Effects of fire on the physicochemical properties of soil in a slash-and-burn agriculture

Thomaz, Edivaldo Lopes; Antoneli, Valdemir; Doerr, Stefan H.

doi:10.1016/j.catena.2014.06.016

Cited by 86 publications

(65 citation statements)

References 33 publications

(50 reference statements)

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“…It is estimated that, in the Brazilian Amazon alone, between 600,000 and 1 million families use them for their subsistence (Tremblay et al, 2015). The systems of coivara (Brazil), milpa (Mexico) and jhum (India), among others, are variations of the same technique (Sánchez, 1982;Kleinman;Pimentel;Bryantc, 1995;Antoneli;Döerr, 2014) (Figure 1), in which the agricultural practices disrupt nutrient cycling, accelerate the mineralization of organic matter, increase greenhouse gas emissions, reduce biological diversity, and increase erosion processes.…”

Section: Ciência E Agrotecnologiamentioning

confidence: 99%

“…Fire changes soil chemical attributes: it increases exchangeable cations and available phosphorus, increases pH, slightly increases total carbon, decreases nitrogen, potassium, iron, aluminum and manganese near the surface, but increases them in subsurface (Kleinman;Pimentel;Bryantc, 1995;Antoneli;Döerr, 2014;Béliveau et al, 2015). Changes in soil physical attributes are due to changes in microbial composition and activity, organic matter transformations, and clay fraction behavior, which modify soil resistance to erosion, depending on other soil properties and vegetation characteristics (Herrick et al, 2018).…”

Section: Ciência E Agrotecnologiamentioning

confidence: 99%

“…The higher the natural soil fertility, the longer the cultivation period can be. But since no fertilizer is applied, soil reserves are rapidly consumed Antoneli;Döerr, 2014;Béliveau et al, 2015;Mukul;Herbohn, 2016). The reduction of this stock depends on the cultivation conditions (Sánchez, 1982).…”

Section: Ciência E Agrotecnologiamentioning

confidence: 99%

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Sustainable productive intensification for family farming in developing tropical countries

et al. 2019

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In the past, agriculture was directed to satisfying human needs. Nowadays, it is directed to meeting the markets, forcing the peasantries to adapt to this condition. As a result, family farmers are multifaceted, incorporating both subsistence and market-oriented production. Traditional farming systems have been challenged since there is a pressure for the intensification of these systems. Then, it is important that scientific research about them goes on to recognize that many family farmers use limited resource bases. However, innovation and intensification are permanent needs of agriculture, although they must be adjusted to different contexts, respecting the cultural legacy of family farmers as a prerequisite for achieving the development. RESUMONo passado, a agricultura era direcionada para satisfazer as necessidades humanas. Hoje em dia, é direcionada para atender os mercados, forçando o campesinato a se adaptar a essa condição. Como resultado, os agricultores familiares se tornaram multifacetados, incorporando tanto a produção de subsistência quanto aquela orientada para o mercado. Os sistemas agrícolas tradicionais foram desafiados, uma vez que existe uma pressão para a intensificação desses sistemas. Então, é importante que a pesquisa científica sobre eles continue para reconhecer que muitos agricultores familiares usam bases de recursos limitadas. Contudo, inovação e intensificação são necessidades permanentes da agricultura, embora elas devam ser ajustadas a diferentes contextos, respeitando o legado cultural dos agricultores familiares como pré-requisito para alcançar o desenvolvimento. Termos para indexação: Sistemas agrícolas; sustentabilidade; agricultor familiar; capitalismo; produção de alimentos.

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Section: Ciência E Agrotecnologiamentioning

confidence: 99%

Section: Ciência E Agrotecnologiamentioning

confidence: 99%

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Sustainable productive intensification for family farming in developing tropical countries

et al. 2019

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“…These mosaics likely indicate different soil burn severities (Vieira et al, 2015). In addition, slash-and-burn produces significant ash quantities (Menzies & Gillman, 2003;Thomaz et al, 2014), and the burn severity on this system can to some extent change the soil color (Ketterings & Bigham, 2000) and soil texture (Ulery & Graham, 1993). Therefore, ash cover with different characteristics may have implications on soil erosion for slash-and-burn agricultural systems.…”

