Soil organic matter of aggregates physicogenic and biogenic in areas under no-tillage system in the Cerrado, Brazil

Pinto, Luiz Alberto da Silva Rodrigues; Ziviani, Melania Merlo; Morais, Igor de Sousa; Ferreira, Robert; Silva, Wanderson Farias da; Lima, Sandra Santana de; Silva, Cristiane Figueira da; Torres, José Luiz Rodrigues; Pereira, Marcos Gervásio

doi:10.33448/rsd-v10i5.15012

Cited by 4 publications

(2 citation statements)

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“…This pattern is con rmed by the higher values for biogenic aggregates in the NT (statistically), and NF, NT + B, and PP (proportionally) areas when compared with the physicogenic aggregates (Table 3; Regarding the increased number of negative δ 13 C values identi ed in aggregates of biogenic origin (Table 3; 0-0.05 m layer), other authors also identi ed a similar trend. This included the study by Pinto et al (2021b) which examined areas of 6-and 18-year-old NT systems with Brachiaria and Crotalaria spectabilis as cover plants, respectively. Loss et al (2014) reported similar results in areas with NT systems and in secondary forests.…”

Section: Discussionmentioning

confidence: 99%

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Soil aggregation and associated organic matter under management systems in sandy-textured soils, subtropical region of Brazil

Pinto

Morais

Ozório

et al. 2022

Environ Monit Assess

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Increasing the diversity of plant species in agricultural production areas favors the maintenance or improvement of soil quality, particularly for soils with a sandy texture. This bene cial effect is related to the formation of aggregates of different origins. This study aimed to i) verify whether soil use and management affect the proportion of biogenic (Bio) and physicogenic (Phy) aggregates, and ii) verify whether biogenic aggregation is more likely to lead to soil improvement than physicogenic aggregation. Three management systems were evaluated (permanent pasture, PP; no-tillage system, NT; and no-tillage + Brachiaria system, NT + B) as well as a reference area (Atlantic Forest biome vegetation, NF). According to their origin or formation pathway, the aggregates were separated, identi ed, and classi ed as Bio (formed by biological processes) and Phy (resulting from chemical and physical actions). Only the PP area promoted greater aggregate formation through Bio. The PP area also increased the total organic carbon (TOC) content of the aggregates and affected the isotopic signal of δ 13 C. The NT + B system provided an increase in the TOC content of its aggregates in comparison with aggregates in the NT and NF areas. Among the formation pathways, the Bio aggregates had the highest TOC and SOM fractions contents and the most negative δ 13 C values. The higher amounts of plant residues in the soil was more important than the diversity of species in favoring the formation of Bio aggregates. The bene cial effect of Brachiaria can also be observed when adopted in consortium with corn in grain production systems.

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Section: Discussionmentioning

confidence: 99%

“…al. 2014; Mergen Junior et al 2019;Pinto et al 2021b). This favors the activity of soil invertebrates as ecosystem engineers, including earthworms, termites, ants, and other macroorganisms.…”

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confidence: 99%