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| Registros recuperados: 108 | |
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| Gowen, Rebecca; Rolfe, John; Donaghy, Peter. |
| The Carbon Farming Initiative (CFI) and other carbon trading programs have been promoted as alternative sources of income for agricultural producers, particularly those on marginal land. This paper presents the results of a bioeconomic model developed to compare the relative returns from a beef enterprise against changing regrowth management practices to sequester additional carbon and sell carbon offsets. The model is constructed based on a 1000 hectare parcel of land in Central Queensland and is calculated for two landtypes; Brigalow and Eucalypt. Assuming zero transaction costs and a 20 year contract period, a carbon-cattle enterprise has higher returns that a cattle-only enterprise at relatively low carbon prices for both land types. However, results... |
| Tipo: Presentation |
Palavras-chave: Carbon; Bioeconomic modelling; Grazing economics; Environmental Economics and Policy; Livestock Production/Industries. |
| Ano: 2012 |
URL: http://purl.umn.edu/124311 |
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| Majkut, Joseph D.; Sarmiento, J. L.; Rodgers, K. B.. |
| Concerted community efforts have been devoted to producing an authoritative climatology of air-sea CO2 fluxes, but identifying decadal trends in CO2 fluxes has proven to be more challenging. The available surface pCO(2) estimates are too sparse to separate long-term trends from decadal and seasonal variability using simple linear models. We introduce Markov Chain Monte Carlo sampling as a novel technique for estimating the historical pCO(2) at the ocean surface. The result is a plausible history of surface pCO(2) based on available measurements and variability inferred from model simulations. Applying the method to a modern database of pCO(2) data, we find that two thirds of the ocean surface is trending toward increasing uptake of CO2, with a mean (year... |
| Tipo: Text |
Palavras-chave: Carbon; Assimilation; LDEO2010; Trend. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40156/38724.pdf |
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| Gomez, E; Millet, B; Picot, B. |
| The Mejean-Perols Lagoon is situated on the French Mediterranean coast. It is a small (747 ha) and shallow (70 cm) lagoon. Some treated effluent from Montpellier flows into this hypereutrophic lagoon. The cartography of C, N and P concentrations in the sediment was studied based on 35 bottom samples. The nitrogen and organic carbon concentrations were more or less homogeneous, the highest concentrations being found in the middle of the lagoon. The phosphate was principally bound onto the sediment in the west zone. The observed distribution was independent of grain size, the distribution of which was rather homogeneous. In this lagoon water circulation is wind induced. Four different water flow structures were observed, as functions of the prevailing winds... |
| Tipo: Text |
Palavras-chave: Sédiment; Lagune côtière; Hydrodynamique; Sels nutritifs; Carbone; Sediment; Coastal lagoon; Hydrodynamics; Nutrients; Carbon. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00325/43642/43247.pdf |
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| Majkut, Joseph D.; Carter, Brendan R.; Froelicher, Thomas L.; Dufour, Carolina O.; Rodgers, Keith B.; Sarmiento, Jorge L.. |
| The Southern Ocean is critically important to the oceanic uptake of anthropogenic CO2. Up to half of the excess CO2 currently in the ocean entered through the Southern Ocean. That uptake helps to maintain the global carbon balance and buffers transient climate change from fossil fuel emissions. However, the future evolution of the uptake is uncertain, because our understanding of the dynamics that govern the Southern Ocean CO2 uptake is incomplete. Sparse observations and incomplete model formulations limit our ability to constrain the monthly and annual uptake, interannual variability and long-term trends. Float-based sampling of ocean biogeochemistry provides an opportunity for transforming our understanding of the Southern Ocean CO2 flux. In this work,... |
| Tipo: Text |
Palavras-chave: Carbon; Southern Ocean; Observational system simulation experiment. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40115/38747.pdf |
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| Thompson, Ian D; Canadian Forest Service; ian.thompson@nrcan.gc.ca; Guariguata, Manuel R.; Center for International Forestry Research (CIFOR); M.GUARIGUATA@CGIAR.ORG; Okabe, Kimiko; FFPRI Tsukuba; kimikook@ffpri.affrc.go.jp; Bahamondez, Carlos; INFOR Valdivia; cbahamon@infor.cl; Nasi, Robert; Center for International Forestry Research (CIFOR); r.nasi@cgiar.org; Heymell, Victoria; FAO Rome; Victoria.Heymell@fao.org; Sabogal, Cesar; FAO Rome; cesar.sabogal@fao.org. |
