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| Registros recuperados: 20 | |
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| 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: Separatas |
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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| 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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| Chalk,Phillip Michael. |
| Abstract Brazilian scientists have played a pioneering role in developing and applying stable isotope methodologies, in terms of natural abundance and enriched levels, to trace carbon and nutrient flows in terrestrial ecosystems, including natural and agroecosystems. Significant contributions have been made in the areas of biological N2 fixation, carbon dynamics in soil, synthesis and evaluation of labeled fertilizers, and food science. These contributions have originated from several decentralized units of Embrapa, from research institutions, and from federal or state universities. In order to capitalize the existing Brazilian expertise, it is necessary to provide, at an institutional level, analytical facilities for stable isotope research, aiming to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological N2 fixation; Fertilizer use efficiency; Food science; Labeled fertilizer; Soil carbon; Stable isotopes. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901039 |
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| VASQUES, G. de M.; GRUNWALD, S.; MYERS, D. B.. |
| Understanding the causes of spatial variation of soil carbon (C) has important implications for regional and global C dynamics studies. Soil C predictive models can identify sources of C variation, but may be influenced by scale parameters, including the spatial extent and resolution of input data. Our objective was to investigate the influence of these scale parameters on soil C spatial predictive models in Florida, USA. We used data from three nested spatial extents (Florida, 150,000 km2; Santa Fe River watershed, 3,585 km2; and University of Florida Beef Cattle Station, 5.58 km2) to derive stepwise linear models of soil C as a function of 24 environmental properties. Models were derived within the three extents and for seven resolutions (30?1920 m) of... |
| Tipo: Artigo de periódico |
Palavras-chave: Soil carbon; Soil carbon models. |
| Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/938847 |
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| 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 de periódico |
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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| Tirloni,Carolina; Vitorino,Antonio Carlos Tadeu; Bergamin,Anderson Cristian; Souza,Luiz Carlos Ferreira de. |
| Crop-livestock integration represents an interesting alternative of soil management, especially in regions where the maintenance of cover crops in no-tillage systems is difficult. The objective of this study was to evaluate soil physical and chemical properties, based on the hypothesis that a well-managed crop-livestock integration system improves the soil quality and stabilizes the system. The experiment was set up in a completely randomized design, with five replications. The treatments were arranged in a 6 x 4 factorial design, to assess five crop rotation systems in crop-livestock integration, and native forest as reference of soil undisturbed by agriculture, in four layers (0.0-0.05; 0.05-0.10; 0.10-0.15 and 0.15-0.20 m). The crop rotation systems in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop rotation; No-tillage system; Soil quality; Soil carbon; Aggregate stability. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400024 |
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| SAITO, M.; NOVOTNY, E. H.; CHEN, Y.. |
| As global warming progresses, concerns also arise regarding the decline in agricultural productivity and soil degradation. On the other hand, the demand for food is increasing as the population grows, and the maintenance and enhancement of soil productivity to support this demand are becoming important global issues. Soil carbon (C), in particular, plays a crucial role not only in maintaining soil fertility but also as a global C sink. Soil C is a complex product resulting from various biological, physical, and chemical processes, and it is a fragile entity that is vulnerable to inappropriate human activity and global climate change. Soil microbes with efficient C use help reduce C losses and increase C storage. In this context, it is essential to... |
| Tipo: Artigo de periódico |
Palavras-chave: Soil carbon; Ecossistema; Agricultura; Carbono; Solo; Agroecosystems. |
| Ano: 2023 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1157166 |
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| 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: Teses |
Palavras-chave: Soil carbon; Soil organic.; Carbon.. |
| Ano: 2009 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/933424 |
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| 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: Separatas |
Palavras-chave: Spectral; Soil carbon. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/920003 |
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| 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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| 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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| TÁVORA, G. S. G.; TURETTA, A. P. D.; SILVA, A. S. da; SIMÕES, B. F. T.; NEHREN, U.. |
| In recent years, numerous studies have addressed the theme of ecosystem services as a means of promoting the protection, sustainable use, and recovery of ecosystems. However, these studies mainly have not been fully evaluated the soil-related ecosystem services and the different land uses and land cover. Taking this as a background, our main goal is to evaluate the trade-offs and synergies in the provision of soil-related ecosystem services in a watershed located in the highlands of Rio de Janeiro state - Brazil. To do so, we evaluated soil properties as indicators. In addition, statistical methods were applied to analyze any significant differences between the variables for the different land use classes, and Spearman correlation matrix to evaluate the... |
| Tipo: Artigo de periódico |
Palavras-chave: Nutrients regulation; Soil carbon; Carbono do solo; Propriedades do solo; Regulação de nutrientes; Uso da Terra; Agricultura Sustentável; Soil properties; Land use; Sustainable agriculture. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1146606 |
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| Registros recuperados: 20 | |
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