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Registros recuperados: 14
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A potential nutritional modifier for predicting primary productivity of Pinus radiata in New Zealand using a simplified radiation-use efficiency model Ciencia e Investigación Agraria
Bown,Horacio E; Mason,Euan G; Watt,Michael S; Clinton,Peter W.
H.E. Bown, E.G. Mason, M.S. Watt, and P.W. Clinton. 2013. A potential nutritional modifier for predicting primary productivity of Pinus radiata in New Zealand using a simplified radiation-use efficiency model. Cien. Inv. Agr. 40(2): 361-374. The 3-PG (Physiological Principles in Predicting Growth) radiation-use efficiency model has been widely used and tested for predicting the primary productivity of forests all over the world. This radiation-use efficiency model accounts for plant nutrition through a user-defined dimensionless fertility parameter (fN) that determines the effects a unit of radiation. Currently, this fertility parameter has to be entered by the user based on intuition or experience. The goal of this study was to propose a fertility...
Tipo: Journal article Palavras-chave: Nutritional modifier; Pinus radiata; Primary productivity; Radiation-use efficiency; Soil C/N; Soil N.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200011
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A relationship between deep-sea benthic oxygen demand and oceanic primary productivity ArchiMer
Christensen, Jp.
A diagenetic model of porewater O-2 was used to examine the relationship between organic carbon flux to the sediments and benthic oxygen demand (BOD). The model predicted that the organic carbon influx to sediments balances BOD as long as sediments are oxygenated. The critical rate occurs when O-2 at infinite depth disappears. With influxes exceeding the critical rate, the O-2 flux into the sediments via molecular diffusion can not consume all incoming organic matter, and anaerobic conditions result in BOD underestimating the carbon influx. Given that low rates of deep-sea BOD approximate the carbon influx below 9 g.C.m(-2).y(-1), a significant multilinear regression was found between published BOD, primary productivity (P-p, both in g.C.m(-2).y(-1))(,)...
Tipo: Text Palavras-chave: Fonds marins; Oxygène; Production primaire; Respiration; Sédiments; Deep-sea; Oxygen; Primary productivity; Respiration; Sediments.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00325/43578/44046.pdf
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Drought resistance across California ecosystems: evaluating changes in carbon dynamics using satellite imagery. Repositório Alice
MALONE, S. L.; TULBURE, M. G.; PÉREZ-LUQUE, A. J.; ASSAL, T. J.; BREMER, L. L.; DRUCKER, D. P.; HILLIS, V.; VARELA, S.; GOULDEN, M. L..
Drought is a global issue that is exacerbated by climate change and increasing anthropogenic water demands. The recent occurrence of drought in California provides an important opportunity to examine drought response across ecosystem classes (forests, shrublands, grasslands, and wetlands), which is essential to understand how climate influences ecosystem structure and function.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Uso da água; Carbon-uptake efficiency; Drought effects; Ecosystem resistance; Ecosystem type conversions; Primary productivity; Water-use efficiency; Seca; Carbono; Sensoriamento remoto; Ecossistema; Remote sensing.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1056869
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Effects of UV on photosynthesis of Antarctic phytoplankton: models and their application to coastal and pelagic assemblages RChHN
NEALE,PATRICK J.; FRITZ,JENNIFER J.; DAVIS,RICHARD F..
We have characterized the photosynthetic response to ultraviolet radiation (UV) of natural phytoplankton assemblages in Antarctic (Southern Ocean) waters. Biological weighting functions (BWFs) and exposure response curves for inhibition of photosynthesis by UV were measured during spring-time ozone depletion (October-November). Two different models were developed to relate photosynthesis to UV exposure. A model that is a function of the duration of exposure (BWF H) applied to assemblages in the well-mixed open waters of the Weddell-Scotia Confluence (WSC, 60° S, 50° W), since responses were a function of cumulative exposure and recovery rates were slow. These assemblages had a variable but generally high sensitivity to UV. A steady-state model (BWF E)...
Tipo: Journal article Palavras-chave: Southern Ocean; Primary productivity; Ozone depletion; Photosynthesis-irradiance curves; Biological weighting functions.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200006
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Enzyme activities of phytoplankton in the South Shetland Islands (Antarctica) in relation to nutrients and primary production RChHN
IRIARTE,JOSÉ L; GONZÁLEZ,RODRIGO R; QUIÑONES,RENATO A; KANG,SUNG-HO; SHIM,JAE H; VALENZUELA,CYNTHIA P.
