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Submitted on 6 Jun 2020
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A model of C and N cycling where the plant-soil
synchrony functions as a symphony
Nazia Perveen, Sébastien Barot, Gaël Alvarez, Sébastien Fontaine
To cite this version:
Nazia Perveen, Sébastien Barot, Gaël Alvarez, Sébastien Fontaine. A model of C and N cycling where the plant-soil synchrony functions as a symphony. Eurosoil 2012 - Soil Science For The Benefit of Mankind and Environment, Jul 2012, Bari, Italy. 1 p., 2012. �hal-02805734�
Introduction & Objectives
A model of C and N cycling where the plant
A model of C and N cycling where the plant--soil synchrony soil synchrony functions as a symphony
functions as a symphony
Nazia PERVEEN, Sébastien BAROT, Gaël ALVAREZ and Sébastien FONTAINE
n°5, Chemin de Beaulieu , INRA-Clermont Ferrand, France, Author Correspondance: nazia.perveen@clermont.inra.fr
Integration of priming effect (PE) in agroecosystem modelscould qualitatively change predictions of global change effects on C storage and plant production.
Some models were built to simulate PE. However, PE has never been inserted in plant-soil model to analyze its consequences on ecosystem properties.
Our objective wasto explore the consequences of PE integration in plant-soil modelon:
C storage Nutrient cycle Plant-soil interaction Cp Np ΦPh Plant Φr mpCp βmpCp Cs SOM FOM Cds Nds SOM-miners SOM-storers CO2 mineral N Ns= αCs Nds= αCds ACds αACds rCds sCds αsCds sCdf αsCdf Φd ßΦ d ΦIMs Φ Φi Φo epCp βepCp Φup Np= βCp Ns Approach
Integration of plant in the model of Fontaine and Barot (2005) Mathematical analysis of the model at equilibrium followed
by numerical simulations
Model equilibrium for closed ecosystem
Results M o d e l C o m p a rt m e n ts SOM Mineral N SOM-miners SOM-storers FOM Plant
Bank mechanism : Accumulation or loss of SOM depends on ecosystem
nutrient balance. S O M S O M
Ecosystem response to:
a) N input b) N output
Figure : Modified model of Fontaine and Barot (2005)
Mineral N 1 a) Mineral N 1 b) SOM m in e ra l N m in e ra l N Nf= ßCf Ndf= αCdf Cf Nf FOM Cdf Ndf SOM-storers CO2 Φf ßΦf rCdf αsCdf ΦIMf o Conclusion
In permanent vegetation cover,
synchrony between plant nutrient demand and soil N offer which leads to :
Optimize plant production (maximum exploitation of PAR)
Minimize nutrient loss by leaching SOM building (C and N storage)
Perspectives
Development of new agricultural practices based on the bank mechanism
Funding : Higher Education (HEC) Commission Islamabad, Pakistan and EFPA department of INRA, Site de Crouel, 63039 Clermont Ferrand, FRANCE
Plant-microbial coexistence (persistence of all compartments) TIME TIME M ic ro b ia l b io m a s s TIME SOM-storers SOM-miners TIME M ic ro b ia l b io m a s s SOM-storers SOM-miners
N output SOM loss N input SOM accumulation
2 a) 2 b)
Bibliography : Fontaine, S and Barot, S (2005), Ecology Letters, 8:1075-1087
TIME SOM
