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Oecologia

, Volume 44, Issue 2, pp 192–198 | Cite as

Photosynthesis and transpiration ofPinus radiata D. Don under natural conditions in a forest stand

  • Udo Benecke
Article

Summary

Gas-exchange ofPinus radiata foliage was measured with climatised cuvettes under natural light in the sun-crown of 8 m tall trees in a forest stand. Measurement began during a period of drought (ψWS −8.2 bar, ψWe −10.5 bar) and continued after elimination of soil moisture-deficit by watering (ψWS −0.5 bar, ψWe −5.5 bar). Soil and air moisture-deficits severely restricted gas-exchange. Watering resulted in an immediate decline in stomatal resistance (r s ) and an increase in net photosynthesis (P N ) of 13%. A slower progressive gas-exchange recovery occurred additionally during the 10 days after watering leading to a further decline inr s to 3 s cm-1 and an ultimate increase inP N of 38% when measured under comparable conditions at 8 mb v.p.d. Radiata pine had a high photosynthetic capacity with a measured maximumP N of 10.2 mg CO2 dm-2 h-1 total needle surface (11.4 mg CO2 g-1 DM h-1).

Optimum temperature forP N in March (late summer) occurred at ca. 18°C. Rate ofP N was 95% saturated at irradiance of 900 μE m-2 s-1 and 50% saturated at only 270 μE m-2 s-1. Radiata pine needles responded directly to changes in atmospheric humidity by adjusting their stomatal diffusive resistance. As a result, between 8 and 18 mb v.p.d.P N declined by 2.3% mb-1 increase.

Keywords

Photosynthesis Natural Condition Late Summer Forest Stand Photosynthetic Capacity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Udo Benecke
    • 1
  1. 1.Forest Research InstituteChristchurchNew Zealand

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