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Registros recuperados: 14
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Avaliação do estoque de carbono do solo em diferentes tipos de manejo. Repositório Alice
CONCEIÇÃO, M. C. G. da; MATOS, E. da S.; BIDONE, E. D.; CORDEIRO, R. C.; RODRIGUES, R. de A. R..
Até o final do século passado, a agricultura cresceu e se desenvolveu baseada na expansão de novas áreas para o cultivo, levando a perda de grandes áreas de florestas nativas e ecossistemas naturais (Alexandratos e Bruinsma, 2003), acarretando na perda de serviços ambientais. De acordo com Lal (2006), aproximadamente metade de todo o COS em áreas manejadas foi perdido nos últimos 200 anos, sendo esta uma das principais causas da degradação e consequente declínio da fertilidade dos solos. Segundo Lal (2004), cerca de 3,3 Pg/ ano de carbono é emitido para a atmosfera devido ao preparo do solo para a produção de alimentos. Conforme descrito por Smith e Gregory (2013b) e Foley et al. (2011), ao mesmo tempo que garantir a segurança alimentar, há uma necessidade...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Carbono no solo; Ilpf; Integração lavoura-pecuária-floresta; Soil carbon; Iclfs; Integrated crop-livestock-forestry systems; Agricultura; Manejo do solo; Agriculture; Soil management.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1086564
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Easy winnings? The economics of carbon sequestration in agricultural soils AgEcon
Kragt, Marit Ellen; Pannell, David J.; Robertson, Michael J..
Paper removed temporarily by authors 11/28/11.
Tipo: Conference Paper or Presentation Palavras-chave: Agriculture; Bio-economic modelling; Greenhouse gases; Soil carbon; Agribusiness.
Ano: 2011 URL: http://purl.umn.edu/100575
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ECONOMICS OF AGRICULTURAL SOIL CARBON SEQUESTRATION IN THE NORTHERN GREAT PLAINS AgEcon
Antle, John M.; Capalbo, Susan Marie; Mooney, Sian; Elliott, Edward T.; Paustian, Keith H..
Under the Kyoto protocol of the United Nations Framework Convention on Climate Change the United States is charged with reducing emissions of greenhouse gases to seven percent below their 1990 levels by the period 2008-2012. These reductions could be met from many industries including agriculture. In this paper, an economic simulation model is linked to the CENTURY ecosystem model to quantify the economic efficiency of policies that might be used to sequester carbon (C) in agricultural soils in the Northern Great Plains region. Model outputs are combined to assess the costs of inducing changes in equilibrium levels of soil C through three types of policies. The first is a CRP-style policy that provides producers with per-acre payments for converting...
Tipo: Conference Paper or Presentation Palavras-chave: Policy design; Economic efficiency; Soil carbon; Sequestration; Valuing soil carbon; Great Plains agriculture; Environmental Economics and Policy; Q2.
Ano: 2000 URL: http://purl.umn.edu/21879
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ECONOMICS OF AGRICULTURAL SOIL CARBON SEQUESTRATION IN THE NORTHERN PLAINS AgEcon
Antle, John M.; Capalbo, Susan Marie; Mooney, Sian; Elliott, Edward T.; Paustian, Keith H..
Under the Kyoto protocol of the United Nations Framework Convention on Climate Change the United States is charged with reducing emissions of greenhouse gases to seven percent below their 1990 levels by the period 2008-2012. These reductions could be met from many industries including agriculture. In this paper, an economic simulation model is linked to an ecosystem model to quantify the economic efficiency of policies that might be used to sequester carbon (C) in agricultural soils in the Northern Plains region. Simulations with the Century ecosystem model show that long-term soil C levels associated with a crop/fallow system are less than those for grass alone, but that soil C levels for grass-clover-pasture are greater than for continuously cropped...
Tipo: Working or Discussion Paper Palavras-chave: Policy design; Economic efficiency; Soil carbon; Sequestration; Valuing soil carbon; Great Plains agriculture; Resource /Energy Economics and Policy; Q2.
Ano: 2000 URL: http://purl.umn.edu/29239
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Elevation and vegetation influences on soil properties in Chilean Nothofagus forests RChHN
DECKER,KELLY L.M; BOERNER,R.E.J.
We measured net nitrogen mineralization, net nitrification, proportional nitrification, and total inorganic nitrogen, available phosphorus, and soil organic carbon in five Andean forested stands in an attempt to resolve the relative influence of elevation and forest canopy composition on soil organic matter and nutrient dynamics in this ecosystem type. Our five forested study sites were within a contiguous Nothofagus forest that ranged from 1,280 to 1,700 m elevation in the central Chilean Andes. The five sites consisted of three single species stands, one each of the low elevation deciduous N. obliqua, the evergreen N. dombeyi, or the high elevation deciduous N. pumilio, as well as two mixed evergreen-deciduous stands. There was no statistically...
