What does this research mean for the field?

Spatial variability of the ecosystem transpiration to evapotranspiration ratio (T/ET) is primarily driven by vegetation and soil characteristics rather than climatic variables, although the absolute magnitudes of these estimates remain uncertain across different partitioning methods. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Compare three water-carbon coupling methods for partitioning ecosystem transpiration from total evapotranspiration across global eddy covariance flux towers.

October 6, 2020Socio-Environmental Systems ModelingOpen Access

Ecosystem transpiration and evaporation: Insights from three water flux partitioning methods across FLUXNET sites

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Compare three water-carbon coupling methods for partitioning ecosystem transpiration from total evapotranspiration across global eddy covariance flux towers.
Applied three distinct water-carbon coupling flux partitioning algorithms to daily eddy covariance records across 251 FLUXNET sites worldwide.
Benchmarked transpiration estimates against in situ sap flow observations at six sites.
Evaluated spatial and temporal controls on the transpiration-to-evapotranspiration ratio across 140 sites with at least two continuous years of high-quality data.
Intercomparison among the three partitioning methods revealed strong daily correlation (R = 0.89 to 0.94), but mean transpiration-to-evapotranspiration ratios varied substantially from 45% to 77%.
Eddy-covariance-derived transpiration showed stronger correlations to sap flow transpiration than to total evapotranspiration at benchmark sites.
Transpiration-to-evapotranspiration variability was 1.6 times greater across sites than across years, primarily governed by plant functional type, leaf area index, and soil properties rather than temperature or precipitation.

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Implication

Comparative synthesis reveals consistent ecosystem transpiration patterns across 251 global eddy covariance sites, highlighting vegetation characteristics as primary drivers of water flux.

Cite This Study

Nelson et al. (2020) studied this question.

synapsesocial.com/papers/6aaa63f997cfbebff36cb5e1 https://doi.org/10.1111/gcb.15314

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Implication

Comparative synthesis reveals consistent ecosystem transpiration patterns across 251 global eddy covariance sites, highlighting vegetation characteristics as primary drivers of water flux.

Ecosystem transpiration and evaporation: Insights from three water flux partitioning methods across FLUXNET sites

Key Points

Discussion

Implication

Cite This Study

Ecosystem transpiration and evaporation: Insights from three water flux partitioning methods across FLUXNET sites

Key Points

Discussion

Implication

Cite This Study

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