The interaction of biotic and abiotic factors at multiple spatial scales affects the variability of CO2 fluxes in polar environments

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F16%3A00469830" target="_blank" >RIV/86652079:_____/16:00469830 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/s00300-015-1883-9" target="_blank" >http://dx.doi.org/10.1007/s00300-015-1883-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00300-015-1883-9" target="_blank" >10.1007/s00300-015-1883-9</a>

Result language

angličtina

Original language name

The interaction of biotic and abiotic factors at multiple spatial scales affects the variability of CO2 fluxes in polar environments

Original language description

Climate change may turn Arctic biomes from carbon sinks into sources and vice versa, depending on the balance between gross ecosystem photosynthesis, ecosystem respiration (ER) and the resulting net ecosystem exchange (NEE). Photosynthetic capacity is species specific, and thus, it is important to quantify the contribution of different target plant species to NEE and ER. At Ny Alesund (Svalbard archipelago, Norway), we selected different Arctic tundra plant species and measured CO2 fluxes at plot scale and photosynthetic capacity at leaf scale. We aimed to analyze trends in CO2 fluxes during the transition seasons (beginning vs. end of the growing season) and assess which abiotic (soil temperature, soil moisture, PAR) and biotic (plot type, phenology, LAI, photosynthetic capacity) factors influenced CO2 emissions. NEE and ER differed between vegetation communities. All communities acted as CO2 sources, with higher source strength at the beginning than at the end of the growing season. The key factors affecting NEE were soil temperature, LAI and species-specific photosynthetic capacities, coupled with phenology. ER was always influenced by soil temperature. Measurements of photosynthetic capacity indicated different responses among species to light intensity, as well as suggesting possible gains in response to future increases in atmospheric CO2 concentrations. Species- specific adaptation to low temperatures could trigger significant feedbacks in a climate change context. Our data highlight the need to quantify the role of dominant species in the C cycle (sinks or sources), as changes of vegetation composition or species phenology in response to climate change may have great impact on the regional CO2 balance.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

EH - Ecology - communities

OECD FORD branch

—

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Polar Biology

ISSN

0722-4060

e-ISSN

—

Volume of the periodical

39

Issue of the periodical within the volume

9

Country of publishing house

DE - GERMANY

Number of pages

16

Pages from-to

1581-1596

UT code for WoS article

000384551500007

EID of the result in the Scopus database

2-s2.0-84952670394