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Forests 2017, 8(6), 220; doi:10.3390/f8060220

The Role of Respiration in Estimation of Net Carbon Cycle: Coupling Soil Carbon Dynamics and Canopy Turnover in a Novel Version of 3D-CMCC Forest Ecosystem Model

1
School of Natural Resources and Environment, 103 Black Hall, University of Florida, Gainesville, FL 32611, USA
2
Foundation Euro-Mediterranean Center on Climate Change—Impacts on Agriculture, Forest and Ecosystem Services (IAFES), 01100 Viterbo, VT, Italy
3
Department for Innovation in Biological, Agro-Food and Forest Systems (DIBAF), University of Tuscia, 01100 Viterbo, VT, Italy
4
Far Eastern Federal University (FEFU), Ajax St., Vladivostok, 690920 Russky Island, Russia
5
School of Agricultural, Forestry, Food and Environmental Sciences (SAFE), University of Basilicata, 85100 Potenza, Italy
6
CNR-ISAFOM National Research Council of Italy, Institute for Agriculture and Forestry Systems in the Mediterranean, 87036 Rende, CS, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Robert Jandl and Mirco Rodeghiero
Received: 16 March 2017 / Revised: 14 June 2017 / Accepted: 15 June 2017 / Published: 21 June 2017
(This article belongs to the Special Issue Forest Soil Respiration under Climate Changing)
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Abstract

Understanding the dynamics of organic carbon mineralization is fundamental in forecasting biosphere to atmosphere net carbon ecosystem exchange (NEE). With this perspective, we developed 3D-CMCC-PSM, a new version of the hybrid process based model 3D‐CMCC FEM where also heterotrophic respiration (Rh) is explicitly simulated. The aim was to quantify NEE as a forward problem, by subtracting ecosystem respiration (Reco) to gross primary productivity (GPP). To do so, we developed a simplification of the soil carbon dynamics routine proposed in the DNDC (DeNitrification-DeComposition) computer simulation model. The method calculates decomposition as a function of soil moisture, temperature, state of the organic compartments, and relative abundance of microbial pools. Given the pulse dynamics of soil respiration, we introduced modifications in some of the principal constitutive relations involved in phenology and littering sub-routines. We quantified the model structure-related uncertainty in NEE, by running our training simulations over 1000 random parameter-sets extracted from parameter distributions expected from literature. 3D-CMCC-PSM predictability was tested on independent time series for 6 Fluxnet sites. The model resulted in daily and monthly estimations highly consistent with the observed time series. It showed lower predictability in Mediterranean ecosystems, suggesting that it may need further improvements in addressing evapotranspiration and water dynamics. View Full-Text
Keywords: forest ecosystem; Fluxnet; soil respiration; net ecosystem exchange; phenology forest ecosystem; Fluxnet; soil respiration; net ecosystem exchange; phenology
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Marconi, S.; Chiti, T.; Nolè, A.; Valentini, R.; Collalti, A. The Role of Respiration in Estimation of Net Carbon Cycle: Coupling Soil Carbon Dynamics and Canopy Turnover in a Novel Version of 3D-CMCC Forest Ecosystem Model. Forests 2017, 8, 220.

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