Dinâmica do Carbono e Nitrogênio em Plantações de Eucalipto no Rio Grande do Sul

Wink, Charlote; Reinert, Dalvan José; Tornquist, Carlos Gustavo; Silva, Ivo Ribeiro

doi:10.1590/01000683rbcs20140182

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…For N, the inherent complexity of its cycle, which according to Wink et al [69] is influenced by several factors, such as losses in aboveground biomass and translocation of N to the soil through the root system [70], was justified by the highest percentage of estimated standard error compared with the other nutrients. The difficulty in determining N remains even after the litterfall.…”

Section: Discussionmentioning

confidence: 99%

Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Valadão

Carneiro

Ribeiro

et al. 2020

Forests

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The prediction of biological processes, which involve growth and plant development, is possible via the adjustment of mathematical models. In forest areas, these models assist in management practices, silviculture, harvesting, and soil fertility. Diameter, basal area, and height are predictors of volume and biomass estimates in forest stands. This study utilized different non-linear models for estimating biomass and nutrient values in the aerial biomass and roots of an unmanaged eucalypt stand in Cerrado dystrophic soil. It was hypothesized that the models would estimate the nutrients of the aboveground biomass and roots after meeting the selection and validation criteria. By statistical analysis of the parameters and subsequent validation, the Schumacher–Hall model was presented to be the best fit for biomass and nutrients. This result confirmed the ability of different variables, including diameter, basal area, and height, to be predicted. Estimating the nutrient values in the aboveground biomass and roots allowed a better understanding of the quality of the vegetal residues that remained in the soil. For dystrophic soils, which occur in the Cerrado, these estimates become even more relevant.

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Section: Discussionmentioning

confidence: 99%

Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Valadão

Carneiro

Ribeiro

et al. 2020

Forests

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“…However, a discrepancy between the simulated and observed values of TN has been observed in other studies involving tree cultivation. Wink, Reinert, Tornquist, and Silva (2015), who employed the Century 4.5 model to compare different Eucalyptus forests, found that the younger the Eucalyptus forest, the smaller the TN error. Eucalyptus at 20, 44, 120, 156, 180, and 240 months resulted in errors of 6, 16, 54, 70, 22, and 32%, respectively.…”

Section: Comparison Between Simulated and Observed Valuesmentioning

confidence: 99%

Simulating soil carbon and nitrogen trends under an integrated system in the Brazilian Cerrado

Vogado,

Souza,

Althoff

et al. 2023

Acta Sci. Agron.

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Management systems that include trees tend to provide higher amounts of plant biomass to the soil, contributing to the increase in carbon (C) and nitrogen (N) stocks. This study simulated C and N stocks and their compartments in a crop-livestock-forest integration system in the edafoclimatic conditions of the Maranhão Cerrado using the Century 4.5 model. The evaluated areas were native Cerrado vegetation (NV) and crop-livestock-forest integration (CLFI). The calibration process gradually modified the model parameters to better fit the simulated and observed soil C and N stocks. The best fit between the data was obtained after changes in the main parameters (DEC3(2), DEC4, and DEC5) that controlled the rate of decomposition of soil organic matter. C and N stocks increased by 14% and 15%, respectively, over 14 years after replacing NV with CLFI. The slow compartment of C presented greater sensitivity to changes in management, with an increase of 47% compared with that of NV. The active compartment increased by 31% and the passive compartment remained constant for over 14 years. Future scenarios, where pasture was maintained between the eucalyptus trees and the scenario that allowed the soybean, corn, and Brachiaria rotation between the trees, were more effective, accumulating approximately 37 Mg C ha-1. The continuous contribution of residues from the trees and pasture increased C and N stocks in the long-term in the slow fraction, where the total organic carbon increased from 32 to 36 Mg ha-1 when NV was replaced with CLFI. The model predicted the C and N stocks with accuracies ranging from 1 to 11% of the observed values

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“…In this region of Brazil, there is also an application of Century in soils with Eucalyptus sp. (Wink et al, 2015). Although these studies Brazil were generally satisfactory, many suggestions for improving performance of the model in subtropical and tropical regions have been presented.…”

Section: Introductionmentioning

confidence: 95%

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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Dinâmica do Carbono e Nitrogênio em Plantações de Eucalipto no Rio Grande do Sul

Cited by 5 publications

References 20 publications

Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Simulating soil carbon and nitrogen trends under an integrated system in the Brazilian Cerrado

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

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