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Effect of nutrients availability and crop management on priming effect and soil C mineralization
Bassem Dimassi, Sébastien Fontaine, Nazia Perveen, Sandrine Revaillot, Jean-Pierre Cohan, Bruno Mary
To cite this version:
Effect of nutrients availability and crop
management on priming effect and soil C
mineralization
INRA US-InfoSol
2163 Avenue de la pomme de pin, 45075 Ardon http://www.val-de-loire.inra.fr
a*INRA, UPR AgroImpact, Laon, Currently INRA InfoSol Orléans, France *Contact: bassem.dimassi@orleans.inra.fr bINRA, UREP, Clermont-Ferrand, France
cARVALIS-Institut du Végétal, Station Expérimentale, Boigneville, France
Bassem Dimassia*, Sébastien Fontaineb, Nazia Perveenb, Sandrine Revaillotb, Jean-Pierre Cohanc, Bruno Mary a
INTRODUCTION
METHODS
RESULTS and DISCUSSION
Conclusion
Arable soils, through soil organic matter (SOM) mineralization, constitute a major source of uncertainties in predicting fluxes and changes in atmospheric CO2 concentration. Reducing this uncertainty requires a better understanding of biogeochemical process. Among these process, the so-called priming effect (PE) was shown to affect considerably the ecosystem C fluxes. Agricultural practices (e.g. tillage) exert strong control on SOM turnover and PE. In this incubation study, we quantified C mineralization and PE in soils sampled from long-term (40 years) tillage experiment (Boigneville, Northern France).
• Two factors: tillage and nutrients availability and two layers (0-5 and 15-20 cm) with two treatments no till (NT)
and full inversion tillage (FIT) (fig.1).
• Examination of SOC mineralization during 262 days using linear mixed effect model (Eq. 1) with nlme package,
and the PE with the linear-plateau model (Eq. 2). Eq. (1) and (2) were fitted with the nls package.
• Basal cumulative C mineralization in the control soil ranged from 363 to1490 mg kg-1 soil and was strongly
correlated with SOC concentration (fig. 2).
• Specific mineralization rates were 44.8 and 68.8 g kg-1 SOC in the 0-5 cm layer for the FIT and NT,
respectively, and were strongly linked with the POM content (r = 0.99***).
• PE is mainly controlled by nutrient availability but not tillage, in spite of strong tillage-induced changes in SOC concentrations and microbial biomass. • PE depend on C addition rate, thus tillage is expected to affect in situ PE through the ratio of fresh carbon to nutrient concentration along the soil profile.
ACKNOWLEDGMENTS
This study received a financial support from Arvalis-Institut du Végétal, National Agency of Research and Technology and AgroImpact and InfoSol units, INRA. We would like to thank V. Maire, C. Dominiarczyk and O. Delfosse for their valuable laboratory assistance and samples analysis and F. Piraux for the help in statistical analysis.
References
Dimassi, B., Mary, B., Fontaine, S., Perveen, N., Revaillot, S., Cohan, J.P. 2014. Effect of nutrients availability and long-term tillage on priming effect and soil C mineralization. Soil Biol. & Bioch., 78, 332-339.
where Ymax = the asymptote, k = the rate constant (day-1), PE(t) = cumulative PE (days); PEmax = maximal PE, tp = time at which the PE reaches its maximum.
Eq.1 PE(t) = Ymax (1-exp(-kt) )
Eq.2 PE(t) = PEmax t/tp if t ≤ tp , PE(t)=PEmax if t > tp
• Positive PE was found in all treatments. Neither tillage nor depth affected the maximum absolute (mg C kg-1
soil) or specific (mg C g-1 SOC) PE (fig. 3).
• tp was the lowest for NT treatment with high nutrient level in the upper layer • Cumulative PE varied significantly with nutrients (Table 1).
HighN 0-5 cm FIT NT LowN 0-5 cm FIT NT 15-20 cmFIT NT
Tp (days) 70(24)a 44(22)b 75(11)a 60(35)a 80(19)a 80(5)a
PEmax (mg C
kg-1)
78(37)a 73(49)a 126(31)b 136(99)b 116(25)b 131(21)b
Fig. 2. Evolution of cummulative C mineralized in control samples. . Filled and open symbols = FIT and NT treatments.
Table 1. Parameters of the PE model (Eq: 2) Tp and Pemax. Values in brackets are the 95% confidence intervals
Fig. 3. Evolution of cummulative PE. Filled and open symbols = FIT and NT treatments.
