Carbon Fluxes from Different Pools in a Mined Area under Reclamation in Minas Gerais State, Brazil

Oliveira, Dener Márcio da Silva; Silva, Ivo Ribeiro da; Mendes, Gilberto de Oliveira; Vasconcelos, Aline de Almeida; Mayrink, Gustavo Conforti Ventura; Verburg, Ernst Eduard Jan

doi:10.1002/ldr.2601

Cited by 11 publications

(15 citation statements)

References 49 publications

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“…Other studies have shown that the supply of fresh C and high N fertilization can destabilize subsoil C because of priming effects (Fontaine et al, ; Khan et al, ; da Silva Oliveira et al, ). Recent findings also indicate that microbial community composition can strongly change with N fertilization (Kuslien et al, ; Fanin et al, ) and that microbial activity governs the integration of new C‐input into the soil (Lange et al, ).…”

Section: Discussionmentioning

confidence: 99%

Decadal Nitrogen Fertilization Decreases Mineral‐Associated and Subsoil Carbon: A 32‐Year Study

et al. 2017

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Crop residues and manure are important sources of carbon (C) for soil organic matter (SOM) formation. Crop residue return increases by nitrogen (N) fertilization because of higher plant productivity, but this often results only in minor increases of SOM. In our study, we show how N fertilization and organic C additions affected SOM and its fractions within a 32‐year‐long field‐experiment at Puch, Germany. Five organic additions, no‐addition (control), manure, slurry, straw and straw + slurry, were combined with three mineral N fertilization rates (no, medium and high fertilization), which resulted in 1·17–4·86 Mg C‐input ha‐1 y‐1. Topsoil (0–25 cm) SOM content increased with N fertilization, mainly because of the C in free light fraction (f‐LF). In contrast, subsoil (25–60 cm) SOM decreased with N fertilization, probably because of roots' relocation in Ap horizon with N fertilization at the surface. Despite high inputs, straw contributed little to f‐LF but prevented C losses from the mineral‐associated SOM fraction (ρ > 1·6 g cm‐3) with N fertilization, which was observed without straw addition. Above (straw) and belowground (roots) residues had opposite effects on SOM fractions. Root C retained longer in the light‐fractions and was responsible for SOM increase with N fertilization. Straw decomposed rapidly (from f‐LF) and fueled the mineral‐associated SOM fraction. We conclude that SOM content and composition depended not only on residue quantity, which can be managed by the additions and N fertilization, but also on the quality of organics. This should be considered for maintaining the SOM level, C sequestration, and soil fertility. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Decadal Nitrogen Fertilization Decreases Mineral‐Associated and Subsoil Carbon: A 32‐Year Study

et al. 2017

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“…Quantifying the progress or the effectiveness of any reclamation effort is often difficult given that many soil properties (e.g., SOM) generally require long timescales to exhibit measurable changes. Thus, the extent by which reclamation of degraded lands progresses must be based on the monitoring and evaluation of soil quality indicators (Oliveira et al, ; Shrestha & Lal, ; Tesfahunegn, ). Although identifying possible synergies among distinct soil quality indicators is desirable, assessing such interactions is rather challenging.…”

Section: Introductionmentioning

confidence: 99%

Practices for rehabilitating bauxite‐mined areas and an integrative approach to monitor soil quality

et al. 2019

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Mining activities cause severe impacts to soil, the restoration of which requires specific management, and proper evaluation and monitoring. In this research, our objectives were to study recovery strategies and integrate indicators for monitoring the reclamation of an agricultural soil after bauxite mining. Distinct fertilizations (nonfertilized control [CT], poultry litter [PL], chemical fertilization [CF], and PL + CF combined) and intercrops (bare soil with no intercrops [NI], grass [G], legume [L], and G + L combined) treatments were used as recovery strategies to restore soil capacity to sustain a coffee plantation. We selected 27 quality indicators to compare the premining condition, postmining (reconfigured topsoil), and 19 months after the application of fertilization/intercrops treatments. We used univariate statistics to select soil quality indicators and multivariate analyses to group the selected indicators into organic, chemical, physical, and microbiological properties. From each group, one representative attribute was selected, and its averaged weight was summarized into a soil quality index (SQI). In postmining, the estimated SQI was approximately 65% lower than in premining. The SQI recalculated 19 months after the application of fertilization (PL or PL + CF) and intercrops (G, L, or G + L) was 23% higher than in postmining and showed strong correlation with coffee bean yield (at 27 months). Coffee bean yield was highest in plots with L or G + L receiving PL or PL + CF. We conclude that organic amendments and intercrops are suitable approaches to recover soil following bauxite mining, and soil indicators can be integrated to properly monitor the land reclamation progress.

