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Sökning: WFRF:(Klemedtsson Leif 1953) > (2015-2019) > Factors controlling...

  • He, Hongxing,1987Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences (författare)

Factors controlling Nitrous Oxide emission from a spruce forest ecosystem on drained organic soil, derived using the CoupModel

  • Artikel/kapitelEngelska2016

Förlag, utgivningsår, omfång ...

  • Elsevier,2016
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:kth-180921
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180921URI
  • https://doi.org/10.1016/j.ecolmodel.2015.10.030DOI
  • https://gup.ub.gu.se/publication/227404URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • QC 20160126
  • High Nitrous Oxide (N2O) emissions have been identified in hemiboreal forests in association with draining organic soils. However, the specific controlling factors that regulate the emissions remain unclear. To examine the importance of different factors affecting N2O emissions in a spruce forest on drained organic soil, a process-based model, CoupModel, was calibrated using the generalized likelihood uncertainty estimation (GLUE) method. The calibration also aims to estimate parameter density distributions, the covariance matrix of estimated parameters and the correlation between parameters and variables information, useful when applying the model on other peat soil sites and for further model improvements. The calibrated model reproduced most of the high resolution data (total net radiation, soil temperature, groundwater level, net ecosystem exchange, etc.) very well, as well as cumulative measured N2O emissions (simulated 8.7±1.1kgN2Oha-1year-1 (n=97); measured 8.7±2.7kgN2Oha-1year-1 (n=6)), but did not capture every measured peak. Parameter uncertainties were reduced after calibration, in which 16 out of 20 parameters changed from uniform distributions into normal distributions or log normal distributions. Four parameters describing bypass water flow, oxygen diffusion and soil freezing changed significantly after calibration. Inter-connections and correlations between many calibrated parameters and variables reflect the complex and interrelated nature of pedosphere, biosphere and atmosphere interactions. This also highlights the need to calibrate a number of parameters simultaneously. Model sensitivity analysis indicated that N2O emissions during growing seasons are controlled by competition between plants and microbes for nitrogen, while during the winter season snow melt periods are important. Our results also indicate that N2O is mainly produced in the capillary fringe close to the groundwater table by denitrification in the anaerobic zone. We conclude that, in afforested drained peatlands, the plants and groundwater level have important influences on soil N availability, ultimately controlling N2O emissions.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Jansson, Per-ErikKTH,Mark- och vattenteknik(Swepub:kth)u1rtodsk (författare)
  • Svensson, MagnusKTH,Mark- och vattenteknik(Swepub:kth)u1byeh9y (författare)
  • Meyer, AstridGothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xmeyas (författare)
  • Klemedtsson, Leif,1953Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences(Swepub:gu)xklele (författare)
  • Kasimir, Åsa,1956Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences(Swepub:gu)xkleas (författare)
  • Göteborgs universitetInstitutionen för geovetenskaper (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Ecological Modelling: Elsevier321, s. 46-630304-38001872-7026

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