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| Registros recuperados: 25 | |
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| Kolb,Rosana Marta; Pilon,Natashi Aparecida Lima; Durigan,Giselda. |
| Few studies address the ecology of herbs of Cerrado grasslands, which are ecosystems where the long dry season, high temperatures, insolation, fire and invasive grasses greatly influencing germination and the establishment of plants. We assessed germination of 13 species of Poaceae from Cerrado grasslands under nursery conditions or in germination chambers, the latter with i) recently collected seeds and seeds after six months storage, ii) under constant and alternating temperatures, and iii) in the presence and absence of light. Germinability, mean germination time (MGT) and required light were quantified to elucidate factors involved in successful germination. Germinability was low for most grasses, probably because of low seed viability. For most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Grasslands; Poaceae; Savanna; Seed storage; Seed viability. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100087 |
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| Martins,Alexandre Cristante; Marchioretto,Rafaella Migliavacca; Vieira,Ariane Tonetto; Stiehl-Alves,Eudes Maria; Santos,Eliane Kaltchuk dos; Souza-Chies,Tatiana Teixeira de. |
| ABSTRACT South Brazilian grasslands are among the most species-rich grasslands worldwide yet they have been suffering ongoing degradation due to land-use. Little is known about the reproductive ecology of the native species of these grasslands. Thus, our goal was to characterize seed traits and germination requirements of three native species of the tribe Tigridieae (Iridaceae, Iridoideae) due to its richness in the Pampa biome and the contrasting morphology, cytogenetics, and geographic distributions of its representatives. We tested if closely related species possess similar seed traits and whether species with wider distributions have broader germination requirements. Seed production and mass were estimated, and morphological analyses, germination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormancy; Functional traits; Germination; Grasslands; Iridaceae; Photoinhibition; Regeneration niche; Reproductive ecology; Seed morphology; Time-to-event analysis. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400730 |
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| Bastiani,Veluma Ialú Molinari De; Boschetti,Joana Priscilla; Santos,Tiago Gomes dos; Lucas,Elaine Maria. |
| Abstract: Pithecopus rusticus is a newly described species, of which information on its natural history, vocalization and tadpole morphology are still lacking. Here, we describe the larval external morphology of P. rusticus from the type locality, in the municipality of Água Doce, state of Santa Catarina, southern Brazil, comparing it with that of other species of the genus Pithecopus and providing information on its natural history. Eggs from two spawns were collected and kept in the laboratory until hatching. The tadpoles of P. rusticus belong to the suspension-rasper guild. At Gosner stage 37, the tadpoles showed: body shape oval in dorsal view and triangular in lateral view; a tooth row formula of 2(2)/3(1); the third lower row six times shorter than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Taxonomy; Grasslands; Atlantic Forest. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000100205 |
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| Paz Deble,Leonardo; da Silva Alves,Fabiano; de Oliveira-Deble,Anabela S. |
| Three new species of Cypella section Nais from South America are described and illustrated: C. charruana, C. gloriana, and C. uliginosa. Cypella charruana occurs in Santana do Livramento (southern Brazil) and in Rivera and Artigas (northern Uruguay). It is related to C. suffusa; however, it can be easily separated by its one-flowered spathes, outer tepals with narrowed claws, longer antheral filaments, and bigger anthers. Cypella gloriana is only found in São Vicente do Sul (central-western Rio Grande do Sul State, Brazil); this species is closely related to C. pusilla from which it can be separated by its larger perigone with shallower and broader concavity, outer tepals with narrowed claws, inner tepals with blades markedly narrowed and longer towards... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulbous; Geophyte; Grasslands; Taxonomy. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932015000200006 |
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| Ojeda Morales, Uri Marcial. |
| La presente investigación tiene como objetivo principal, primero: caracterizar la vegetación naturales y los principales sistemas de producción de la Cuenca Cárdenas-Comalcalco tomando en cuenta su altura, estructura y composición florística. Los resultados muestran que el 27 % de la Cuenca es vegetación natural, siendo el matorral espinoso e inerme inundable el más diverso con 169 especies registradas, seguido de las comunidades de hidrófitas con 165 espescies y el acahual con 119 espescies. En conjunto con el palmar inundable, la selva baja inundable y le manglar ocupan el 60 % de la vegetación natural, lo cual demuestra que la mayor parte de la vegetación es tolerante a la inundación, mientras que los sistemas de producción que representan el 58 %... |
