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  • 1
    In: Oecologia Australis, Oecologia Australis, Vol. 23, No. 04 ( 2019-12-16), p. 917-925
    Type of Medium: Online Resource
    ISSN: 2177-6199
    URL: Issue
    Language: Unknown
    Publisher: Oecologia Australis
    Publication Date: 2019
    detail.hit.zdb_id: 2694774-2
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  • 2
    In: Revista Brasileira de Geografia Física, Revista Brasileira de Geografia Fisica, Vol. 12, No. 1 ( 2019-05-26), p. 343-354
    Abstract: As mudanças no uso da terra ao longo da história têm gerado negativas consequências para Mata Atlântica, deixando-a apenas com cerca de 10% de florestas maduras, com uma redução expressiva dos reservatórios de água e degradação de bacias hidrográficas. Nesta pesquisa se diagnosticou o padrão atual e potencial de ocupação e uso da terra numa microbacia hidrográfica no Município São Miguel do Anta, Minas Gerais, Brasil. Esta pesquisa também teve como prioridade desenvolver um plano de manejo e conservação do recurso hídrico da comunidade. A bacia hidrográfica é ocupada atualmente por pequenos e médios agricultores correspondendo um total de nove propriedades, que mantem diferentes atividades de produção agrícola e pecuária, principalmente do cultivo de café, milho, feijão, eucalipto e granjas de frango de corte como parte do sustento econômico familiar. Os resultados desta pesquisa revelam o padrão de uso e ocupação de uma microbacia no Sudeste do Brasil, onde a maior proporção de área é destinada para atividades de produção agrícola e pecuária. A partir deste padrão de ocupação e das estimações de consumo de água nas diferentes propriedades, propõe-se um plano de manejo preliminar com algumas premissas para a conservação e recuperação desta microbacia. Destaca-se a importância dos sistemas agroflorestais e corredores biológicos como ações imediatas de reabilitação de áreas degradadas e restauração ecológica, com a finalidade de reduzir as perdas de água por escoamento superficial, assim como a perda e degradação de solos.  A B S T R A C TChanges in land use throughout history have generated negative consequences in the Atlantic Forest, leaving it with only about 10% of mature forests, such as a reduction of water reservoirs and degradation of hydrographic basins. In this research the current pattern and potential of land use and use in a hydrographic basin in the Municipality of São Miguel do Anta, Minas Gerais, Brazil, was diagnosed. This research also had as a priority to develop a management and conservation plan of the water resource of the community. The hydrographic basin is currently occupied by small and medium-sized farmers, corresponding to a total of nine properties, which maintains different agricultural and livestock production activities, mainly of coffee, corn, beans, eucalyptus and chicken farms as part of the economic sustenance family. The results of this research reveal the pattern of use and occupation of a microbasin in the Southeast of Brazil, where the largest proportion of area is destined for agricultural and livestock production activities. From this occupation pattern and water consumption estimates in the different properties, a preliminary management plan with some premises for the conservation and recovery of this microbasin is proposed. It is important to emphasize the importance of agroforestry systems and biological corridors as immediate actions for the rehabilitation of degraded areas and ecological restoration respectively in order to reduce water losses due to runoff, as well as soil loss and degradation.Keywords: Agroforestry; biological corridor; Permanent preservation areas; rehabilitation of degraded areas.
    Type of Medium: Online Resource
    ISSN: 1984-2295
    Language: Unknown
    Publisher: Revista Brasileira de Geografia Fisica
    Publication Date: 2019
    detail.hit.zdb_id: 2675549-X
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  • 3
    In: Cumbres, Universidad Tecnica de Machala, Vol. 4, No. 2 ( 2019-02-28), p. 77-90
    Abstract: El uso de la harina de pescado como suplemento nutricional en las dietas suministradas a codornices fue estudiado para identificar el efecto sobre la producción y calidad del huevo. Se analizaron 180 codornices bajo un diseño experimental completamente al azar, de tres bloques con seis tratamientos, tres repeticiones y 10 codornices por repetición. Se utilizaron dietas experimentales considerando diferentes niveles de adición de harina de pescado (0%, 6%, 7%, 8%, 9% y 10%) a un alimento comercial. Fueron analizadas diferentes variables de producción y calidad del huevo de codorniz: número de huevos, peso, volumen, manchado, brillantez y huevos rotos. Así como, la composición proximal y la calidad sensorial.  Los resultados se analizaron usando ANOVA y test de Tukey al 5%. Se encontraron diferencias significativas entre los tratamientos cuando se consideró la variable número de huevos, mientras que, entre los bloques no hubo diferencia significativa. Las variables peso y volumen no mostraron diferencias significativas. Sin embargo, el manchado y brillantez mostraron diferencias entre los tratamientos, cuyo valor óptimo fue alcanzado por el tratamiento con 9% de harina de pescado. Con esta información, se evidenció que existe una influencia positiva de la adición de 9% de harina de pescado sobre la calidad del manchado, brillantez del huevo de codorniz y sobre la composición nutricional. Del mismo modo, los atributos sensoriales (olor y sabor) de los huevos fueron aceptables. En general, esto indica que bajo este tratamiento es posible la reproducción artificial de los huevos de codorniz.
