Carbon mineralization kinetics in soils under urban environment

Saviozzi, Alessandro; Vanni, G.; Cardelli, Roberto

doi:10.1016/j.apsoil.2013.08.007

Cited by 40 publications

(25 citation statements)

References 49 publications

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“…However, no strong connection was found between the texture and C decomposition. Other authors, however, reported less C mineralization in clay soils (Frøseth and Bleken, 2015;Hassink, 1995;Saviozzi et al, 2014), suggesting that clay minerals give protection against SOM degradation. Nevertheless, besides the TOC, TN, WEOC and TSN content, soil texture was found in the PCA evaluation to be a decisive factor separating low and high values of kinetic parameters (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 95%

Kinetic parameters of soil organic matter decomposition in soils under forest in Hungary

et al. 2018

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To obtain better knowledge on how soil organic matter (SOM) decomposition is regulated by different soil properties, 13 soil samples amended with maize residues were incubated for 163 days. Carbon mineralization kinetics was modelled by fitting five different kinetic models, from which the first-order two pools model was selected for further analysis. The results showed that residue addition increased the rate of C mineralization, particularly in sand samples, where four times as much C was released as CO 2 in amended samples as in control samples. Residue addition also affected the kinetic parameters of the two C pools modelled. The mean residence time (MRT) averaged 31.9 days for the fast C pool and 65.1 days for the slow C pool phase in the amended soils, whereas in the control soils MRT 1 and MRT 2 averaged 52.3 and 94.2 days, respectively. The kinetics of C decomposition was found to be influenced to the greatest extent by soil organic carbon (SOC) content and soil texture. The texture primarily affected the size of the fast carbon pool (C 1 ): in both the amended and control samples C 1 was increased by the clay content (r = 0.574 and r = 0.554, respectively) and decreased by the sand content (r = 0.771 and r = 0.583, respectively). Our results confirm the fact that texture has a significant role in soil organic matter mineralization, however other parameters also play a crucial role in the decomposition due to the complexity of the processes.

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Section: Accepted Manuscriptmentioning

confidence: 95%

Kinetic parameters of soil organic matter decomposition in soils under forest in Hungary

et al. 2018

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“…This model previously offered the most appropriate description of the cumulative C-CO 2 evolution data in soils (Bernal et al, 1998;Saviozzi et al, 2014). The special model is a combination of two different kinetic equations, which suggest that the organic carbon content of the soils consisted of two fractions with different degrees of biodegradability (Bernal et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Carbon mineralization in acidic soils amended with an organo-mineral bentonite waste

Rodríguez-Salgado

Pérez‐Rodríguez

Santás

et al. 2017

J. Soil Sci. Plant Nutr.

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Bentonite based organic-mineral wastes contains high concentrations of organic matter and plant nutrients and hence presents a high potential as a soil amendment. However, it also can have high salinity and high copper concentrations that may cause negative effects on microorganisms when the soil is amended with this type of wastes. In this work, the effect of soil amendment with a bentonite based winery waste on soil carbon mineralization was studied in acidic vineyard soils as an indicator of soil quality. The carbon mineralization in the waste is significantly lower and slower than that in the studied vineyard soils despite its significantly higher amount of organic carbon. However, when the bentonite winery waste was added to the soils, the carbon mineralization showed positive priming effects (increased between 78 and 337%). Therefore, reductions in the carbon mineralization, and hence changes on short-term organic matter turnover are not expected after bentonite waste amendment in acid soils.

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“…Peltre et al (2013) calibrated EOM pool parameters of the DAISY model utilizing respiration curves from amended soil incubated at 15 • C for 56 days. Saviozzi et al (2014) performed an incubation of 25 days at 25 • C to infer the labile and recalcitrant EOM-C pool parameters. Similar conclusions concerning the suitability of short-term incubations to obtain reliable EOM characterization were drawn by Beloso et al (1993), Pedra et al (2007) and Garcia et al (1992) utilizing incubation periods of 21, 28 and 42 days, respectively.…”

Section: Suitability Of Short-term Incubations To Assess Eom Pool Parmentioning

confidence: 99%

Modification of the RothC model to simulate soil C mineralization of exogenous organic matter

et al. 2017

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Abstract. The development of soil organic C (SOC) models capable of producing accurate predictions for the long-term decomposition of exogenous organic matter (EOM) in soils is important for the effective management of organic amendments. However, reliable C modeling in amended soils requires specific optimization of current C models to take into account the high variability in EOM origin and properties. The aim of this work was to improve the prediction of C mineralization rates in amended soils by modifying the RothC model to encompass a better description of EOM quality. The standard RothC model, involving C input to the soil only as decomposable (DPM) or resistant (RPM) organic material, was modified by introducing additional pools of decomposable (DEOM), resistant (REOM) and humified (HEOM) EOM. The partitioning factors and decomposition rates of the additional EOM pools were estimated by model fitting to the respiratory curves of amended soils. For this task, 30 EOMs from 8 contrasting groups (compost, anaerobic digestates, sewage sludge, agro-industrial waste, crop residues, bioenergy by-products, animal residues and meat and bone meals) were added to 10 soils and incubated under different conditions. The modified RothC model was fitted to C mineralization curves in amended soils with great accuracy (mean correlation coefficient 0.995). In contrast to the standard model, the EOM-optimized RothC was able to better accommodate the large variability in EOM source and composition, as indicated by the decrease in the root mean square error of the simulations for different EOMs (from 29.9 to 3.7 % and 20.0 to 2.5 % for soils amended with bioethanol residue and household waste compost, respectively). The average decomposition rates for DEOM and REOM pools were 89 and 0.4 yr−1, higher than the standard model coefficients for DPM (10 yr−1) and RPM (0.3 yr−1). The results indicate that the explicit treatment of EOM heterogeneity enhances the model ability to describe amendment decomposition under laboratory conditions and provides useful information to improve C modeling on the effects of different EOM on C dynamics in agricultural soils. Future research will involve the validation of the modified model with field data and its application in the long-term simulation of SOC patterns in amended soil at regional scales under climate change.

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Carbon mineralization kinetics in soils under urban environment

Cited by 40 publications

References 49 publications

Kinetic parameters of soil organic matter decomposition in soils under forest in Hungary

Kinetic parameters of soil organic matter decomposition in soils under forest in Hungary

Carbon mineralization in acidic soils amended with an organo-mineral bentonite waste

Modification of the RothC model to simulate soil C mineralization of exogenous organic matter

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