Impacto da conversão floresta - pastagem nos estoques e na dinâmica do carbono e substâncias húmicas do solo no bioma Amazônico

Araújo, Edson Alves de; Ker, João Carlos; Mendonça, Eduardo de Sá; Silva, Ivo Ribeiro da; Oliveira, Erika Karla

doi:10.1590/s0044-59672011000100012

Cited by 52 publications

(48 citation statements)

References 35 publications

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“…Quanto aos valores de δ 13 C, o tratamento FFF, representado pela floresta pouco alterada, cuja principal característica é de não ter sido convertida em outro uso, apresentou os menores valores de δ 13 C, 2010), em estudos também realizados na Floresta Atlântica, assim como os realizados em outros biomas brasileiros (Roscoe et al, 2000;Jantalia et al, 2007;Martinelli et al, 2009;Costa Júnior et al, 2011;Araújo et al, 2011).…”

Section: Abundância Natural De 13 Cunclassified

Estoque de C e Abundância Natural de 13C em Razão da Conversão de Áreas de Floresta e Pastagem em Bioma Mata Atlântica

Dortzbach

Pereira

Blainski

et al. 2015

Rev. Bras. Ciênc. Solo

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rEsumoConversões da cobertura vegetal decorrentes do manejo podem alterar o estoque de carbono e a abundância natural de 13 C. objetivou-se avaliar o estoque de C e a abundância natural de 13 C em áreas de sucessão de floresta (F) e pastagem (P), com diferentes tempos de uso, na Floresta Atlântica no Estado de santa Catarina. sete sucessões de uso entre A conversão de F em P proporcionou aumento da Ds e reduções nos teores de COT e no ECOT do solo. O maior valor de ECOT ocorreu nas áreas atualmente ocupadas por florestas, mesmo tendo sido utilizadas como pasto anteriormente. Áreas de floresta secundária tenderam, em relação aos teores de COT, a um novo equilíbrio, dado que foram verificados teores de COT superiores aos quantificados em áreas de floresta primária. As áreas de floresta e pastagem, com diferentes idades de uso e nas diferentes profundidades de solo avaliadas, evidenciaram respostas na δ 13 C, resultando em diferentes assinaturas isotópicas, confirmando a mudança de uso de plantas C 3 para C 4 . Em pastagens com 50 anos de uso, na camada de 0,00-0,10 m, 66 % do COT Recebido para publicação em 21 de agosto de 2014 e aprovado em 3 de julho de 2015.

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Section: Abundância Natural De 13 Cunclassified

Estoque de C e Abundância Natural de 13C em Razão da Conversão de Áreas de Floresta e Pastagem em Bioma Mata Atlântica

Dortzbach

Pereira

Blainski

et al. 2015

Rev. Bras. Ciênc. Solo

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“…The lowest values were found in the backslope of the forest (F2), while the highest values were found in the summit profile of the pasture (P1), with a maximum value of 5.5 in the soil surface. Based on these pH values, the profiles under forest can be classified as extremely to strongly acid (Santos et al, 2013c), whereas, under pasture, the soils are less acid, probably due to soil management, as the use of fire for forest removal is very common in this region, and the ashes deposited on the soil elevate the value of pH, which can remain high for decades, as shown by Mcgrath et al (2001), Quesada et al (2010), and Araújo et al (2011).…”

Section: Resultsmentioning

confidence: 99%

“…The focus of other studies has been on changes caused by land use conversion on chemical properties (Mcgrath et al, 2001;Braz et al, 2013), soil C stocks and dynamics Araújo et al, 2011;van Straaten et al, 2015), changes in the quantity and quality of shoot biomass (Fearnside and Barbosa, 1998;Lohbeck et al, 2015), emission of greenhouse gases through burning of forests and/or pastures (Fearnside, 2002;Fujisaki et al, 2015), soil biological activity (Silva et al, 2012;Rodrigues et al, 2013;Cram et al, 2015), reduction in ecosystem services , and negative impacts on the invertebrate communities .…”

Section: Introductionmentioning

confidence: 99%

Characterization and Classification of Soils under Forest and Pasture in an Agroextractivist Project in Eastern Amazonia

Zenero

Silva

Castilho

et al. 2016

Rev. Bras. Ciênc. Solo

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Knowledge of soils in the Amazon rainforest is becoming increasingly essential due to dynamics adopted by farmers that substitute forest for pastures, together with growing pressure from diverse segments of society towards adoption of sustainable production systems. The objective of this study was to characterize the soils along two toposequences, one under forest (F) and the other under pasture (P), and to verify how the change in land use influences soil attributes, evaluating their inclusion in the Brazilian Soil Classification System (SiBCS). The soils were sampled in pits located at the summit, backslope and footslope positions for morphological, chemical, physical, and clay mineralogy analysis. The results show that the soils are chemically poor and predominately kaolinitic. Sandy and loamy sand soils are in the surface horizons, with an increase in clay content with depth. The highest values of bulk density and lowest values of macroporosity were observed in the Bt horizons due to the change from a granular structure in the surface to an angular and subangular blocky structure in these horizons. The morphological properties observed in the field are strongly influenced by the annual soil water dynamics, the parent material, and the landscape, representing diagnostic characteristics that influenced classification of the soils, such as aquic with episaturation (epirredóxico), saprolitic, and gravelly. These diagnostic characteristics in the Argissolo Amarelo (Hapludults) are important morphological properties that have not been highlighted by the current edition of the SiBCS.