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“…In this context, phospholipid fatty acids (PLFAs) analyses have been used to obtain the profiling of the active microbial community in soils ( Willers et al., ; Schmidt et al., ). Thus, PLFAs analyses could help to obtain an assessment of the impact of mining and soil stockpiling on the microbial community ( Birnbaum et al., ), and also an assessment of the response of soil microbes to reclamation practices ( Narendrula‐Kotha and Nkongolo , ). This also would allow the identification of microbes most sensitive to the impact of mining or those most responsive to the reclamation practices applied.…”

Section: Introductionmentioning

confidence: 99%

“…This is because stockpiled topsoil may store viable seeds of the former vegetation and also might work as a source of microbial inoculum during land reclamation (Sheoran et al, 2010). Subsequent improvements in soil structure can be achieved by building terraces to reduce erosion and increase water infiltration rates (Oliveira et al, 2017). Following improvements in soil structure, soil fertility also should be improved by mineral and organic fertilizations, either isolated or in combination (Hu et al, 2015;Oliveira et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Subsequent improvements in soil structure can be achieved by building terraces to reduce erosion and increase water infiltration rates (Oliveira et al, 2017). Following improvements in soil structure, soil fertility also should be improved by mineral and organic fertilizations, either isolated or in combination (Hu et al, 2015;Oliveira et al, 2017). These aspects are critical to restore plant growth in areas degraded by mining because bauxite deposits are often associated to highly weathered soils with low nutrient reserves (Harris, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Impact of fertilization on cover crops and microbial community on a bauxite‐mined soil undergoing reclamation

Teixeira

Souza

Santos

et al. 2019

J. Plant Nutr. Soil Sci.

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The reclamation of bauxite‐mined areas can be favored by the application of organic and/or chemical fertilization to restore the vegetation. Otherwise, the impact of fertilizations on soil microbiota or plant–microbe interactions as land reclamation progresses is less understood. To address this issue, we evaluated the impact of organic and chemical fertilization on plants and soil microbial community within the first 36 months of land reclamation in a bauxite‐mined site. The experiment was set up according to a split‐plot design in which the main plots received fertilizations [non‐fertilized control (NF), chemical fertilization (CF; NPK and rock phosphate), organic fertilization (OF; poultry litter), and CF+OF combined], and the subplots received cover crops [no cover crops (NC), grass (B; Brachiaria), legume (S, Stylosanthes), and B+S combined]. Cover crops biomass yield was assessed annually with five field campaigns per year. We used phospholipid fatty acids (PLFAs) to infer the impacts of mining and restoration practices on actinobacteria, Gram‐negative and Gram‐positive bacteria, arbuscular mycorrhizal fungi, and fungi. Accordingly, PLFAs were determined before bauxite mining (pre‐mining), six months after topsoil reconfiguration (post‐mining), and after 14 and 36 months following the application of the fertilizations and cover crops. PLFAs results indicated that in post‐mining, the living microbiota was significantly lower than in pre‐mining. Cover crops biomass yield was highest for B and B+S fertilized with CF+OF at 14 and 36 months. Both parametric and non‐parametric statistics showed a temporal variation in the response of living microbes to the treatments applied. After 14 months, living microbes showed greatest response to OF, while at 36 months their response was strongest in the treatments with highest plant biomass production (B and B+S). These results suggest that in the early stages of land reclamation, living microbial biomass benefit the most from organic fertilizers. As this initial boost decline, living microbes are more likely to thrive in areas undergoing reclamation where they can develop synergistic interactions with plants.

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Carbon Fluxes from Different Pools in a Mined Area under Reclamation in Minas Gerais State, Brazil

Cited by 11 publications

References 49 publications

Decadal Nitrogen Fertilization Decreases Mineral‐Associated and Subsoil Carbon: A 32‐Year Study

Decadal Nitrogen Fertilization Decreases Mineral‐Associated and Subsoil Carbon: A 32‐Year Study

Practices for rehabilitating bauxite‐mined areas and an integrative approach to monitor soil quality

Impact of fertilization on cover crops and microbial community on a bauxite‐mined soil undergoing reclamation

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