What question did this study set out to answer?

To determine the physiological responses and net ecosystem exchange of carbon dioxide in a boreal black spruce forest across seasonal weather variations.

December 1, 1997Journal of Geophysical Research AtmospheresOpen Access

Physiological responses of a black spruce forest to weather

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Authors

MGMichael L. GouldenUniversity of California, Irvine BDBruce C. DaubeHarvard University SFSongmiao FanNOAA Geophysical Fluid Dynamics Laboratory

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Implication

Observational study reveals balanced annual carbon uptake and respiration in a black spruce forest, indicating strong temperature controls on seasonal photosynthetic recovery.

Key Points

To determine the physiological responses and net ecosystem exchange of carbon dioxide in a boreal black spruce forest across seasonal weather variations.
Monitored net atmospheric CO2 exchange over 16,500 hours between March 16, 1994, and October 31, 1996, in a Manitoba black spruce (Picea mariana) stand using eddy covariance.
Partitioned net CO2 flux into gross photosynthesis and respiration by modeling daytime respiration as a function of air temperature.
Annual gross primary production and ecosystem respiration each totaled approximately 8 t C ha⁻¹ yr⁻¹, showing winter suppression and spring recovery.
Respiration increased with air temperature at a Q₁₀ of ~2 (reaching 2–8 µmol m⁻² s⁻¹ at 15°C), while gross photosynthesis under high light was negligible below 0°C, increased linearly between 0°C and 14°C, and leveled off above 14°C.
Gross CO₂ uptake at temperatures exceeding 14°C exhibited a quantum yield of 0.05 mol CO₂ mol⁻¹ photons and saturated at 8–18 µmol m⁻² s⁻¹ at photon flux densities above 500–700 µmol m⁻² s⁻¹, unaffected by evaporative demand or soil moisture deficits.

Cite This Study

Goulden et al. (1997) studied this question.

synapsesocial.com/papers/6a8e8ceffde6baa80a8e045f https://doi.org/10.1029/97jd01111

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Implication

Observational study reveals balanced annual carbon uptake and respiration in a black spruce forest, indicating strong temperature controls on seasonal photosynthetic recovery.

Physiological responses of a black spruce forest to weather

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Implication

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Cite This Study

Physiological responses of a black spruce forest to weather

Discussion

Member takes

Implication

Key Points

Cite This Study

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