Modelo Century de dinâmica da matéria orgânica do solo: equações e pressupostos

Leite, Luiz Fernando Carvalho; Mendonça, Eduardo de Sá

doi:10.1590/s0103-84782003000400015

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…While the observed data show a strong apparent trend to organic matter addition rate, independent of soil texture, there are shortcomings and uncertainties in methods to determine soil MB (Sitompul et al, 1996). An important factor is that biological labiality depends not only on the physical and chemical forms of C (Duxbury et al, 1989), but also on interaction of the compounds of C with others constituents of soil and on environmental conditions (Motavalli et al, 1994;Leite & Mendonc ßa, 2003, Cerri et al, 2004. In addition, there is an uncertainty associated with field sampling.…”

Section: Soil Microbial Biomass Cmentioning

confidence: 99%

Simulation of management and soil interactions impacting SOC dynamics in sugarcane using the CENTURY Model

Brandani¹,

Abbruzzini²,

Williams

et al. 2014

GCB Bioenergy

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Newer methods of management and harvesting of sugarcane are being considered to improve soil and water conservation in Brazil. Our aim in this study was to evaluate soil C dynamics under sugarcane cultivation as influenced by the use of conservation management, using measurements from four different management systems and land use histories, i.e. conventional management with preharvest burning, no burning with residue retention and two systems without burning plus additional organic amendments. Field sites also differed in terms of soil texture. We compared field measurements of soil C stocks, 13C and microbial biomass with simulated results from the Century ecosystem model for each of the sites and management histories. We also did long-term simulations of the management treatments and sites to approximate steady-state SOC levels, to explore potential management-induced differences in SOC stocks and interactions with soil texture. The model accurately represented treatment and site differences for total SOC stocks, in which SOC stocks were strongly affected by both rates of organic matter input to soil and soil clay content. However, the model tended to underestimate the relative contribution of sugarcane-derived C to total SOC for sites with high residue and external organic matter amendments. Measured microbial biomass C across the sites was closely aligned with relative amounts of organic matter input but did not appear to be strongly affected by soil texture, whereas the model predicted that both texture and organic matter input rate would impact microbial biomass C. Long-term simulations of the conservation management alternatives suggested that SOC stocks could be maintained at or above levels in the original native Cerradão vegetation, whereas conventional practices using residue burning would result in a reduction of SOC to ca. 60% of native levels. Our results support the use of the CENTURY model as an aid to assess the impacts of different soil management practices on SOC stocks under sugarcane in Brazil.

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Section: Soil Microbial Biomass Cmentioning

confidence: 99%

Simulation of management and soil interactions impacting SOC dynamics in sugarcane using the CENTURY Model

Brandani¹,

Abbruzzini²,

Williams

et al. 2014

GCB Bioenergy

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“…Although CENTURY was created to simulate the dynamics of organic matter in soils under natural grassland on the North American plains, the model has been successfully applied to tropical conditions (Leite, 2002;Mendonça & Stott, 2003;Leite & Mendonça, 2003;Cerri et al, 2004;Leite et al, 2004a,b;Galdos, 2007;Leite & Mendonça, 2007).…”

Section: The Century Modelmentioning

confidence: 99%

“…All these equations and assumptions are described in more detail in Parton et al (1994a,b), Leite & Mendonça (2003) and Leite & Mendonça (2007).…”

Section: The Century Modelmentioning

confidence: 99%

Calibration of the century, apsim and ndicea models of decomposition and n mineralization of plant residues in the humid tropics

Nascimento¹,

Mendonça

Leite

et al. 2011

Rev. Bras. Ciênc. Solo

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SUMMARYThe aim of this study was to calibrate the CENTURY, APSIM and NDICEA simulation models for estimating decomposition and N mineralization rates of plant organic materials (Arachis pintoi, Calopogonium mucunoides, Stizolobium aterrimum, Stylosanthes guyanensis) for 360 days in the Atlantic rainforest bioma of Brazil. The models´ default settings overestimated the decomposition and Nmineralization of plant residues, underlining the fact that the models must be calibrated for use under tropical conditions. For example, the APSIM model simulated the decomposition of the Stizolobium aterrimum and Calopogonium mucunoides residues with an error rate of 37.62 and 48.23 %, respectively, by comparison with the observed data, and was the least accurate model in the absence of calibration. At the default settings, the NDICEA model produced an error rate of 10.46 and 14.46 % and the CENTURY model, 21.42 and 31.84 %, respectively, for Stizolobium aterrimum and Calopogonium mucunoides residue decomposition. After calibration, the models showed a high level of accuracy in estimating decomposition and N-mineralization, with an error rate of less than 20 %. The calibrated NDICEA model showed the highest level of accuracy, followed by the APSIM and CENTURY. All models performed poorly in the first few months of decomposition and N-mineralization, indicating the need of an additional parameter for initial microorganism growth on the residues that would take the effect of leaching due to rainfall into account.Index terms: legumes, nutrient cycling, organic farming, plant production.

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“…Given the different management practices and the various ways of supplying organic matter to the soil, it is necessary to obtain information on SOC dynamics. Because SOC dynamics may be different in irrigated or rainfed agriculture systems, and the calculation model also needs to be simulated (Leite and Mendonça, 2003;Sobocká et al, 2007;Althoff et al, 2016) under current conditions or climate scenarios. Álvaro-Fuentes and Paustian (2011) observed the behavior of SOC under different agriculture systems (i.e., rainfed and irrigated agriculture systems) and proved the importance of studies related to SOC modelling in agriculture systems.…”

Section: Introductionmentioning

confidence: 99%

Impact of rainfed and irrigated agriculture systems on soil carbon stock under different climate scenarios in the semi-arid region of Brazil

Araújo-Neto¹,

Lyra²,

Cerri³

et al. 2022

J. Arid Land

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Understanding the dynamics of soil organic carbon (SOC) is of fundamental importance in land use and management, whether in the current researches or in future scenarios of agriculture systems considering climate change. In order to evaluate SOC stock of the three districts (Delmiro Gouveia, Pariconha, and Inhapi districts) in the semi-arid region of Brazil in rainfed and irrigated agriculture systems under different climate scenarios using the Century model, we obtained RCP4.5 and RCP8.5 climate scenarios derived from the Eta Regional Climate Model (Eta-HadGEM2-ES and Eta-MIROC5) from the National Institute for Space Research, and then input the data of bulk density, pH, soil texture, maximum temperature, minimum temperature, and rainfall into the soil and climate files of the Century model. The results of this study showed that the Eta-HadGEM2-ES model was effective in estimating air temperature in the future period. In rainfed agriculture system, SOC stock under the baseline scenario was lower than that under RCP4.5 and RCP8.5 climate scenarios, while in irrigated agriculture system, SOC stock in the almost all climate scenarios (RCP4.5 and RCP8.5) and models (Eta-HadGEM2-ES and Eta-MIROC5) will increase by 2100. The results of this study will help producers in the semi-arid region of Brazil adopt specific agriculture systems aimed at mitigating greenhouse gas emissions.

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Modelo Century de dinâmica da matéria orgânica do solo: equações e pressupostos

Cited by 8 publications

References 22 publications

Simulation of management and soil interactions impacting SOC dynamics in sugarcane using the CENTURY Model

Simulation of management and soil interactions impacting SOC dynamics in sugarcane using the CENTURY Model

Calibration of the century, apsim and ndicea models of decomposition and n mineralization of plant residues in the humid tropics

Impact of rainfed and irrigated agriculture systems on soil carbon stock under different climate scenarios in the semi-arid region of Brazil

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