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Registros recuperados: 13
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Ascenso hidráulico en y entre isletas de vegetación en la zona árida de Argentina Phyton
Bonvissuto,GL; Busso,CA.
Este estudio se llevó a cabo en el Monte Austral Neuquino (MAN), Provincia de Neuquén, Argentina (39o20' S; 69o19' O). La vegetación está distribuida sobre la superficie del suelo como isletas de vegetación. En el suelo de éstas isletas se pueden observar dos lugares superficiales muy contrastantes: ubicación1, debajo del follaje de las principales gramíneas perennes y arbustos más altos, y ubicación2, que incluye los corredores descubiertos de vegetación entre los parches vegetados. La hipótesis de éste trabajo fue que el fenómeno de ascenso hidráulico es de mayor magnitud debajo que entre isletas de vegetación en el MAN. Con este propósito, en cada una de dos isletas de vegetación se colocaron psicrómetros a termocupla debajo de los arbustos y en los...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atriplex lampa; Larrea divaricata; Leymus erianthus; Potencial hídrico; Stipa neaei.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572006000100006
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Axillary bud viability and dry matter production of Poa ligularis in Patagonian grasslands: (with 1 table & 4 figures) Phyton
Souto,CP; Becker,GF; Siffredi,GL; Busso,CA; Sternberg,M.
Poa ligularis Nees is one of the dominant perennial grass species in Patagonian grasslands. This is the first field study which investigated the effects of defoliation frequency on its number of viable axillary buds, and subsequent dry matter production during one growing season. Experiments were arranged in a randomized complete block design. Treatments included one defoliation height (10 cm), from one to five times a year, and undefoliated controls. Bud respiratory activity was examined usingthe tetrazolium test and the vital stain Evan's blue. At the end of the growing season, plants that have been defoliated more than three times showed significatively (p<0.05) lower number of respiratory active buds than unclipped controls. A high defoliation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Defoliation; Poa ligularis; Axillary buds; Semiarid Argentina; Dry matter production; Patagonia.
Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100004
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Contribution of different bud types to community regeneration on a typical steppe under various enclosure durations in Inner Mongolia, China Phyton
Qian,J; Wang,Z; Liu,Z; Kuang,W; Busso,CA.
Understanding the changes in the total bud bank, and its contribution to community regeneration, in response to grassland enclosure to livestock grazing, is crucial for grassland management. Despite its importance, the contribution of the total bud bank and that of different bud types to community regeneration as a whole have been rarely explored. The vegetative offspring recruited from different bud types was investigated in grasslands having different enclosure durations to livestock grazing on a typical steppe of Inner Mongolia, China. Total vegetative offspring density was significantly higher (p<0.05) under continuous grazing than in fenced grasslands, but no significant changes were found among plots with different enclosure durations to livestock...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grazing; Bud banks; Vegetative regeneration; Reproduction ecology; Restoration ecology.
Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200024
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Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis Phyton
Gittins,C; Busso,CA; Becker,G; Ghermandi,L; Siffredi,G.
Poa ligularis is an important forage in Patagonian rangelands. Populations of this perennial bunchgrass have been severely affected by overgrazing. We propose that increased defoliation frequencies will decrease (1) aerial- and belowground dry matter production, (2) root survival, and (3) concentration and content of total non-structural crown + root carbohydrates, and (4) increase root mortality. Five defoliation frequencies (plus 1 control) were applied in a representative grassland of the Occidental District in Patagonia during two consecutive growing seasons. All four hypotheses were rejected. Aerial and belowground dry matter production increased from one to two or three defoliations. Root production and dynamics were not affected by the study...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerial dry weight; Defoliation frequency; Perennial grasses; Poa ligularis; Root dynamics; Total non-structural carbohydrates.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100009
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Effects of grazing on plant species diversity and carbon partitioning in semiarid rangelands of northeastern China Phyton
Hu,FL; Liu,B; Liu,ZM; Fang,YT; Busso,CA.
