Soil Organic Matter Fractions Under Second-Rotation Eucalyptus Plantations in Eastern Rio Grande Do Sul

Soares, Emanuelle Mercês Barros; Silva, Ivo Ribeiro; Barros, Nairam Félix de; Teixeira, Rafael Silva; Fonseca, Sebastião; Vasconcelos, Aline de Almeida; Souza, Rodrigo Nogueirade

doi:10.1590/1806-90882017000100007

Cited by 8 publications

(8 citation statements)

References 32 publications

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“…), livestock (forage and wood), agriculture (mentoring, substrate, etc. ), and in the environmental area (CO 2 sequestration) (Silva et al, 2010;Soares et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…They generally promote less demanding species in regards to soil chemistry and physics, since they are less dependent on pesticides; they minimize the action of erosive agents; they require reduced soil preparation and a long cycle between planting-harvesting-planting; they have a high soil nutrient cycling potential throughout the cutting cycle by litter deposition (Pinto et al, 2016); their cultural practices are less intense and use fewer machines or devices while planting and cultivating; when properly managed, they have the potential to provide shelter for fauna, allowing the integrated promotion of natural resource production and conservation (Soares et al, 2017). The evaluation of alterations in soil caused by changes in land use and occupation can become an important parameter to evaluate the sustainability of newer approaches that meet human needs (Silva et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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The effect of vegetation covers on the physical properties of a red latosol

Nappo¹,

Pereira²,

Miguel³

et al. 2017

Afr. J. Agric. Res.

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In this study, the physical properties of a red latosol were assessed under Cerrado (a Savannah like vegetation type) and under of Eucalyptus grandis cultivation. Two contiguous sites of 14 ha each showing similar original vegetation cover, slope, topographic position, soil type, and sun exposure (aspect) were selected. Systematically, 20 sampling points were distributed in each site, from which soil deformed samples were collected to determine soil texture and non-deformed soil samples were collected to determine apparent density, volumetric soil moisture, and penetration resistance. Based on this study's results, it was observed that by changing land cover of Cerrado vegetation to cultivation, E. grandis provided no significant changes, Scott-Knott test (α = 0.05) of soil penetration resistance, density, and volumetric moisture of the red latosol.

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“…), livestock (forage and wood), agriculture (mentoring, substrate, etc. ), and in the environmental area (CO 2 sequestration) (Silva et al, 2010;Soares et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of vegetation covers on the physical properties of a red latosol

Nappo¹,

Pereira²,

Miguel³

et al. 2017

Afr. J. Agric. Res.

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“…In our 2R chronosequence, we found no change in soil C across age classes for the 2R to 60 cm. Other studies of soil with moderate fertility or loamy texture also found limited changes in soil C within the second rotation (Mendham et al 2003;Soares et al 2017). In comparison to sandier sites with a higher potential to gain carbon, the soils with higher clay and silt likely have more protected and stable C, or possibly are closer to becoming more C saturated (Six et al 2002).…”

Section: Discussionmentioning

confidence: 95%

“…These studies, however, are not discerning fastercycling carbon from persistent carbon. Soares et al (2017) does discuss a correlation of molecules associated with chemically stabilizing organic matter (humic acid, fluvic acid, and humin), but this does not account for the physical parameters (aggregate occlusion, pore space inhibiting the activity of microbes) nor the biological controls of microbial communities. With an apparent lack of change in total soil carbon, persistent soil C could be lost and replaced with new vulnerable inputs of labile C. Alternatively, if the persistent C was not being disturbed, there could have been a new dynamic equilibrium.…”

Section: Discussionmentioning

confidence: 99%

“…While many studies of Eucalyptus plantations show limited changes in soil C over one to two rotations (Lepsch 1980;Bashkin and Binkley 1998;Binkley and Resh 1999;Guo and Gifford 2002;Neufeldt et al 2002;Zinn et al 2002;Mendham et al 2003;Binkley et al 2004;Hernández et al 2016;Soares et al 2017), few studies have examined the effects beyond two rotations. The studies that have looked at long-term changes over multiple rotations have generally found that total soil C decreases or remains relatively constant.…”

Section: Introductionmentioning

confidence: 99%

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Soil Sustainability of Forest Bioenergy Feedstocks Across the Americas

Brill¹

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In addition to storing vast amounts of atmospheric carbon (C), soil C in forest plantations also improves soil health by retaining moisture and nutrients, buffering soil pH, supporting microbiota, and improving soil structure and aggregate stability. Eucalyptus plantations are used throughout the tropical/subtropical world for wood production, timber, and pulp. Eucalyptus' utility and adaptability have led to expansions throughout South America. While there is a large amount of literature that focuses on Eucalyptus and soil C in the first 1 or 2 rotations, the long-term impact of plantations on soil C quantity and quality. Here we assess the quantity and quality of soil C down to 60 cm in both the short-term and the long-term chronosequences of Eucalyptus grandis. The short-term chronosequence is represented by second rotation stands in their early, mid, and latestages of a ~10-12 year harvest cycle. The long-term chronosequence is represented by late-stage stands of rotations 1-4 with similar rotation length. We found no significant differences in soil C and nutrients across the second rotation, although the longer-term chronosequence shows a strong downward trend in soil C by the 4th rotation (p = 0.12). Total nitrogen declined across the chronosequence (p = 0.02). Other nutrients, P, K, Ca, and Mg, varied by soil depth and among rotations, showing no significant changes except at a few select depths. To assess C quality, C was separated by density into two fractions: 1) heavy fractions (HF) and 2) free light and occluded fractions (FLF+OC) at 0-15 cm and 45-60 cm. The HF reveals that recalcitrant C is declining in both surface mineral soil (0-15cm) (p ≤ 0.10) and in deeper soils (45-60 cm) (p = 0.06). This suggests that not just the quantity, but also the quality of soil C has declined in E. grandis stands over four rotations. This suggests a degradation in soil and less sustainability as biofuel.

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