Claim · model-written summary
The rectangular hyperbolic light–response curve failed to give good fits at high VPD.
- Taxon
- Switchgrass
Panicum virgatumt0 - Outcome
- good fitse2
- Direction
- failede2
- Qualifier
- at high VPDe2
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“over a young Switchgrass stand”
e2“Consequently, rectangular hyperbolic light–response curve ( NEE partitioning algorithm) consistently failed to provide good fits at high VPD”
Title
Seasonal variability in net ecosystem carbon dioxide exchange over a young Switchgrass stand
Pradeep Wagle; Vijaya Gopal Kakani GCB Bioenergy 2013. doi:10.1111/gcbb.12049
Other claims from this paper (11)
- Association Larger vapor pressure deficit limited switchgrass photosynthesis.
- Observation NEE in the morning hours was higher than in the afternoon at equal light levels.
- Method / resource The modified rectangular hyperbolic light–VPD model significantly improved model performance compared with the rectangular hyperbolic light–response curve.
- Observation The maximum monthly average NEE was −33.02 ± 1.96 μmol CO2 m−2 s−1.
- Observation The highest daily integrated NEE was −35.89 g CO2 m−2 during peak growth.
- Observation Total seasonal ecosystem respiration was about 75% of gross ecosystem photosynthesis regardless of season length or biomass.
- Observation Cumulative seasonal GEP and ER showed large differences between the two seasons.
- Association Net ecosystem carbon uptake increases with increasing GEP.
- Observation Total seasonal uptakes were −1128 ± 130 and −1796 ± 217 g CO2 m−2 in 2011 and 2012 in Chickasha, OK.
- Observation The ecosystem was a net sink of CO2 during 5–6 months.
- Observation The annual carbon status of switchgrass can be a small sink to small source if carbon loss from biomass harvesting is considered.