A process-based model of nitrogen cycling in forest plantations Part I. Structure, calibration and analysis of the decomposition model

作者: M. Corbeels , R.E. McMurtrie , D.A. Pepper , A.M. O’Connell

DOI: 10.1016/J.ECOLMODEL.2004.09.005

关键词: Soil classificationSoil organic matterForest ecologyMineralization (soil science)Plant litterEcologyNitrogen cycleEcosystem modelCyclingEnvironmental scienceEnvironmental chemistry

摘要: Abstract We present a new decomposition model of C and N cycling in forest ecosystems that simulates mineralisation from decomposing tree litter. It incorporates mechanistic representation the role soil organisms mineralisation-immobilisation turnover process during decomposition. first calibrate using data 14C-labelled cellulose lignin legume material then test it mass loss Eucalyptus globulus residues. The has been linked to plant production submodel G’DAY ecosystem model, which previously used CENTURY for simulating cycling. key differences between this previous one, based on are: (1) growth microbial biomass is drives mineralisation-immobilisation, succession simulated; (2) litter can be N-limited, depending inorganic availability relative requirements growth; (3) ‘quality’ leaf fine root expressed terms biochemically measurable fractions; (4) N:C ratio active function quality availability; (5) ratios organic matter (SOM) pools are not prescribed but instead simulated output variables defined by characteristics availability. With these modifications able provide reasonable estimates both E. branch harvest residues litterbag experiments. A sensitivity analysis selected parameters indicates regulating stabilisation N, as well those describing incorporation Young-SOM (biochemical immobilisation N) particularly critical long-term applications model. parameter identifiability demonstrates short-term highly sensitive three identifiable data.

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