Carbono orgânico e atributos químicos do solo em áreas florestais

Mafra, Álvaro Luiz; Guedes, Sulamita de Fátima Figueiredo; Filho, Osmar Klauberg; Santos, Júlio César Pires; Almeida, Jaime Antônio de; Rosa, Jaqueline Dalla

doi:10.1590/s0100-67622008000200004

Cited by 33 publications

(47 citation statements)

References 9 publications

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“…In addition to biomass and soil C stock changes (BINC), emissions associated with plantation management were computed, including N fertilizer application, liming and fossil fuel use in machinery operations, based on scientific and technical reports (Gonçalves, 1995;Mafra et al, 2008;VPC, 2008; unpublished data from C.S. Moreira).…”

Section: Avoided Deforestationmentioning

confidence: 99%

Greenhouse gas mitigation options in Brazil for land-use change, livestock and agriculture

Cerri¹,

Bernoux

Maia³

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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National inventories of anthropogenic greenhouse gas (GHG) emissions (implementation of the National Communications) are organized according to five main sectors, namely: Energy, Industrial Processes, Agriculture, Land-Use Change and Forestry (LUCF) and Waste. The objective of this study was to review and calculate the potential of greenhouse gas mitigation strategies in Brazil for the Agricultural and LUCF. The first step consisted in an analysis of Brazilian official and unofficial documents related to climate change and mitigation policies. Secondly, business as usual (BAU) and mitigation scenarios were elaborated for the 2010-2020 timeframe, and calculations of the corresponding associated GHG emissions and removals were performed. Additionally, two complementary approaches were used to point out and quantify the main mitigation options: a) following the IPCC 1996 guidelines and b) based on EX-ACT. Brazilian authorities announced that the country will target a reduction in its GHG between 36.1 and 38.9% from projected 2020 levels. This is a positive stand that should also be adopted by other developing countries. To reach this government goal, agriculture and livestock sectors must contribute with an emission reduction of 133 to 166 Mt CO 2 -eq. This seems to be reachable when confronted to our mitigation option values, which are in between the range of 178.3 to 445 Mt CO 2 -eq. Government investments on agriculture are necessary to minimize the efforts from the sectors to reach their targets. Key words: IPCC, EX-ACT, emission reduction, carbon fixation Opções de mitigação de gases do efeito estufa na mudança do uso da terra, pecuária e agricultura no Brasil RESUMO: Inventários nacionais acerca de emissões de gases do efeito estufa (GEE) (refinamentos das Comunicações Nacionais) são organizadas de acordo com cinco principais setores, a saber: Energia, Processos Industriais, Agropecuária, Mudanças do Uso da Terra e Florestas e Tratamento de Resíduos. O objetivo dessa revisão foi calcular o potencial das estratégias de mitigação de GEE no Brasil para agropecuária e mudança de uso da terra e florestas. A primeira etapa consistiu na análise de documentos oficiais e não-oficiais do Brasil relacionados a mudanças climáticas e políticas de mitigação. O cenário atual, sem adoção de ações mitigadoras (BAU), e os cenários de mitigação foram elaborados para o período 2010-2020. Efetuaram-se os cálculos associados às emissões e remoções de GEE. Adicionalmente, duas estratégias foram utilizadas para destacar e quantificar as principais opções de mitigação: a) seguindo metodologia do IPCC 1996 e b) baseando-se no EX-ACT. Autoridades brasileiras anunciaram que o país buscará reduzir sua taxa de emissão de GEE em 36.1 a 38.9% em relação a 2020. Este é um posicionamento positivo que deve ser adotado por outros países em desenvolvimento. Para alcançar essa meta governamental, os setores agricultura e pecuária devem contribuir reduzindo a emissão em 133 a 166 Mt CO 2 -eq. Tal redução parece ser atingível quando confr...

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Section: Avoided Deforestationmentioning

confidence: 99%

Greenhouse gas mitigation options in Brazil for land-use change, livestock and agriculture

Cerri¹,

Bernoux

Maia³

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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“…The highest TN content was found in the forest area due to the higher deposition of organic material (litterfall), accumulating N on the soil surface as the plant residues are humidified (Mafra et al, 2008). Imbalances in organic residue deposition, and decomposition rate, with a rapid decrease in TN content, were observed in the cultivated areas, depending on the management system used, and its time of implementation (Scholes and Breemen, 1997).…”

Section: Total Nitrogen Contentsmentioning

confidence: 99%

Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional

Santos¹,

Loss²,

Lourenzi³

et al. 2018

Rev. Colomb. Cienc. Hortic.

