a global scale mechanistic model of photosynthetic capacity (luna v1.0)
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ID: 184849
2016
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Abstract
Although plant photosynthetic capacity as determined by the maximum
carboxylation rate (i.e., Vc, max25) and the maximum electron transport
rate (i.e., Jmax25) at a reference temperature (generally 25 °C) is
known to vary considerably in space and time in response to environmental
conditions, it is typically parameterized in Earth system models (ESMs) with
tabulated values associated with plant functional types. In this study, we
have developed a mechanistic model of leaf utilization of nitrogen for
assimilation (LUNA) to predict photosynthetic capacity at the
global scale under different environmental conditions. We adopt an
optimality hypothesis to nitrogen allocation among light capture, electron
transport, carboxylation and respiration. The LUNA model is able to
reasonably capture the measured spatial and temporal patterns of
photosynthetic capacity as it explains ∼ 55 % of the global
variation in observed values of Vc, max25 and ∼ 65 % of the variation in the observed values of Jmax25. Model
simulations with LUNA under current and future climate conditions
demonstrate that modeled values of Vc, max25 are most affected in
high-latitude regions under future climates. ESMs that relate the values of
Vc, max25 or Jmax25 to plant functional types only are likely to
substantially overestimate future global photosynthesis.
| Reference Key |
ali2016geoscientifica
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|---|---|
| Authors | ;A. A. Ali;C. Xu;A. Rogers;R. A. Fisher;S. D. Wullschleger;E. C. Massoud;J. A. Vrugt;J. D. Muss;N. G. McDowell;J. B. Fisher;P. B. Reich;C. J. Wilson |
| Journal | international journal of quantum chemistry |
| Year | 2016 |
| DOI |
10.5194/gmd-9-587-2016
|
| URL | |
| Keywords |
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