, Ⅱ, Ⅰ. The contributions of main ecophysiological factors to net photosynthetic rate in different canopy layers were determined using Path Analysis. For canopy Ⅰand Ⅱ, the consistency of CO2 among cells and air temperature were the main factors to impact net photosynthetic rate. For the canopy Ⅲ, stomatal conductance, consistency of CO2 among cells, photosynthetic active radiation and air temperature were the main factors.

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Last Update: 2011-08-13