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Registros recuperados: 16
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Balanço e emissões de gases de efeito estufa em sistemas integrados. Repositório Alice
OLIVEIRA, P. P. A.; PEZZOPANE, J. R. M.; MEO FILHO, P. de; BERNDT, A.; PEDROSO, A. de F.; BERNARDI, A. C. de C..
In the context of global warming and climate changes, livestock production systems may be beneficial or prejudicial to the environment considering they can act as sinks or sources of greenhouse gases - GHG. This makes the carbon - C - balance a fundamental tool in the evaluation of these systems. Carbon balance results must be compared with caution due to differences in the calculus methodology and in the range of processes considered for the anthropic emissions and sequestrations of C. Generally, degraded pastures are not able to neutralize GHG emissions by C sequestration in the soil while intensive pasture systems, integrated or not, have the potential to mitigate GHG and neutrale beef C footprint, generating C credits. Integrated systems have an...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Livestock; Integrated systems; Climate changes.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1082580
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Carbon footprint of the colombian cocoa production REA
Ortiz-Rodríguez,Oscar O.; Villamizar-Gallardo,Raquel A.; Naranjo-Merino,Carlos A.; García-Caceres,Rafael G.; Castañeda-galvís,María T..
ABSTRACT Cocoa is an important commercial crop in the tropics; and estimating the carbon emissions in the producing-areas is a worthwhile effort. The main goal of the current paper was to evaluate the carbon footprint (CF) per kilogram of Colombian cocoa bean produced under conventional and agroforestry managements, following the methods proposed by PAS 2050. In this research, we compared our results to other worldwide researches, showing an overview of the current limitations and challenges involving the CF researches. Our results showed that all calculated environmental burdens were lower for the conventional management. In the agroforestry practice, composting of cocoa pod husks contributed with approximately 34.00E+00 g methane and 2.55E+00 g nitrous...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbon footprint; Climate changes; Global warming potential; Theobroma cacao L.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000200260
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Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects. Repositório Alice
PITOMBO, L. M.; CARMO, J. B.; DE MARIA, I. C.; ANDRADE, C. A. de.
Abstract: The large volume of sewage sludge (SS) generated with high carbon (C) and nutrient content suggests that its agricultural use may represent an important alternative to soil carbon sequestration and provides a potential substitute for synthetic fertilizers. However, emissions of CH4 and N2O could neutralize benefits with increases in soil C or saving fertilizer production because these gases have a Global Warming Potential (GWP) 25 and 298 times greater than CO2, respectively. Thus, this study aimed to determine C and N content as well as greenhouse gases (GHG) fluxes from soils historically amended with SS. Sewage sludge was applied between 2001 and 2007, and maize (Zea mays L.) was sowed in every year between 2001 and 2009. We evaluated three...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Adubo de esgoto; Lodo residual; Impacto ambiental; Clima; Dióxido de Carbono; Nitrogênio; Sewage sludge; Environmental impact; Climate changes; Carbon dioxide; Nitrogen; Nitrous oxide; Methane; Biosolids.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1010402
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Different physiological responses under drought stress result in different recovery abilities of two tropical woody evergreen species Acta Botanica
Frosi,Gabriella; Harand,Wolfgang; Oliveira,Marciel Teixeira de; Pereira,Silvia; Cabral,Simone Pereira; Montenegro,Abelardo Antônio de Assunção; Santos,Mauro Guida.
ABSTRACT The effects of water deficit on physiological and biochemical variables of young plants of two tropical woody species, Pachira aquatica and Sterculia foetida, and their recovery abilities were measured. Leaf water potential, gas exchange and selected carbon metabolism components were measured in a greenhouse experiment with control, moderate and severe water deficit treatments. Under severe drought stress, gas exchange and chlorophyll fluorescence decreased in both species compared to their respective controls. After rehydration, P. aquatica and S. foetida showed a partial and full recovery of the measured variables, respectively. In addition, a decrease and an increase in photosynthetic pigments were observed for P. aquatica and S. foetida,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll fluorescence; Climate changes; Gas exchange; Semiarid; Water deficit.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200153
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Effects of an atypical drought on the benthic macroinvertebrate community in a tropical reservoir Biota Neotropica
Anacléto,Maria José Pinheiro; Ligeiro,Raphael; Barbosa,José Etham de Lucena; Molozzi,Joseline; Callisto,Marcos.