Tipo: Journal article Palavras-chave: Chilean Andes; Leaf lifespan; Nitrogen mineralization; Nitrification; Soil carbon.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300003
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Inverting the carbon footprint in Brazilian agriculture: an estimate of the effects of the ABC plan. Repositório Alice
MARTINS, S. C.; ASSAD, E. D.; PAVÃO, E.; LOPES-ASSAD, M. L. R. C..
The Sectoral Plan of Mitigation and Adaptation to Climate Change, drafted in order to consolidate an Economy of Low Carbon Emission in Agriculture (ABC Plan), integrates the commitments made by Brazil to mitigate its emissions of greenhouse gases (GHG). The objective of this study is to estimate GHG emissions produced by the agriculture and livestock sector considering the adoption of three low carbon emission technologies (LCT) ? pasture recovery, integrated crop-livestock systems (ICLS), and integrated crop-livestock-forest systems (ICLFS). The GHG emissions were estimated considering the growth projections of the production of soybean, corn, rice, beans, cotton, wheat, sugarcane and pastures from 2012 to 2023. Two scenarios were considered: I - without...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Emissões de gases de efeito estufa; Mudanças climáticas; Mitigação; Carbono do solo; Plano ABC; Soil carbon; Mitigation; Climate change; Greenhouse gases.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1100241
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REGIONAL ESTIMATION OF SOIL CARBON AND OTHER ENVIRONMENTAL INDICATORS USING EPIC AND I_EPIC AgEcon
Gassman, Philip W.; Campbell, Todd D.; Izaurralde, R. Cesar; Thomson, Allison M.; Atwood, Jay D..
Computer models are important tools for assessing regional carbon sequestration and other environmental impacts of agricultural management practices. The Environmental Policy Integrated Climate (EPIC) model is a very flexible model that has been used to make a wide range of field- and regional-scale environmental assessments. Large regional-scale applications of EPIC and similar models can require thousands of runs, resulting in a huge data management task. To address this problem, the Center for Agricultural and Rural Development (CARD) has developed an interactive EPIC (i_EPIC) software package that provides an automated approach to executing large sets of EPIC simulations. Overviews of both the latest EPIC version and the i_EPIC software package are...
Tipo: Working or Discussion Paper Palavras-chave: Environmental indicators; Modeling; Regional analyses; Software interface; Soil carbon; Environmental Economics and Policy.
Ano: 2003 URL: http://purl.umn.edu/18647
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Review of soil organic carbon measurement protocols: A US and Brazil comparison and recommendation. Repositório Alice
DAVIS, M. R.; ALVES, B. J. R.; KARLEN, D. L.; KLINE, K. L.; GALDOS, M. V.; ABULEBDEH, D..
bitstream/item/171889/1/BRUNO-ALVES-Review-of-Soil-Organic-Carbon-Measurement.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Agricultural land; Agricultural management; Bioenergy; Carbon sequestration; Comparative study; Ethanol life cycle; Maize; Measurement method; Organic carbon; Rooting; Sampling; Soil carbon; Sugar cane; Analysis.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1086747
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Soil organic matter responses to anthropogenic forest disturbance and land use change in the Eastern Brazilian Amazon. Repositório Alice
DURIGAN, M. R.; CHERUBIN, M. R.; CAMARGO, P. B. de; FERREIRA, J. N.; BERENGUER, E.; GARDNER, T. A.; BARLOW, J.; DIAS, C. T. dos S.; DEON, D. S.; OLIVEIRA JUNIOR, R. C. de; CERRI, C. E. P..
Anthropogenic forest disturbance and land use change (LUC) in the Amazon region is the main source of greenhouse gas emissions to the atmosphere in Brazil, due to the carbon (C) and nitrogen (N) emitted from vegetation clearance. Land use conversion associated with management practices plays a key role in the distribution and origin of C in different soil organic matter (SOM) fractions. Here, we show how changing land use systems have influenced soil C and N stocks, SOM physical fractions, and the origin of SOM in the Santarém region of the eastern Brazilian Amazon. Soil C and N stocks were calculated for the surface layer of 0?30 cm. Anthropogenic disturbances to the standing forest, such as selective logging and wildfires, led to significant declines in...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Manejo de solo; Uso do solo; Sequestro de carbono; Efeito estufa; Mudança climática; Mitigação; Floresta; Pastagem; Solo; Matéria orgânica; Carbono; Tropical forests; Pasture; Cropland; Soil carbon.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068095
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Spatial and spectral models of soil carbon at multiple scales in Florida. Repositório Alice
VASQUES, G. de M..
