Temperature Control of Spring CO2 Fluxes at a Coniferous Forest and a Peat Bog in Central Siberia

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http://hdl.handle.net/10138/334181

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Park , S-B , Knohl , A , Migliavacca , M , Thum , T , Vesala , T , Peltola , O , Mammarella , I , Prokushkin , A , Kolle , O , Lavric , J , Park , S S & Heimann , M 2021 , ' Temperature Control of Spring CO2 Fluxes at a Coniferous Forest and a Peat Bog in Central Siberia ' , Atmosphere , vol. 12 , no. 8 , 984 . https://doi.org/10.3390/atmos12080984

Title: Temperature Control of Spring CO2 Fluxes at a Coniferous Forest and a Peat Bog in Central Siberia
Author: Park, Sung-Bin; Knohl, Alexander; Migliavacca, Mirco; Thum, Tea; Vesala, Timo; Peltola, Olli; Mammarella, Ivan; Prokushkin, Anatoly; Kolle, Olaf; Lavric, Jost; Park, Sang Seo; Heimann, Martin
Contributor: University of Helsinki, Viikki Plant Science Centre (ViPS)
University of Helsinki, Micrometeorology and biogeochemical cycles
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2021-08
Language: eng
Number of pages: 19
Belongs to series: Atmosphere
ISSN: 2073-4433
URI: http://hdl.handle.net/10138/334181
Abstract: Climate change impacts the characteristics of the vegetation carbon-uptake process in the northern Eurasian terrestrial ecosystem. However, the currently available direct CO2 flux measurement datasets, particularly for central Siberia, are insufficient for understanding the current condition in the northern Eurasian carbon cycle. Here, we report daily and seasonal interannual variations in CO2 fluxes and associated abiotic factors measured using eddy covariance in a coniferous forest and a bog near Zotino, Krasnoyarsk Krai, Russia, for April to early June, 2013-2017. Despite the snow not being completely melted, both ecosystems became weak net CO2 sinks if the air temperature was warm enough for photosynthesis. The forest became a net CO2 sink 7-16 days earlier than the bog. After the surface soil temperature exceeded similar to 1 degrees C, the ecosystems became persistent net CO2 sinks. Net ecosystem productivity was highest in 2015 for both ecosystems because of the anomalously high air temperature in May compared with other years. Our findings demonstrate that long-term monitoring of flux measurements at the site level, particularly during winter and its transition to spring, is essential for understanding the responses of the northern Eurasian ecosystem to spring warming.
Subject: spring
eddy covariance
CO2 flux
temperature
snowmelt
boreal forest
peatland
Siberia
carbon cycle
northern Eurasia
PHOTOSYNTHETICALLY ACTIVE RADIATION
ECOSYSTEM-ATMOSPHERE EXCHANGE
CARBON-DIOXIDE EXCHANGE
BOREAL NORWAY SPRUCE
EDDY COVARIANCE
INTERANNUAL VARIABILITY
SCOTS PINE
SPATIAL VARIABILITY
PIGMENT COMPOSITION
NORTHERN PEATLAND
1172 Environmental sciences
1171 Geosciences
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