Slash and burn management and permanent or rotation agroforestry systems: A comparative study for C sequestration by century model simulation

Primo, Anaclaudia Alves; Neto, Renato Américo de Araújo; Zeferino, Leiliane Bozzi; Fernandes, Francisco; Filho, J. A. de Araujo; Cerri, Carlos Eduardo Pellegrino; Oliveira, Teógenes Senna de

doi:10.1016/j.jenvman.2023.117594

Cited by 2 publications

(1 citation statement)

References 56 publications

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“…Cecilio Rebola et al 2021;Mukul et al 2022;Primo et al 2023), highlighting the potential of AFSs to restore functional aspects in the Amazon. The practice of burning plant residues and the use of mineral fertilizers may have contributed to the increase in soil acidity over time, as these practices reduce soil pH and favor the release of hydrogen ions (H+) and aluminum (Al + 3) (Chaves et al 2020).…”

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Physical and chemical soil quality and litter stock in agroforestry systems in the Eastern Amazon

de Souza,

Santos,

Martins

et al. 2024

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The influence of biodiversity and age of agroforestry systems (AFS) on the provision of ecosystem services, such as nutrient cycling, needs to be better understood to support management practices that promote such services. This study aimed to quantify and compare litter stock and the physical and chemical attributes of soil in four AFSs with different ages and arrangements to a secondary forest (FLO) in the Eastern Amazon. Litter stock did not differ among the AFSs, but the youngest AFS was lower (5.73 ± 1.04 Mg ha− 1) than in FLO (11.42 ± 2.44 Mg ha− 1). Similarities were found between FLO and the oldest AFS for most of the soil chemical attributes. The soil pH in AFSs was higher than in FLO in the surface layer, and the organic matter content of FLO did not differ from 2 and 51-year-old AFSs. The Al content and aluminum saturation of younger and 26 years-old AFSs were lower than in FLO. Particle density and total porosity did not differ among ecosystems, while soil density in the two younger AFSs was higher than in FLO. According to PCA results, variables such as organic matter, CECpH7, H + Al, Al content, and m % tended to be higher in FLO and oldest AFS. It was evident that the maturity and diversity of AFSs are relevant factors for Amazonian agroforests, as they offer positive impacts on ecosystem functionality, such as nutrient cycling and water retention.

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Physical and chemical soil quality and litter stock in agroforestry systems in the Eastern Amazon

de Souza,

Santos,

Martins

et al. 2024

Preprint

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Predicting changes in soil organic carbon after a low dosage and one-time addition of biochar blended with manure and nitrogen fertilizer

2023

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Modeling plays an important role in predicting the long-term effects of biochar on soil organic carbon dynamics. The objective of our study was to apply the Century model to assess changes in temporal soil organic carbon in soil amended with manure and nitrogen fertilizer (MN), with manure and biochar (MB) or with manure, nitrogen fertilizer and biochar (MNB). We determined that, after 115 years, soil organic carbon stocks could not reach a steady state (equilibrium) or pre-cultivation levels, regardless of amendment type. Our results showed that a biennial input of manure and nitrogen fertilizer (MN) led to a 84% increase in soil organic carbon compared to a 79% (MNB) and 70% (MB) increase when amendments contained biochar. However, the quantity of organic matter input from crop residues and amendments was sufficient to increase the active fraction, with a turnover time of months to years, by 86%. In fact, carbon associated with the slow fraction, with a turnover time of 20 to 50 years, was the key driver for soil organic carbon accumulation in all amendment types. Although the passive fraction is the most stable form of carbon in the soil, with a turnover time of 400 to 100 years, once manure and biochar were added to the soil, this fraction increased up to 32%. Our results provided further insight into the ability of Century to accurately predict changes in soil organic carbon stocks when a combination of manure, nitrogen fertilizer or biochar were added to soil. Century predicted soil organic carbon stocks within -1% to +9% of measured values. However, further fine-tuning of the model is required since biochar undergoes chemical transformations (e.g., ageing) and changes soil physical parameters (e.g., bulk density) that can not be currently accounted for in the Century model. Addressing these limitations of Century will also help to increase the relationship between measured and predicted values.

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Slash and burn management and permanent or rotation agroforestry systems: A comparative study for C sequestration by century model simulation

Cited by 2 publications

References 56 publications

Physical and chemical soil quality and litter stock in agroforestry systems in the Eastern Amazon

Physical and chemical soil quality and litter stock in agroforestry systems in the Eastern Amazon

Predicting changes in soil organic carbon after a low dosage and one-time addition of biochar blended with manure and nitrogen fertilizer

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