Carbon and water flux responses to physiology by environment interactions: a sensitivity analysis of variation in climate on photosynthetic and stomatal parameters

Sensitivity of carbon uptake and water use estimates to changes in physiology was determined with a coupled photosynthesis and stomatal conductance (g ₛ) model, linked to canopy microclimate with a spatially explicit scheme (MAESTRA). The sensitivity analyses were conducted over the range of intrasp...

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Bibliographic Details
Published in:Climate dynamics Vol. 42; no. 9-10; pp. 2539 - 2554
Main Authors: Bauerle, William L, Daniels, Alex B, Barnard, David M
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer-Verlag 01.05.2014
Springer Berlin Heidelberg
Springer
Springer Nature B.V
Subjects:
Acer rubrum
Air temperature
Anatomy & physiology
Animal and plant ecology
Animal, plant and microbial ecology
Autoecology
Biological and medical sciences
C3 photosynthesis
Canopies
canopy
Carbon
Carbon cycle (Biogeochemistry)
Carbon dioxide
carboxylation
climate
Climatic conditions
Climatology
Earth and Environmental Science
Earth Sciences
ecophysiology
electron transfer
Environment
Environmental aspects
Fundamental and applied biological sciences. Psychology
Geophysics/Geodesy
hardwood
intraspecific variation
Microclimate
Oceanography
Parameter estimation
Photosynthesis
photosynthetically active radiation
Physiological aspects
Physiology
Phytochemistry
Plants and fungi
Relative humidity
ribulose-bisphosphate carboxylase
Sensitivity analysis
Stomatal conductance
Transpiration
vegetation
Water exchange
water uptake
Water use
Wind speed
United States
Model input
Transpiration
Sensitivity analysis
Carbon
Global
Stomatal conductance
Plant
Flux
Environmental factor
Simulation model
Photosynthesis
Climate variation
ISSN:0930-7575, 1432-0894
Online Access:Get full text
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Summary:Sensitivity of carbon uptake and water use estimates to changes in physiology was determined with a coupled photosynthesis and stomatal conductance (g ₛ) model, linked to canopy microclimate with a spatially explicit scheme (MAESTRA). The sensitivity analyses were conducted over the range of intraspecific physiology parameter variation observed for Acer rubrum L. and temperate hardwood C₃ (C₃) vegetation across the following climate conditions: carbon dioxide concentration 200–700 ppm, photosynthetically active radiation 50–2,000 μmol m⁻² s⁻¹, air temperature 5–40 °C, relative humidity 5–95 %, and wind speed at the top of the canopy 1–10 m s⁻¹. Five key physiological inputs [quantum yield of electron transport (α), minimum stomatal conductance (g ₀), stomatal sensitivity to the marginal water cost of carbon gain (g ₁), maximum rate of electron transport (J ₘₐₓ), and maximum carboxylation rate of Rubisco (V cₘₐₓ)] changed carbon and water flux estimates ≥15 % in response to climate gradients; variation in α, J ₘₐₓ, and V cₘₐₓ input resulted in up to ~50 and 82 % intraspecific and C₃ photosynthesis estimate output differences respectively. Transpiration estimates were affected up to ~46 and 147 % by differences in intraspecific and C₃ g ₁ and g ₀ values—two parameters previously overlooked in modeling land–atmosphere carbon and water exchange. We show that a variable environment, within a canopy or along a climate gradient, changes the spatial parameter effects of g ₀, g ₁, α, J ₘₐₓ, and V cₘₐₓ in photosynthesis-g ₛ models. Since variation in physiology parameter input effects are dependent on climate, this approach can be used to assess the geographical importance of key physiology model inputs when estimating large scale carbon and water exchange.
Bibliography:http://dx.doi.org/10.1007/s00382-013-1894-6
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ISSN:0930-7575
1432-0894
DOI:10.1007/s00382-013-1894-6