    Type of Medium: Online Resource
    ISSN: 1390-3365 , 1390-9541
    Language: Unknown
    Publisher: Universidad Tecnica de Machala
    Publication Date: 2019
    detail.hit.zdb_id: 2863703-3
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  • 4
    Online Resource
    Online Resource
    Universidad Autonoma de Yucatan. Facultad de Medicina Veterinaria y Zootecnia ; 2017
    In:  Tropical and Subtropical Agroecosystems Vol. 20, No. 2 ( 2017-08-29)
    In: Tropical and Subtropical Agroecosystems, Universidad Autonoma de Yucatan. Facultad de Medicina Veterinaria y Zootecnia, Vol. 20, No. 2 ( 2017-08-29)
    Abstract: 〈 p 〉 Weeds represent one problem for potato cultivation in the Venezuelan Andes; however ecological studies to improve their management are limited. This study has aimed to carry out a phytosociological survey of weed community after potato cultivation in Mérida, Mérida state, Venezuela. The experiment was carried out under a completely randomized design with 20 plots (2x2 m). The weeds surveys were conducted at two month intervals, randomly selecting five plots per session during June 2006 and February 2007, to 60 days after cultivation (DDC), 120, 180, and 240 DDC. The phytosociological survey was performed involving identification and quantification of numbers of individuals the weeds in each plot. After were estimated of phytosociological parameters such as density, frequency, abundance to calculate the importance value index. A multivariate non-metric multidimensional scaling (NMDS) was performed using species abundances; also was used the unweighted pair group method with arithmetic mean (UPGMA) with presence absence data. Seventeen families, 32 genera and 35 species of weeds were identified, with the Asteraceae, Fabaceae and Poaceae families showed higher importance within the community. The most important species in the all stages were 〈 em 〉 Pennisetum clandestinum 〈 /em 〉 , 〈 em 〉 Paspalum decumbens 〈 /em 〉 , 〈 em 〉 Desmodium adscendens 〈 /em 〉 , 〈 em 〉 Aldama dentata 〈 /em 〉 , 〈 em 〉 Borreria laevis 〈 /em 〉 , and 〈 em 〉 Jaegeria hirta 〈 /em 〉 . Significant differences in phytosociological parameters were observed among weed species at each stage and among the different stages after potato cultivation. 〈 /p 〉
    Type of Medium: Online Resource
    ISSN: 1870-0462
    Language: Unknown
    Publisher: Universidad Autonoma de Yucatan. Facultad de Medicina Veterinaria y Zootecnia
    Publication Date: 2017
    detail.hit.zdb_id: 2486562-X
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  • 5
    Online Resource
    Online Resource
    Revista Engenharia na Agricultura ; 2021
    In:  Revista Engenharia na Agricultura - Reveng Vol. 29 ( 2021-06-18), p. 81-89
    In: Revista Engenharia na Agricultura - Reveng, Revista Engenharia na Agricultura, Vol. 29 ( 2021-06-18), p. 81-89
    Abstract: The crop coefficient (Kc) is one of the most important parameters for studying the water balance, which aims to assess the relationship between growth and production dynamics and the management of water resources in irrigation systems. Thus, in this study, the effect of Kc variation on the water balance was evaluated throughout the bean crop cycle in Northeast Brazil, using a dynamic systems model. The effect of Kc variation scenarios on the water balance in the bean crop in Northeastern Brazil was simulated using the Vensim program. The soil water storage was used as state variable, input flow variable and outflow of water in the soil, and auxiliary variables that influence system flows were also considered. Thus, four simulation scenarios were performed changing values of the bean crop coefficient (Kc = 0.62; Kc = 0.72; Kc = 0.82; Kc = 0.92). The variation in soil water storage showed negative values in most phenological phases, showing significant differences between Kc conditions, depending mainly on the precipitation dynamics.  