1 Introduction 2 Comparison of multivariate methods for inferential modeling of soil carbon using visible/near-injfrared spectra. 3 Modeling of soil organic carbon fractions using visible/near-infrared spectroscopy. 4 Building a spectral library to estimate soli organic carbon in Florida. 5 Regional modeling of soil carbon at multiple depths within a subtropical watershed. 6 Upscaling of dynamic soil organic carbon pools in a north- central Florida watershed. 7 Influence of grain, extent, and geographic region on soil carbon models in Florida, USA. 8 Multi-scale behavior of soil carbon at nested regions in Floirda, USA. 9 Synthesis and outlook List of references Biographical sketch
Tipo: Tese/dissertação (ALICE) Palavras-chave: Carbon; Soil carbon; Soil organic.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/933424
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Spatially-explicit and spectral soil carbon modeling in Florida. Repositório Alice
GRUNWALD, S.; MYERS, D.; VASQUES, G. de M.; XIONG, X.; ROSS, C.; CHAIKAEW, P.; STOPPE, A.; KNOX, N.; COMERFORD, N.; HARRIS, W..
Profound shifts have occurred over the last three centuries in which human actions have become the main driver to global environmental change. In this new epoch, the Anthropocene, human-driven changes such as population growth, climate and land use change, are pushing the Earth system well outside its normal operating range causing severe and abrupt environmental change. In this context, we present research highlights from Florida (150,000 km2) showing how anthropogenic-induced changes have had major impacts on carbon dynamics in soils, including (i) modeling of carbon and nutrient dynamics and soil carbon sequestration impacted by climate and land use change; (ii) geospatial assessment of soil carbon stocks and pools, and (iii) spectral-based soil carbon...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Spectral; Soil carbon.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/920003
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The Agricultural Policy Environmental EXtender (APEX) Model: An Emerging Tool for Landscape and Watershed Environmental Analyses AgEcon
Gassman, Philip W.; Williams, Jimmy R.; Wang, Xiuying; Saleh, Ali; Osei, Edward; Hauck, Larry M.; Izaurralde, R. Cesar; Flowers, Joan D..
The Agricultural Policy Environmental eXtender (APEX) model was developed by the Blacklands Research and Extension Center in Temple, Texas. APEX is a flexible and dynamic tool that is capable of simulating a wide array of management practices, cropping systems, and other land use across a broad range of agricultural landscapes, including whole farms and small watersheds. The model can be configured for novel land management strategies, such as filter strip impacts on pollutant losses from upslope cropfields, intensive rotational grazing scenarios depicting movement of cows between paddocks, vegetated grassed waterways in combination with filter strip impacts, and land application of manure removal from livestock feedlots or waste storage ponds. A...
Tipo: Report Palavras-chave: APEX; Best management practices; Farm and watershed simulations; Soil carbon; Water quality; Environmental Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/49156
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The effect of soil quality on fertilizer use rates among smallholder farmers in western Kenya AgEcon
Marenya, Paswel Phiri; Barrett, Christopher B..
Studies of fertilizer use in sub-Saharan Africa have been dominated by analyses of economic and market factors having to do with infrastructure, institutions, and incentives that prevent or foster increased fertilizer demand, largely ignoring how soil fertility status conditions farmer demand for fertilizer. We apply a switching regression model to data from 260 farm households in western Kenya in order to allow for the possibility of discontinuities in fertilizer demand based on a soil carbon content (SCC) threshold. We find that the usual factors reflecting liquidity and quasi-fixed inputs are important on high-SCC plots but not on those with poorer soils. External inputs become less effective on soils with low SCC, hence the discernible shift in...
Tipo: Conference Paper or Presentation Palavras-chave: Fertilizer demand; Fertilizer policy; Soil carbon; Soil organic matter; Switching regression; Agricultural and Food Policy; Crop Production/Industries; Q12; Q18; Q24.
Ano: 2009 URL: http://purl.umn.edu/51671
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The Optimal Length of an Agricultural Carbon Contract AgEcon
Gulati, Sumeet; Vercammen, James.
In this paper we present the economic determinants of the optimal length of a carbon offset contract. We find that because of a declining capacity of the soil to sequester carbon, the optimal length of the carbon contract is finite (the marginal benefit of remaining in the contract is declining over time, whereas marginal opportunity cost is rising). We also explore the effect of varying key parameter values on the optimal length in the contract. If the contract requires the farmer to sequester at a higher rate, the farmer chooses the contract for a shorter length of time, and this may decrease rather than increase social welfare. If society places a higher value on carbon accumulation, the contract is chosen for a longer length of time. Finally, if both...
Tipo: Working or Discussion Paper Palavras-chave: Carbon offset contracts; Greenhouse gas policy; Soil carbon; Environmental Economics and Policy; Farm Management; Q200; Q580.
Ano: 2005 URL: http://purl.umn.edu/37027
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