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“…The nutrient contents in soils of CLI, CLFI, and PAST systems were higher than in NF, especially in the 0-0.10 m depth range. The concentrations of Ca 2+ and Mg 2+ we measured in the upper 0.4 m of soil would classify this soil as being low to very low, according to the classification proposed by Araújo et al (2011). In these soils, the low cation exchange capacity (CEC) is caused by the predominance of low activity clays, associated with low organic carbon content (SOUZA; MELO, 2003).…”

Section: +mentioning

confidence: 98%

“…This result may be attributed to the greater participation of humin, which represents about 70 % of the TOC. Humin fractions are considered to be the most recalcitrant portions in the soil and so have a higher potential for interaction with its colloidal mineral matrix (ARAÚJO et al, 2011). In addition, the fractions AF and AH are less stable and they are easily mineralized in soil, which reduces their residual content (FONTANA et al, 2006).…”

Section: +mentioning

confidence: 99%

Chemical and physical fractions of soil organic matter under various management regimes in Roraima, Brazil

Guardiola

Júnior

Silva

et al. 2017

SCA

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The crop-livestock integration (CLI) and crop-livestock-forest integration (CLFI) management systems, have been shown to be viable approaches for increasing carbon sequestration in soils, resulting in the improvement of physical and chemical soil attributes. The objective of this study was to evaluate the chemical attributes and organic matter in soils under Natural Forest (NF) converted to different uses and managed differently: rotational pasture area (PAST), crop-livestock integration (CLI), and croplivestock-forest integration (CLIF). The research was conducted at the São Paulo farm, in Iracema, located in the south-central region of the state of Roraima, Brazil. The studied soil type was classified as Ultisol. Soil samples were taken by opening ditches and examining layers at 0.1-m depth intervals from surface to 0.60-m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions, and light organic matter in water were analyzed. Our results showed low levels of the analyzed chemical elements, a characteristic of a soil with low natural fertility. This matches conditions inherent in source material, weathered by high rainfall, a warm and humid climate, and flat topographic relief. In the 0-0.1 m layer, the PAST and CLI systems had the highest TOC contents relative to the other systems studied. At other depths, there were no statistical differences among TOC levels. The highest concentration of C in the particulate fraction (POC) was noted in the surface layer in all management systems. The pasture system had the highest concentration POC in the top 0.10 m. Our results also showed that the upper 0.10 m of soil in NF contained the lowest content of organic carbon associated with mineral (MOC) relative to the managed agrosystems. In addition, humin provided the largest contribution to SOM in all evaluated management systems. The crop-livestock integration (CLI) and crop-livestock integration forest (CLIF) systems, emerged as a strong alternative to carbon incorporation and subsequently the improvement of physical and chemical soil attributes. The objective of this work to evaluate the chemical attributes and organic matter in soils under Natural forest (NF) converted into different use and management systems: pasture (PAST), croplivestock Integration (CLI) and crop-livestock Integration forest (CLIF). The research was conducted at São Paulo farm in Iracema, located in the Center-South region of the State of Roraima, Brazil. The soil studied was classified as Argissolo Amarelo Distrófico. The samples were taken by the opening of trenches in layers of 0-0.10, 0.10-0.20, 0.20-0.40, and 0.40-0.60 m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions and organic matter in water were analyzed. The results showed low levels of the analyzed chemical elements which characterizes soils with low natural fertility, which matches the conditions of the source material, high rain...

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Impacto da conversão floresta - pastagem nos estoques e na dinâmica do carbono e substâncias húmicas do solo no bioma Amazônico

Cited by 52 publications

References 35 publications

Estoque de C e Abundância Natural de 13C em Razão da Conversão de Áreas de Floresta e Pastagem em Bioma Mata Atlântica

Estoque de C e Abundância Natural de 13C em Razão da Conversão de Áreas de Floresta e Pastagem em Bioma Mata Atlântica

Characterization and Classification of Soils under Forest and Pasture in an Agroextractivist Project in Eastern Amazonia

Chemical and physical fractions of soil organic matter under various management regimes in Roraima, Brazil

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