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Palavras-chave: Vegetación natural; Humedales; Pastizales; Ganadería; Natural vegetation; Wetlands; Grasslands; Livestock; Maestría; Producción Agroalimentaria en el Trópico. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/347 |
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| In the Río de la Plata grasslands (RPG) biogeographical region of South America, agricultural activities have undergone important changes during the last 15–18 years because of technological improvements and new national and international market conditions. We characterized changes in the landscape structure between 1985–1989 and 2002–2004 for eight pilot areas distributed across the main regional environmental gradients. These areas incorporated approximately 35% of the 7.5 × 105 km² of the system. Our approach involved the generation of land-use and land cover maps, the analysis of landscape metrics, and the computation of annual transition probabilities between land cover types. All of the... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Campos; Fragmentation; Grasslands; Land use; Landscape dynamics pampas; Remote sensing; Spatial metrics. |
| Ano: 2008 |
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| Gutman, Mario; Agricultural Research Organization; mgutman@shani.net; Noy-Meir, Imanuel; Hebrew University of Jerusalem; noymeir@agri.huji.ac.il; Pluda, Daniel C; Volcani Center;; Seligman, No'am; Volcani Center; noamseli@netvision.net.il; Rothman, Steven; ;; Sternberg, Marcelo; Tel Aviv University; MarceloS@tauex.tau.ac.il. |
| A two-year experiment was conducted in northeastern Israel to study the effects of various defoliation regimes on biomass partitioning between vegetative and reproductive structures in a perennial and an annual Mediterranean grass. Greater insight into the mechanisms regulating biomass partitioning after defoliation enables ecologists and rangeland managers to interpret and predict population and community dynamics in Mediterranean grasslands more efficiently. Two typical Mediterranean grasses, Triticum dicoccoides, an annual species, and Hordeum bulbosum, a perennial species, were grown in containers in the open. They were subjected to a series of defoliation treatments that comprised three clipping frequencies and three clipping heights in a full... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Annual vs. perennial grasses; Biomass partitioning; Defoliation treatments; Grasslands; Grazing response; Hordeum bulbosum; Israel; Mediterranean; Reproductive effort; Triticum dicoccoides; Vegetative vs. reproductive structures.. |
| Ano: 2001 |
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| Vargas,Rafael S.; Bataiolli,Renata; da Costa,Pedro B.; Lisboa,Bruno; Passaglia,Luciane Maria P.; Beneduzi,Anelise; Vargas,Luciano K.. |
| The aim of this study was to evaluate the impact of different grazing pressures on the activity and diversity of soil bacteria. We performed a long-term experiment in Eldorado do Sul, southern Brazil, that assessed three levels of grazing pressure: high pressure (HP), with 4% herbage allowance (HA), moderate pressure (MP), with 12% HA, and low pressure (LP), with 16% HA. Two reference areas were also assessed, one of never-grazed native vegetation (NG) and another of regenerated vegetation after two years of grazing (RG). Soil samples were evaluated for microbial biomass and enzymatic (β-glucosidase, arylsulfatase and urease) activities. The structure of the bacterial community and the population of diazotrophic bacteria were evaluated by RFLP of the 16S... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial diversity; Diazotrophic bacteria; Diversity; Grasslands; Soil microbial communities. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000200205 |
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| John,Ana Laura de Wallau; Mäder,Geraldo; Fregonezi,Jeferson N.; Freitas,Loreta B.. |
| Abstract Calibrachoa is a South-American genus comprising 27 species, several considered endemic or rare; few were subjects in genetic studies. We attempted to generate new data about the phylogenetically related and rare species C. eglandulata, C. sendtneriana, C. serrulata, and C. spathulata concerning their genetic diversity and population structure, which, coupled with their known restricted distribution, could help access their conservation status and contribute to the study of the Brazilian biodiversity. We sequenced 88 individuals for plastid intergenic spacers and genotyped 186 individuals for five microsatellite loci. Compared among each other, C. sendtneriana and C. serrulata presented the highest values of genetic diversity [π% (sd) = 0.23... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plastid DNA; Microsatellites; Threatened species; Grasslands; Herbaceous species. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100108 |
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| Frainer,André; Duarte,Marcelo M.. |
| Soil invertebrate distribution in Araucaria forest, grassland and edge habitats was studied in both disturbed and undisturbed areas in southern Brazil. Mean-density and taxa compositions were verified. Invertebrate densities differed between grassland and the other two habitats in the undisturbed area but not across the disturbed one. At the disturbed area taxa differed between the grassland and the other two habitats. The undisturbed area, on the other hand, presented taxa differences only between the grassland and the forest habitats. Acari, Arachnida and Collembola were the most sensitive taxa for detecting differences across habitats in both areas. At the disturbed area, these taxa presented densities lowering from the forest to the grassland. At the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Araucaria forest; Forest edge; Grasslands; Acari; Collembola. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000300013 |
