Effects of grazing on the vegetation structure and carbon dioxide exchange of a Fennoscandian fell ecosystem

Sanna Susiluoto, Terhi Rasilo, Jukka Pumpanen, Frank Berninger

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

We used the chamber method to measure growing season ecosystem carbon exchange and ecosystem respiration in Finnish 2 alpine tundra. The average ecosystem respiration in the sites was 0.8-0.9 mu mol m(-2) s(-1) and the daytime net ecosystem exchange (NEE) was around -0.4 to -0.5 mu mol m(-2) s(-1). There were no detectable differences in cuvette-based net ecosystem exchange or ecosystem respiration between grazed fell areas and long term reindeer exclosure. Further analysis showed that net carbon exchange as well as ecosystem respiration were significantly correlated with the dwarf shrub cover, while the proportion of lichen cover (Cladina sp.) was not correlated with ecosystem carbon exchange. Clipping experiments showed that about half of the measured ecosystem respiration was heterotrophic. Plots that had been protected from reindeer grazing had almost two times higher above-ground plant biomass than grazed plots. The reason for this was 86% lower lichen biomass on the grazed side of the fell, while the biomass of Ericaceous dwarf shrubs did not differ even though there were changes in species composition. Surprisingly, the proportion of bare ground did not differ due to grazing pressure, but the reduction in biomass lead to a less stratified vegetation cover.
Alkuperäiskielienglanti
LehtiArctic, Antarctic, and Alpine Research
Vuosikerta40
Numero2
Sivut422-431
Sivumäärä10
ISSN1523-0430
DOI - pysyväislinkit
TilaJulkaistu - 2008
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 411 Maatalous ja metsätieteet

Lainaa tätä

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title = "Effects of grazing on the vegetation structure and carbon dioxide exchange of a Fennoscandian fell ecosystem",
abstract = "We used the chamber method to measure growing season ecosystem carbon exchange and ecosystem respiration in Finnish 2 alpine tundra. The average ecosystem respiration in the sites was 0.8-0.9 mu mol m(-2) s(-1) and the daytime net ecosystem exchange (NEE) was around -0.4 to -0.5 mu mol m(-2) s(-1). There were no detectable differences in cuvette-based net ecosystem exchange or ecosystem respiration between grazed fell areas and long term reindeer exclosure. Further analysis showed that net carbon exchange as well as ecosystem respiration were significantly correlated with the dwarf shrub cover, while the proportion of lichen cover (Cladina sp.) was not correlated with ecosystem carbon exchange. Clipping experiments showed that about half of the measured ecosystem respiration was heterotrophic. Plots that had been protected from reindeer grazing had almost two times higher above-ground plant biomass than grazed plots. The reason for this was 86{\%} lower lichen biomass on the grazed side of the fell, while the biomass of Ericaceous dwarf shrubs did not differ even though there were changes in species composition. Surprisingly, the proportion of bare ground did not differ due to grazing pressure, but the reduction in biomass lead to a less stratified vegetation cover.",
keywords = "411 Agriculture and forestry",
author = "Sanna Susiluoto and Terhi Rasilo and Jukka Pumpanen and Frank Berninger",
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pages = "422--431",
journal = "Arctic, Antarctic, and Alpine Research",
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number = "2",

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Effects of grazing on the vegetation structure and carbon dioxide exchange of a Fennoscandian fell ecosystem. / Susiluoto, Sanna; Rasilo, Terhi; Pumpanen, Jukka; Berninger, Frank.

julkaisussa: Arctic, Antarctic, and Alpine Research, Vuosikerta 40, Nro 2, 2008, s. 422-431.

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Effects of grazing on the vegetation structure and carbon dioxide exchange of a Fennoscandian fell ecosystem

AU - Susiluoto, Sanna

AU - Rasilo, Terhi

AU - Pumpanen, Jukka

AU - Berninger, Frank

PY - 2008

Y1 - 2008

N2 - We used the chamber method to measure growing season ecosystem carbon exchange and ecosystem respiration in Finnish 2 alpine tundra. The average ecosystem respiration in the sites was 0.8-0.9 mu mol m(-2) s(-1) and the daytime net ecosystem exchange (NEE) was around -0.4 to -0.5 mu mol m(-2) s(-1). There were no detectable differences in cuvette-based net ecosystem exchange or ecosystem respiration between grazed fell areas and long term reindeer exclosure. Further analysis showed that net carbon exchange as well as ecosystem respiration were significantly correlated with the dwarf shrub cover, while the proportion of lichen cover (Cladina sp.) was not correlated with ecosystem carbon exchange. Clipping experiments showed that about half of the measured ecosystem respiration was heterotrophic. Plots that had been protected from reindeer grazing had almost two times higher above-ground plant biomass than grazed plots. The reason for this was 86% lower lichen biomass on the grazed side of the fell, while the biomass of Ericaceous dwarf shrubs did not differ even though there were changes in species composition. Surprisingly, the proportion of bare ground did not differ due to grazing pressure, but the reduction in biomass lead to a less stratified vegetation cover.

AB - We used the chamber method to measure growing season ecosystem carbon exchange and ecosystem respiration in Finnish 2 alpine tundra. The average ecosystem respiration in the sites was 0.8-0.9 mu mol m(-2) s(-1) and the daytime net ecosystem exchange (NEE) was around -0.4 to -0.5 mu mol m(-2) s(-1). There were no detectable differences in cuvette-based net ecosystem exchange or ecosystem respiration between grazed fell areas and long term reindeer exclosure. Further analysis showed that net carbon exchange as well as ecosystem respiration were significantly correlated with the dwarf shrub cover, while the proportion of lichen cover (Cladina sp.) was not correlated with ecosystem carbon exchange. Clipping experiments showed that about half of the measured ecosystem respiration was heterotrophic. Plots that had been protected from reindeer grazing had almost two times higher above-ground plant biomass than grazed plots. The reason for this was 86% lower lichen biomass on the grazed side of the fell, while the biomass of Ericaceous dwarf shrubs did not differ even though there were changes in species composition. Surprisingly, the proportion of bare ground did not differ due to grazing pressure, but the reduction in biomass lead to a less stratified vegetation cover.

KW - 411 Agriculture and forestry

U2 - 10.1657/1523-0430(07-035)[SUSILUOTO]2.0.CO;2"

DO - 10.1657/1523-0430(07-035)[SUSILUOTO]2.0.CO;2"

M3 - Article

VL - 40

SP - 422

EP - 431

JO - Arctic, Antarctic, and Alpine Research

JF - Arctic, Antarctic, and Alpine Research

SN - 1523-0430

IS - 2

ER -