Soil organic carbon dynamics following afforestation of degraded pastures with eucalyptus in southeastern Brazil

Lima, Augusto Miguel Nascimento; Silva, Ivo Ribeiro da; Neves, Júlio César Lima; Novais, Roberto Ferreira; Barros, Nairam Félix de; Mendonça, E. S.; Smyth, Thomas J.; Moreira, Michelle S.; Leite, Fernando Palha

doi:10.1016/j.foreco.2006.08.331

Cited by 121 publications

(79 citation statements)

References 56 publications

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“…Much of this effect on SOM may still reflect the previous land use (unproductive pastures) and may therefore not be an exclusive effect of short-rotation eucalypt. In fact, studies using the natural abundance of the 13 C isotope indicate that the SOM content is slowly recovered after planting short-rotation eucalyptus in soils formerly under degraded, unproductive pastures (Lima et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Leite¹,

Silva

Novais

et al. 2010

Rev. Bras. Ciênc. Solo

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SUMMARYLittle is currently known about modifications in edaphic characteristics caused by short-rotation eucalyptus and the impacts of these alterations on the sustainability of eucalyptus wood production. This study was carried out to identify theses changes at five sites of eucalyptus plantation in the region of the Rio Doce Valley, state of Minas Gerais, Brazil. Areas with more than three previous eucalyptus cycles, adjacent to pasture land or native forest, were chosen. Soil samples were collected and soil fertility analyzed by routine methods and other fractionation methods in order to measure alterations in the K, Ca and Mg contents as a consequence of eucalyptus cultivation. In the eucalyptus areas, reductions in the exchangeable Ca 2+ , Mg 2+ and K + contents and pH were observed and increased Al 3+ and H + Al contents. Of all nutrients, only P contents (Mehlich-1 P) increased in the eucalyptus areas. The reduction in exchangeable forms and in medium-term soil nutrient pools indicates the need for higher nutrient rates than the currently applied in order to prevent nutritional limitations and soil nutrient exhaustion. After several eucalyptus rotations there was a recovery in the SOM content in comparison to degraded pasture soils, although not to the level of the native forest soil. The positive correlation between effective CEC and medium-term nonexchangeable Ca, Mg and K with SOM emphasizes the need for adequate fertilizer and plant residue management to sustain or even increase forest productivity in future cycles.Index terms: exchangeable cations, fertilization, nutrient exhaustion, nutrient reserves.(

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Section: Resultsmentioning

confidence: 99%

Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Leite¹,

Silva

Novais

et al. 2010

Rev. Bras. Ciênc. Solo

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“…However, soil collected from a distinct previous land use may have a significant effect on how the existing microbial communities deal with the newly added Eucalyptus residues. Previous studies have shown that substituting pastures for Eucalyptus plantations led to reduction in SOM (Mendham et al, 2002), but the reverse was found by Lima et al (2006), indicating that not only changes in microbial communities and litter quality affects the stabilization of residue C into SOM, but also the soil C saturation deficit (Castellano et al, 2015). Thus, absolute residue C decomposition values presented in this study must be viewed with due caution.…”

Section: Soilmentioning

confidence: 61%

“…All residues led to significant increases in soil organic C, especially in the SOM fraction associated with mineral particles (HF), which can stabilize organic compounds by protection against degradation (Kleber and Johnson, 2010). Maintaining harvest residues, associated with benefits of cultivation of Eucalyptus on soil C stocks (Lima et al, 2006), is an advantageous way to improve the SOM in Eucalyptus plantations, with consequent gains in system productivity. Moreover, other nutrients are added with the residues and the cumulative effect of this should be studied under natural conditions.…”

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confidence: 99%

Effect of Mineral Nitrogen on Transfer of 13C-Carbon from Eucalyptus Harvest Residue Components to Soil Organic Matter Fractions