Abstract Atypical drought events have increasingly occurred in Brazil over the last years due to global climate changes. However, their consequences on aquatic biota in reservoirs are poorly known. We tested the hypothesis that macroinvertebrate communities are negatively affected by atypical drought events, given the sensitivity of many taxa to environmental changes. We predicted that: (a) there would be changes in limnological and sediment parameters between a regular year and an atypical year, (b) abundance and richness of the genera of Chironomidae and of exotic species would be higher due to the enhanced ability of these organisms to adapt to changes in the physical environment, and (c) community structure metrics (i. richness; ii. % richness; iii....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic fauna; Exotic species; Ecological integrity; Water stress; Climate changes.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000200205
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Fishes of the Amazon: diversity and beyond Anais da ABC (AABC)
VAL,ADALBERTO LUIS.
Abstract: The Amazon basin houses a particular group of freshwater organisms, whose study tells the geological history of the region, how biological diversity was shaped, how it is maintained, and what it hides. The fish of the Amazon is represented by more than 3,000 known species distributed from the basal groups up to the more specialized ones. This species richness hides a diversity of adaptations that are dispersed at all levels of the biological organization. In this summary of the conference delivered at the Brazil-France Bilateral Symposium, held in Manaus in 2018, we describe two aspects of the hidden world of adaptive diversity: adaptations to changes in dissolved oxygen and the abilities of the Rio Negro fish to face acidic and ion-poor waters...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazonia; Biodiversity; Adaptations; Hypoxia; Dissolved organic carbon; Climate changes.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600602
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Future irrigation water requirements in the Ijuí River basin, RS AGRIAMBI
Silva,Kayoma K. da; Siqueira,Tirzah M.; Adam,Katiucia N.; Castro,Andréa S.; Corrêa,Luciara B.; Leandro,Diuliana.
ABSTRACT Changes in temperature and precipitation intensity and frequency have influenced the water demand for irrigation. Regions that have agriculture-based economies, as in the Ijuí River basin, are often affected by periods of drought or excessive rainfall, which is harmful for agricultural productivity. This study aimed to evaluate future irrigation water demands of four crops in this basin (bean, corn, wheat and soybean), comparing them with a baseline period. Meteorological data forecasts were obtained from the regional climate model ETA 40 CTRL for the climatic scenario A1B, for the baseline (1961-1990) and future (2011-2100) periods. The one-dimensional SWAP model was used to estimate the water demand for irrigation. The results showed that, in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Climate changes; Agriculture; SWAP model.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100057
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Impact of small variations in temperature and humidity on the reproductive activity and survival of Aedes aegypti (Diptera, Culicidae) Rev. Bras. entomol.
Costa,Ethiene Arruda Pedrosa de Almeida; Santos,Eloína Maria de Mendonça; Correia,Juliana Cavalcanti; Albuquerque,Cleide Maria Ribeiro de.
In short space of time increase in temperature and rainfall can affect vector populations and, consequently, the diseases for them transmitted. The present study analyzed the effect of small temperature and humidity variations on the fecundity, fertility and survival of Aedes aegypti. These parameters were analyzed using individual females at temperatures ranging from 23 to 27 °C (mean 25 °C); 28 to 32 °C (mean 30 °C) and 33 to 37 °C (mean 35 ºC) associated to 60±8% and 80±6% relative humidity. Females responded to an increase in temperature by reducing egg production, oviposition time and changing oviposition patterns. At 25 ºC and 80% relative humidity, females survived two-fold more and produced 40% more eggs when compared to those kept at 35 ºC and 80%...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Climate changes; Dengue; Fecundity; Fertility; Mosquito.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000300021
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Impacto das mudanças climáticas na evapotranspiração em nível de Bacia Hidrográfica utilizando um Sistema de Informações Geográficas. Repositório Alice
GONDIM, R. S.; FUCK JÚNIOR, S. C. de F.; EVANGELISTA, S. R. M.; CASTRO, M. A. H. de; TEIXEIRA, A. dos S..
