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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