    Type of Medium: Online Resource
    ISSN: 2175-6813 , 1414-3984
    Language: Unknown
    Publisher: Revista Engenharia na Agricultura
    Publication Date: 2021
    detail.hit.zdb_id: 2558705-5
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  • 6
    In: Revista de Biología Tropical, Universidad de Costa Rica, Vol. 66, No. 2 ( 2018-05-24), p. 937-
    Abstract: Species-area relation and species abundance distribution in a plant community on a tropical inselberg: effect of patch size. Although inselbergs are iconic rock outcrops with a high biogeographic value, little is known about drivers responsible for the plant community assembly. The aim of this research was to evaluate how the patch size distribution of vegetation influences the species-area relationship and species abundance distribution of a community in an inselberg of the “Piedra La Tortuga” Natural Monument of the Guayana region, Venezuela. In this context, three research questions were established: What is the effect of patch size on species richness? What species-area model (SAR) has the best fit in those vegetation patches? How is the distribution of species abundances (SADs) induced by the patch size distribution? A stratified random sampling was performed in patches ranging from 0.34 to 14.8 m2, totaling 40 sampling units (226 m2). All individuals found in the 40 patches were identified at species level. The floristic composition in the different samples was represented by 19 families, 22 genera and 24 species, of which 50 % are endemic to inselbergs and two, are threatened of extinction. Two groups of patch sizes were identified (large 8-15 m2 and small ≤ 7.9 m2) in relation to the abundance and composition of species. The species accumulation curves for each patch size group show a contrasting tendency with marked differences in the observed richness among patch size groups. The curves of the SADs models had a significant adjustment of the geometric series in the two categories of patches. The SAR model of the power function presented the best species-area adjustments, where the increase in patch area accounted for 82 % of the variation in the increase in the number of species. The results of this study demonstrate for the first time how vegetation patches of a tropical inselberg have a strong influence on richness, abundance distribution and species composition. Likewise, it was determined that the SAD geometric model presented the best fit in the community as a function of patch size as a resource indicator, where the abundance of a species can be equivalent to a proportion of the space occupied. It is also presumed that changes in patch sizes could be associated with nutrient and water availability, as has been demonstrated in other dryland environments. In some studies it has been argued that variation in species composition among vegetation profiles of tropical inselbergs is mainly conditioned by habitat structure and water deficit. However, it had not been discussed how the size of patches of vegetation has an effect on richness. SADs and SAR analyzes can provide complementary explanations on community assembly in inselbergs. Rev. Biol. Trop. 66(2): 937-951. Epub 2018 June 01. 
    Type of Medium: Online Resource
    ISSN: 2215-2075 , 0034-7744
    URL: Issue
    Language: Unknown
    Publisher: Universidad de Costa Rica
    Publication Date: 2018
    detail.hit.zdb_id: 2020929-0
    SSG: 7,36
    SSG: 12
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  • 7
    In: Revista de Biología Tropical, Universidad de Costa Rica, Vol. 68, No. 1 ( 2020-02-03)
    Abstract: Introduction: Local environmental filters have shown the influence on the bryophyte diversity and structure communities, but there are limited studies that analyze how biotic relationships filters influence these communities. Objective: To evaluate whether the influence of fern Asplenium auritum cover determine changes in species richness and composition of bryophyte communities, in a semideciduous remnant forest, Minas Gerais, Brazil. Methods: We selected one transect of 300 m in each of six areas where Asplenium auritum was present. In all transect we estimated plant cover in 39 10 × 10 cm plots randomly distributed. We compare the estimated species richness and composition of bryophyte between fern coverage levels. Results: We found 60 species in 35 genera and 23 families. Weft and mat were the most represented life-forms. Fern cover had no significant effect on bryophyte species richness and composition. Conclusions: Bryophyte cover appears to improve fern development and promote the coexistence of several bryophyte species. Bryophyte cover probably predicts variations in species richness and drives the species assemblage in this community.
    Type of Medium: Online Resource
    ISSN: 2215-2075 , 0034-7744
    URL: Issue
    Language: Unknown
    Publisher: Universidad de Costa Rica
    Publication Date: 2020
    detail.hit.zdb_id: 2020929-0
    SSG: 7,36
    SSG: 12
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  • 8
    Online Resource
    Online Resource
    Universidad Nacional de Colombia ; 2017
    In:  Agronomía Colombiana Vol. 35, No. 2 ( 2017-05-01), p. 171-175
    In: Agronomía Colombiana, Universidad Nacional de Colombia, Vol. 35, No. 2 ( 2017-05-01), p. 171-175
    Abstract: Nitrogen fertilization has considerable effects on growth and yield of potato crop. Leaf expansion is one of the most important growth parameters that can be used to optimize nitrogen fertilization management in agroecological practices. We evaluated the effect of nitrogen fertilization on the leaf area index (LAI) of potato crop during different phenological stages by two different methods. Experimental plots were established in a randomized block design with the following treatments: no nitrogen supply (0-N), 133 kg N ha-1 (133-N), and 400 kg N ha-1 (400-N), using the Granola variety, at the Andes region, Merida city, Venezuela. We measured leaf area at the main phenological stages of the crop using a plant canopy analyzer. LAI showed significant differences among treatments and phenological stages, except during the emergence stage. The maximum LAI values were obtained 55 days after emergence: 400-N (1.42±0.16) 〉 133-N (0.92±0.21) 〉 0-N (0.34±0.08). Nitrogen fertilization had a significant effect on the development of LAI in potato crop along its different phenological stages.