RESUMO - As mudanças climáticas têm potencial de alterar os processos do ciclo hidrológico, tais como precipitação que afeta o escoamento superficial, temperatura e umidade relativa que possuem estreita relação com evaporação e vazão em corpos hídricos e evapotranspiração das plantas. Um conjunto de dados composto de uma baseline (climatologia de base) do modelo de 1961-1990 e projeções climáticas foram rodados (anos de 2025 a 2055, representadas pelo ano de 2040). Os dados foram então extraídos, considerando-se as coordenadas geográficas da região em estudo, com resolução de 0,44ºx 0,44º, gerando-se então, as quadrículas para cada variável, a fim de abranger toda a região estudada. A evapotranspiração de referência (ETo) foi estimada, através de dados da...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Mudanças climáticas; Evapotranspiração; Climate changes; Evapotranspiration.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/898150
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Influences of two CO2 concentrations and water availability on bean crop REA
Silva,João B. L. da; Ferreira,Paulo A.; Pires,Luanna C.; Pereira,Eduardo G.; Carneiro,José E. S..
This study was carried out to determine some physiological and phenological responses of the bean under high [CO2] and drought stress. The experiment was conducted from April to July 2009 in Viçosa, Brazil. The open-top chambers were used to enrich the air with CO2, whereas the drought stress was applied between the flowering and the ripening. The randomized block design was used, with four replicates in the subplots. The following plots were [CO2] at 700ppm (F1) and [CO2] environmental (F2) and the subplots were well watering (S1) and drought stress (S2). The results were subjected to Anova and the Tukey test (P < 0.05). For the treatments F1S1 and F1S2 the photosynthetic rate showed increments of 59% and the transpiration reduction of 12%. The yield,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosynthesis; Phaseolus vulgaris L.; Climate changes.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400012
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Mortality prediction of laying hens due to heat waves Rev. Ciênc. Agron.
Riquena,Rodrigo da Silva; Pereira,Danilo Florentino; Vale,Marcos Martinez do; Salgado,Douglas D'Alessandro.
ABSTRACT Mortality in the production of laying hens is a concern for producers and constitutes a considerable economic loss. Some climatic events, such as heat waves, are directly related to the mortality increasing. The aim of this study was to relate the occurrence of heat waves with laying hens mortality, considering the effect of two different kinds of shed used in egg production. Daily mortality data were obtained from two aviaries located in the city of Bastos-SP for the period of October 2014 to January 2016. The data about the climate were gotten from two meteorological stations located in the cities of Tupã-SP and Rancharia-SP, Brazil, from 2010 to 2015. The heat waves were classified in the climatic database using different definitions...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Data mining; Poultry farming; Climate changes; Animal husbandry.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000100018
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Pedological and isotopic relations of a highland tropical peatland, Mountain Range of the Espinhaço Meridional (Brazil) Rev. Bras. Ciênc. Solo
Horák,Ingrid; Vidal-Torrado,Pablo; Silva,Alexandre Christófaro; Pessenda,Luiz Carlos Ruiz.
