Carbon Sinks
Mostrando 1-12 de 25 artigos, teses e dissertações.
-
1. Vegetation structure, carbon sequestration potential and species conservation in four agroforestry systems in Cameroon (Tropical Africa)
ABSTRACT As the rate of forest degradation continues to rise, agroforestry may serve as a way of conserving species and carbon sinks. The aim of this study was to assess agrobiodiversity and carbon sequestration potential in agrosystems in Cameroon. Three age groups of agrosystems were studied. Data were collected in 100x50 m2 quadrates. Density ranged from
Acta Bot. Bras.. Publicado em: 15/01/2018
-
2. Neuro estimador para o fluxo de gases entre a superfície terrestre e a atmosfera / A neuro estimator for the flux of gases between the surface land and the atmosphere
Studies show that global warming may be irreversible in the medium or long term, and is a major cause of air pollution. However, this framework can be reversed or mitigated by estimating the amount of emissions, since the mapping of pollution sources could facilitate the work of public authorities in relation to environmental monitoring and the development o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
-
3. Organic carbon pools in a luvisol under agroforestry and conventional farming systems in the semi-arid region of Ceará, Brazil.
Many environmental benefits have been attributed to agroforestry systems in various ecosystems around the world. However, there is a limited amount of information to evaluate this agricultural system in the semi-arid region, specifically in the region of Ceara´, Brazil. The objective of this work was to evaluate five agricultural (four agroforestry and one
Agroforestry Systems. Publicado em: 2011
-
4. Carbon and nitrogen stocks and greenhouse gases emissions from sugarcane areas in the Piracicaba region / Estoques de carbono e nitrogênio e emissões de gases do efeito estufa em áreas de cana-de-açúcar na região de Piracicaba
Concentrations of greenhouse gases (GHG), such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), have increased since Industrial Revolution and the agricultural sector significantly contributes to the mentioned increase. Soils are important sinks of carbon (C) and nitrogen (N) and management practices could release part of these pools to the at
Publicado em: 2010
-
5. Precipitação de CaCO3 em algas marinhas calcárias e balanço de CO2 atmosférico: os depósitos calcários marinhos podem atuar como reservas planetárias de carbono? / CaCO3 precipitation in marine calcareous seaweeds and the atmospheric CO2 concentration: can the marine calcareous deposits act as planetary carbon sinks?
Human activities over the last two centuries provoked an increase in the concentration of carbon dioxide (CO2) in the atmosphere. One of the effects of this increase is an increment in the primary production of some terrestrial plants which in this way act carbon sinks. In the oceans the CO2 is stored mainly as calcium carbonate (CaCO3). An increase in the c
Publicado em: 2007
-
6. VariaÃÃo sazonal da atividade da rubisco e das enzimas de sÃntese e hidrÃlise da sacarose em plantas de seringueira [Hevea brasiliensis (Willd ex. Adr de Juss.) Muell.-Arg], em Lavras/MG / Seasonal variation of Rubisco and sucrose synthesis and hydrolisys enzymes activities in rubber trees [Hevea brasiliensis (Willd ex. Adr. de Juss.) Muell.-Arg], in Lavras, MG.
The growth of rubber tree cultivation in Brazil has happened because of growing of natural rubber market. With aim to escape of âSouth American leaf blightâ â a common disease in amazonian region â the rubber tree expansion has privileged no traditional regions in Brazil. In Minas Gerais, where rubber tree cultivation is still incipient, new researches a
Publicado em: 2007
-
7. Mécanismes de convergence des intérêts dans les négociations internationales sur lenvironnement : une comparaison entre négociations sur la protection des forêts et celles sur le climat.
The thesis aims at analysing the mechanisms underlying the representation of countries interests and also their participation in the international environmental negotiations, namely in a North South negotiation context. In the first part of the thesis, two theoretical frameworks are employed, in order to clarify the engagement of countries in these negotiati
Publicado em: 2001
-
8. A large carbon sink in the woody biomass of Northern forests
The terrestrial carbon sink, as of yet unidentified, represents 15–30% of annual global emissions of carbon from fossil fuels and industrial activities. Some of the missing carbon is sequestered in vegetation biomass and, under the Kyoto Protocol of the United Nations Framework Convention on Climate Change, industrialized nations can use certain fores
The National Academy of Sciences.
-
9. An isotopic approach for understanding the CH3Br budget of the atmosphere
The atmospheric budget of methyl bromide (CH3Br), an ozone-depleting gas, is highly uncertain, because it has complex sources and sinks. Although oceans, biomass burning, and industrial production are identified as the major sources, the fraction of CH3Br that is contributed by each source is not well known. A mass-balance approach that exploits differe
The National Academy of Sciences.
-
10. The Differential Expression of Sucrose Synthase in Relation to Diverse Patterns of Carbon Partitioning in Developing Cotton Seed.
Developing cotton (Gossypium hirsutum L.) seed exhibits complex patterns of carbon allocation in which incoming sucrose (Suc) is partitioned to three major sinks: the fibers, seed coat, and cotyledons, which synthesize cellulose, starch, and storage proteins or oils, respectively. In this study we investigated the role of Suc synthase (SuSy) in the mobilizat
-
11. Intracellular Carbon Partitioning in Chlamydomonas reinhardtii1
Using enzymic and isotope techniques the intracellular partitioning of newly fixed carbon was studied in synchronized cells of Chlamydomonas reinhardtii. Starch and growth metabolism, i.e. the use of carbon in biosynthesis, were found to be the major sinks for photosynthetically fixed carbon in the alga. Sucrose does not accumulate in significant quantities.
-
12. Photoperiodic and Genetic Control of Carbon Partitioning in Peas and Its Relationship to Apical Senescence 1
Apical senescence but not flower initiation is delayed by short days (SD) compared to long days (LD) in pea plants (Pisum sativum L.) of genotype E Sn Hr. We recently reported that delay of senescence correlated with slower reproductive development, suggesting that fruits are weaker sinks for assimilates under delayed senescence conditions. Thus, we have exa