Estoques de carbono e nitrogênio no solo cultivado com mamona na Caatinga

Fracetto, Felipe José Cury; Fracetto, Giselle Gomes Monteiro; Cerri, Carlos Clemente; Feigl, Brigitte Josefine; Neto, Marcos Siqueira

doi:10.1590/s0100-06832012000500019

Cited by 20 publications

(17 citation statements)

References 23 publications

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“…It seems that this is a common pattern observed for different crops and different types of land management in several regions of Brazil, like in the northeast (Lima et al, 2011;Fracetto et al, 2012;Barros et al, 2013;Sacramento et al, 2013), in central Brazil (Cardoso et al, 2010;Silva et al, 2011;Guareschi et al, 2012) and in the south (Sisti et al, 2004;Sá et al, 2013;Santana et al, Figure 5. Scatter plot of soil carbon stock losses (data from Assad et al, 2013), and soil nitrogen stock losses found in our study between pasture and native vegetation in the paired study sites (a) 0-10 cm, (b) 0-30 cm and (c) 0-60 cm depth intervals.…”

Section: Land-use Changes Alter Nitrogen and Phosphorus Stocksmentioning

confidence: 74%

“…On the other hand, there are few regional studies considering how nitrogen and phosphorus soil contents will be affected in these integrated agricultural systems. Plot-level studies have reported a decrease in soil nitrogen stocks with cultivation in several N-fertilized areas of Brazil and under different cropping systems (Lima et al, 2011;Fracetto et al, 2012;Barros et al, 2013;Sacramento et al, 2013;Cardoso et al, 2010;Silva et al, 2011;Guareschi et al, 2012;Sisti et al, 2004;Santana et al, 2013;Sá et al, 2013). The same trend has been observed in Chernozem soils in Russia and in prairie soils of Wisconsin in the USA (Mikhailova et al, 2000;Kucharik et al, 2001).…”

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confidence: 99%

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Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Groppo

Lins²,

Camargo³

et al. 2015

Biogeosciences

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Abstract. In this paper, soil carbon, nitrogen and phosphorus concentrations and stocks were investigated in agricultural and natural areas in 17 plot-level paired sites and in a regional survey encompassing more than 100 pasture soils In the paired sites, elemental soil concentrations and stocks were determined in native vegetation (forests and savannas), pastures and crop-livestock systems (CPSs). Nutrient stocks were calculated for the soil depth intervals 0-10, 0-30, and 0-60 cm for the paired sites and 0-10, and 0-30 cm for the pasture regional survey by sum stocks obtained in each sampling intervals (0-5, 5-10, 10-20, 20-30, 30-40, 40-60 cm). Overall, there were significant differences in soil element concentrations and ratios between different land uses, especially in the surface soil layers. Carbon and nitrogen contents were lower, while phosphorus contents were higher in the pasture and CPS soils than in native vegetation soils. Additionally, soil stoichiometry has changed with changes in land use. The soil C : N ratio was lower in the native vegetation than in the pasture and CPS soils, and the carbon and nitrogen to available phosphorus ratio (P ME ) decreased from the native vegetation to the pasture to the CPS soils. In the plotlevel paired sites, the soil nitrogen stocks were lower in all depth intervals in pasture and in the CPS soils when compared with the native vegetation soils. On the other hand, the soil phosphorus stocks were higher in all depth intervals in agricultural soils when compared with the native vegetation soils. For the regional pasture survey, soil nitrogen and phosphorus stocks were lower in all soil intervals in pasture soils than in native vegetation soils. The nitrogen loss with cultivation observed here is in line with other studies and it seems to be a combination of decreasing organic matter inputs, in cases where crops replaced native forests, with an increase in soil organic matter decomposition that leads to a decrease in the long run. The main cause of the increase in soil phosphorus stocks in the CPS and pastures of the plot-level paired site seems to be linked to phosphorus fertilization by mineral and organics fertilizers. The findings of this paper illustrate that land-use changes that are currently common in Brazil alter soil concentrations, stocks and elemental ratios of carbon, nitrogen and phosphorus. These changes could have an impact on the subsequent vegetation, decreasing soil carbon and increasing nitrogen limitation but alleviating soil phosphorus deficiency.

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Section: Land-use Changes Alter Nitrogen and Phosphorus Stocksmentioning

confidence: 74%

mentioning

confidence: 99%

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Groppo

Lins²,

Camargo³

et al. 2015

Biogeosciences

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“…The main land‐use practice is slash and burn of native vegetation to introduce annual crops or pastures (Sousa et al ., ), and the effects of land use have become a key issue for the scientific community concerned with global environmental change (Munoz‐Rojas et al ., ). Especially in the semi‐arid tropics, changes in land cover associated with different land‐use types are important agents of environmental change and degradation (Fracetto et al ., ; Wick et al ., ; Sá et al ., ), which has led to a decline in soil quality through significant changes in their physical, chemical and biological properties in response to soil organic matter (SOM) reduction and erosion (Jordán et al ., ; Barbera et al ., ; Bruun et al ., ). In addition, land‐use change, mainly through conversion of natural vegetation to cropland and/or grazed pastures, may influence many ecological properties (Yu et al ., ), such as soil carbon dynamics and soil microbial properties (Ussiri & Lal, ).…”

