SEASONAL DYNAMICS OF N2O AND CH4 FLUXES OF BOREAL TREE STEMS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F19%3A00517361" target="_blank" >RIV/86652079:_____/19:00517361 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

SEASONAL DYNAMICS OF N2O AND CH4 FLUXES OF BOREAL TREE STEMS

Popis výsledku v původním jazyce

Boreal forest soils are a natural source of nitrous oxide (N2O) and a sink of methane (CH4). Trees can contribute to ecosystem N2O and CH4 exchange (1) by transporting the gases from soil to the atmosphere, (2) by producing these gases in situ in the plant tissues, (3) by consuming these gases from the atmosphere, or (4) indirectly by altering the soil biochemical or physical conditions. Studies on the N2O and CH4 exchange of mature trees growing in natural field conditions are rare, and the boreal zone trees have not gained much attention. Studies on the seasonality of the tree CH4 and N2O fluxes have been lacking. We measured the stem fluxes of N2O and CH4 from mature pine, spruce and birch trees at three plots with naturally different soil moisture ( soil volumetric water content): Wet (0.81 m 3 m −3 ), moderately wet (0.40 m 3 m −3 ), and dry (0.21 m 3 m −3 ). The fluxes were determined between June 2014 and May 2015, using static chambers and gas chromatographic analyses. There were significant seasonal dynamics in the stem N2O and CH4 exchange. The N2O exchange was clearly connected to the tree physiological activity, while the CH4 flux had only weak relation to physiological activity. Positive correlation between N2O flux and evapotranspiration supports our hypothesis that N2O is transported from soil via the transpiration stream. The CH4 fluxes of birch and pine trees were clearly connected to the soil moisture, unlike the spruce fluxes. The forest floor was a source of N2O at all plots, while the CH4 flux was connected to the soil moisture (wet plot was a source, other plots were sinks).

Název v anglickém jazyce

SEASONAL DYNAMICS OF N2O AND CH4 FLUXES OF BOREAL TREE STEMS

Popis výsledku anglicky

Boreal forest soils are a natural source of nitrous oxide (N2O) and a sink of methane (CH4). Trees can contribute to ecosystem N2O and CH4 exchange (1) by transporting the gases from soil to the atmosphere, (2) by producing these gases in situ in the plant tissues, (3) by consuming these gases from the atmosphere, or (4) indirectly by altering the soil biochemical or physical conditions. Studies on the N2O and CH4 exchange of mature trees growing in natural field conditions are rare, and the boreal zone trees have not gained much attention. Studies on the seasonality of the tree CH4 and N2O fluxes have been lacking. We measured the stem fluxes of N2O and CH4 from mature pine, spruce and birch trees at three plots with naturally different soil moisture ( soil volumetric water content): Wet (0.81 m 3 m −3 ), moderately wet (0.40 m 3 m −3 ), and dry (0.21 m 3 m −3 ). The fluxes were determined between June 2014 and May 2015, using static chambers and gas chromatographic analyses. There were significant seasonal dynamics in the stem N2O and CH4 exchange. The N2O exchange was clearly connected to the tree physiological activity, while the CH4 flux had only weak relation to physiological activity. Positive correlation between N2O flux and evapotranspiration supports our hypothesis that N2O is transported from soil via the transpiration stream. The CH4 fluxes of birch and pine trees were clearly connected to the soil moisture, unlike the spruce fluxes. The forest floor was a source of N2O at all plots, while the CH4 flux was connected to the soil moisture (wet plot was a source, other plots were sinks).

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10611 - Plant sciences, botany

Projekt

<a href="/cs/project/GJ17-18112Y" target="_blank" >GJ17-18112Y: Toky metanu a oxidu dusného z různých druhů stromů temperátního a boreálního lesa</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

REPORT SERIES IN AEROSOL SCIENCE - Proceedings of The Center of Excellence in Atmospheric Science (CoE ATM)

ISBN

978-952-7276-34-1

ISSN

0784-3496

e-ISSN

—

Počet stran výsledku

3

Strana od-do

423-426

Název nakladatele

Aerosolitutkimusseura ry – Finnish Association for Aerosol Research FAAR

Místo vydání

Helsinki

Místo konání akce

Helsinki

Datum konání akce

25. 11. 2019

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

—