Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites

0507614 - ÚVGZ 2020 RIV US eng J - Článek v odborném periodiku
Ziemblinska, K. - Urbaniak, M. - Dukat, P. - Olejnik, Janusz
Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites.
Jove-Journal of Visualized Experiments. jun, č. 148 (2019), s. 1-9, č. článku e59525. ISSN 1940-087X
Výzkumná infrastruktura: CzeCOS II - 90061
Institucionální podpora: RVO:86652079
Klíčová slova: net ecosystem exchange * carbon-dioxide exchange * boreal * forests * energy * assimilation * respiration * separation * balance * sink * Environmental Sciences * Issue 148 * eddy covariance * windthrow * CO2 fluxes * filtering * measuring site setup * gap filling
Obor OECD: Meteorology and atmospheric sciences
Impakt faktor: 1.163, rok: 2019
Způsob publikování: Open access
https://www.jove.com/video/59525/measurements-of-co2-fluxes-at-non-ideal-eddy-covariance-sites

This protocol is an example of utilizing the eddy covariance (EC) technique to investigate spatially and temporally averaged net CO2 fluxes (net ecosystem production, NEP), in non-typical ecosystems, on a currently reforested windthrow area in Poland. After a tornado event, a relatively narrow 'corridor' was created within surviving forest stands, which complicates such kind of experiments. The application of other measuring techniques, such as the chamber method, is even more difficult under these circumstances, because especially at the beginning, fallen trees and in general great heterogeneity of the site provide a challenging platform to perform flux measurements and then to properly upscale obtained results. In comparison with standard EC measurements carried out in untouched forests, the case of windthrow areas requires special consideration when it comes to the site location and data analysis in order to ensure their representativeness. Therefore, here we present a protocol of real-time, continuous CO2 flux measurements at a dynamically changing, non-ideal EC site, which includes (1) site location and instrumentation setup, (2) flux computation, (3) rigorous data filtering and quality control, and (4) gap filling and net fluxes partitioning into CO2 respiration and absorption. The main advantage of the described methodology is that it provides a detailed description of the experimental setup and measurement performance from scratch, which can be applied to other spatially limited ecosystems. It can also be viewed as a list of recommendations on how to deal with unconventional site operation, providing a description for non-specialists. Obtained quality-checked, gap filled, half-hour values of net CO2, as well as absorption and respiration fluxes, can be finally aggregated into daily, monthly, seasonal or annual totals.
Trvalý link: http://hdl.handle.net/11104/0298727