Late-successional and old-growth forest carbon temporal dynamics in the Northern Forest (Northeastern USA)

Abstract. Carbonyl sulfide (OCS) has recently emerged as a tracer for terrestrial carbon uptake. While physiological studies relating OCS fluxes to leaf stomatal dynamics have been established at leaf and branch scales and incorporated into global carbon cycle models, the quantity of data from ecosystem-scale field studies remains limited. In this study, we employ established theoretical relationships to infer ecosystem-scale plant OCS uptake from mixing ratio measurements. OCS fluxes showed a pronounced diurnal cycle, with maximum uptake at midday. OCS uptake was found to scale with independent measurements of CO2 fluxes over a 60 m tall old-growth forest in the Pacific Northwest of the US (45∘49′13.76′′ N, 121∘57′06.88′′ W) at daily and monthly timescales under mid–high light conditions across the growing season in 2015. OCS fluxes were strongly influenced by the fraction of downwelling diffuse light. Finally, we examine the effect of sequential heat waves on fluxes of OCS, CO2, and H2O. Our results bolster previous evidence that ecosystem OCS uptake is strongly related to stomatal dynamics, and measuring this gas improves constraints on estimating photosynthetic rates at the ecosystem scale.

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Structure, spatio-temporal dynamics and disturbance regime of the mixed beech–silver fir–Norway spruce old-growth forest of Biogradska Gora (Montenegro)

Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology ◽

10.1080/11263504.2014.945978 ◽

2014 ◽

Vol 149 (6) ◽

pp. 966-975 ◽

Cited By ~ 12

Author(s):

R. Motta ◽

M. Garbarino ◽

R. Berretti ◽

I. Bjelanovic ◽

E. Borgogno Mondino ◽

...

Keyword(s):

Norway Spruce ◽

Temporal Dynamics ◽

Silver Fir ◽

Disturbance Regime ◽

Old Growth ◽

Old Growth Forest ◽

Spatio Temporal

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Ecosystem fluxes of carbonyl sulfide in an old-growth forest: temporal dynamics and responses to diffuse radiation and heat waves

10.5194/bg-2018-85 ◽

2018 ◽

Cited By ~ 1

Author(s):

Bharat Rastogi ◽

Max Berkelhammer ◽

Sonia Wharton ◽

Mary E. Whelan ◽

Frederick C. Meinzer ◽

...

Keyword(s):

Temporal Dynamics ◽

Heat Waves ◽

Carbonyl Sulfide ◽

Diffuse Radiation ◽

Growing Season ◽

Field Studies ◽

Old Growth ◽

Old Growth Forest ◽

The Pacific ◽

Global Carbon

Abstract. Carbonyl sulfide (OCS) has recently emerged as a tracer for terrestrial carbon uptake. While physiological studies relating OCS fluxes to leaf stomatal dynamics have been established at leaf and branch scales and incorporated in global carbon cycle models, the quantity of data from ecosystem-scale field studies remains limited. In this study we employ established theoretical relationships to infer ecosystem-scale OCS uptake from concentration measurements. OCS uptake was found to scale with independent measurements of CO2 fluxes over a 60-m-tall old-growth forest in the Pacific Northwestern U.S. (45°49′13.76′′ N; 121°57′06.88′′) at hourly and monthly timescales across the growing season in 2015. OCS fluxes tracked changes in soil moisture, and were strongly influenced by the fraction of downwelling diffuse light. Fluxes were also strongly affected by sequential heat waves during the growing season. Our results bolster previous evidence that ecosystem OCS uptake is strongly related to stomatal dynamics, and measuring this gas improves constraints on estimating photosynthetic rates at the ecosystem scale.

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