47 results

Phosphorus fractionation in soils of the Paraguayan Chaco under pristine and anthropogenic conditions

Ana Beatriz Candia-Díaz ORCID logo , Jimmy Walter Rasche-Álvarez ORCID logo , Natalia Carolina Escobar Decoud ORCID logo , Diego Augusto Fatecha Fois ORCID logo , Eduardo Corrales Brenes ORCID logo

01/abr/2025

ABSTRACT Land use changes profoundly impact the natural dynamics of soil phosphorus (P), potentially leading to decreased P concentrations. This study aimed to evaluate the different P fractions in soils from Paraguay Central Chaco under pristine and anthropogenic conditions. A randomized complete block design was utilized with two treatments (pristine and anthropogenic usage). Thirty-four composite soil samples were collected from the region at the layer of 0.00-0.20 m, followed by chemical fractionation of P into labile, moderately labile, and non-labile […]

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Agrosilvopastoral system as a potential model for increasing soil carbon stocks: a century model approach

Juliana Martins Ribeiro ORCID logo , Igor Costa de Freitas ORCID logo , Betânia Guedes Souza e Brito ORCID logo , Luiz Arnaldo Fernandes ORCID logo , Luiz Fernando Carvalho Leite ORCID logo , Demerson Luiz de Almeida Barbosa ORCID logo , [...]

04/jul/2023

ABSTRACT Agrosilvopastoral systems have been used as sustainable production models that can promote soil organic carbon (SOC) storage. However, there are no simulation studies with the Century model to estimate the SOC accumulation capacity in the long term, analyzing the effects of management and climate change in integrated crop-livestock-forest (ICLF) systems. This study aimed to simulate soil C dynamics in two chronosequences of land-use composed of native vegetation (NV), degraded pasture (DPA) and ICLF system in the Cerrado of Minas […]

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Agroforestry system improves soil carbon and nitrogen stocks in depth after land-use changes in the Brazilian semi-arid region

Rafael Gonçalves Tonucci ORCID logo , Renato Falconeres Vogado ORCID logo , Rodrigo Dias Silva ORCID logo , Roberto Cláudio Fernandes Franco Pompeu ORCID logo , Melissa Oda-Souza ORCID logo , Henrique Antunes de Souza ORCID logo

06/mar/2023

ABSTRACT Agroforestry systems have the potential to increase soil organic matter, with effects on soil carbon and nitrogen contents, but information on the application of these systems in semi-arid regions is still scarce. This study aimed to analyze soil carbon and nitrogen stocks in the conversion of native forest from the Caatinga Biome into integrated agriculture systems in the Brazilian semi-arid region. We evaluated the following management systems in the Haplic Inceptisol (Cambissolo Háplico eutrófico): (1) Intercropping area, cultivated with […]

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Combined legume and non-legume residues management improve soil organic matter on an Oxisol in Brazil

Jônatas Pedro da Silva ORCID logo , José Ferreira Lustosa Filho ORCID logo , Rafael da Silva Teixeira ORCID logo , Ana Márcia Tresinari Xavier ORCID logo , Ivo Ribeiro da Silva ORCID logo , Emanuelle Mercês Barros Soares ORCID logo

12/dez/2022

ABSTRACT Understanding soil organic matter (SOM) dynamics in production systems on tropical soils is necessary to guide strategies to increase SOM formation. This study aimed to evaluate soil carbon (C) dynamics by combining applications of different plant residues used on tropical soils. An incubation study was carried out with and without adding millet (Pennisetum americanum) residues combined with six crop residues (legumes and non-legumes); and one additional treatment with only millet residue. Higher C-CO2 fluxes recorded in jack bean, sunflower […]

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Model of inner-sphere adsorption of oxyanions in goethite – Why is phosphate adsorption more significant than that of sulfate?

