Simulação da dinâmica do carbono e nitrogênio em um Argissolo do Rio Grande do Sul usando modelo Century

Bortolon, E. S. O.; Mielniczuk, João; Tornquist, Carlos Gustavo; Lopes, Fabíola; Fernandes, Flavia Fontana

doi:10.1590/s0100-06832009000600012

Cited by 19 publications

(28 citation statements)

References 15 publications

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“…Conversely, SON stabilized at 3.48 Mg ha -1 C: the passive N pool was larger than the slow N pool. The relative proportions of SOC and SON pools under grasslands are similar to those reported earlier by Fernandes (2002) and Bortolon et al (2009), working with Century 4.0.…”

Section: Simulation and Calibrationsupporting

confidence: 89%

“…Calibration of conventional tillage was conducted with the experimental treatment CT O/C 180N; treatments NT O/C 180N, NT O+V/C 0N, and NT O+V/C 180N were used to calibrate the model for no-tillage ( Table 2). As proposed by Bortolon et al (2009), an "additional effect of cultivation" was included in the conventional tillage block in the month following tillage to extend the effect of soil disturbance on SOM decomposition into the next month.…”

Section: Methodsmentioning

confidence: 99%

“…An earlier application of Century (version 4), with AES experiment data using the default N parameters to simulate soils under grasslands, consistently overestimated soil N stocks (Fernandes, 2002). Later, following suggestions of Century developers, Bortolon et al (2009) included changes in the VARAT2(1.1) and VARAT3(1.1) fixed parameters. The same modifications where adopted in our study (Table 2), as they were adequate for simulating soil N stocks (Figures 2 and 3).…”

Section: Simulation and Calibrationmentioning

confidence: 99%

“…Early applications of Century (version 4.0) to simulate changes in SOC stocks of soils in the major grain-producing areas of southern Brazil under conservation and no-tillage management were conducted in an Acrisol (UISS, 2007) by Fernandes (2002) and Bortolon et al (2009), andin Ferralsols (UISS, 2007) by Tornquist et al (2009a,b), Bortolon et al (2011) and Lopes et al (2013), respectively, Argissolos and Latossolos in the Brazilian Soil Classification System (Santos et al, 2013). In this region of Brazil, there is also an application of Century in soils with Eucalyptus sp.…”

Section: Introductionmentioning

confidence: 99%

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Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5

Weber

Mielniczuk

Tornquist

2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:The Century model has successfully simulated soil organic matter dynamics in many agroecosystems. However, initial applications in southern Brazil produced mixed results. The objective of this study was to calibrate and validate Century 4.5 to simulate soil carbon (C) and nitrogen (N) dynamics under diverse soil management practices in subtropical Brazil. Soil C and N data from two long-term experiments established on a degraded Acrisol in the early 1980s were used. Treatments were conventional or no-tillage; grass or grass/legume cropping systems; and corn with or without mineral N fertilizer. The calibration process iteratively modified model parameters to match simulated values of C additions and Soil Organic Carbon (SOC) and Soil Organic Nitrogen (SON) stocks to field data measured throughout the 25 years of the experiments. Improved fit between measured and observed data was obtained after key parameter changes. Soil C and N stocks were simulated accurately after these modifications were implemented. Other experimental treatments were used to validate the model. Century successfully simulated increases in C and N stocks under no-tillage cropping systems including legumes. However, the model overestimated Soil Organic Matter (SOM) decomposition in treatments with low N availability, like oat/corn without N fertilizer. Overall, Century version 4.5 showed adequate performance in simulating C and N trajectories of contrasting cropping systems commonly found in southern Brazil. The few discrepancies between measured and modeled SOC stocks do not preclude using Century in regional-scale applications to assess impacts of agricultural practices on soil C and N in southern Brazil.

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Section: Simulation and Calibrationsupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Simulation and Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5

Weber

Mielniczuk

Tornquist

2016

Rev. Bras. Ciênc. Solo

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“…The main constituents of SOM are C (52-58 %) and N (3.7-7 %); the soil levels and pools of these elements vary according to the application rates of plant and animal residues and to the losses resulting from erosion and oxidation by soil microorganisms (Souza et al, 2009). SOM is involved in the balance between the C and N cycles, and its content is stable in soils under native vegetation (Bortolon et al, 2009). When this balance is disrupted, the organic residue input is smaller relative to the output (Cerri et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Soil carbon and nitrogen stocks in traditional agricultural and agroforestry systems in the semiarid region of Brazil

Sacramento¹,

Araújo²,

Escobar

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYIn the semiarid region of Brazil, inadequate management of cropping systems and low plant biomass production can contribute to reduce soil carbon (C) and nitrogen (N) stocks; therefore, management systems that preserve C and N must be adopted. This study aimed to evaluate the changes in soil C and N stocks that were promoted by agroforestry (agrosilvopastoral and silvopastoral) and traditional agricultural systems (slash-and-burn clearing and cultivation for two and three years) and to compare these systems with the natural Caatinga vegetation after 13 years of cultivation. The experiment was carried out on a typical Ortic Chromic Luvisol in the municipality of Sobral, Ceará, Brazil. Soil samples were collected (layers 0-6, 6-12, 12-20, 20-40 and 40-60 cm) with four replications. The plain, convex and concave landforms in each study situation were analyzed, and the total organic C, total N and densities of the soil samples were assessed. The silvopastoral system promoted the greatest long-term reductions in C and N stocks, while the agrosilvopastoral system promoted the smallest losses and therefore represents a sustainable alternative for soil C and N sequestration in these semiarid conditions. The traditional agricultural system produced reductions of 58.87 and 9.57 Mg ha -1 in the organic C and total N stocks, respectively, which suggests that this system is inadequate for these semiarid conditions. The organic C stocks were largest in the concave landform in the agrosilvopastoral system and in the plain landform in the silvopastoral system, while the total N values were highest in the concave landform in the native, agrosilvopastoral and silvopastoral systems.Index terms: carbon sequestration, conservation management, shifting cultivation. 0-6, 6-12, 12-20, 20-40 e 40-60 cm, em RESUMO: ESTOQUES DE CARBONO E NITROGÊNIO DO SOLO EM SISTEMAS AGRÍCOLAS TRADICIONAL E AGROFLORESTAIS NO

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Validation of the Century model to estimate the impact of agriculture on soil organic carbon in Southern Brazil

et al. 2011

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Simulação da dinâmica do carbono e nitrogênio em um Argissolo do Rio Grande do Sul usando modelo Century

Cited by 19 publications

References 15 publications

Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5

Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5

Soil carbon and nitrogen stocks in traditional agricultural and agroforestry systems in the semiarid region of Brazil

Validation of the Century model to estimate the impact of agriculture on soil organic carbon in Southern Brazil

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