Given the potential significance of enzyme activities as a link between internal metabolic pathways and environmental nutrients, we investigated the relationships of nitrate reductase (NR) and alkaline phosphatase (AP) with primary production and inorganic nutrients in South Shetland Islands, Antarctica. Enzymatic activities of the phytoplankton (0.7-210 µm), primary productivity, autotrophic biomass and inorganic nutrients were studied in the upper 100 m depth at nine stations during a cruise in the northwestern area of South Shetland Islands (Antarctica), during late austral spring (December 2000). NR activities fluctuated between 0 and 42.8 nmol L-1 h-1 (mean = 10.08 nmol L-1 h-1, SD = 10.42 nmol L-1 h-1), AP activities between 0.81 and 5.67 nmol L-1...
Tipo: Journal article Palavras-chave: Nitrate reductase; Alkaline phosphatase; Primary productivity; Chlorophyll; Antarctica.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000400009
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Experiência de implantação de monitoramento e avaliação da sustentabilidade de subsistemas de criação animal. Repositório Alice
SANTOS, R. D.; OLÍMPIO, Z. S.; SILVA, D. D. R. da; FERNANDES, F. E. P.; FERNANDES, C. de S.; FARIAS, J. L. de S..
Resumo: O objetivo foi implantar com os agricultores familiares um processo de monitoramento e ava-liação da sustentabilidade de seus subsistemas de criação animal em redesenho. Isso ocor-reu num projeto de desenvolvimento rural chamado Sustentare. A estratégia metodológica foi de estudo de indicadores de sustentabilidade com cinco propriedades do agroecossistema através de reuniões mensais com agricultores e equipe do projeto. A experiência favoreceu intervenções para redesenhar os agroecossistemas familiares. Percebemos diferenças de va-lores de escores para as propriedades do agroecossistema entre os subsistemas avaliados. Compreender autonomia, equidade e sustentabilidade ambiental auxilia agricultores e técni-cos na tomada de decisões de redesenho de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Construção coletiva do Conhecimento; Agroecologia; Autonomia; Equidade; Estabilidade; Sustentare; Sustentabilidade ambiental; Brasil; Região Nordeste; Autonomy; Equity; Stability; Desenvolvimento Sustentável; Desenvolvimento Comunitário; Desenvolvimento Rural; Agricultura Familiar; Comunidade Rural; Produtividade; Agricultura Sustentável; Rural communities; Rural development; Rural and Agricultural Sociology; Environmental sustainability; Primary productivity; Family farms; Small farms; Compost stability; Semiarid zones; Brazil.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095182
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Intraseasonal variability of nearshore productivity in the Northern Humboldt Current System: the role of coastal trapped waves ArchiMer
Echevin, Vincent; Albert, Aurelie; Levy, Marina; Graco, Michelle; Aumont, Olivier; Pietri, Alice; Garric, Gilles.
The impact of intraseasonal coastal-trapped waves on the nearshore Peru ecosystem is investigated using observations and a regional eddy-resolving physical-ecosystem coupled model. Model results show that intraseasonal variability over the period 2000–2006 represents about one fourth of the total surface chlorophyll variance and one third of the carbon export variance on the Peruvian shelf. Evidence is presented that subsurface nutrient and chlorophyll intraseasonal variability are mainly forced by the coastally trapped waves triggered by intraseasonal equatorial Kelvin waves reaching the south american coast, and propagate poleward along the Peru shore at a speed close to that of high order coastal trapped waves modes. The currents associated with the...
Tipo: Text Palavras-chave: Coastally trapped waves; Upwelling dynamics; Humboldt system; Intraseasonal variability; Primary productivity.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00166/27692/25885.pdf
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Making ecological indicators management ready: Assessing the specificity, sensitivity, and threshold response of ecological indicators ArchiMer
Fu, Caihong; Xu, Yi; Bundy, Alida; Grüss, Arnaud; Coll, Marta; Heymans, Johanna J.; Fulton, Elizabeth A.; Shannon, Lynne; Halouani, Ghassen; Velez, Laure; Akoğlu, Ekin; Lynam, Christopher P.; Shin, Yunne-jai.
Moving toward ecosystem-based fisheries management (EBFM) necessitates a suite of ecological indicators that are responsive to fishing pressure, capable of tracking changes in the state of marine ecosystems, and related to management objectives. In this study, we employed the gradient forest method to assess the performance of 14 key ecological indicators in terms of specificity, sensitivity and the detection of thresholds for EBFM across ten marine ecosystems using four modelling frameworks (Ecopath with Ecosim, OSMOSE, Atlantis, and a multi-species size-spectrum model). Across seven of the ten ecosystems, high specificity to fishing pressure was found for most of the 14 indicators. The indicators biomass to fisheries catch ratio (B/C), mean lifespan and...
