Forest floor vegetation plays an important role in photosynthetic production of boreal forests

Pasi Kolari, Jukka Pumpanen, Liisa Kulmala, Hannu Ilvesniemi, Eero Nikinmaa, Tiia Grönholm, Pertti Hari

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

We estimated gross photosynthetic production (GPP) of the forest floor vegetation in a 40-year-old Scots pine stand in southern Finland with three different methods: measurements of CO2 exchange of single leaves of field and ground layer species, measurement campaigns of forest floor net CO2 efflux at different irradiances with a manually operated soil chamber, and continuous measurements of forest floor net CO2 efflux with an automatic transparent chamber system. We upscaled the measured light response curves from the manual soil chambers using the biomass distribution of the forest floor species, a modelled seasonal pattern of photosynthetic capacity and a model of light extinction down the canopy. Leaf gas exchange of net CO2 efflux with the manual chamber indicated saturation of photosynthesis at relatively low (50-400 mu mol m(-2) s(-1)) light levels. Leaf and patch level measurements gave similar rates of photosynthetic CO2 fixation per unit leaf biomass suggesting that reduction in photosynthetic production due to within-patch shading was small. Upscaling of photosynthetic production to the stand level and continuous measurements with the automatic soil chambers indicated that momentary photosynthetic production by the forest floor vegetation in the summer was typically about 2 mu mol m(-2) (ground) s(-1). Cumulative upscaled GPP over the period of no snow (from 20 April to 20 November) in year 2003 was 131 g C m(-2). Continuous measurements with the automatic soil chamber system were in line with the upscaling, the cumulative GPP being 83 g C m(-2) and the seasonal pattern of photosynthetic rate similar to that of the upscaled photosynthesis. (c) 2005 Elsevier B.V. All rights reserved.
Alkuperäiskielienglanti
LehtiForest Ecology and Management
Vuosikerta221
Numero1-3
Sivut241-248
Sivumäärä8
ISSN0378-1127
DOI - pysyväislinkit
TilaJulkaistu - 2006
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Lainaa tätä

@article{c7a3af676be74cbaa55482fba598e1ad,
title = "Forest floor vegetation plays an important role in photosynthetic production of boreal forests",
abstract = "We estimated gross photosynthetic production (GPP) of the forest floor vegetation in a 40-year-old Scots pine stand in southern Finland with three different methods: measurements of CO2 exchange of single leaves of field and ground layer species, measurement campaigns of forest floor net CO2 efflux at different irradiances with a manually operated soil chamber, and continuous measurements of forest floor net CO2 efflux with an automatic transparent chamber system. We upscaled the measured light response curves from the manual soil chambers using the biomass distribution of the forest floor species, a modelled seasonal pattern of photosynthetic capacity and a model of light extinction down the canopy. Leaf gas exchange of net CO2 efflux with the manual chamber indicated saturation of photosynthesis at relatively low (50-400 mu mol m(-2) s(-1)) light levels. Leaf and patch level measurements gave similar rates of photosynthetic CO2 fixation per unit leaf biomass suggesting that reduction in photosynthetic production due to within-patch shading was small. Upscaling of photosynthetic production to the stand level and continuous measurements with the automatic soil chambers indicated that momentary photosynthetic production by the forest floor vegetation in the summer was typically about 2 mu mol m(-2) (ground) s(-1). Cumulative upscaled GPP over the period of no snow (from 20 April to 20 November) in year 2003 was 131 g C m(-2). Continuous measurements with the automatic soil chamber system were in line with the upscaling, the cumulative GPP being 83 g C m(-2) and the seasonal pattern of photosynthetic rate similar to that of the upscaled photosynthesis. (c) 2005 Elsevier B.V. All rights reserved.",
author = "Pasi Kolari and Jukka Pumpanen and Liisa Kulmala and Hannu Ilvesniemi and Eero Nikinmaa and Tiia Gr{\"o}nholm and Pertti Hari",
year = "2006",
doi = "10.1016/j.foreco.2005.10.021",
language = "English",
volume = "221",
pages = "241--248",
journal = "Forest Ecology and Management",
issn = "0378-1127",
publisher = "Elsevier Scientific Publ. Co",
number = "1-3",

}

Forest floor vegetation plays an important role in photosynthetic production of boreal forests. / Kolari, Pasi; Pumpanen, Jukka; Kulmala, Liisa; Ilvesniemi, Hannu; Nikinmaa, Eero; Grönholm, Tiia; Hari, Pertti.

julkaisussa: Forest Ecology and Management, Vuosikerta 221, Nro 1-3, 2006, s. 241-248.

