Inter- and intra-annual dynamics of photosynthesis differ between forest floor vegetation and tree canopy in a subarctic Scots pine stand

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

We studied the inter- and intra-annual dynamics of the photosynthesis of forest floor vegetation and tree canopy in a subarctic Scots pine stand at the northern timberline in Finland. We tackled the issue using three different approaches: 1) measuring carbon dioxide exchange above and below canopy with the eddy covariance technique, 2) modelling the photosynthesis of the tree canopy based on shoot chamber measurements, and 3) upscaling the forest floor photosynthesis using biomass estimates and available information on the annual cycle of photosynthetic capacity of those species. The studied ecosystem was generally a weak sink of carbon but the sink strength showed notable year-to-year variation. Total ecosystem respiration and photosynthesis indicated a clear temperature limitation for the carbon exchange. However, the increase in photosynthetic production was steeper than the increase in respiration with temperature, indicating that warm temperatures increase the sink strength and do not stimulate the total ecosystem respiration as much in the 4-year window studied. The interannual variation in the photosynthetic production of the forest stand mainly resulted from the forest floor vegetation, whereas the photosynthesis of the tree canopy seemed to be more stable from year to year. Tree canopy photosynthesis increased earlier in the spring, whereas that of the forest floor increased after snowmelt, highlighting that models for photosynthesis in the northern area should also include snow cover in order to accurately estimate the seasonal dynamics of photosynthesis in these forests.
Alkuperäiskielienglanti
LehtiAgricultural and Forest Meteorology
Vuosikerta271
Sivut1-11
Sivumäärä11
ISSN0168-1923
DOI - pysyväislinkit
TilaJulkaistu - 15 kesäkuuta 2019
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 4112 Metsätiede
  • 1171 Geotieteet

Lainaa tätä

@article{bf57278afa674054ac676fea25a7ee45,
title = "Inter- and intra-annual dynamics of photosynthesis differ between forest floor vegetation and tree canopy in a subarctic Scots pine stand",
abstract = "We studied the inter- and intra-annual dynamics of the photosynthesis of forest floor vegetation and tree canopy in a subarctic Scots pine stand at the northern timberline in Finland. We tackled the issue using three different approaches: 1) measuring carbon dioxide exchange above and below canopy with the eddy covariance technique, 2) modelling the photosynthesis of the tree canopy based on shoot chamber measurements, and 3) upscaling the forest floor photosynthesis using biomass estimates and available information on the annual cycle of photosynthetic capacity of those species. The studied ecosystem was generally a weak sink of carbon but the sink strength showed notable year-to-year variation. Total ecosystem respiration and photosynthesis indicated a clear temperature limitation for the carbon exchange. However, the increase in photosynthetic production was steeper than the increase in respiration with temperature, indicating that warm temperatures increase the sink strength and do not stimulate the total ecosystem respiration as much in the 4-year window studied. The interannual variation in the photosynthetic production of the forest stand mainly resulted from the forest floor vegetation, whereas the photosynthesis of the tree canopy seemed to be more stable from year to year. Tree canopy photosynthesis increased earlier in the spring, whereas that of the forest floor increased after snowmelt, highlighting that models for photosynthesis in the northern area should also include snow cover in order to accurately estimate the seasonal dynamics of photosynthesis in these forests.",
keywords = "4112 Forestry, 1171 Geosciences, Eddy covariance, Net ecosystem exchange, Sink limitation, CHAMBER MEASUREMENTS, LATENT-HEAT FLUXES, BOREAL FOREST, CO2 EXCHANGE, NORWAY SPRUCE, GROUND VEGETATION, BLACK SPRUCE FOREST, EDDY COVARIANCE, NITROGEN-USE EFFICIENCY, CARBON-DIOXIDE",
author = "Liisa Kulmala and Jukka Pumpanen and Pasi Kolari and Sigrid Dengel and Frank Berninger and Kajar K{\"o}ster and Laura Matkala and Anni Vanhatalo and Timo Vesala and Jaana B{\"a}ck",
year = "2019",
month = "6",
day = "15",
doi = "10.1016/j.agrformet.2019.02.029",
language = "English",
volume = "271",
pages = "1--11",
journal = "Agricultural and Forest Meteorology",
issn = "0168-1923",
publisher = "Elsevier Scientific Publ. Co",

