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Biotic, Abiotic, and Management Controls on the Net Ecosystem CO2 Exchange of European Mountain Grassland Ecosystems

Wohlfahrt, Georg; Anderson-Dunn, Margaret; Bahn, Michael; Balzarolo, Manuela; Berninger, Frank; Campbell, Claire; Carrara, Arnaud; Cescatti, Alessandro; Christensen, Torben LU and Dore, Sabina, et al. (2008) In Ecosystems 11(8). p.1338-1351
Abstract
was spring and autumn for the sites characterized by summer droughts (southern sites) and (peak) summer for the Alpine and northern study sites. This general pattern was interrupted by grassland management practices, that is, mowing and grazing, when the variability in NEE explained by PPFD decreased in concert with the amount of aboveground biomass (BMag). Temperature was the abiotic influence factor that explained most of the variability in ecosystem respiration at the Alpine and northern study sites, but not at the southern sites characterized by a pronouncedThe net ecosystem carbon dioxide (CO2) exchange (NEE) of nine European mountain grassland ecosystems was measured during 2002-2004 using the eddy covariance method. Overall, the... (More)
was spring and autumn for the sites characterized by summer droughts (southern sites) and (peak) summer for the Alpine and northern study sites. This general pattern was interrupted by grassland management practices, that is, mowing and grazing, when the variability in NEE explained by PPFD decreased in concert with the amount of aboveground biomass (BMag). Temperature was the abiotic influence factor that explained most of the variability in ecosystem respiration at the Alpine and northern study sites, but not at the southern sites characterized by a pronouncedThe net ecosystem carbon dioxide (CO2) exchange (NEE) of nine European mountain grassland ecosystems was measured during 2002-2004 using the eddy covariance method. Overall, the availability of photosynthetically active radiation (PPFD) was the single most important abiotic influence factor for NEE. Its role changed markedly during the course of the season, PPFD being a better predictor for NEE during periods favorable for CO2 uptake, which summer drought, where soil water availability and the amount of aboveground biomass were more or equally important. The amount of assimilating plant area was the single most important biotic variable determining the maximum ecosystem carbon uptake potential, that is, the NEE at saturating PPFD. Good correspondence, in terms of the magnitude of NEE, was observed with many (semi-) natural grasslands around the world, but not with grasslands sown on fertile soils in lowland locations, which exhibited higher maximum carbon gains at lower respiratory costs. It is concluded that, through triggering rapid changes in the amount and area of the aboveground plant matter, the timing and frequency of land management practices is crucial for the short-term sensitivity of the NEE of the investigated mountain grassland ecosystems to climatic drivers. (Less)
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@article{81cc470d-9007-46ef-b20d-e4487a968563,
  abstract     = {was spring and autumn for the sites characterized by summer droughts (southern sites) and (peak) summer for the Alpine and northern study sites. This general pattern was interrupted by grassland management practices, that is, mowing and grazing, when the variability in NEE explained by PPFD decreased in concert with the amount of aboveground biomass (BMag). Temperature was the abiotic influence factor that explained most of the variability in ecosystem respiration at the Alpine and northern study sites, but not at the southern sites characterized by a pronouncedThe net ecosystem carbon dioxide (CO2) exchange (NEE) of nine European mountain grassland ecosystems was measured during 2002-2004 using the eddy covariance method. Overall, the availability of photosynthetically active radiation (PPFD) was the single most important abiotic influence factor for NEE. Its role changed markedly during the course of the season, PPFD being a better predictor for NEE during periods favorable for CO2 uptake, which summer drought, where soil water availability and the amount of aboveground biomass were more or equally important. The amount of assimilating plant area was the single most important biotic variable determining the maximum ecosystem carbon uptake potential, that is, the NEE at saturating PPFD. Good correspondence, in terms of the magnitude of NEE, was observed with many (semi-) natural grasslands around the world, but not with grasslands sown on fertile soils in lowland locations, which exhibited higher maximum carbon gains at lower respiratory costs. It is concluded that, through triggering rapid changes in the amount and area of the aboveground plant matter, the timing and frequency of land management practices is crucial for the short-term sensitivity of the NEE of the investigated mountain grassland ecosystems to climatic drivers.},
  author       = {Wohlfahrt, Georg and Anderson-Dunn, Margaret and Bahn, Michael and Balzarolo, Manuela and Berninger, Frank and Campbell, Claire and Carrara, Arnaud and Cescatti, Alessandro and Christensen, Torben and Dore, Sabina and Eugster, Werner and Friborg, Thomas and Furger, Markus and Gianelle, Damiano and Gimeno, Cristina and Hargreaves, Ken and Hari, Pertti and Haslwanter, Alois and Johansson, Torbjörn and Marcolla, Barbara and Milford, Celia and Nagy, Zoltan and Nemitz, Eiko and Rogiers, Nele and Sanz, Maria J. and Siegwolf, Rolf T. W. and Susiluoto, Sanna and Sutton, Mark and Tuba, Zoltan and Ugolini, Francesca and Valentini, Riccardo and Zorer, Roberto and Cernusca, Alexander},
  issn         = {1432-9840},
  keyword      = {grazing,index,green area,eddy covariance,ecosystem respiration,biomass,Carbomont,light response,mowing},
  language     = {eng},
  number       = {8},
  pages        = {1338--1351},
  publisher    = {Springer},
  series       = {Ecosystems},
  title        = {Biotic, Abiotic, and Management Controls on the Net Ecosystem CO2 Exchange of European Mountain Grassland Ecosystems},
  url          = {http://dx.doi.org/10.1007/s10021-008-9196-2},
  volume       = {11},
  year         = {2008},
}