Consulta: subjectFacets:"Grasslands"
Registros recuperados: 21
Data/hora: 04/06/2024 03:48:43

Three new species of the genus cypella (Iridaceae, tigridieae)
Provedor de dados: 66
Autores: 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

Vegetación y sistemas de producción de la cuenca Cárdenas-Comalcalco, Tabasco.
Provedor de dados: 32
Autores: 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 %...
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

Biomass Partitioning Following Defoliation of Annual and Perennial Mediterranean Grasses
Provedor de dados: 7
Autores: 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

Land-Use and Land Cover Dynamics in South American Temperate Grasslands
Provedor de dados: 7
In the R&amp;#237;o de la Plata grasslands (RPG) biogeographical region of South America, agricultural activities have undergone important changes during the last 15&amp;#8211;18 years because of technological improvements and new national and international market conditions. We characterized changes in the landscape structure between 1985&amp;#8211;1989 and 2002&amp;#8211;2004 for eight pilot areas distributed across the main regional environmental gradients. These areas incorporated approximately 35% of the 7.5 &amp;#215; 105 km&amp;#178 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

Genetic diversity and population structure of naturally rare Calibrachoa species with small distribution in southern Brazil
Provedor de dados: 74
Autores: 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

Microbial quality of soil from the Pampa biome in response to different grazing pressures
Provedor de dados: 74
Autores: 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

Soil invertebrates in southern Brazilian Araucaria forest - grassland mosaic: differences between disturbed and undisturbed areas
Provedor de dados: 76
Autores: 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

Opções e estabelecimento de plantas forrageiras cultivadas para o Semiárido Brasileiro.
Provedor de dados: 14
Autores: POMPEU, R. C. F. F.; SOUZA, H. A. de; GUEDES, F. L.
A ocorrência periódica de secas e a irregularidade na distribuição das chuvas na região Nordeste, especialmente nos 900.000 km2 de semiárido são os principais fatores climáticos limitantes da produção pecuária nessa região do Brasil. Faz-se necessário o estabelecimento de um conjunto de estratégias que possam minimizar os impactos negativos da seca não apenas em momentos emergenciais, mas com um planejamento estratégico que crie as condições para as transformações sociais, políticas, econômicas ou científicas fundamentais para alavancar essas atividades pecuárias em benefício do desenvolvimento do país. Assim, o uso de tecnologias básicas, como o cultivo de espécies forrageiras adaptadas às condições climáticas do semiárido é uma das práticas que poderão...
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Semiárido; Brasil; Nordeste; Feed crops.; Cultivo; Alimento para animal; Planta forrageira; Pastagem; Manejo; Capineira; Pastejo; Seca; Nutrição animal; Volumosos.; Pastures; Grasslands; Dry season; Semiarid zones; Animal nutrition; Semiarid soils; Animal feeding.; Brazil; Forage production.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1019371

Avoidance of land use change (LUC)from grassland to arable land, Germany.
Provedor de dados: 14
Autores: 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: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Land use change; Grasslands; Arable soils; Germany.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136316

Total aboveground plant biomass is more strongly affected by climate than species diversity on a grassland in Liaoning, China
Provedor de dados: 85
Autores: 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&lt;0.01) related with total plant aboveground biomass. Meanwhile, when longitude (R² = 0.124, P&lt;0.001) and latitude (R² = 0.221, P&lt;0.001) increased, total aboveground biomass decreased. The relationship between biomass and mean annual precipitation was significantly, positively linear (R² = 0.149, P&lt;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

Uomo e montagna tra economia tradizionale e cambiamenti climatici: il caso del Pasubio tra XVIII e XX secolo
Provedor de dados: 31
Autores: 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

POTENTIAL FOR HUNGARIAN GRASSLANDS IN INTEGRATED RURAL DEVELOPMENT
Provedor de dados: 31
Autores: 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

Current and future land use and land cover scenarios in the Arroio Marrecas watershed
Provedor de dados: 91
Autores: Tornquist,Carlos G.; Silva,Diego S. da.
ABSTRACT This study evaluated historic land use and land cover changes in the Arroio Marrecas watershed (Caxias do Sul, Rio Grande do Sul state of Brazil) and simulated future land use scenarios until 2034. Spatial and temporal simulations were conducted with the Conversion of Land Use and its Effects - Small Regional Extent (CLUE-S) model. Three land use scenarios were developed to include public policies and agricultural trends in the study region for 20 years (2015-2034). Geospatial analysis of different land uses showed that areas that were originally covered grasslands and forests decreased, which can be attributed to the expansion of intensive agricultural uses, such as fruit farming/forestry and urbanization. The reallocation dynamics of land use...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geospatial analysis; Environmental modeling; CLUE-S; Grasslands.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300215

