Soil Microbial Attributes Under Agroforestry Systems in the Cerrado of Minas Gerais

Martins, Juliana; Fernandes, Luiz Arnaldo; Oliveira, Agda Loureiro Gonçalves; Sampaio, Regynaldo Arruda; Frazão, Leidivan Almeida

doi:10.1590/2179-8087.047616

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…Here, the soil C content (∼41 g kg −1 ) at 0 and 4 m from both legumes was higher than reported by Mosquera, Buurman, Ramirez, and Amezquita (2012) (∼30 g kg −1 ) in a silvopastoral system with B. decumbens intercropped with legumes and more than double that reported by López-Díaz, Benítez, and Moreno (2017) in an agroforestry system at 20 cm depth. Rainfall promotes the transport of chemical elements and organic compounds into deeper soil layers (Homyak et al, 2018;Martins, Fernandes, Oliveira, Sampaio, & Frazão, 2018). This might explain the low C and N soil contents on B during the dry season in the first years of silvopastoral system establishment.…”

Section: Discussionmentioning

confidence: 99%

Legume silvopastoral systems enhance soil organic matter quality in a subhumid tropical environment

Lira

Fracetto

Ferreira

et al. 2020

Soil Science Soc of Amer J

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The silvopastoral system avoids the degradation of tropical grasslands by providing essential nutrients to the soil while improving livestock diet and farmer's income by increasing the marketable wood supply. We hypothesize that intercropping shrub‐tree legumes into signalgrass increases microbial activity and soil organic matter (SOM) quality. We investigated silvopastoral system soils over 5 yr in a subhumid climate in northeastern Brazil to determine the total C and N contents and to estimate C‐microbial biomass and respiration, microbial and metabolic quotients, humic acid (HA), and fulvic acid (FA). The experimental design evaluated (a) signalgrass intercropped with gliricidia at 0, 4, and 8 m from the center of the double legume row; (b) signalgrass intercropped with sabia at 0, 4, and 8 m from the center of the double legume row; and (c) single signalgrass. Samples were obtained after 2, 3, 4, and 5 yr from silvopastoral system implementation. The shrub‐tree legumes soils had total C (39 g kg−1) and total N (3.8 g kg−1) contents significantly higher (30 and 72%, respectively) than single signalgrass soil only on the fifth year after establishment. Microbial biomass C at 0 and 4 m from the legume's rows was 700 mg kg−1, which was 75% higher than single signalgrass soils. There was strong microbial respiration (∼50 mg C‐CO2 kg−1 d−1) in legumes soils, but the metabolic quotient did not indicate disturbance in microbial activity. The microbial quotients were significantly higher in shrub‐tree legumes soil, and the HA/FA ratio was nearly 1, demonstrating greater efficiency in SOM decomposition by microbial activity. Overall, 5 yr after establishment, the silvopastoral system has improved SOM quality and contributed to grassland sustainability.

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Section: Discussionmentioning

confidence: 99%

Legume silvopastoral systems enhance soil organic matter quality in a subhumid tropical environment

Lira

Fracetto

Ferreira

et al. 2020

Soil Science Soc of Amer J

View full text Add to dashboard Cite

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“…The soil microbial biomass (SMB) is responsible for biological and biochemical processes in the soil and can be altered by the conditions of the environment in which they are inserted (Martins et al, 2018). In the Cerrado, the high amount of plant species and presence of plants with a high developed root system than the aerial part allow greater abundance of organic residues, enzymatic substrates and nutrients, as well as better aeration of the soil (Myers et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

Does Crop-Livestock-Forest Systems Contribute to Soil Quality in Brazilian Savannas?

2019

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In this paper we discuss the impact on conversion degraded pasture areas into an integrated crop, livestock and forest system (ICLFS). We collected 30 soil samples at 0-0.1 m depth in five agroforestry systems, degraded pasture and native areas along Brazilian Cerrado biome. We analyzed the influence of chemical variables on microbial biomass carbon and enzyme activity using multivariate statistic analysis. The land use explained only the variation of microbial biomass carbon and seasonality explained the variation in glycine aminopeptidase activity. The sample controls differ from the other soil areas due to their greater biological activity (MBC). The enzymatic indicators showed that the biological activity is lower in degraded pasture. It was observed that the ICLFS system had a positive effect on the microbial activity (MBC and soil enzyme) when compared to pasture. This reinforces the importance of adopting more sustainable practices to improve soil quality.

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Carbon and nitrogen stocks and organic matter fractions in the topsoil of traditional and agrisilvicultural systems in the Southeast of Brazil

et al. 2021

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The adoption of conservationist systems can improve the protection of soil organic matter (SOM) and mitigate greenhouse gas emissions. Thus, we aimed to quantify the soil carbon (C) and nitrogen (N) stocks, C content in the SOM fractions and microbial C (Cmic) in the topsoil of an Acrisol under traditional and agrisilvicultural systems in the Southeast of Brazil. The evaluated treatments were native vegetation of Cerrado (NV), pasture of Urochloa brizantha (PAST), monoculture of pigeon pea (MCP), and agrisilvicultural system (Eucalyptus+pigeon pea; AGS). Soil samples were collected at depths of 0–5, 5–10, and 10–20cm to determine the soil C and N contents and stocks, C associated with granulometric and humic fractions of SOM, and soil Cmic. The C contents in AGS and MCP systems were similar to NV at 5–10 and 10–20cm, and soil C stocks in AGS were similar to NV and higher than in PAST system at 0–20cm. We found a higher percentage of protected C in the silt+clay fraction, and the AGS system contributed to an increase in this organomineral fraction at 10–20cm soil depth. The C contents in the free light fraction (0–5cm) and humin (5–10 and 10–20cm) were also similar between AGS and NV, giving greater protection of SOM in both systems. For Cmic and microbial quotient values we found no differences among the evaluated systems. The results indicated that after conversion of NV to different land uses, the AGS system more effectively increased the C stocks in the topsoil and protected the SOM.

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Soil Microbial Attributes Under Agroforestry Systems in the Cerrado of Minas Gerais

Cited by 5 publications

References 25 publications

Legume silvopastoral systems enhance soil organic matter quality in a subhumid tropical environment

Legume silvopastoral systems enhance soil organic matter quality in a subhumid tropical environment

Does Crop-Livestock-Forest Systems Contribute to Soil Quality in Brazilian Savannas?

Carbon and nitrogen stocks and organic matter fractions in the topsoil of traditional and agrisilvicultural systems in the Southeast of Brazil

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