    Type of Medium: Online Resource
    ISSN: 2357-3732 , 0120-9965
    Language: Unknown
    Publisher: Universidad Nacional de Colombia
    Publication Date: 2017
    detail.hit.zdb_id: 2260941-6
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  • 9
    In: Revista de Biología Tropical, Universidad de Costa Rica, Vol. 68, No. 3 ( 2020-07-03)
    Abstract: Introduction: Studies on how the altitudinal gradient determines community composition and structure in tropical high altitude grasslands are limited. Objective: To evaluate the plant community composition and structure and their relationship with altitude and soil properties along an altitudinal gradient of three granitic rocky outcrops at the Serra do Brigadeiro State Park, Minas Gerais, in southeastern Brazil. Methods: In each selected site, 100 plots of 1 × 1 m were established, totalizing 300 plots in the study area. We compared floristic composition, relative coverage and abundance among sites. We performed beta diversity analysis. We also performed an indicator species analysis and a canonical correlation analysis to investigate possible relations between abiotic (soil and altitude) and biotic (indicator species abundances) variables. Results: We sampled a total of 9 276 individuals belonging to 39 families and 102 species. Significant differences were observed among sites regarding composition, abundance and coverage. The indicator species analysis revealed that 57 species (55.88 %) were indicators. The distribution of indicator species abundances was correlated with environmental variables. Conclusions: It was observed that altitude and soil play an important role in controlling community composition and structure, beta diversity and species distribution in the highland grasslands studied.
    Type of Medium: Online Resource
    ISSN: 2215-2075 , 0034-7744
    URL: Issue
    Language: Unknown
    Publisher: Universidad de Costa Rica
    Publication Date: 2020
    detail.hit.zdb_id: 2020929-0
    SSG: 7,36
    SSG: 12
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  • 10
    In: Revista Brasileira de Climatologia, ABClima (Brazilian Association of Climatology), Vol. 26 ( 2021-03-04)
    Abstract: O objetivo neste trabalho foi avaliar o balanço hídrico em uma microbacia hidrográfica no Município São Miguel do Anta, Minas Gerais, Brasil. Procurou-se apontar os benefícios do balanço hídrico no manejo do solo visando identificar as melhores épocas com estoques de água no solo capazes de manter o potencial produtivo em cultivos agrícolas como garantia de prestação de serviços ecossistêmicos. As estimativas do balanço hídrico na microbacia foi realizado usando métodos que incluam no modelo variável explicativas de fluxos associados à precipitação pluvial, evaporação, evapotranspiração, vazão, armazenamento de água em reservatórios, e estimação de água usada na irrigação. Observa-se que a maior evapotranspiração da microbacia ocorreu no mês de janeiro com um valor médio de 93,9 mm e as menores taxas evapotranspiratórias ocorreram em junho com 56,5 mm. Esses resultados evidenciam que em janeiro há maior oferta de água no solo, pois os déficits hídricos são reduzidos, atingindo no máximo 94,4 mm. Em março os excessos hídricos atingem valores médios de 149,4 mm, indicando que há alta oferta de água na microbacia para atender a demanda evapotranspiratória das plantas. Os meses de fevereiro, março, novembro e dezembro contabilizaram as maiores cotas pluviais, chegando ao máximo de 230 mm no mês de março. Por outro lado, os meses menos pluviosos foram maio, junho, julho e janeiro, atingindo valores mínimos de 3 mm no mês de junho. O principal fluxo de saída de água da bacia hidrográfica foi devido à evapotranspiração, correspondendo a 80%, reforçando a importância desse serviço ecossistêmico em bombear para atmosfera vapor de água para manter o ciclo hidrológico na microbacia hidrográfica. A variação sazonal da vazão média da microbacia é explicada pela estacionalidade das chuvas que determinam o balanço hídrico e que são influenciadas pelos tipos de cobertura do solo nas diferentes formas de uso da água para atender as atividades antrópicas em microbacias hidrográficas.
    Type of Medium: Online Resource
    ISSN: 2237-8642 , 2237-8642
    URL: Issue
    Language: Unknown
    Publisher: ABClima (Brazilian Association of Climatology)
    Publication Date: 2021
    detail.hit.zdb_id: 2659451-1
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