Demolinari

Sousa

Silva

et al. 2017

Rev. Bras. Ciênc. Solo

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ABSTRACT:The amount of harvest residues retained in Eucalyptus plantations strongly influences soil organic matter (SOM), but the efficiency of conversion to SOM may vary according to the type of residue. This study evaluated the recovery of C from Eucalyptus residue components -leaves, bark, branches, roots, and a mix of all residues -in different SOM fractions with or without mineral-N supplementation (200 mg kg -1 of N). Variation in natural 13 C abundance was used to trace the destination of residue-derived C in the soil.The C content of the light fraction (LF) and heavy fraction (HF) of SOM increased over a 240-days decomposition period in response to incorporation of Eucalyptus residues in the soil. Bark and leaf residues showed the best results. Bark residues increased the C content of the HF by 45 % over the initial condition. Leaf residues made the largest contribution to LF-C, increasing it by 8.6 times. Leaf residues also led to the highest N contents in the LF and HF, whereas branches, roots, and the mixture of residues caused significant net transfers of N from the HF. Mineral-N supplementation had no effect on stabilization of organic C in the HF of SOM, in which the C could be maintained for longer periods due to physical/colloidal protection against microbial decomposition. These results highlight the importance of keeping Eucalyptus harvest residues in the planted area, especially the bark, which is the most abundant harvest residue component under field conditions, for maintenance of SOM.

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“…Although carbon metabolic diversity decreased in G1 and G2 Eucalyptus plantations due to site preparation and fertilization, the transport of fixed carbon in Eucalyptus to soil through litter fall and root exudates increased soil organic matter with plantation age (Lima et al 2006;Ma et al 2010). Correspondingly, the size of soil microbial communities tends to be directly proportional to total C input, which is the primary energy source maintaining soil microbial communities (Mitchell et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Non-linear impacts of Eucalyptus plantation stand age on soil microbial metabolic diversity

et al. 2013

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Purpose Although it is generally accepted that planting exotic plant species alters metabolic function of soil microbial communities, its temporal dynamic is often ignored when evaluating ecological effects of associated land use changes. To investigate the dynamic impacts of successive Eucalyptus planting on carbon metabolic activities of soil microbial communities, we studied community-level physiological profiles of soil microbial communities in different generations of Eucalyptus plantations. Materials and methods We studied community-level physiological profiles of soil microbial communities, using the Biolog™ Ecoplates incubation, in adjacent first (G1), second (G2), third (G3), and fourth (G4) generation Eucalyptus plantations that were, respectively, aged 3, 8, 14, and 19 years in Guangxi province, southern China. We used the 'space-fortime substitution' approach to investigate the impact of stand age of exotic Eucalyptus plantations on carbon metabolic diversity and activities of soil microbial communities. For each Eucalyptus plantation generation, three experimental plots were randomly selected. In each plot, one composite soil sample from 0 to 10 cm in depth was obtained for the analyses. Results and discussion Single carbon source utilization varied with Eucalyptus plantation stand age. Among preselected 31 carbon sources, utilization of 17 carbon sources changed significantly, which was best described by a quadratic function (ten carbon sources) and an exponential function (seven carbon sources). As a result, cumulative averaged metabolic activity and metabolic diversity of soil microbial communities showed quadratic and exponential changes relative to Eucalyptus plantation stand age. The order of cumulative averaged carbon metabolic activity and metabolic diversity were G1>G4, G3>G2 and G1>G2>G3, G4 (p<0.05), respectively. The factors contributing to carbon source utilization structure of soil microbial communities for different stand ages of Eucalyptus plantations were shrub richness, soil organic carbon content, microbial biomass carbon, C-to-N ratio, and N-to-P ratio. Conclusions Eucalyptus plantation stand age has inconsistent non-linear impacts on two aspects of soil microbial metabolic function: (1) quadratic impacts on carbon metabolic efficiency and (2) exponential impacts on carbon metabolic diversity. The decreasing carbon metabolic diversity has no significant impact on carbon metabolic efficiency during successive Eucalyptus plantings. The results show that the importance of assessing long-term impacts of land use changes on soil microbial communities from exotic plantations by quantifying multi-aspect non-linear changes on soil microbial metabolic function.

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Soil organic carbon dynamics following afforestation of degraded pastures with eucalyptus in southeastern Brazil

Cited by 121 publications

References 56 publications

Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Effect of Mineral Nitrogen on Transfer of 13C-Carbon from Eucalyptus Harvest Residue Components to Soil Organic Matter Fractions

Non-linear impacts of Eucalyptus plantation stand age on soil microbial metabolic diversity

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