A demanda para fertilizantes em um país em desenvolvimento: o caso de São Paulo, Brasil, 1948-71

Cibantos, Jubert Sanches; Larson, Donald W.

doi:10.1590/s0034-75901974000500004

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Among these impacts, we can infer about the influence of agricultural use of fertilizers, as the synthetic form of it has lower δ 15 N values than the organic type (Bateman and Kelly 2007, Choi et al 2017). Since 1960, the use of synthetic nitrogen fertilizers has been increasing in Brazil (FAO 2019, IFA 2019), wherein the state of São Paulo was already and continues to be an important consumer (Cibantos and Larson 1974, ANDA 2018, IPNI 2019). Although we do not completely understand the effects of anthropogenic nitrogen input on the environment, most of the fertilizers used in agriculture escape to non‐cultivated areas, including forests (Schlesinger 2009), consequently affecting forest organisms.…”

Section: Discussionmentioning

confidence: 99%

Isotopic niches of tropical birds reduced by anthropogenic impacts: a 100‐year perspective

Navarro¹,

Magioli²,

Bogoni³

et al. 2021

Oikos

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The intensification of land-use changes in tropical forests during the 20th century, mainly caused by deforestation for agricultural uses, had an overwhelming influence on bird assemblages. However, how these historical anthropogenic changes have impacted the habitat use and diet of tropical birds is poorly known. Stable isotope analysis (δ 13 C and δ 15 N) can be useful in this regard since it provides information not only on the habitat and food resource use but also insights on the dietary niche of species. Here, we aimed to evaluate whether centenary anthropogenic impacts, mainly caused by changes in landscape composition, have affected the resource and habitat use and isotopic niche width of Neotropical birds in a region that comprises two biodiversity hotspots -the Atlantic Forest and Cerrado in southeastern Brazil. We found that the niche width of all bird guilds (frugivore, granivore, insectivore, nectarivore and omnivore) was largely reduced (28-70%) from the 20th century until recently. This niche width reduction was likely associated with historical anthropogenic impacts (e.g. fragmentation, forest loss and change in agricultural practices), which are responsible for the decrease in the availability of habitat and food resources. Moreover, the mean values of δ 15 N decreased over the years in all bird guilds, which might be attributed to the expansion of agricultural areas and the increase in the use of synthetic nitrogen-based fertilizers. All the analyzed species, even though some of them are diet and habitat generalists, were strongly influenced by centenary anthropogenic actions. Our results show the consequences of human-induced changes in land use on the diet and habitat use of tropical birds that persist in fragmented landscapes, which might compromise their long-term survival and provide useful information to the conservation strategies of bird assemblages in modern landscapes.

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Section: Discussionmentioning

confidence: 99%

Isotopic niches of tropical birds reduced by anthropogenic impacts: a 100‐year perspective

Navarro¹,

Magioli²,

Bogoni³

et al. 2021

Oikos

View full text Add to dashboard Cite

show abstract

“…Among these impacts we can infer about the influence of agricultural use of fertilizers, as through δ 15 N is possible to differentiate the synthetic from the organic, where the former has lower δ 15 N (Bateman andKelly 2007, Choi et al 2017). The use of nitrogen fertilizers in Brazil has been increasing since 1960 (FAO 2019, IFA 2019), as well as direct N2O emissions from synthetic fertilizers (FAO 2019), wherein the state of São Paulo was already an important consumer in the past and continues to be until today (Cibantos andLarson 1974, IPNI 2019). Although we still do not have a complete understanding of the effects of anthropogenic nitrogen input on the environment, it is well known that much of the application in agriculture escapes to other locations, including forests , and consequently to the organisms that live in there.…”

Section: Anthropogenic Impacts On δ 15 N and δ 13 C Meansmentioning

confidence: 99%

Habitat and food resources use by birds in different landscapes of the State of São Paulo: an historical and isotopic approach

Navarro¹

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Poder de compra, preço e consumo de fertilizantes minerais: uma análise para o centro-oeste brasileiro

Ogino

Costa

Popova

et al. 2021

Rev. Econ. Sociol. Rural

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Resumo: Os fertilizantes minerais estão entre insumos de maior contribuição para o aumento da produtividade agrícola no Brasil. No entanto, a dependência de recursos naturais escassos e do uso extensivo de energia para a sua síntese faz com que a produção agrícola seja sensível aos choques de oferta e demanda deste insumo. Diante disso, analisou-se a dinâmica entre a quantidade consumida de fertilizantes minerais, o seu preço e o poder de compra ponderado pela produtividade de produtores do Centro-Oeste – região que apresenta o maior consumo de fertilizantes minerais e que concentra a maior produção agrícola do país. Empregou-se o modelo autorregressivo vetorial estrutural (SVAR) para os fertilizantes nitrogenados, fosfatados e potássicos, isoladamente. Os resultados indicam que a quantidade consumida é a variável mais endógena, e o preço, a mais exógena. As estimativas das funções impulso-resposta mostraram que o grupo dos fertilizantes potássicos apresentou maior sensibilidade da quantidade consumida e o poder de compra face a um choque nos preços. Por outro lado, os fertilizantes nitrogenados apresentaram a maior sensibilidade na quantidade consumida em resposta a um choque no poder de compra ponderado pela produtividade.

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A demanda para fertilizantes em um país em desenvolvimento: o caso de São Paulo, Brasil, 1948-71

Cited by 3 publications

References 4 publications

Isotopic niches of tropical birds reduced by anthropogenic impacts: a 100‐year perspective

Isotopic niches of tropical birds reduced by anthropogenic impacts: a 100‐year perspective

Habitat and food resources use by birds in different landscapes of the State of São Paulo: an historical and isotopic approach

Poder de compra, preço e consumo de fertilizantes minerais: uma análise para o centro-oeste brasileiro

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