Section: Introductionmentioning

confidence: 99%

Land‐Use Type Effects on Soil Organic Carbon and Microbial Properties in a Semi‐arid Region of Northeast Brazil

et al. 2014

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Land‐use change is one of the most important anthropogenic environmental change drivers affecting the biodiversity and functioning of ecosystems. However, there is limited knowledge of the consequences for soil processes in many regions around the globe. The Brazilian semi‐arid ecosystem known as Caatinga has experienced the transformation from native forest into agricultural land, with heretofore unknown effects on soil processes and microbial properties. The aim of this study was to evaluate the impact of five land‐use changes (to maize and cowpea cropland, grape orchard, and cut and grazed pasture) on total organic C (TOC) and total N (TN) stocks and soil microbial properties of Ultisol from Caatinga. Soil samples (0–10 and 10–20 cm depth) were collected during the wet and dry periods. Split–split plot analysis of variance was used to test the effects of land use, soil depth, season and the interaction between land‐use and soil depth on soil microbial properties, TOC and TN stocks. Land‐use effects were more pronounced in the top soil layer than in the lower layer, while the pattern was less consistent in soil microbial properties. Land conversion from native forest to cropland may cause C losses from the soil, but conversion to pastures may even increase the potential of soils to function as C sinks. Grazed pastures showed not only high C and N stocks but also the highest soil microbial biomass and lowest respiratory quotients, all indications for elevated soil C sequestration. Thus, grazed pastures may represent a land‐use form with high ecosystem multifunctionality in Caatinga. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Com o estudo realizado por Fracetto et al (2012) na mesma área envolvendo diferentes tempos de conversão do uso da terra, fora verificado por meio de uma regressão matemática simples que cinco anos após a mudança de uso da terra, a partir da vegetação natural de Caatinga para a implantação da cultura da mamona, metade do estoque de C da vegetação nativa foi perdido para atmosfera e o remanescente após dez anos apresentou perda estimada em 0,5% ao ano.…”

Section: Figura 2 Emissões Acumulada De Co 2 (Mg Munclassified

“…Essa mudança pode proporcionar alterações na ciclagem dos principais elementos químicos no solo, resultando em emissões de GEE (ALBUQUERQUE et al, 2012). De fato, os estoques de C e N contidos nos solos com vegetação nativa sofrem modificações quando esses sistemas são convertidos ao uso agríco-la (FRACETTO et al, 2012) e, dependendo do sistema de manejo do solo empregado, os estoques podem permanecer iguais, aumentar ou diminuir em relação ao sistema natural (CERRI et al, 2009).…”

Section: Introductionunclassified

Emissões De Gases De Efeito Estufa Na Produção De Mamona E De Seus Subprodutos

Fracetto

Feigl³

et al. 2015

Rev. Caatinga

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RESUMO -A maior produção brasileira de mamona (Ricinus communis L.) se concentra na caatinga do estado da Bahia, onde a mudança do uso da terra para o seu cultivo tem sido considerada uma estratégia de recuperação de áreas degradadas. No entanto, alterações no solo nativo proporcionam impactos ambientais, como emissões de gases de efeito estufa (GEE). Presume-se que elevadas emissões de GEE sejam provenientes da mudança do uso da terra para o cultivo de mamona e que os subprodutos dessa oleaginosa também participam dessas emissões. O objetivo deste trabalho foi realizar o inventário das emissões de GEE decorrentes do cultivo da mamona e seus subprodutos. Foi realizado um estudo na Fazenda Floresta, no município de Irecê (BA), onde foram avaliadas: a mudança no estoque de carbono (C) no solo cultivado com mamona e na floresta nativa local; a quantidade de folhas senescentes e fitomassa epígea; e as emissões de GEE provenientes dos subprodutos da produção agrícola de mamona. Os resultados mostraram que a soma das folhas senescentes e fitomassa epí-gea obtida pela poda da mamona é superior a 1,6 Mg ha -1 ano -1 e o uso da torta de mamona no solo apresentou emissões de N 2 O próximas a 600 µg m -2. As emissões provenientes do uso do biodiesel de óleo de rícino representaram menos de 10% das emissões. A mudança de uso da terra foi responsável pelas elevadas emissões de GEE, representando 87% do total em CO 2 eq. Em comparação às emissões estimadas para o etanol de cana-deaçúcar, o biodiesel de mamona apresentou emissões 32% inferiores.Palavras-chave: Semiárido. Mudança de uso da terra. Fitomassa de mamona. Biodiesel. GREENHOUSE GAS FROM CASTOR BEAN PRODUCTION AND THEIR SUBPRODUCTSABSTRACT -The largest production of castor bean (Ricinus communis L.) focuses on Bahia savanna, where the change of land use to their cultivation has been considered a strategy of degraded areas recovery. However, changes in the native soil can arise environmental impacts as greenhouse gases (GHG) emissions. We have assumed that higher GHG emissions come from a change of land use for castor bean cultivation and their subproducts contribute to GHG emissions. The objective of this study was to make the inventory of the emission of GHG resulting from the castor bean cultivation and their sub-products. It was done a study in the municipality of Irecê-BA and were evaluated: changes in carbon (C) soil stocks in cultivated areas with castor bean and Local native forest; a number of senescent leaves and the biomass produced epigeal; GHG emissions from the sub -products of castor bean. The results showed that the sum of senescent leaves and epigeal biomass obtained by castor bean pruning is more than 1.6 Mg ha -1 ano -1 and the castor bean residues used in this soil presented N 2 O emissions close to 600 µg m -2 . The emissions from the use of castor oil biodiesel represented less than 10% of the emissions. The change in land use handled high emissions of greenhouse gases, accounting for 87% of the total in CO 2 eq. Compared to emissions estimated fo...

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Estoques de carbono e nitrogênio no solo cultivado com mamona na Caatinga

Cited by 20 publications

References 23 publications

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Land‐Use Type Effects on Soil Organic Carbon and Microbial Properties in a Semi‐arid Region of Northeast Brazil

Emissões De Gases De Efeito Estufa Na Produção De Mamona E De Seus Subprodutos

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