Wind-induced leaf transpiration

Cheng Wei Huang, Chia Ren Chu, Cheng I. Hsieh, Sari Palmroth, Gabriel G. Katul

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

While the significance of leaf transpiration (fe) on carbon and water cycling is rarely disputed, conflicting evidence has been reported on how increasing mean wind speed (U) impacts fe from leaves. Here, conditions promoting enhancement or suppression of fe with increasing U for a wide range of environmental conditions are explored numerically using leaf-level gas exchange theories that combine a stomatal conductance model based on optimal water use strategies (maximizing the 'net' carbon gain at a given fe), energy balance considerations, and biochemical demand for CO2. The analysis showed monotonic increases in fe with increasing U at low light levels. However, a decline in modeled fe with increasing U were predicted at high light levels but only in certain instances. The dominant mechanism explaining this decline in modeled fe with increasing U is a shift from evaporative cooling to surface heating at high light levels. New and published sap flow measurements for potted Pachira macrocarpa and Messerschmidia argentea plants conducted in a wind tunnel across a wide range of U (2-8 m s-1) and two different soil moisture conditions were also employed to assess how fe varies with increasing U. The radiative forcing imposed in the wind tunnel was only restricted to the lower end of expected field conditions. At this low light regime, the findings from the wind tunnel experiments were consistent with the predicted trends.

Original languageEnglish
Pages (from-to)240-255
Number of pages16
JournalAdvances in Water Resources
Volume86
DOIs
StatePublished - 1 Dec 2015

Keywords

  • Energy balance
  • Laminar boundary layer
  • Leaf-level gas exchange
  • Optimality hypothesis
  • Wind effects

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