Record details

Title
    Modelling soil nitrogen: The MAGIC model with nitrogen retention linked to carbon turnover using decomposer dynamics
Author
    Cosby, Bernard J.
    Evans, Christopher
    Hruška, Jakub
    Kopáček, Jiří
    Krám, Pavel
    Moldan, Filip
    Oulehle, Filip
    Wright, Richard
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Environmental Pollution
Vol./nr.
    Roč. 165, č. June
Pages
    9
Year
    2012
Thesaurus term
    Nitrogen, Saturation, Leaching, Acidification, Norway spruce, Bohemian Forest, Slavkov Forest, Ore Mountains, Erzgebirge
Keyword
    Carbon
    Decomposer
    Dynamics
    Linked
    MAGIC
    Model
    Modelling
    Nitrogen
    Retention
    Soil
    Turnover
    Using
Abstract (in english)
   We present a new formulation of the acidification model MAGIC that uses decomposer dynamics to link nitrogen (N) cycling to carbon (C) turnover in soils. The new model is evaluated by application to 15-30 years of water chemistry data at three coniferous-forested sites in the Czech Republic where deposition of sulphur (S) and N have decreased by >80% and 40%, respectively. Sulphate concentrations inwaters have declined commensurately with S deposition, but nitrate concentrations have shown much larger decreases relative to N deposition. This behaviour is inconsistent with most conceptual models of N saturation, and with earlier versions of MAGIC which assume N retention to be a first-order function of N deposition and/or controlled by the soil C/N ratio. In comparison with earlier versions, the new formulation more correctly simulates observed short-term changes in nitrate leaching, as well as long-term retention of N in soils. The model suggests that, despite recent deposition reducti
   ons and recovery, progressive N saturation will lead to increased future nitrate leaching, ecosystem eutrophication and re-acidification.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014