Grasslands are one of the most widespread landscapes worldwide, covering approximately one-fifth of the world's land surface, where grazing is a common practice. How carbon storage responds to grazing in steppes remains poorly understood. We quantified the effects of grazing on community composition and species diversity, and carbon storage in two typical grasslands of northeastern China, one in Horqin and the other one in Hulunbeier. In both grasslands, grazing did not infuence plant species diversity. However, it substantially decreased aboveground carbon by 31% and 54% in Horqin and Hulunbeier, respectively. Fenced and grazing treatments showed a similar belowground carbon at both locations. The predominant carbon pool in the study grassland ecosystem...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Species diversity; Carbon allocation; Carbon stock; Optimal partitioning; Community heterogeneity; Soil depth.
Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100028
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Effects of various continuous cropping times on soil nematode structure in cotton fields of Xinjiang, China Phyton
Li,XL; Wang,YC; Busso,CA; Xiang,JS; Zhang,AM; Qu,YW; Liu,Y.
Long-term continuous cropping of cotton had led to substantial agricultural losses. However, continuous cotton cropping could maintain high crop yields for many years in some areas. The composition and structure of soil nematode communities were investigated to explore the effect of continuous cropping and soil depths on these communities. Soil samples were collected at two soil depths (0-20 cm and 20-40 cm) from cotton fields with a history of 5, 10, 15 or 20 years of continuous cotton cropping in the Karamay region. The results showed that 36 genera were found. Significant differences in the numbers of total nematodes and trophic groups were observed among continuous cropping times. The highest number of total nematodes was observed at 20-40 cm depth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nematode abundance; Continuous planting; Ecological indexes; Trophic groups; Soil depth.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100006
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Germination of grasses and shrubs under various water stress and temperature conditions: (With 4 Figures &amp; 2 Tables) Phyton
Bonvissuto,GL; Busso,CA.
The effects of various temperature combinations and water potentials were determined on the germination of Atriplex lampa Gill. ex Moquin, Larrea divaricata Cav., Leymus erianthus (Phil.) Dubcovsky, Stipa neaei Nees ex Steudel and Poa ligularis Nees ap. Steudel under controlled conditions. The tested hypothesis was that seed germination increases with increasing temperatures and water potentials in A. lampa, L. divaricata, L. erianthus, S. neaei and P. ligularis, and that time to reach 50% of total germination is greater at lower than higher water potentials. PEG 2000 was used to impose water stress conditions. In general, obtained results conducted to accept the posted hyphotesis.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water stress; Temperature; Germination index; Perennial grasses and shrubs; Arid Argentina.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100011
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Nitrogen deposition influences the response of Potentilla tanacetifolia to phosphorus addition Phyton
Yang,G; Zhang,Z; Zhang,G; Zhang,H; Han,X; Busso,CA.
Phosphorus is an essential macronutrient for all living plants and plant production. Simultaneously, atmospheric nitrogen deposition also affects plant productivity at a global scale. However, few studies have investigated how plants respond to P addition while simultaneously considering N deposition. We investigated plant biomass, nutrient status and stoichiometric ratios on Potentilla tanacetifolia in response to P fertilization under contrasting N addition rates in a typical meadow steppe in Inner Mongol ia, China. Aboveground biomass of P. tanacetifolia increased under increasing levels of P fertilization under conditions of N addition. However, there was no significant change in biomass when only phosphorus was added. Plant leaf and stem P...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitrogen; Phosphorus; N: P ratio; Plant organs.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100014
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Osmotic adjustment in Leymus cinereus cv. "Trailhead" under field conditions Phyton
Torres,YA; Busso,CA; Montenegro,OA; Giorgetti,HD; Rodríguez,HD; Bentivegna,D.
Osmotic adjustment has been recognized to be an important adaptive response to water stress in higher plants. Although Leymus cinereus cv. "Trailhead" is reputedly a very drought-tolerant rangeland plant, its ability to adjust osmotically in the field has not previously been reported. This study examined the occurrence or not of osmotic adjustment in field-grown plants of Leymus cinereus cv. "Trailhead" during late spring in an arid zone of Patagonia. Plants of this species had been established in the field three years before. With this purpose, leaf laminae of this species were collected and pressure-volume curves made. Results showed turgor maintenance in the face of declining leaf water potentials (i.e., osmotic adjustment) in the study species. Even...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Osmotic adjustment; Leymus cinereus cv. "Trailhead"; Water stress; Patagonia.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200013
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Perennial grass species richness and diversity on Argentine rangelands recovering from disturbance: (with 3 figures &#38; 5 tables) Phyton
Busso,CA; Giorgetti,HD; Montenegro,OA; Rodríguez,GD.