}

TY - JOUR

T1 - Inter- and intra-annual dynamics of photosynthesis differ between forest floor vegetation and tree canopy in a subarctic Scots pine stand

AU - Kulmala, Liisa

AU - Pumpanen, Jukka

AU - Kolari, Pasi

AU - Dengel, Sigrid

AU - Berninger, Frank

AU - Köster, Kajar

AU - Matkala, Laura

AU - Vanhatalo, Anni

AU - Vesala, Timo

AU - Bäck, Jaana

PY - 2019/6/15

Y1 - 2019/6/15

N2 - We studied the inter- and intra-annual dynamics of the photosynthesis of forest floor vegetation and tree canopy in a subarctic Scots pine stand at the northern timberline in Finland. We tackled the issue using three different approaches: 1) measuring carbon dioxide exchange above and below canopy with the eddy covariance technique, 2) modelling the photosynthesis of the tree canopy based on shoot chamber measurements, and 3) upscaling the forest floor photosynthesis using biomass estimates and available information on the annual cycle of photosynthetic capacity of those species. The studied ecosystem was generally a weak sink of carbon but the sink strength showed notable year-to-year variation. Total ecosystem respiration and photosynthesis indicated a clear temperature limitation for the carbon exchange. However, the increase in photosynthetic production was steeper than the increase in respiration with temperature, indicating that warm temperatures increase the sink strength and do not stimulate the total ecosystem respiration as much in the 4-year window studied. The interannual variation in the photosynthetic production of the forest stand mainly resulted from the forest floor vegetation, whereas the photosynthesis of the tree canopy seemed to be more stable from year to year. Tree canopy photosynthesis increased earlier in the spring, whereas that of the forest floor increased after snowmelt, highlighting that models for photosynthesis in the northern area should also include snow cover in order to accurately estimate the seasonal dynamics of photosynthesis in these forests.

AB - We studied the inter- and intra-annual dynamics of the photosynthesis of forest floor vegetation and tree canopy in a subarctic Scots pine stand at the northern timberline in Finland. We tackled the issue using three different approaches: 1) measuring carbon dioxide exchange above and below canopy with the eddy covariance technique, 2) modelling the photosynthesis of the tree canopy based on shoot chamber measurements, and 3) upscaling the forest floor photosynthesis using biomass estimates and available information on the annual cycle of photosynthetic capacity of those species. The studied ecosystem was generally a weak sink of carbon but the sink strength showed notable year-to-year variation. Total ecosystem respiration and photosynthesis indicated a clear temperature limitation for the carbon exchange. However, the increase in photosynthetic production was steeper than the increase in respiration with temperature, indicating that warm temperatures increase the sink strength and do not stimulate the total ecosystem respiration as much in the 4-year window studied. The interannual variation in the photosynthetic production of the forest stand mainly resulted from the forest floor vegetation, whereas the photosynthesis of the tree canopy seemed to be more stable from year to year. Tree canopy photosynthesis increased earlier in the spring, whereas that of the forest floor increased after snowmelt, highlighting that models for photosynthesis in the northern area should also include snow cover in order to accurately estimate the seasonal dynamics of photosynthesis in these forests.

KW - 4112 Forestry

KW - 1171 Geosciences

KW - Eddy covariance

KW - Net ecosystem exchange

KW - Sink limitation

KW - CHAMBER MEASUREMENTS

KW - LATENT-HEAT FLUXES

KW - BOREAL FOREST

KW - CO2 EXCHANGE

KW - NORWAY SPRUCE

KW - GROUND VEGETATION

KW - BLACK SPRUCE FOREST

KW - EDDY COVARIANCE

KW - NITROGEN-USE EFFICIENCY

KW - CARBON-DIOXIDE

U2 - 10.1016/j.agrformet.2019.02.029

DO - 10.1016/j.agrformet.2019.02.029

M3 - Article

VL - 271

SP - 1

EP - 11

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

SN - 0168-1923

ER -