Physical attributes of distroferric red latosol under four eucalypt species over the long term

Braga, Rafael Malfitano; Dias, Moacir de Souza; Braga, Francisco de Assis; Protásio, Thiago de Paula

doi:10.1590/s1413-70542013000400004

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…The susceptibility of soils to compaction and the extent of soil compaction can be evaluated with different properties of the soil, such as bulk density, porosity, penetration resistance, hydraulic conductivity (Ampoorter et al, 2010;Silva et al, 2011;Moreira et al, 2012;Braga et al, 2013;Lopes et al, 2015;Silva et al, 2016), and more recently, the precompression stress (Araujo-Junior et al, 2011;Figueiredo et al, 2011;Pacheco;Cantalice, 2011;Ajayi et al, 2013). Precompression stress is generally considered as (a) an indicator of the soil mechanical strength (Ajayi et al, 2013); (b) the maximum pressure that should be applied to the soil to prevent compaction (Severiano et al, 2010;Araujo-Junior et al, 2011), and (c) the required pressure by the root system to enable the root elongation (Iori et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Soil compaction during harvest operations in five tropical soils with different textures under eucalyptus forests

et al. 2018

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Traffic of farm machinery during harvest and logging operations has been identified as the main source of soil structure degradation in forestry activity. Soil susceptibility to compaction and the amount of compaction caused by each forest harvest operation differs according to a number of factors (such as soil strength, soil texture, kind of equipment, traffic intensity, among many others), what requires the adequate assessment of soil compaction under different traffic conditions. The objectives of this study were to determine the susceptibility to compaction of five soil classes with different textures under eucalyptus forests based on their load bearing capacity models; and to determine, from these models and the precompression stresses obtained after harvest operations, the effect of traffic intensity with different equipment in the occurrence of soil compaction. Undisturbed soil samples were collected before and after harvest operations, being then subjected to uniaxial compression tests to determine their precompression stress. The coarse-textured soils were less resistant and endured greater soil compaction. In the clayey LVd2, traffic intensity below four Forwarder passes limited compaction to a third of the samples, whereas in the sandy loam PVd all samples from the 0-3 cm layer were compacted regardless of traffic intensity. The Feller Buncher and the Clambunk presented a high potential to cause soil compaction even with only one or two passes. The use of soil load bearing capacity models and precompression stress determined after harvest and logging operations allowed insight into the soil compaction process in forestry soils.

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Section: Introductionmentioning

confidence: 99%

Soil compaction during harvest operations in five tropical soils with different textures under eucalyptus forests

et al. 2018

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“…The time-lag between the soil moisture monitoring and rainfall occurrence impaired the calibration of the saturation moisture (θ s ), showing that a daily resolution is not sufficient to capture the gravitational water movement throughout the 1.0 m depth profile. On the other hand, the values of α and n are following the literature and represent the variability of macro and micro-pores (Braga et al, 2013), highlighting the granular structure and holding water capacity of the Oxidic Latosols.…”

Section: Water Balance and Soil Moisture Dynamics Evaluationmentioning

confidence: 68%

“…The first important observation is related to the calibrated values of the saturation soil moisture (θ s ). Values greater than 0.40 cm 3 cm -3 were not achieved, even though Oxidic Latosols are characterized by great porosity (Braga et al, 2013). The time-lag between the soil moisture monitoring and rainfall occurrence impaired the calibration of the saturation moisture (θ s ), showing that a daily resolution is not sufficient to capture the gravitational water movement throughout the 1.0 m depth profile.…”

Section: Water Balance and Soil Moisture Dynamics Evaluationmentioning

confidence: 99%

Water balance of an Atlantic forest remnant under a prolonged drought period

et al. 2021

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Since prolonged droughts have impacted Atlantic forests in Southeastern Brazil, further investigations to understand the effects of such stressful conditions in their hydrological behavior are required. This study aimed to assess the changes in the water balance of a semi-deciduous Atlantic forest remnant and how the forest responds to droughts. The Standardized Precipitation-Evapotranspiration Index was applied to identify droughts (from 1961 to 2019) and their severity in both the hydrological year and summer scales. Drought impacts on actual evapotranspiration, potential percolation, and soil water storage were assessed using Hydrus-1D, having net precipitation and potential evapotranspiration as inputs. Error analyses (< 10%) confirmed Hydrus-1D suitability for simulating soil moisture. Uncertainties regarding the soil saturated hydraulic conductivity are due to preferential flows, which are not accounted for in Richards’ equation. Drought intensification changed forest hydrology and triggered physiological responses to deal with it. Semi-deciduous Atlantic forests are adapted to dry conditions because of the existence of dry-affiliated species and the activation of physiological mechanisms. However, such adaptations responded differently regarding the drought scales. The intensification of summer droughts increased evapotranspiration and decreased the potential percolation. Leaf shedding changed the canopy structure in a two-year time lag as a response to the intensification of hydrological year droughts. Changes in forest hydrology are sudden and trigger physiological responses, such as leaf shedding, in a delayed process after droughts take place.

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“…O presente estudo foi desenvolvido numa área experimental de teste de espécies e procedências de Eucalyptus spp e Pinus spp, instalada em janeiro de 1974 pelo projeto PRODEPEF/PNUD/FAO/IBDF/BRA-45, sobre Latossolo Vermelho distroférrico típico de textura argilosa (MOURA et al, 1980) (BRAGA et al, 2013). Foram avaliadas quatro parcelas de 25 árvores para cada espécie de eucalipto e pinus.…”

Section: Methodsunclassified

Biomassa E Atividade Microbiana Sob Diferentes Coberturas Florestais

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Sousa

Venturin

et al. 2016

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BIOMASSA E ATIVIDADE MICROBIANA SOB DIFERENTES COBERTURAS FLORESTAISRESUMO BIOMASS AND MICROBIAL ACTIVITY UNDER DIFFERENT FOREST COVERSABSTRACT: This study evaluated the soil fertility, biomass and microbial activity of the soil under forest cover of Eucalyptus grandis, Eucalyptus pilularis, Eucalyptus cloeziana and Corymbia maculata; Pinus Caribbean var. hondurensis, 40 years old, and a fragment of Semideciduous Forest, located on the campus of the Federal University of Lavras. In soil samples collected in the 0-5 cm layer were determined fertility parameters, basal respiration and microbial biomass carbon. The results showed that for the species E. grandis and E. cloeziana the carbon of biomass microbial content was higher than for any other ecosystem evaluated, and equal to those observed under native forest. In contrast, the ground under Pinus had the lowest microbiological indexes. Under C. maculata and E. pilularis the contents were intermediate for this parameter. The basal respiration of all ecosystems was equal. The fertility level was very low in all types of evaluated vegetation.

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Physical attributes of distroferric red latosol under four eucalypt species over the long term

Cited by 5 publications

References 14 publications

Soil compaction during harvest operations in five tropical soils with different textures under eucalyptus forests

Soil compaction during harvest operations in five tropical soils with different textures under eucalyptus forests

Water balance of an Atlantic forest remnant under a prolonged drought period

Biomassa E Atividade Microbiana Sob Diferentes Coberturas Florestais

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