| Forest degradation is broadly defined as a reduction in the capacity of a forest to produce ecosystem services such as carbon storage and wood products as a result of anthropogenic and environmental changes. The main causes of degradation include unsustainable logging, agriculture, invasive species, fire, fuelwood gathering, and livestock grazing. Forest degradation is widespread and has become an important consideration in global policy processes that deal with biodiversity, climate change, and forest management. There is, however, no generally recognized way to identify a degraded forest because perceptions of forest degradation vary depending on the cause, the particular goods or services of interest, and the temporal and spatial scales considered.... |
| Tipo: Peer-Reviewed Synthesis |
Palavras-chave: Biodiversity; Carbon; Criteria and indicators; Forest degradation; Forest management; Remote sensing. |
| Ano: 2013 |
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| Mondino, Eduardo Ariel; UFRRJ; Tavares, Orlando Carlos Huertas; UFRRJ; Ebeling, Adierson Gilvani; UFRRJ; Figueira, Adriana França; UFRRJ; Quintero, Emmeris Ivan; URRJ; Berbara, Ricardo Luis Louro; UFRRJ. |
| Este estudo teve como objetivo avaliar os efeitos de diferentes sistemas agrícolas na comunidade de nematóides de uma área do Sistema Intergrado de Produção Agroecológica (SIPA) de Seropédica, Estado do Rio de Janeiro. Os tratamentos consistiram nos seguintes cultivos: 1- abacaxi; 2-feijão; 3- consórcio milho/feijão; 4- araruta; 5- pasto sujo e 6- capoeira. Os parâmetros avaliados foram: Abundância relativa, Grupos tróficos, índices de Shannon, Dominância, Equitatividade, IM, IM2-5, e a Análise faunística dos nematóides. A abundância relativa dos nematóides flutuou entre 0,02 e 0,59, o número de gêneros variou entre 4 e 14 e a riqueza acumulada foi de 21 gêneros. 79% dos nematóides encontrados foram fitófagos, 14,5% bacteriófagos, 4,7% onívoros-predadores... |
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Palavras-chave: 5.01.00.00-9 Agronomia bioindicadores; Sistema de cultivo; Nematofauna; Carbono bioindicators; Agricultural systems; Nematofauna; Carbon. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/433 |
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| Delitti,Welington Braz Carvalho; Meguro,Marico; Pausas,Juli Garcia. |
| This work aimed to develop allometric equations for tree biomass estimation, and to determine the site biomass in different "cerrado" ecosystems. Destructive sampling in a "campo cerrado" (open savanna) was carried out at the Biological Reserve of Moji-Guaçu, State of São Paulo, southeastern Brazil. This "campo cerrado" (open savanna) grows under a tropical climate and on acid, low nutrient soils. Sixty wood plants were cut to ground level and measurements of diameter, height and weight of leaves and stems were taken. We selected the best equations among the most commonly used mathematical relations according to R² values, significance, and standard error. Both diameter (D) and height (H) showed good relationship with plant biomass, but the use of these... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allometry; Carbon; Cerrados; Nutrient; Savannas. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000400003 |
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| Virgens, Aline Pereira; Barreto-Garcia, Patrícia Anjos Bittencourt; Paula, Alessandro de; Carvalho, Flávia Ferreira de; Aragão, Mariana de Aquino; Monroe, Paulo Henrique Marques. |
| Estudos sobre quantificação de biomassa florestal na Caatinga ganham importância diante da escassez de informações relacionadas ao tema no bioma e, em particular, no estado da Bahia. Este estudo teve como objetivo avaliar os estoques de biomassa e sua distribuição nos componentes da parte aérea de espécies florestais de maior densidade populacional e o potencial de utilização do fator de expansão de biomassa (FEB) médio para obtenção de estimativas de biomassa aérea em área de Caatinga localizada na Floresta Nacional Contendas do Sincorá, BA. A biomassa foi quantificada pelo método destrutivo. Foram selecionadas e abatidas árvores representativas das nove espécies de maior densidade populacional, distribuídas em três classes diamétricas. As quantidades... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal Floresta nacional; Biomassa acima do solo; Carbono National Forest; Above-ground biomass; Carbon. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1465 |
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| Registros recuperados: 108 | |
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