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Category: Ecological Research

Title: Fact Sheet: Field Considerations for Measuring Evapotranspiration with the Eddy Covariance Method. Ecological Restoration Institute

Author: Ha, W., * Masek Lopez, S., Springer, A.E.

Subject: Evapotranspiration

Abstract: In semi-arid ponderosa pine forests of the southwestern US, up to 90% of the annual water budget is re-turned to the atmosphere through evapotranspiration (ET). Accurate measurements of this component of the water budget are, therefore, critical to assess hydrological responses to planned forest restoration. The eddy covariance (EC) method is an atmospheric measurement technique that yields accurate ET measurements. The EC method calculates vertical turbulent fluxes within an atmospheric boundary layer over natural eco-systems and agricultural systems to determine gas exchange rates (e.g., water vapor concentration, carbon dioxide (CO2) concentration) (Burba 2013). Both natural and human-mediated processes affect forest gas exchange. Recent studies of both wildfire and forest restoration treatments in stands of ponderosa pine show a reduction of ET compared to an undisturbed forest site (Dore et al. 2010). Application of EC to investigate CO2 and water fluxes in ponderosa pine forest improves understanding of CO2 and water flux exchange pat-terns. This fact sheet describes installation of an EC system, including flux tower placement requirements and maintenance of scientific instruments.

Date: 2014

Type: Fact Sheet

Source: ERI - Fact Sheet

Identifier: 4 p.

Publisher: Ecological Restoration Institute

Format: PDF

Language: English