Lec10TranspirationAndWaterStress

Transpiration shallow avalanche deep avalanche dry

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Unformatted text preview: nt of elastic stems. Transpiration Shallow avalanche Deep avalanche Dry sand W et sand Dry sand 0.2 0.1 0.05 Pressure of dry sand avalanches (0.00187 N mm-2) 0.02 0.01 0.005 __________ Sand Stem tip movement acting on: __________ 1/10th of leaf area S.plumieri I.pes-caprae A.populifolia S.plumieri I.pes-caprae A.populifolia I.pes-caprae 0.0002 0.0001 0.00005 S.plumieri 0.002 0.001 0.0005 A.populifolia Pressure needed to bend o -2 a stem by 30 (N mm ) Compact, wet sand layer ___ Entire leaf Transpiration SPAC A cell pressure probe in action: http://www.plantsciences.ucdavis.edu/plant sciences_faculty/zwieniecki/methods/Press ureProbe/pressureprobe.html Transpiration Air-Plant-Soil Continuum (the end) • Stoma - Air – – – – Boundary layer Transpiration tradeoff Stomatal conductance Leaf anatomy/morphology – Stomatal function two ep Stoma = 1 complex of 2 guard cells with 2 epidermal cells (stomate=stoma) Stomata = many Air – Plant – Soil Continuum Images of stomata (closed) from each of the four sp...
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