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Rajit Patankar, Behzad Mortazavi, Steven F. Oberbauer and Gregory Starr Diurnal patterns of gas-exchange and metabolic pools in tundra plants during three phases of the arctic growing season Ecology and Evolution 3

Version of Record online: 11 JAN 2013 | DOI: 10.1002/ece3.467

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Arctic tundra plant communities are subject to a short growing season that is the primary period in which carbon is sequestered for growth and survival. This period is often characterized by 24-h photoperiods for several months a year. We found clear diurnal patterns in photosynthesis and respiration, with midday peaks and midnight lulls indicative of circadian regulation. This understanding of diurnal physiology will also enhance the parameterization of process-based models, which will aid in better predicting future carbon dynamics for the tundra.

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