The influence of types of disturbance (hereon referred to as treatments) on natural vegetation was determined on richness and diversity of perennial grasses in semiarid rangelands of Argentina (40° 39'S, 62° 54'W). Studies were performed in adjacent areas which received different treatments: (1) untreated control; (2) burning; (3) herbicide application (shrub control); (4) Old Field 1 or (5) Old Field 2 (areas previously subjected to mechanical soil disturbance for 25 years; Old Field 1 had been exposed to a more severe grazing than Old Field 2 previous to cropping); and (6) overgrazing. During 1984-1992, annual aboveground biomass was determined per perennial grass species within each treatment after clipping permanent plots (n=30). Grass species richness...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina grasslands; Rangeland disturbances; Perennial grasses; Species richness and diversity.
Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100002
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Seed rain in and between vegetation patches in arid Patagonia, Argentina Phyton
Bonvissuto,GL; Busso,CA.
Seed rain has ecological consequences on plant community structure. This study was conducted in the Monte Austral Neuquino nearby the town of Picún Leufú, Province of Neuquén, Argentina, within an area of 15 km x 15 km (39º 20 32' S; 69º19 30' W). Studies were conducted at two sites, distant 1.5 km from one another. Vegetation is distributed on the soil surface as vegetation patches. Four superficial locations may be found in the soil of these patches: location 1, small dune accumulated under the lee; location 2, found at the edge of the small dune, and below the major grass canopies and tallest shrubs; location 3, located at the edge of the vegetation patch, and location 4 which includes the uncovered corridors among vegetation patches. Seed rain was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Seed rain; Shrub and grass species; Vegetation patches; Arid Argentina.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100005
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Uso de la cámara de presión y los psicrómetros a termocupla en la determinación de las relaciones hídricas en tejidos vegetales Phyton
Busso,CA.
En este trabajo se discuten las ventajas, desventajas y precauciones en la utilización de la cámara de presión y los psicrómetros a termocupla para medir el potencial hídrico y las presiones, osmótica y de turgencia, de tejidos vegetales. La comparación de los resultados obtenidos con los dos instrumentos puede ser afectada por la técnica utilizada en el muestreo, el grado de consistencia en el muestreo y en el procedimiento de medición, y errores inherentes al método mismo. Las mediciones de potencial hídrico bajo condiciones de campo en las plantas o en el suelo con psicrómetros a termocupla son probablemente inútiles, o aún peor, pueden ser falsas. El uso de los psicrómetros a termocupla está estrictamente limitado a condiciones de laboratorio, donde se...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cámara de presión; Psicrómetros a termocupla; Curvas Presión-Volumen; Potencial hídrico; Presiones osmótica y de turgencia.
Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572008000100027
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Vegetation response to a controlled fire in the Phytogeographical Province of the Monte, Argentina Phyton
Peláez¹,DV; Giorgetti,HD; Montenegro,OA; Elia,OR; Rodríguez,GD; Bóo,RM; Mayor,MD; Busso,CA.
Fire is a major ecological process within most terrestrial ecosystems. Therefore, understanding the vegetation response to fire is essential to its management. Our objective was to study the effect of a controlled fire, conducted at the end of summer season, on cover and density of the most common woody and herbaceous species in Phytogeographical Province of the Monte, Argentina. In general, after the control fire, the woody species mean percentage cover was significantly lower (p<0.05) in the fire treatment than in the control (no controlled fire). This effect was persistent during the study period. No significant differences (p&gt;0.05) were detected in woody species mean density among treatments throughout the whole study. Desirable perennial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Controlled fire; Desirable grasses; Undesirable woody species; Monte region; Argentina.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200009
Registros recuperados: 13
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