Houseflies speaking for the conservation of natural areas: a broad sampling of Muscidae (Diptera) on coastal plains of the Pampa biome, Southern Brazil
Provedor de dados: 92
Autores: Zafalon-Silva,Ândrio; Kirst,Frederico Dutra; Krüger,Rodrigo Ferreira.
ABSTRACT The Brazilian Coastal Plain of the Pampa Biome (CPPB), has suffered fragmentation caused by resource extraction and cattle raising. In turn, conservation proposals are needed to prevent the anthropisation of Pampa natural areas. The first step towards conservation proposals by using insects is fauna inventories, providing data support for legislators. Thus, we undertook a regional and broad-scale sampling survey to investigate the diversity of Muscidae flies in protected and non-protected areas of CPPB. In addition, we carried out an ecological guild diversity analysis as a metric approach of bioindication. The Muscidae sampling resulted in 6314 specimens, 98 species taxa in 31 genera. Based on diversity estimators, our sampling represents 70-86%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Diptera; Ecology; Guilds; Grasslands; Muscidae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000400292

Population analysis of white grubs (Coleoptera: Melolonthidae) throughout the Brazilian Pampa biome
Provedor de dados: 92
Autores: Valmorbida,Ivair; Cherman,Mariana Alejandra; Perini,Clérison Régis; Cavallin,Lucas de Arruda; Guedes,Jerson Vanderlei Carús.
ABSTRACT The replacement of natural grassland by cultivated areas might favor the increase in abundance of some root-feeding species such as the white grubs, which may become a constraint for field crop production. This research aimed to assay the population density and geographical distribution of white grubs pest and other species in natural grassland and cultivated areas throughout the Brazilian Pampa biome. White grubs were sampled in 18 locations in both landscape use types and identified. Population density (number of larvae m-2) was calculated for each recorded species and sorted within two groups (pest species and other species), compared between natural grasslands and cultivated areas, as well as among locations. A dendrogram to evaluate species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population density; Diloboderus abderus; Plectris; Grasslands; Cultivated areas.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000400275

Lolium multiflorum seeds in the soil: I. Soil seed bank dynamics in a no til system
Provedor de dados: 95
Autores: Maia,Fernanda Costa; Maia,Manoel de Souza; Bekker,Renée M.; Berton,Rogério Previatti; Caetano,Leandro Sebastião.
The objective of the study was to characterize annual ryegrass seed population dynamics, managed for natural re-sowing, in no til systems in rotation with soybean, in different chronosequences An area was cultivated for two years with soybean, left as fallow land for the next two years and then cultivated again with soybean for the next two years. The four chronosequences represented different management periods, two with soybean (6 and 8 years old) and the other two resting (3 and 9 years old). Soil samples were taken every month during one year and divided into two depths (0-5 and 5-10 cm). Vegetation dynamics were also evaluated (number of plants, inflorescences and seedlings). Soil seed bank (SSB) dynamics showed structural patterns in time, with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annual ryegrass; Buried seeds; Soybean; Grasslands; No til system.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222008000200013

Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
Provedor de dados: 97
Autores: González-Rojas,José I.; Padilla-Rangel,Hernaldo; Ruvalcaba-Ortega,Irene; Cruz-Nieto,Miguel A.; Canales-del-Castillo,Ricardo; Guzmán-Velasco,Antonio.
Abstract  Background  The long-eared owl (Asio otus) has a Holarctic distribution, including much of North America. This nocturnal species is considered to be extremely secretive, and poorly known in the Great Plains of the United States and Canada, as well as to México, where no previous studies on its diet have been conducted.  Findings  We analyzed 120 pellets collected during January 2007 in roosts in a 2-3 m height mesquite scrub within a grassland area of Reserva Ecológica El Uno, located in the Natural Protected Area Janos. We registered and identified three orders, four families, eight genera and ten species of mammals and two orders and one family of insects. Winter diet is dominated by mammals, especially rodents in both frequency and biomass....
Tipo: Journal article
Palavras-chave: Winter diet; Long-eared owl; Grasslands; Janos; México.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2017000100401

Effects of flooding on the spatial distribution of soil seed and spore banks of native grasslands of the Pantanal wetland
Provedor de dados: 39
Autores: Oliveira,Patricia Carla de; Torezan,José Marcelo Domingues; Cunha,Catia Nunes da.
ABSTRACTTo better understand the role that flooding plays in shaping plant communities of native floodable grasslands of the Pantanal and to characterize the spatial distribution of plants, we present the results of a survey of soil seed and spore banks using the seedling emergence method. We hypothesized that terrain subjected to the deepest and longest flooding should have higher propagule abundance and richness. The species composition and distribution of seeds and spores in the soil were assessed at five sites using three sampling positions at each according to inundation intensity. In each sample position 2cm-thick soil samples were collected in quadrats to a depth of 10cm. Litter was also collected as an independent layer. Sample monitoring in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eleocharis minima; Eleocharis plicarhachis; Flooding; Grasslands; Isoetes pedersenii; Panicum laxum; Rotala mexicana; Sagittaria guayanensis; Soil seed and spore bank; Spatial distribution.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300400

Seed traits of species from South Brazilian grasslands with contrasting distribution
Provedor de dados: 39
Autores: 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

Factors influencing seed germination in Cerrado grasses
Provedor de dados: 39
Autores: 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

Tadpole of Pithecopus rusticus (Bruschi, Lucas, Garcia &amp;amp; Recco-Pimentel, 2014) (Anura, Phyllomedusidae): description of external morphology and natural history notes of a microendemic species
Provedor de dados: 49
Autores: 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