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Comparison of tree transpiration under wet and dry canopy conditions in a Costa Rican premontane tropical forest

Journal Article · · Hydrological Processes
DOI:https://doi.org/10.1002/hyp.10960· OSTI ID:1467619
 [1];  [2];  [2];  [2]
  1. Texas A & M Univ., College Station, TX (United States); Texas A&M University, Civil Engineering
  2. Texas A & M Univ., College Station, TX (United States)

Spatial and temporal variation in wet canopy conditions following precipitation events can influence processes such as transpiration and photosynthesis, which can be additionally enhanced as upper canopy leaves dry more rapidly than the understory following each event. As part of a larger study aimed at improving land surface modelling of evapotranspiration processes in wet tropical forests, we compared transpiration among trees with exposed and shaded crowns under both wet and dry canopy conditions in central Costa Rica, which has an average 420 mm annual rainfall. Transpiration was estimated for 5 months using 43 sap flux sensors in eight dominant, ten midstory and eight suppressed trees in a mature forest stand surrounding a 40-m tower equipped with micrometeorological sensors. Dominant trees were 13% of the plot's trees and contributed around 76% to total transpiration at this site, whereas midstory and suppressed trees contributed 18 and 5%, respectively. After accounting for vapour pressure deficit and solar radiation, leaf wetness was a significant driver of sap flux, reducing it by as much as 28%. Under dry conditions, sap flux rates (Js) of dominant trees were similar to midstory trees and were almost double that of suppressed trees. On wet days, all trees had similarly low Js. As expected, semi-dry conditions (dry upper canopy) led to higher Js in dominant trees than midstory, which had wetter leaves, but semi-dry conditions only reduced total stand transpiration slightly and did not change the relative proportion of transpiration from dominant and midstory. Thus, models that better capture forest stand wet–dry canopy dynamics and individual tree water use strategies are needed to improve accuracy of predictions of water recycling over tropical forests.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23). Climate and Environmental Sciences Division
Grant/Contract Number:
SC0010654
OSTI ID:
1467619
Journal Information:
Hydrological Processes, Journal Name: Hydrological Processes Journal Issue: 26 Vol. 30; ISSN 0885-6087
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (15)

Species-Specific Shifts in Diurnal Sap Velocity Dynamics and Hysteretic Behavior of Ecophysiological Variables During the 2015–2016 El Niño Event in the Amazon Forest journal June 2019
Drone‐based photogrammetry‐derived crown metrics for predicting tree and oil palm water use journal June 2019
Does fluctuation of meteorological conditions across years influence stand transpiration of Tectona grandis plantation? journal June 2019
Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics journal September 2019
Transpiration and stomatal conductance in a young secondary tropical montane forest: contrasts between native trees and invasive understorey shrubs journal April 2018
ENSO effects on the transpiration of eastern Amazon trees journal October 2018
Foliar water uptake in Amazonian trees: Evidence and consequences journal May 2019
Plant water use responses along secondary forest succession during the 2015-2016 El Niño drought in Panama journal March 2018
The value of wet leaves journal June 2018
Relevance of wood anatomy and size of Amazonian trees in the determination and allometry of sapwood area journal March 2019
Arboreal epiphytes in the soil-atmosphere interface text January 2020
Arboreal Epiphytes in the Soil-Atmosphere Interface: How Often Are the Biggest “Buckets” in the Canopy Empty? journal August 2019
Sensitivity of Evapotranspiration Components in Remote Sensing-Based Models journal October 2018
Transpiration and stomatal conductance in a young secondary tropical montane forest: contrasts between native trees and invasive understorey shrubs text January 2018
Contribution of understory evaporation in a tropical wet forest during the dry season journal January 2020

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