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Forest floor vegetation plays an important role in photosynthetic production of boreal forests

AU - Kolari, Pasi

AU - Pumpanen, Jukka

AU - Kulmala, Liisa

AU - Ilvesniemi, Hannu

AU - Nikinmaa, Eero

AU - Grönholm, Tiia

AU - Hari, Pertti

PY - 2006

Y1 - 2006

N2 - We estimated gross photosynthetic production (GPP) of the forest floor vegetation in a 40-year-old Scots pine stand in southern Finland with three different methods: measurements of CO2 exchange of single leaves of field and ground layer species, measurement campaigns of forest floor net CO2 efflux at different irradiances with a manually operated soil chamber, and continuous measurements of forest floor net CO2 efflux with an automatic transparent chamber system. We upscaled the measured light response curves from the manual soil chambers using the biomass distribution of the forest floor species, a modelled seasonal pattern of photosynthetic capacity and a model of light extinction down the canopy. Leaf gas exchange of net CO2 efflux with the manual chamber indicated saturation of photosynthesis at relatively low (50-400 mu mol m(-2) s(-1)) light levels. Leaf and patch level measurements gave similar rates of photosynthetic CO2 fixation per unit leaf biomass suggesting that reduction in photosynthetic production due to within-patch shading was small. Upscaling of photosynthetic production to the stand level and continuous measurements with the automatic soil chambers indicated that momentary photosynthetic production by the forest floor vegetation in the summer was typically about 2 mu mol m(-2) (ground) s(-1). Cumulative upscaled GPP over the period of no snow (from 20 April to 20 November) in year 2003 was 131 g C m(-2). Continuous measurements with the automatic soil chamber system were in line with the upscaling, the cumulative GPP being 83 g C m(-2) and the seasonal pattern of photosynthetic rate similar to that of the upscaled photosynthesis. (c) 2005 Elsevier B.V. All rights reserved.

AB - We estimated gross photosynthetic production (GPP) of the forest floor vegetation in a 40-year-old Scots pine stand in southern Finland with three different methods: measurements of CO2 exchange of single leaves of field and ground layer species, measurement campaigns of forest floor net CO2 efflux at different irradiances with a manually operated soil chamber, and continuous measurements of forest floor net CO2 efflux with an automatic transparent chamber system. We upscaled the measured light response curves from the manual soil chambers using the biomass distribution of the forest floor species, a modelled seasonal pattern of photosynthetic capacity and a model of light extinction down the canopy. Leaf gas exchange of net CO2 efflux with the manual chamber indicated saturation of photosynthesis at relatively low (50-400 mu mol m(-2) s(-1)) light levels. Leaf and patch level measurements gave similar rates of photosynthetic CO2 fixation per unit leaf biomass suggesting that reduction in photosynthetic production due to within-patch shading was small. Upscaling of photosynthetic production to the stand level and continuous measurements with the automatic soil chambers indicated that momentary photosynthetic production by the forest floor vegetation in the summer was typically about 2 mu mol m(-2) (ground) s(-1). Cumulative upscaled GPP over the period of no snow (from 20 April to 20 November) in year 2003 was 131 g C m(-2). Continuous measurements with the automatic soil chamber system were in line with the upscaling, the cumulative GPP being 83 g C m(-2) and the seasonal pattern of photosynthetic rate similar to that of the upscaled photosynthesis. (c) 2005 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.foreco.2005.10.021

DO - 10.1016/j.foreco.2005.10.021

M3 - Article

VL - 221

SP - 241

EP - 248

JO - Forest Ecology and Management

JF - Forest Ecology and Management

SN - 0378-1127

IS - 1-3

ER -