Photosynthesis, Canopy Physiology & Micrometeorology Please read Bonan, Chapter 16-17.

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Presentation transcript:

Photosynthesis, Canopy Physiology & Micrometeorology Please read Bonan, Chapter 16-17

Leaf Anatomy Stomate (pl. stomata)

Leaf Fluxes and Resistances Many leaves have stomata only on lower surface Heat fluxes don’t pass through stomata

Adding Resistances Conductance is the reciprocal of resistance Total resistance of a series of resistors is the sum of the individual resistors Total conductance of a set of resistors in parallel is the sum of the individual conductances Resistors in series add resistances Resistors in parallel add conductances

Stomata and Leaf Boundary Layers Stomatal conductance is truly molecular Leaf laminar boundary layer conductance is a mixture of molecular and turbulent diffusion

Laminar Boundary Layer Flow in canopies is complex How do we define “wind speed” a few mm above a pine needle? s/m leaf size (m) wind speed (m/s)

Laminar Boundary Layer Resistance a ~ 200 s ½ m -1

Leaf Temperatures Influence of radiative, sensible, and latent cooling Without H and LE, leaves get really hot!

Leaf Energy Balance Note dependence of latent cooling on air T and R.H. Leaf may be either warmer or cooler than air Imagine a forest full of dappled sunlight on a summer afternoon …

Coupling Between Leaf Fluxes and the Canopy Air Space LE increases with VPD (duh!) Lots of leaf transpiration tends to moisten canopy air space (CAS) Moist CAS suppresses transpiration Degree of dependence (coupling) depends on r b Consider two limiting cases: From Penman-Monteith Jarvis and McNaughton (1986) r b large, radiation limited r b small, stomata limited