Soil carbon stock and Plinthosol fertility in smallholder land-use systems in the eastern Amazon, Brazil

Santos, Cicero dos; Ferraz, Altamiro Souza de Lima; Sá, Sandra Oliveira; Gutiérrez, Jhonatan Andrés Muñoz; Braun, Heder; Sarrazin, Max; Brossard, Michel; Desjardins, Thierry

doi:10.1080/17583004.2018.1530026

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…Acta Scientiarum. Agronomy, v. 45, e60794, 2023 -----------------------------(g kg -1 ) ----------------------------- Several studies have observed similar results concerning TOC content in pastures compared to forest areas (Santos et al, 2018a;Rosset et al, 2019;Martins et al, 2020;Bastos, Sanquetta, Maniesi, Sanquetta, & Corte, 2021). These have indicated that perennial pastures, due to the root system with high deposition and soil exploration speed, when well managed, can increase soil C content and stocks to levels that match those of the native vegetation (Reis et al, 2018;Santos et al, 2018a;Rosset et al, 2019;Sarto et al, 2020).…”

Section: Resultsmentioning

confidence: 98%

“…The Amazon region of Maranhão state, Brazil, has the highest deforestation levels of all states containing this biome (Santos et al, 2018a;INPE, 2019), in which 75% of the natural vegetation has been deforested, and the remaining parts are concentrated in small portions of the forest that are protected by law (Santos et al, 2018a;INPE, 2019;Celentano et al, 2020). After deforestation, pastures are commonly established in large areas or temporary crops, causing physical, chemical, and biological changes in the soil (Santos et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

“…In Maranhão State, soils are naturally acidic, nutrient-deficient, and prone to cohesion and erosion processes, which are negative characteristics that are amplified by the adoption of low-tech management practices, such as slash-and-burn agriculture, as well as a lack of correction and soil fertilization, causing variability in soil quality (Santos et al, 2018a;Celentano et al, 2020). Adopting conservation management practices and recovering degraded areas can improve the conditions by increasing soil organic matter (SOM) content (Bungenstab, Almeida, Laura, Balbino, & Ferreira, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…SOM influences the dynamics of soil attributes by acting as an energy source and nutrient reservoir, and by forming and maintaining the soil structure. Therefore, its reduction directly affects the quality and yield of soil (Beltrán, Sainz-Rozas, Galantini, Romaniuk, & Barbieri, 2018;Santos et al, 2018a). The SOM balance acts as a carbon (C) and nitrogen (N) sink and source and is an important reservoir with its dynamics influenced by soil tillage type, management system, and environmental conditions (Assunção, Pereira, Rosset, Berbara, & Garcia, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Carbon, nitrogen, and physical fractions of organic matter in recovered pastures of the Maranhense Amazon

Rego,

Oliveira,

Rosset

et al. 2023

Acta Sci. Agron.

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In Maranhão State, Brazil, soils are naturally acidic, nutrient-deficient, and prone to cohesion and erosion. Removing the natural cover to establish pastures causes physical, chemical, and biological changes in the soil. Therefore, this study aimed to evaluate the contents and stocks of carbon (C), nitrogen (N), and particle-size fractions of soil organic matter (SOM) in pastures with different years of recovery, and compare them with a secondary forest in the Legal Amazon. Four treatments were evaluated: secondary forest, perennial pasture, and perennial pastures recovered for five years and eight years, both of the latter through corn + brachiaria intercropping. The contents and stocks of total organic carbon, total nitrogen, C, and N from the soil organic matter particle-size fractions, as well as the carbon management indexes (CMI) of the 0.00–0.10, 0.10–0.20, 0.20–0.30, and 0.30–0.40 m layers were evaluated. The perennial pasture environment presented the highest total soil C and N contents; however, when observing the granulometric fractions and CMI, these increases were qualitative in relation to the secondary forest. Pasture recovery over eight years contributed to an improvement of soil quality similar to secondary forest, indicating that an increase in SOM quality, quantity, and recovery time related to increased pasture capacity to accumulate C and N in the soil.

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