A study on photosynthetic characteristics ofBetula platyphylla

Abstract

Influences of temperature, humidity, and CO₂ concentration on the photosynthesis and respiration of three-year-oldBetula platyphylla was investigated. Light compensation point, saturation point and CO₂ compensation point were also determined. The results showed that the optimal temperature of photosynthesis and dark respiration was 24 °C and 30 °C, respectively, at ambient CO₂. When relative humidity was 80%,Betula platyphylla could maintain strong photosynthesis. There was no significant correlation between respiration and relative humidity. The light compensation and saturation point was 25 μmol·m⁻²·s⁻¹ and 1 375 μmol·m⁻²·s⁻¹, respectively. The CO₂ compensation point was 180 μL·L⁻¹. The results showed thatBetula platyphylla still had potential to assimilate CO₂ when CO₂ concentration was above 2 400 μL·L⁻¹.

Keywords

Betula platyphylla / Photosynthesis / Respiration / CO₂ concentration / S792.153 / Q954.11 / A

References

[1] Zhiduan Chen Phylogeny and phytogeography of the Betulaceae [J]. Acta Phytotaxonomica Sinica, 1994, 32(1): 1-31.

[2] Xiaoyang Cui Behaviors of nitrogen nutrition ofPinus koraiensis andBetula platyphylla and their interspecific differentiation [J]. Chinese Journal of Applied Ecology, 1998, 9(2): 123-127.

[3] Delucia E., Sasek T.W., Strain B.R. Photosynthetic inhibition after long-term exposure to elevated levels of atmospheric carbon dioxide [J]. Photosynthesis Research, 1985, 7: 175-184.

[4] Dippery J.K., Tissue D.T., Thomas R.B., Strain B.R. Effects of low and elevated CO₂ and C₃ and C₄ annuals. I. Growth and biomass allocation [J]. Oecologia, 1995, 101: 13-20.

[5] Dressman D.C., Chee H., Dale J. Expression of genes encoding Rubisco in sugarbeet (Beta vulgaris L.) plants subjected to gradual dessication [J]. Plant Cell Physiology, 1994, 35: 645-653.

[6] Farquhar G.D., Sharkey T.D. Stomatal conductance and photosynthesis [J]. Annu. Rev. Plant Physiol., 1982, 33: 317-345.

[7] Gunderson C.A., Wullschleger S.D. Photosynthetic acclimation in trees to rising atmospheric CO₂: A broader perspective [J]. Photosynthesis Research, 1994, 39: 369-388.

[8] Lepistö, M. 1972. A good seed crop of birch from a plastic greenhouse [J]. Metsälehti, 34.

[9] Lepistö, M. 1973. Accelerated birch breeding in plastic greenhouse [J]. Forestry Chronicle,49(4).

[10] Long S.P., Baker N.R., Raines C.A. Analyzing the responses of photosynthetic CO₂ assimilation to long-term elevation of atmospheric CO₂ concentration [J]. Vegetatio, 1993, 104/105: 33-45.

[11] Nadu C.V., Wang P.M. Seasonal variation in ribulose-1,5-bisphosphate carboxylase activity and its relationship with leaf protein and net photosynthetic rate in tropical deciduous tree species [J]. Photosynthetica, 1995, 31: 85-90.

[12] Nobel P.S. Physicochemical and environmental plant physiology [M], 1991 San Diego: Academic Press

[13] Overdieck D., Reid C., Strain B.R. The effects of prein-dustrial and future CO₂ concentrations on growth, dry matter production and the C/N relationship in plants at low nutrient supply:Vigna unguiculata (cowpea),Abelmoschus esculentus (okra) andRaphanus sativus (radish) [J]. Botanik, 1988, 62: 119-134.

[14] Pearcy R.W., Björkman O., Caldwell M.M., Keely J.E., Monson R.K., Strain B.R. Carbon gain by plants in natural environments [J]. BioScience, 1987, 37: 21-29.

[15] Guoxiong Qiu Measuring the photosynthetic rate of leaf with airflow method. [R] The experimental handbook of plant physiology, 1985 Shanghai: Shanghai Science and Technology Press 88 94 (in Chinese)

[16] Sims D.A., Luo Y., Seemann J.R. Comparison of photosynthetic acclimation to elevated CO₂ and limited nitrogen supply in soybean [J]. Plant Cell and Environment, 1998, 21: 945-952.

[17] Ward J.K., Strain B.R. Elevated CO₂ studies: past, present and future [J]. Tree Physiology, 1999, 19: 211-220.

[18] Woodward F.I. Stomatal numbers are sensitive to increases in CO₂ from pre-industrial levels [J]. Nature, 1987, 327: 617-618.

[19] Yaguang Zhan, Jingyun Li, Jichun Liu et al. Study on green wood cutting propagation techniques ofBetula platyphylla [J]. Journal of Northease Forestry University, 1994, 22(2): 6-10.