Silvopastoral system with Eucalyptus as a strategy for mitigating the effects of climate change on Brazilian pasturelands

Bosi, Cristiam; Pezzopane, José Ricardo Macedo; Sentelhas, Paulo César

doi:10.1590/0001-3765202020180425

Cited by 30 publications

(21 citation statements)

References 20 publications

(10 reference statements)

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“…The thinning of the trees, which reduced tree population density from 333 to 165 trees ha −1 , increased PAR transmission in the iCLF positions as compared to that of other studies conducted in the same area (Bosi et al, 2020;Pezzopane et al, 2019). This increase was more intense in the autumn and winter periods because of the near east-west orientation of the tree rows and the local latitude, which together with high solar declination promoted shading throughout the inter-row areas.…”

Section: Discussionmentioning

confidence: 77%

Reducing competition in a crop–livestock–forest integrated system by thinning eucalyptus trees

et al. 2020

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The goal of this study was to evaluate the effects of thinning eucalyptus trees on yield and nutritive value of corn for silage and palisadegrass in a crop–livestock–forest integrated system and to evaluate the total aboveground biomass yield in systems with and without trees. Plant variables, as well as the incidence of photosynthetically active radiation (PAR) and soil moisture, were evaluated between October 2016 and March 2018 in São Carlos, Brazil, in a crop–livestock–forest and a crop–livestock system. In the crop–livestock–forest system, eucalyptus trees (Eucalyptus urograndis clone GG100) were planted in April 2011, in single rows, with 15 × 2 m spacing. In 2016, the trees were thinned, and the spacing was changed to 15 × 4 m. The treatments comprised measurements at 0.00, 3.75, 7.50, and 11.25 m from the trees of the North row in the integrated crop–livestock–forest (iCLF) system and integrated crop–livestock (iCL) system. Palisadegrass (Urochloa brizantha) was sown after harvesting the corn. Corn yields were similar between treatments, with an average of 13.6 Mg ha−1. Corn for silage presented a higher percentage of grain in total biomass in the crop–livestock–forest positions (41.4 and 42.1%) than in the crop–livestock system (35.6%). No differences in forage accumulation were observed. Crude protein content in corn for silage and palisadegrass was higher in the crop–livestock–forest treatments than in the crop–livestock system. Such results indicate that thinning was favorable to production in the crop–livestock–forest system. Total aboveground biomass yield was higher in the iCLF system, indicating better land use for this type of integrated system.

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Section: Discussionmentioning

confidence: 77%

Reducing competition in a crop–livestock–forest integrated system by thinning eucalyptus trees

et al. 2020

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“…The difference in water use between the trees and pasture is smaller when the water supply is limited [19]. Given their capacity to improve water infiltration and storage in the soil [23], agroforestry systems may be an important strategy to mitigate the effects of climate change on Brazilian pasturelands [24]. The present study hypothesized that introducing Eucalyptus trees in an agroforestry system would change the soil water content and lead to greater competition between trees and pasture, especially under dry conditions.…”

Section: Introductionmentioning

confidence: 94%

Deep Soil Water Content and Forage Production in a Tropical Agroforestry System

et al. 2022

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Agroforestry systems integrating tree and forage growth are important for maintaining soil health but may change the soil’s physical-hydric properties. Our goal was to investigate the impact of introducing Eucalyptus trees into a pasture on the soil water content throughout the soil profile. The study was conducted in a 6-year-old agroforestry system where two species of Eucalyptus were introduced into a palisade grass pasture. Soil moisture was sampled at 0.0 (planting row), 2.0, 4.0, and 6.0 m (midpoint between tree rows) from the Eucalyptus tree rows. A monoculture palisade grass pasture was used as a control. The soil water content down to a depth of 50 cm was lowest in the tree row and increased with distance from the trees. In the Eucalyptus row, the soil water content in the 0–50 cm layer was lower than in the monoculture pasture. Agroforestry systems decreased the water content in the superficial layers of the soil in the rainy months; in the dry season, the soil water contents in all layers were similar between the Eucalyptus inter-rows. In most seasons, the agroforest systems reduced the forage production close to the Eucalyptus tree rows, up to 2 m from the trees, likely due to the soil water content decrease. Overall, this study showed that in tropical regions with sandy soils, the grass and trees’ competition must be considered when establishing integrated agroforestry systems in order to maximize the advantages and benefits of the diversified agroecosystem.

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“…Air humidity is an essential factor for plant growth since it allows the stomata to remain open longer, allowing the necessary gas exchange, mainly for photosynthesis activity as well as for transpiration, essential for the absorption of water and nutrients by the roots. The wind speed found for the time 12:00 to 14:00 can be explained by the difference between the shaded areas and the full sun -which they can create a horizontal temperature gradient that causes distinct heating between shade and sun, generating locally advective breezes -and to the possible centralization of the wind by the tree rows [Bosi et al, 2020].…”

Section: Microclimatementioning

confidence: 99%

Impact of Shading of a Silvopastoral System on Microclimate and Botanical Composition of Polyphytic Pasture: A Preliminary Study in the Subtropics

Vieira¹,

Militão²,

Wagner³

et al. 2021

J. Ecol. Eng.

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The silvopasture system is an integrated system which has been widespread in tropical and sub-tropical climates. However, there is a lack of detailed studies regarding agroecological silvopasture systems. This study assessed whether the different levels of shading in an agroecological silvopastoral system influences the microclimate and botanical composition of polyphytic pasture. We used eight paddocks composed of a silvopastoral system in a subtropical climate, with different tree species arranged in simple lines with polyphytic pasture. In each paddock, we established three levels of visual shading (under the canopy, intermediate and full sun). The following microclimatic variables were recorded monthly during the daytime: illuminance, air temperature, air relative humidity, wind speed, and surface soil temperature. The samples of forages were separated into grasses, legumes and spontaneous, then fractionated into leaves, stems, and senescent material. We observed lower values of illuminance and surface soil temperature under the canopy, with differences between full sun and under the canopy at noon. Regarding the forage, the percentage of legumes was higher in full sun, and spontaneous species and leaves had high proportions under the canopy. Based on the results, the agroecological silvopastoral system changed the microclimatic characteristics and altered the plant composition of polyphytic pasture.

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Silvopastoral system with Eucalyptus as a strategy for mitigating the effects of climate change on Brazilian pasturelands

Cited by 30 publications

References 20 publications

Reducing competition in a crop–livestock–forest integrated system by thinning eucalyptus trees

Reducing competition in a crop–livestock–forest integrated system by thinning eucalyptus trees

Deep Soil Water Content and Forage Production in a Tropical Agroforestry System

Impact of Shading of a Silvopastoral System on Microclimate and Botanical Composition of Polyphytic Pasture: A Preliminary Study in the Subtropics

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