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Total nitrogen and humic substances in aggregates of soils with onion crops under no-tillage and conventional tillage systems Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional ABSTRACTThe objective of this study was to evaluate the soil total nitrogen (TN), and N contents in humic substances (HS) of the organic matter in aggregates of soils cultivated with onion under no-till system for horticulture (NTSH) and conventional tillage system (CTS), comparing with an area of forest. The evaluated treatments were natural vegetation (control), 100% black oats, 100% rye, 100% oilseed radish, intercrop of oilseed (14%) + rye (86%), intercrop of oilseed (14%) + black oats (86%), area under CTS of onion for ±37 years, and area with secondary forest for ±30 years. Five years after the NTSH implementation, undisturbed soil samples from the layers 0-5 cm, 5-10 cm, and 10-20 cm were collected; these samples presented aggregate sizes between 2.0 mm and 8.00 mm. The TN, and N contents of the HS were subdivided into fulvic acids (N-FA), humic acids (N-HA), and humin (N-HU) fractions. The change from CTS to NTSH increases the TN and N-HU contents in the 0-5 cm soil layer. The intercrop of oats and oilseed radish, used as soil plant cover species in NTSH, presented a greater increase in N-HU (0-20 cm) than the other treatments. Black oats, and natural Onion (Allium cepa L.) crops cover an area of approximately 60,000 ha annually in Brazil, producing approximately 1.6 million t of onion bulbs (IBGE, 2017). The southern region of the country produces 49% of the national production, where the state of Santa Catarina (SC) stands out as the largest national producer since 1990, with a profitable production that has becoming more sustainable due to organic production studies (ACATE, 2014).Soil conventional tillage system (CTS) is the most used system for onion crops in SC, comprising frequent turning of the soil (plowing, harrowing, subsoiling or scarification) in the preparation of the soil of the planting bed (Menezes et al., 2013). This soil preparation increases the occurrence of erosive processes and changes edaphic attributes, decreasing nutrient availability to plants and soil organic matter content (Loss et al., 2015). CTS is an important system for food, fiber and energy production, however, it impacts the soil; thus, the search for soil management and conservation practices has been a constant challenge. No-till system for horticulture (NTSH) has stood out as a promising alternative for onion crops (Menezes et al., 2013). Soil turning in NTSH is done only in the planting line, and cover plants are used for the production and maintenance of plant residues on the soil. This practice maintains or increases the vegetation presented a greater increased in N-HA, and N-FA contents, respectively, in the 10-20 cm layer, than the other treatments in NTSH and CTS. CTS with millet as soil plant cover presented a greater increase in N-FA (0-20 cm) contents tha...

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“…Plantaciones dendroenergéticas establecidas en suelos tradicionalmente agrícolas han aumentado los niveles de materia orgánica del suelo, la calidad de agua, la microflora, la microfauna y la porosidad del suelo; con una consecuente disminución de la compactación (MANN;TOLBERT, 2000). Sin embargo, se ha observado que la remoción de residuos o árboles completos, afecta negativamente los rendimientos (MAFRA et al, 2008) de plantaciones en el corto y mediano plazo (5-30 años), en áreas donde el crecimiento es limitado por nitrógeno (STUPAK et al, 2007) o en sitios con reservas bajas de nutrientes (MAFRA et al, 2008). Debe considerarse también, que en estos cultivos, se han observado altas correlaciones entre los reservorios de N del suelo y los niveles de C entre los 0 y 30 cm de profundidad (SARTORI et al, 2007).…”

Section: Introductionunclassified

Efecto de plantaciones dendroenergéticas en el carbono a nivel de suelo, en dos suelos contrastantes de la región de Biobío, Chile

et al. 2013

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Carbono orgânico e atributos químicos do solo em áreas florestais

Cited by 33 publications

References 9 publications

Greenhouse gas mitigation options in Brazil for land-use change, livestock and agriculture

Greenhouse gas mitigation options in Brazil for land-use change, livestock and agriculture

Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional

Efecto de plantaciones dendroenergéticas en el carbono a nivel de suelo, en dos suelos contrastantes de la región de Biobío, Chile

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