Comparing ecosystem and soil respiration : Review and key challenges of tower-based and soil measurements

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Barba , J , Cueva , A , Bahn , M , Barron-Gafford , GA , Bond-Lamberty , B , Hanson , PJ , Jaimes , A , Kulmala , L-M , Pumpanen , J , Scott , RL , Wohlfahrt , G & Vargas , R 2018 , ' Comparing ecosystem and soil respiration : Review and key challenges of tower-based and soil measurements ' , Agricultural and Forest Meteorology , vol. 249 , pp. 434-443 . https://doi.org/10.1016/j.agrformet.2017.10.028

Title: Comparing ecosystem and soil respiration : Review and key challenges of tower-based and soil measurements
Author: Barba, J; Cueva, A; Bahn, M; Barron-Gafford , GA; Bond-Lamberty, B; Hanson, PJ; Jaimes, A; Kulmala, Liisa-Maija; Pumpanen, J; Scott, RL; Wohlfahrt, G; Vargas, R
Contributor organization: Department of Forest Sciences
Ecosystem processes (INAR Forest Sciences)
Forest Ecology and Management
Date: 2018-02-15
Language: eng
Number of pages: 10
Belongs to series: Agricultural and Forest Meteorology
ISSN: 0168-1923
DOI: https://doi.org/10.1016/j.agrformet.2017.10.028
URI: http://hdl.handle.net/10138/308539
Abstract: The net ecosystem exchange (NEE) is the difference between ecosystem CO2 assimilation and CO2 losses to the atmosphere. Ecosystem respiration (R-eco), the efflux of CO2 from the ecosystem to the atmosphere, includes the soil-to-atmosphere carbon flux (i.e., soil respiration; R-soil) and aboveground plant respiration. Therefore, R-soil is a fraction of R-eco and theoretically has to be smaller than R-eco at daily, seasonal, and annual scales. However, several studies estimating R-eco with the eddy covariance technique and measuring R-soll within the footprint of the tower have reported higher R-soil than R-eco, at different time scales. Here, we compare four different and contrasting ecosystems (from forest to grasslands, and from boreal to semiarid) to test if measurements of R-eco are consistently higher than R-soil. In general, both fluxes showed similar temporal patterns, but R-eco, was not consistently higher than R-soil from daily to annual scales across sites. We identified several issues that apply for measuring NEE and measuring/upscaling R-soil that could result in an underestimation of R-eco and/or an overestimation of R-soil. These issues are discussed based on (a) nighttime measurements of NEE, (b) R-soil measurements, and (c) the interpretation of the functional relationships of these fluxes with temperature (i.e., Q(10)). We highlight that there is still a need for better integration of R-soil with eddy covariance measurements to address challenges related to the spatial and temporal variability of R-eco, and R-soil.
Subject: 1172 Environmental sciences
4112 Forestry
Net ecosystem exchange (NEE)
SOIL CO2 EFFLUX
TEMPERATURE SENSITIVITY
Q(10)
EDDY COVARIANCE
AmeriFlux
FLUXNET
EDDY COVARIANCE TECHNIQUE
GAP FILLING STRATEGIES
CO2 FLUX MEASUREMENTS
SURFACE-AIR EXCHANGE
CARBON-DIOXIDE FLUX
CHAMBER MEASUREMENTS
LONG-TERM
TALL VEGETATION
MICROMETEOROLOGICAL OBSERVATIONS
Net ecosystem exchange (NEE)
Soil CO2 efflux
Temperature sensitivity
Q(10)
Eddy covariance
AmeriFlux
FLUXNET
EDDY COVARIANCE TECHNIQUE
GAP FILLING STRATEGIES
CO2 FLUX MEASUREMENTS
SURFACE-AIR EXCHANGE
CARBON-DIOXIDE FLUX
CHAMBER MEASUREMENTS
LONG-TERM
TALL VEGETATION
MICROMETEOROLOGICAL OBSERVATIONS
TEMPERATURE SENSITIVITY
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion


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