Optimized stomatal conductance of vegetated land surfaces and its effects on simulated productivity and climate

Details Optimized stomatal conductance of vegetated land surfaces and its effects on simulated productivity and climate Optimized stomatal conductance of vegetated land surfaces and its effects on simulated productivity and climate

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3121203k&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 21, CiteID L21203

Physics

8

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Hydrology: Evapotranspiration, Hydrology: Hydroclimatology, Hydrology: Plant Ecology, Hydrology: Water/Energy Interactions

Scientific paper

The stomatal conductance of terrestrial vegetation affects the exchange fluxes of water and carbon at the land surface. Here, a dynamic vegetation model coupled to a climate model of intermediate complexity is used to demonstrate that an optimum stomatal conductance exists at which the rate of photosynthesis, and therefore vegetation productivity, is at a maximum. This maximum originates from two competing drivers that affect the rate of photosynthesis: (i) increased supply of atmospheric carbon dioxide with increased stomatal conductance and (ii) increased cloud cover, which reduces the supply of sunlight. The simulated climate with optimized stomatal conductance is close to the model's control simulation, but vegetation productivity is substantially enhanced. The existence of this optimum has potentially important implications for the adaptation of terrestrial productivity to different climates. If vegetation maintains this optimum not only in the present-day, but also adapts to it during past (and future) climates, not considering this optimum and how it changes leads to a general underestimation of terrestrial productivity under different climates.

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