Tipo: Text Palavras-chave: Ecological modelling; Fishing pressure; Gradient forest method; Indictor performance; Marine ecosystem; Primary productivity.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00500/61148/64576.pdf
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Patterns of litter production in a secondary alluvial Atlantic Rain Forest in southern Brazil Rev. Bras. Bot.
Scheer,Maurício Bergamini; Gatti,Gustavo; Wisniewski,Celina; Mocochinski,Alan Yukio; Cavassani,André Targa; Lorenzetto,Alexandre; Putini,Francisco.
Above-ground litter production is one of the most accessible ways to estimate ecosystem productivity, nutrient fluxes and carbon transfers. Phenological patterns and climatic conditions are still not fully explained well for tropical and subtropical forests under less pronounced dry season and non-seasonal climates, as well as the interaction of these patterns with successional dynamics. Monthly litterfall was estimated for two years in a 9 to 10 year old secondary alluvial Atlantic Rain forest. Total litterfall was higher in the site with more developed vegetation (6.4 ± 1.2 ton ha-1 year-1; 95% confidence interval) as compared to the site with less developed vegetation (3.0 ± 1.0 ton ha-1 year-1). The monthly production of 11 litter fractions (eight...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Litterfall; Meteorological variables; Phenology; Primary productivity; Sucession.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000400018
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Phytoplancton en baie de Seine. Influence du panache fluvial sur la production primaire ArchiMer
Videau, Christiane; Ryckaert, Mireille; L' Helguen, Stéphane.
Phytoplankton distribution and primary productivity were investigated in the Bay of Seine (eastern English Channel, France) in spring and early summer of 1992 and 1994. In 1992, the horizontal distribution of phytoplankton species was determined over the whole Bay of Seine. In 1994, species distribution and primary productivity were studied along the salinity gradient of the Seine plume and in the neighbouring marine waters. Phytoplankton distribution was characterised by the permanent diatom dominance from early spring to early summer. The spring bloom did not occur uniformly over the bay, but was initiated in the marine waters, in the middle of the bay and progressed towards the coast where it developed, in June, in the diluted waters of the Seine plume....
Tipo: Text Palavras-chave: Bay of Seine; Primary productivity; Phytoplankton; Baie de Seine; Production primaire; Phytoplancton.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-843.pdf
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Phytoplancton en baie de Seine. Influence du panache fluvial sur la production primaire ArchiMer
Videau, Christiane; Ryckaert, Mireille; L' Helguen, Stéphane.
Phytoplankton distribution and primary productivity were investigated in the Bay of Seine (eastern English Channel, France) in spring and early summer of 1992 and 1994. In 1992, the horizontal distribution of phytoplankton species was determined over the whole Bay of Seine. In 1994, species distribution and primary productivity were studied along the salinity gradient of the Seine plume and in the neighbouring marine waters. Phytoplankton distribution was characterised by the permanent diatom dominance from early spring to early summer. The spring bloom did not occur uniformly over the bay, but was initiated in the marine waters, in the middle of the bay and progressed towards the coast where it developed, in June, in the diluted waters of the Seine plume....
Tipo: Text Palavras-chave: Baie de Seine; Production primaire; Phytoplancton; Bay of Seine; Primary productivity; Phytoplankton.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00333/44398/44057.pdf
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Produção de liteira em áreas de floresta e capoeira nova em Tomé-Acú, Pará. Repositório Alice
MARQUES, A. F. S.; BASTOS, T. X..
bitstream/item/205276/1/Producao-de-liteira.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Liteira florestal; Produtividade primária; Tomé-Açu; Pará; Brasil; Capoeira; Amazonia; Forest litter; Primary productivity; Vegetation.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/399184
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Produção de "litter" e seu conteúdo de nutrientes em floresta primária e capoeira da Amazônia Oriental. Infoteca-e
DANTAS, M..
1986
Tipo: Outras publicações técnicas (INFOTECA-E) Palavras-chave: Produção de liteira; Produtividade primária; Ecossistema; Matéria orgânica; Relação solo-planta; Nutriente; Capitão Poço; Pará; Amazônia; Brasil; Forest litter; Primary productivity; Ecosystems; Organic matter; Plant soil relations; Nutrients.
Ano: 1986 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/394726
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Produtividade primária de plantas de pimenta longa (Piper hispidinervium C.DC) avaliada nas condições ambientais de Belém - PA. Repositório Alice
SANTOS, E. B. dos; SOUZA, C. M. A.; SILVA, E. S. A.; ROCHA NETO, O. G. da.
bitstream/item/205354/1/Produtividade-primaria-de-plantas.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Produtividade primária; Piper hispidinervium; Adaptation; Aclimatação; Bioquímica Vegetal; Fotossíntese; Pimenta Longa; Biochemistry; Primary productivity.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/399092
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