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Characteristics of free air carbon dioxide enrichment of a northern temperate mature forest CQU.pdf (2.02 MB)

Characteristics of free air carbon dioxide enrichment of a northern temperate mature forest

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Version 2 2023-03-22, 00:31
Version 1 2021-01-17, 13:40
journal contribution
posted on 2023-03-22, 00:31 authored by KM Hart, G Curioni, P Blaen, NJ Harper, P Miles, KF Lewin, J Nagy, EJ Bannister, XM Cai, RM Thomas
In 2017, the Birmingham Institute of Forest Research (BIFoR) began to conduct Free Air Carbon Dioxide Enrichment (FACE) within a mature broadleaf deciduous forest situated in the United Kingdom. BIFoR FACE employs large scale infrastructure, in the form of lattice towers, forming 'arrays' which encircle a forest plot of ~30 m diameter. BIFoR FACE consists of three treatment arrays to elevate local CO2 concentrations (e[CO2 ]) by +150 μmol mol-1 . In practice, acceptable operational enrichment (ambient [CO2 ] + e[CO2 ]) is ± 20% of the set-point 1-minute average target. There are a further three arrays that replicate the infrastructure and deliver ambient air as paired controls for the treatment arrays. For the first growing season with e[CO2 ] (April to November 2017), [CO2 ] measurements in treatment and control arrays show that the target concentration was successfully delivered, i.e.: +147 ± 21 μmol mol-1 (mean ± SD) or 98 ± 14% of set-point enrichment target. e[CO2 ] treatment was accomplished for 97.7% of the scheduled operation time, with the remaining time lost due to engineering faults (0.6% of the time), CO2 supply issues (0.6%), or adverse weather conditions (1.1%). CO2 demand in the facility was driven predominantly by wind speed and the formation of the deciduous canopy. Deviations greater than 10% from the ambient baseline CO2 occurred < 1% of the time in control arrays. Incidences of cross-contamination > 80 μmol mol-1 (i.e., > 53% of the treatment increment) into control arrays accounted for < 0.1% of the enrichment period. The median [CO2 ] values in reconstructed 3-dimensional [CO2 ] fields show enrichment somewhat lower than the target but still well above ambient. The data presented here provide confidence in the facility setup and can be used to guide future next-generation forest FACE facilities built into tall and complex forest stands. This article is protected by copyright. All rights reserved.

Funding

Other

History

Volume

26

Issue

2

Start Page

1023

End Page

1037

Number of Pages

15

eISSN

1365-2486

ISSN

1354-1013

Location

England

Publisher

Wiley-Blackwell Publishing, UK

Additional Rights

CC BY 4.0

Language

eng

Peer Reviewed

  • Yes

Open Access

  • Yes

Acceptance Date

2019-07-15

External Author Affiliations

Yorkshire Water, University of Birmingham, UK; Brookhaven National Laboratory, US

Author Research Institute

  • Institute for Future Farming Systems

Era Eligible

  • Yes

Journal

Global Change Biology