The evolution of organic matter sources in soil is related to climate and vegetation dynamics in the past recorded in paleoenvironmental Quaternary deposits such as peatlands. For this reason, a Histosol of the mineralotrophic peatland from the Pau-de-Fruta Special Protection Area - SPA, Espinhaço Meridional, State of Minas Gerais, was described and characterized to evidence the soil constituent materials and properties as related to changes in environmental conditions, supported by the isotopic and elementary characterization of soil C and N and 14C ages. Samples were collected in a depression at 1,350 m asl, where Histosols are possibly more developed due to the great thickness (505 cm). Nowadays, the area is colonized by vegetation physiognomies of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paleoenvironmental reconstruction; Decomposition of organic matter; Pedogenesis of Histosols; Climate changes; Sapric soils.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000100004
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Produção de matéria seca e fisiologia em meloeiro submetido ao estresse hídrico em região Semiárida. Repositório Alice
VIEIRA, D. A.; CARVALHO, M. M. P.; AIDAR, S. de T.; MARINHO, L. B.; MESQUITA, A. de C..
As mudanças climáticas têm contribuído com a escassez hídrica e por isso o presente trabalho têm como objetivo avaliar o comportamento fisiológico em tipos de meloeiro submetido ao estresse hídrico. O estudo foi realizado no período de outubro a dezembro de 2015 em ambiente protegido na área experimental da Universidade do Estado da Bahia, no Submédio do Vale do São Francisco, município de Juazeiro BA (9° 24 S; 40° 30 W; 368 m de altitude. Para o estudo com o melão, utilizou-se os tipos melão amarelo e pele de sapo, híbridos Mandacaru e Juazeiro, respectivamente. O delineamento experimental foi em blocos ao acaso com três repetições, em esquema de parcelas sub-subdivididas, onde as parcelas foram compostas pelas quatro lâminas de irrigação(50, 75, 100 e...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Estresse hídrico; Ajuste fotossintético; Mudanças Climáticas; Climate changes; Melon; Melão; Solo; Fisiologia; Cucumis Melo; Matéria Seca.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1085133
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The changing rates and patterns of deforestation and land use in Brazilian Amazonia. Repositório Alice
ALVES, D. S.; MORTON, D. C.; BATISTELLA, M.; ROBERTS, D. A.; SOUZA JR, C..
Investigating the rates and patterns of land cover and land use change (LCLUC) in Amazonia is a central issue for Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) research. LCLUC, along with climatic changes affects the biological, chemical, and physical functions of Amazonia, thereby linking environmental chance at the local, regional, and global scales. Considerable research has focused on estimating rates of forest conversion in Amazonia, mainly through the use of satellite remote sensing and evaluating factors that influence these rates, Beyond the rates of forest loss, LCLUC research in Amazonia has also considered the variety of agricultural uses that reokace firest civer, forest degradation from logging and fire, and secondary...
Tipo: Capítulo em livro científico (ALICE) Palavras-chave: Amazonia; Climate changes; LBA; Vegetation; Global scales.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/663199
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Water and small ruminant production R. Bras. Zootec.
Araújo,Gherman Garcia Leal de; Voltolini,Tadeu Vinhas; Chizzotti,Mario Luiz; Turco,Silvia Helena Nogueira; Carvalho,Francisco Fernando Ramos de.
Water is a nutrient of extreme importance for animals and must be considered vital in any rearing phase. The increasing scarcity of this precious natural resource has concerned different segments of society in order to find solutions for rational and sustainable use of this nutrient. Small ruminants, especially sheep and goats, have social and economic importance due to their great ability in adapting to adverse environmental conditions and using water efficiently. Thus, they might be a good alternative to mitigate the climate change effects and to generate foreign exchange and improving life condition in many places of the world. The concept of water productivity for livestock production is relatively new and there are few studies in the world, especially...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Climate changes; Goat; Salinity; Sheep; Water balance.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300036
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การเปลี่ยนแปลงสภาพภูมิอากาศกับสวัสดิภาพของสัตว์ Thai Agricultural
Pipat Somparn.
Tipo: Collection Palavras-chave: Animal husbandry; Animal hygine; Animal behavior; Climate changes; Animal welfare; การเลี้ยงสัตว์; สุขศาสตร์สัตว์; สุขภาพสัตว์; พฤติกรรมสัตว์; สวัสดิภาพสัตว์; การเปลี่ยนแปลงสภาพภูมิอากาศ.
Ano: 2012 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5280
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