Carbono, Nitrogênio, Abundância Natural de Δ13C e Δ15N do Solo sob Sistemas Agroflorestais

Couto, Wanderson Henrique do; Anjos, Lúcia Helena Cunha dos; Pereira, Marcos Gervásio; Guareschi, Roni Fernandes; Assunção, Shirlei Almeida; Wadt, Paulo Guilherme Salvador

doi:10.1590/2179-8087.117614

Cited by 8 publications

(6 citation statements)

References 19 publications

(22 reference statements)

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“…Guo et al ( 2020) also found higher carbon contents in subsurface layers when evaluating the carbon vertical distribution in an agroforestry. Couto et al (2017) attributed the higher carbon stocks in deeper layers to a higher degree of maturity and processing of this carbon by microorganisms.…”

Section: Resultsmentioning

confidence: 99%

Total and Particulate Contents and Vertical Stratification of Organic Carbon in Agroforestry System in Caatinga

Iwata

Brandão

Braz³

et al. 2021

Rev. Caatinga

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The objective of this work was to evaluate the variation in total and particulate organic carbon contents, carbon vertical stratification, and sensitivity index of organic matter fractions in soils with organic residues arranged in alleys in an agroforestry system, with and without use of fire, in the Caatinga biome, in Brazil. The experiment was conducted in a split-plot arrangement with four replications, with the factor fire in the plots, and the factor organic residues in the subplots. The organic residues used consisted of Gliricidia sepium plants; G. sepium plants and carnauba processing residue; G. sepium plants and bio-compost; and G. sepium plants, carnauba processing residue, and bio-compost, which were evaluated in three soil layers. The alleys with carnauba processing residue, G. sepium plants, and bio-compost presented a better maintenance of particulate, and mineral-associated organic carbon contents. Thus, the agroforestry management in alleys using these three residues was efficient for the maintenance of labile and recalcitrant organic matter compartments. Particulate organic carbon was more sensitive to changes in soil management than total organic matter content, in all alleys, presenting higher sensitivity indexes.

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Section: Resultsmentioning

confidence: 99%

Total and Particulate Contents and Vertical Stratification of Organic Carbon in Agroforestry System in Caatinga

Iwata

Brandão

Braz³

et al. 2021

Rev. Caatinga

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“…The higher levels of CMIC, NMIC, MICq and fungal spores found in the soil under native forest are justified by the higher OCC content and quality, MICq which indicates the quality of soil organic matter [4]. In native forest areas there is a higher volume of litter and roots, which promote increased species diversity [29], organic matter content and nutrient availability [7].…”

Section: Discussionmentioning

confidence: 99%

Soil Microbiological Attributes Under Ecological Restoration Technologies in Subtropical Forest

Rosa

Casali

Bechara

et al. 2020

Braz. arch. biol. technol.

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To accelerate the recovery of degraded environments, it is necessary to use ecological restoration techniques, which require validation according to the ecosystem conditions where are implemented. This work aimed to evaluate soil microbiological attributes under different ecological restoration technologies in a subtropical forest. The study was conducted at UTFPR-DV, southwest of Paraná, in an ecotone between Mixed Ombrophilous Forest and Semideciduous Seasonal Forest and on an Oxisol. In December 2010, a tillage area of at least 17 years old was isolated and the passive restoration, tree planting and nucleation treatments were installed in 40x54 m plots and four replications. In November 2018 the soil was sampled in these plots and in a native forest area as a reference. There were calculated soil organic carbon content (OCC) and microbiological attributes such as microbial biomass N and C (NMIC and CMIC), basal respiration, fungal spore content and the metabolic (qCO2) and microbial quotient (MICq). It can be concluded that nucleation technology can restore soil microbiological attributes but has not yet reached the conditions of a natural environment. Passive restoration is not a good technology for restoring soil microbiological attributes. The higher contents of CMIC, NMIC, OCC, MICq and fungal spores in the soil under native forest compared to HIGHLIGHTS  Soil microbiological attributes are sensitive to evaluate soil quality in ecological restoration. The recovery of soil microbiology is slow in areas under ecological restoration. Changes in forest cover interfere in soil microbiological activity.

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“…The enrichment of δ 15 N values in subsurface can also be attributed to transformations from organic N to mineral N. Thus, as the reactions of mineralization, nitrification, denitrification and volatilization occur associated with N assimilations by plants, there is greater decomposition of the isotope 14 N, leaving the remaining organic matter enriched in 15 N atoms (Couto et al, 2017). Therefore, isotropic values of δ 15 N serve as an indication of the decomposition of organic matter, as the highest values of δ 15 N are found in areas with low contents of organic carbon.…”

Section: Table 1 -Pearson's Correlation Between the Variables Bulk Density (Bdmentioning

confidence: 99%

Isotopic variations of carbon and nitrogen and their implications on the conversion of Cerrado vegetation into pasture

Oliveira

Schiavo

Lima

et al. 2021

Rev. Bras. Ciênc. Ambient. (Online)

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Conversions of natural vegetation into pasture can, in a short time, change the carbon stock and the natural abundance of δ13C in the soil. The objective of this study was to evaluate changes in carbon (C) and nitrogen (N) stocks, as well as in the natural abundance of δ13C and δ15N of Argissolo Vermelho distrófico (Acrisol), in an area of natural vegetation and planted pasture in the Cerrado region of Aquidauana (MS), Brazil. In order to do this, an area of pasture (PA), cultivated for 25 years with Urochloa brizantha, and an area of natural vegetation (NV) were evaluated. Soil samples were collected at intervals of 0.05 m up to 0.60 m depth, and physical attributes, C and N stocks (CSt and NSt) and isotopic variations of δ13C and δ15N of soil were determined. In the 0–0.05 m layer, the highest C and N stocks occurred in NV, 21.99 and 1.9 Mg ha-1, respectively. In the conversion to PA, 14.62 Mg ha-1 of CSt and 1.36 Mg ha-1 of NSt were lost in the 0–0.05 m layer. The area with PA had greater isotopic enrichment of δ13C in the layers of 0–0.05 and 0.05–0.10 m, with values of -18.3 and -17.4‰, respectively, while in the other layers the isotopic values decreased with the mixture between C of C3 and C4 plants. NV showed enrichment in the isotopic signals, in the layers from 0.25–0.30 m up to 0.40–0.45 m, with values between -21.74 and -21.54‰, respectively, which is characteristic of mixed vegetation of C3 and C4 plants. The values of δ15 N showed isotopic enrichment as depth increased, indicating greater mineralization of soil organic matter in both areas. The conversion of Cerrado into pasture and its consequent fragmentation causes negative impacts on the C and N sequestration and storage capacity, both in pasture and in natural vegetation.

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Carbono, Nitrogênio, Abundância Natural de Δ13C e Δ15N do Solo sob Sistemas Agroflorestais

Cited by 8 publications

References 19 publications

Total and Particulate Contents and Vertical Stratification of Organic Carbon in Agroforestry System in Caatinga

Total and Particulate Contents and Vertical Stratification of Organic Carbon in Agroforestry System in Caatinga

Soil Microbiological Attributes Under Ecological Restoration Technologies in Subtropical Forest

Isotopic variations of carbon and nitrogen and their implications on the conversion of Cerrado vegetation into pasture

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