Carla Gomes de Albuquerque ORCID logo , Fabiana Gavelaki ORCID logo , Vander Freitas Melo ORCID logo , Antônio Carlos Vargas Motta ORCID logo , Aldo José Gorgatti Zarbin ORCID logo , Caroline Mariano Ferreira ORCID logo

07/abr/2022

ABSTRACT Phosphorus availability in soils is low due to its strong retention by inner-sphere complexation on minerals in the clay fraction with pH-dependent charges, such as goethite. On the other hand, sulfur has greater availability because it is retained mainly by electrostatic attraction. We evaluated the intensities of the inner-sphere complexation of orthophosphate and sulfate (H2PO4-/HPO42- and SO42- – generically treated as PO4 and SO4) under different experimental conditions (pH, goethite purity, and contact times) on synthetic goethite samples to […]

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Ultramafic soils and nickel phytomining opportunities: A review

Clístenes Williams Araújo do Nascimento ORCID logo , Luiz Henrique Vieira Lima ORCID logo , Ygor Jacques Agra Bezerra da Silva ORCID logo , Caroline Miranda Biondi ORCID logo

07/abr/2022

ABSTRACT Ultramafic soils are originated from ultramafic rocks such as peridotite and serpentinite and are highly enriched in metals (e.g., Ni, Cr, and Co) and depleted in plant nutrients (e.g., P, K, and Ca). Such characteristics make these soils unfavorable for agriculture and have raised environmental concerns on metal release to the environment. From another perspective, ultramafic soils host a diverse flora with higher endemism than surrounding non-ultramafic areas, which has provided scientists with an opportunity to investigate the evolutionary […]

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CO2 emission affected by moisture content and aggregate sizes in a calcareous soil of Comarca Lagunera, Mexico

Santos Martínez-Santiago ORCID logo , Gerardo Sergio Benedicto-Valdés ORCID logo , Armando López-Santos ORCID logo , Hilda Victoria Silva-Rojas ORCID logo , Enrique Ojeda-Trejo ORCID logo , Elsa Marcela Ramírez-López ORCID logo

14/mar/2022

ABSTRACT Soil CO2 emissions are formed from biotic and abiotic processes related to organic carbon (SOC) and inorganic carbon (SIC), respectively. Calcareous soil has a high amount of SIC and occurs mainly in arid areas, and little is known about CO2 emissions from aggregates of this soil. This study aims to evaluate the emission of CO2 of aggregates from calcareous soil in the Comarca Lagunera, Mexico. Soil samples were taken from the layers of 0.00-0.15 and 0.15-0.30 m, and soil […]

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Hierarchical feedbacks of vegetation and soil carbon pools to climate constraints in Brazilian ecosystems

Ivan Francisco de Souza ORCID logo , Lucas de Carvalho Gomes ORCID logo , Elpídio Inácio Fernandes Filho ORCID logo , Ivo Ribeiro da Silva ORCID logo

24/nov/2021

ABSTRACT: It remains unclear whether temperature and precipitation exert independent control on tropical vegetation and soil C pools. Likewise, it is unknown whether the feedbacks of tropical C pools to climate constraints vary with nutrient availability. These aspects are critical to improving our ability to predict the response of tropical C pools to climate dynamics. This review aimed to assess climate data and the spatial distribution of vegetation and soil C pools across the Brazilian territory to investigate i) whether […]

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How sulfate content and soil depth affect the adsorption/desorption of selenate and selenite in tropical soils?

Anderson Mendes Araujo ORCID logo , Josimar Henrique de Lima Lessa ORCID logo , Luiz Gustavo Chanavat ORCID logo , Nilton Curi ORCID logo , Luiz Roberto Guimarães Guilherme ORCID logo , Guilherme Lopes ORCID logo

06/nov/2020

ABSTRACT Sorption of selenate (SeO 4 2- ) and selenite (SeO 3 2- ) is poorly understood in Brazilian agroecosystems, especially in soils from agricultural areas containing different contents of competing anions, such as sulfate (SO 4 2- ). This study aimed to assess the sorption behavior of selenate and selenite at different soil layers of a tropical soil treated with different rates of agricultural gypsum (thus, containing different contents of sulfate), collected under a coffee plantation. Soil samples from […]

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Contribution of the chemical and mineralogical properties of sandy-loam tropical soils to the cation exchange capacity

Antonio Carlos Saraiva da Costa ORCID logo , Ivan Granemann de Souza Junior ORCID logo , Leila Cristina Canton ORCID logo , Luciano Grillo Gil ORCID logo , Rodolfo Figueiredo ORCID logo

18/ago/2020

ABSTRACT Soils originating from the Caiuá sandstone formation have low soil organic matter (SOM), clay content, and cation exchange capacity (CEC). The predominance of one component over the other might decisively influence the CEC of these soils. Particle size distribution and selective dissolution procedures associated to a suit of methods to determine the exchangeable capacity properties might clarify the relative importance of each soil component. The objective of this work was to evaluate the contribution of the different components of […]

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