Section: Implications Of Ash Cover On Slash-and-burn Agricultural Sysmentioning

confidence: 99%

Ash Physical Characteristics Affects Differently Soil Hydrology and Erosion Subprocesses

Thomaz

2017

Land Degrad Dev

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After slash‐and‐burn agriculture, topsoil becomes covered by ash layers of various colors. The different colored ashes have particular properties that may affect the hydro‐erosional processes on hillslopes in different ways. In the present study, the effects of black and gray ashes on the hydro‐erosional processes were examined in the context of slash‐and‐burn, and the soil erosion subprocesses responsible for soil loss were identified. Black and gray ashes were collected in the field after two slash‐and‐burn fires. The experiment was conducted in wettable, clay‐textured, brown oxisols. In the laboratory, the ash was spread carefully by hand over a plot of 0·14 m2. Simulated rainfall was discharged from a height of 6 m from the central plot for a period of 30 min with a rainfall intensity of 58 mm h−1. Gray ash reduced infiltration five times more than black ash and four times more than bare soil. The runoff coefficient showed black ash with minor runoff of ~7%, bare soil displayed intermediate runoff of ~12%, and gray ash exhibited the major runoff coefficient of 19%. Gray ash generated six and three and a half times more sediment than black ash and bare soil, respectively. This study determined that soil hydrology is affected more by ash cover than soil loss. Black ash protects against soil erosion and improves soil water infiltration; gray ash dramatically changes the topsoil hydrology and interill erosion processes; and bare soil and soil cover with different ash colors lose soil through different erosion subprocesses. Copyright © 2017 John Wiley & Sons, Ltd.

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“…O fogo é um agente físico importante que pode levar a alterações nas propriedades físicas, químicas e biológicas do solo (THOMAZ et al, 2014). No Brasil, as queimadas são mecanismos muito utilizados na agricultura, tanto na sua forma primitiva, como em sistemas de produção intensificados, atuando no sentido de eliminarem resíduos, pragas ou ainda de renovação de pastos (MIRANDA, 2002).…”

Section: Introductionunclassified

Análise da distribuição de focos de calor no município de Novo Progresso, Pará

et al. 2017

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Resumo: Os incêndios são um dos principais causadores de danos aos ecossistemas florestais. Existem diversas formas de detecção dos focos de calor. Entretanto, para países com grande extensão territorial como o Brasil, é mais eficiente e barato o monitoramento por imagens de satélite. A partir disso, objetivou-se analisar a distribuição de focos de calor no município de Novo Progresso, Pará no período de 2010 a 2015, por meio de dados do monitoramento realizado por satélites de referência pertencentes ao Instituto Nacional de Pesquisas Espaciais. Após a organização das informações obtidas através do Banco de Dados de Queimadas, foram feitas análises dos fatores socioeconômicos e ambientais que intensificam o surgimento de focos de incêndios com o auxílio da literatura científica. Observou-se que os focos se concentraram na região nordeste do munícipio, ao longo da BR-163, apresentando maior ocorrência nos meses de agosto e setembro, o que pode estar relacionado com o período de estiagem do município. Palavras-chave:Focos de Calor; Monitoramento; Distribuição; Satélite; Densidade.Abstract: Fires are a major cause of damage to forest ecosystems. There are several ways of detecting hotspots. However, for countries with a vast territory as Brazil, the monitoring by satellite images is more efficient and cheaper. The aim of this study was to analyze the distribution of hotspots in the county of Novo Progresso, Pará, from 2010 to 2015 through data monitoring performed by reference satellites of the National Institute for Space Research. After organizing the information obtained through the Hotspots Database, analyses of socioeconomic and environmental factors that enhance the appearance of fire outbreaks were made with the assistance of scientific literature. It was observed that the outbreaks are concentrated in the northeastern area of the county along the BR-163, presenting higher occurrence in August and September, which may be related to the drought period of the city.

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Effects of fire on the physicochemical properties of soil in a slash-and-burn agriculture

Cited by 86 publications

References 33 publications

Sustainable productive intensification for family farming in developing tropical countries

Sustainable productive intensification for family farming in developing tropical countries

Ash Physical Characteristics Affects Differently Soil Hydrology and Erosion Subprocesses

Análise da distribuição de focos de calor no município de Novo Progresso, Pará

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