Photosynthetic response to variation in CO concentrations and temperature of four broad-leaved
trees in Beijing region

doi:10.1007/s11461-008-0046-3

Front. For. China

2008, Vol. 3

Issue (3) : 364-368 https://doi.org/10.1007/s11461-008-0046-3

Photosynthetic response to variation in CO concentrations and temperature of four broad-leaved trees in Beijing region

MA Zhibo¹, SHI Shengqing², MA Qinyan³, WANG Yutao³, LIU Xingliang³, WANG Yutao⁴, LIU Xingliang⁵

1.Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forest University; Langfang Agricultural and Forestry Academy; 2.Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry; 3.Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forest University; 4.Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forest University; School of Forest Force, The Command College of Chinese Armed Police Force; 5.Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forest University; Sichuan Academy of Forestry

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Abstract Responses of the photosynthetic characteristics to variation in CO₂ concentration and temperature of Ginkgo biloba, Eucommia ulmoides, Magnolia denudata and Tilia japonica were measured during the peak growing season. The results show that the ambient CO₂ concentration could not meet the requirements for photosynthesis of these four species. The optimal temperatures for photosynthesis were lower than the average daytime air temperature. Hence, the photosynthesis of these four species was restricted by the low CO₂ concentration and high daytime air temperature at the time of measurement. Marked enhancements in the net photosynthetic rate were found in all four species when the CO₂ concentration was doubled. When the dependency on CO₂ and temperature were examined simultaneously, it was seen that for increased CO₂ concentrations there was a shift in the optimum temperature for M. denudata and T. japonica towards higher temperatures. Due to their independence on CO₂ concentrations, this trend could not be found in the G. biloba and E. ulmoides data sets. The stomatal conductance (G_s) was sensitive to a vapor pressure deficit (VPD) which in turn was sensitive to temperature. An increase in temperature would cause the VPD to increase and plants might be assumed to react by reducing their stomatal apertures. The effect on stomatal resistance would be most significant at high temperatures. The restriction to stomatal conductance for these four species would increase if CO₂ concentrations were elevated at the same temperature.

Issue Date: 05 September 2008

Cite this article:

SHI Shengqing,MA Zhibo,LIU Xingliang, et al. Photosynthetic response to variation in CO concentrations and temperature of four broad-leaved trees in Beijing region[J]. Front. For. China, 2008, 3(3): 364-368.

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https://academic.hep.com.cn/ffc/EN/10.1007/s11461-008-0046-3
https://academic.hep.com.cn/ffc/EN/Y2008/V3/I3/364

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