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| POTT, A.. |
| Quatro milhoes de bovinos sao sustentados pelas pastagens naturais do Pantanal, para as quais sao listadas 145 gramineas, 70 leguminosas e 60 forrageiras nao convencionais (de 31 familias), alem de 21 invasoras, com graus de frequencia, textura de solo, alagamento e qualificacao forrageira. Sao apresentados teores de PB para 15 gramineas, e de PB e minerais para 20 forrageiras de outras familias. As principais forrageiras do Pantanal arenoso sao Axonopus purpusii (mimoso) e Mesosetum chaseae (grama-de-cerrado); do argiloso, sao Hemartyria altissima (mimoso-de-talo) e Leersia hexandra (felpudo), enquanto no siltoso sao Paratheria prostrata (mimoso-peludo), Paspalidum paludivagum, Paspalum plicatulum (felpudo) Reimarochloa spp.(mimosinho), que tambem estao... |
| Tipo: Livros |
Palavras-chave: Forrageira; Mato Grosso do Sul; Pasture; Pastagem; Brazil; Pantanal; Forage; Grasslands. |
| Ano: 1988 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/787692 |
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| KHALIL, M. I.; CORDOVIL, C. M. D. S.; FRANCAVIGLIA, R.; HENRY, B.; KLUMPP, K.; KONCZ, P.; LLORENTE, M.; MADARI, B. E.; MUÑOZ-ROJAS, M.; RAINER, N.. |
| 1. Related practices. 2. Description of the case study. 3. Context of the case study. 4. Possibility of scaling up. 5. Impact on soil organic carbon stocks. 6. Other benefits of the practice. 7. Potential drawbacks to the practice. 8. Recommendations before implementing the practice. 9. Potential barriers for adoption. |
| Tipo: Parte de livro |
Palavras-chave: Land use change; Grasslands; Arable soils; Germany. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136316 |
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| Zhou,C; Busso,C; Liu,J; Yang,YG; Sun,Y; Fang,YZ; Zhang,QQ; Zhou,YB; Wang,YN; Zhang,Z; Wang,ZW; Yang,YF. |
| The objective of this study was to analyze the relationships between total aboveground plant biomass versus altitude, latitude, longitude, mean annual temperature, mean annual precipitation, and species diversity. Simple linear regression analysis was used to study these relationships. Results showed that altitude was significantly, positively (R² = 0.038, P<0.01) related with total plant aboveground biomass. Meanwhile, when longitude (R² = 0.124, P<0.001) and latitude (R² = 0.221, P<0.001) increased, total aboveground biomass decreased. The relationship between biomass and mean annual precipitation was significantly, positively linear (R² = 0.149, P<0.001). Mean annual temperature was signifcantly, negatively correlated with biomass (R² =... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Productivity; Species diversity; Climate; Grasslands. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100017 |
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| Avanzini, Marco; Salvador, Isabella; Gios, Geremia. |
| Upland population levels are strongly correlated to environmental dynamics such as morphology, exposure and climate. A temperature fall leads to a shortening of the plant growth season, which can lead to lower pasture productivity and thus livestock can spend shorter periods in the mountains. The aim of this research is to correlate natural climate constraints with variation in the grasslands value in a selection of pastures located between 1100 and 1800 m in the Pasubio Massif (Italian Southern Alps, Trento). The correlation of this trend (derived from historical documents) with climatic oscillations in the same area derived from speleothems reveals that the variation in upland value was strictly linked to temperature and climate variations |
| Tipo: Presentation |
Palavras-chave: Mountain; Climate; Pastures; Grasslands; Environmental Economics and Policy. |
| Ano: 2012 |
URL: http://purl.umn.edu/124126 |
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| Nagy, Geza. |
| Sustainability and multifunctionality, two key principles, which will determine future development in any activities. On the bases of these principles, society as a whole has already outlined future expectations towards rural areas. Rural functions (economic, ecological and socio-cultural ones) have been declared in European Charter for Rural Areas. To what extend can different rural development initiatives meet these functions? The question may be answered by using the method of multifunctional rural resource analysis (NAGY, 2007). The paper is investigating the potential for Hungarian grasslands by using this methodology. It is concluded that our grasslands, as land use systems in their present conditions can participate in integrated rural development... |
| Tipo: Journal Article |
Palavras-chave: Sustainability; Multifunctionality; Grasslands; Future potential; Agricultural and Food Policy; Community/Rural/Urban Development; Land Economics/Use. |
| Ano: 2009 |
URL: http://purl.umn.edu/53563 |
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| Registros recuperados: 25 | |
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