Unidades de vegetación de la Argentina

Oyarzábal, Mariano; Clavijo, José; Oakley, Luis J.; Biganzoli, Fernando; Tognetti, Pedro M.; Barberis, Ignacio M.; Maturo, Hernán M.; Aragón, Roxana; Campanello, Paula I.; Prado, Darién E.; Oesterheld, Martín; León, Rolando J.C.

doi:10.25260/ea.18.28.1.0.399

Cited by 487 publications

(412 citation statements)

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“…All sites belong to the Patagonian Phytogeographic Province (Oyarzabal et al, 2018). All sites belong to the Patagonian Phytogeographic Province (Oyarzabal et al, 2018).…”

Section: Study Sitementioning

confidence: 99%

“…Although there is a difference in altitude of 150 m among sites, all of them show similar radiation values and temperatures; radiation or temperature differences among sites are negligible relative to differences in precipitation. All sites belong to the Patagonian Phytogeographic Province (Oyarzabal et al, 2018). The low aridity site (Low) is a grass steppe representative of the Sub-Andean District and dominated by Festuca pallescens.…”

Section: Study Sitementioning

confidence: 99%

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Grazing pressure interacts with aridity to determine the development and diversity of biological soil crusts in Patagonian rangelands

et al. 2019

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Grazing is directly related to land degradation and desertification in global drylands.Grazing impacts on vascular plants, reasonably well-known, depend on its intensity and are modulated by local aridity conditions. However, we do not know how the interplay of grazing intensity and aridity affect biocrusts, topsoil assemblages dominated by cyanobacteria, lichens, and mosses that provide key ecosystem services in drylands. Here, we determined how grazing affects biomass, total cover, and richness of biocrust structural types across a regional aridity gradient in the Patagonian steppe. On average, grazing by sheep reduced biocrust biomass, total cover and richness of structural types by 55, 90, and 59%, respectively. In general, high grazing pressures had a larger impact on biocrusts than moderate or light grazing pressures.For example, biocrust cover was reduced by 85, 89, and 98% by light, moderate, and high grazing pressures, respectively. Although a slightly different response to grazing was observed under low aridity conditions, these more benign climatic conditions did not compensate for the negative effects of trampling by domestic animals on biocrusts.Nonetheless, estimated biocrust recovery rates under medium aridity conditions were faster than previously thought: it took 24, 18, and 58 years to double biocrust biomass, total cover, and richness of structural types. Sheep cannot be just removed in Patagonian rangelands because the production of meat and wool represents the main local economic activity. But landowners must consider our results to protect the ecosystem functions and services provided by biocrusts for future generations to come. K E Y W O R D Saridity, biocrusts, grazing intensity, Patagonian steppe, recovery rates

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“…All sites belong to the Patagonian Phytogeographic Province (Oyarzabal et al, 2018). All sites belong to the Patagonian Phytogeographic Province (Oyarzabal et al, 2018).…”

Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Grazing pressure interacts with aridity to determine the development and diversity of biological soil crusts in Patagonian rangelands

et al. 2019

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“…Engl. (Giorgis et al, 2011;Oyarzabal et al, 2018). En la actualidad se presenta como un mosaico de fisonomías en distintos estados sucesionales, con bosques abiertos a cerrados, matorrales, pastizales y roquedales (Cabido & Zak, 1999;Gavier-Pizarro & Bucher, 2004;Giorgis et al, 2017), con distintos grados de invasión de especies no nativas (Giorgis et al, 2011;Salazar et al, 2013).…”

Section: áRea De Estudiounclassified

Control mecánico del árbol no nativo Ligustrum lucidum (Oleaceae): supervivencia, regeneración y costos

Valfré-Giorello

Torres

Barri

et al. 2019

Bol. Soc. Argent. Bot.

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Background and Aims:There is an increasing demand of cost-benefit studies for the control of invasive non-native species. We assessed the efficiency of the application of mechanical control treatments on the non-native species Ligustrum lucidum, through resprouting and seedling regeneration, integrating cost and effort. M&M: The study involved 120 trees, to which we applied the following treatments: 1) control group, uncut trees, 2) felling, 3) felling and covering the stump with black polyethylene. Additionally, a half of the trees were selected in forest physiognomy and a half in shrubland physiognomy. We removed all seedlings smaller than 50 cm tall around each treated tree. Results: After 12 months, and two treatment applications, survival for the control group, felling, and felling with polyethylene cover was 100%, 95% and 68%, respectively. Resprout height was 78% and 95% lower under felling and felling with polyethylene cover treatments, respectively, than in the control group. Vegetation physiognomy had no effect on survival and resprout growth, while seedling regeneration was 300% higher in forest than in shrubland. The cost of application of felling with polyethylene cover was 150% higher than the cost of applying of felling only. Conclusions: To control L. lucidum, we recommend felling with polyethylene cover because the higher cost and effort is compensated by its greater efficacy in the reduction of survival and height. We recommend the manual removal of seedlings mainly in sites with a shrubland physiognomy and a low cover of adults of L. lucidum.reSumen Introducción y objetivos: Existe una creciente demanda de estudios que evalúen el costo-beneficio de la aplicación de técnicas de control de especies no nativas. Evaluamos la eficiencia de la aplicación de dos tratamientos de control mecánico sobre la especie no nativa Ligustrum lucidum, a través de la regeneración por rebrote y por semilla, integrando costos y esfuerzo. M&M: Asignamos 120 árboles a tres grupos de tratamientos: 1) testigo, sin tala ni aplicación de polietileno; 2) tala, y 3) tala con aplicación de polietileno sobre el tocón. Seleccionamos 60 árboles en fisonomía de bosque y 60 en fisonomía de matorral. Removimos manualmente todos los plantines menores a 50 cm alrededor de cada árbol tratado. Resultados: Transcurridos 12 meses y dos aplicaciones de tratamientos, la supervivencia de los testigos, tala y tala con polietileno fue 100%, 95% y 68%, respectivamente. La altura de los rebrotes en el tratamiento de tala y en el de tala con polietileno fue 78% y 95% menor respectivamente, comparado con los individuos testigos. La fisonomía del sitio solo influyó sobre la densidad de plantines, siendo 300% mayor en bosque que en matorrales. El costo del tratamiento tala con polietileno fue 150% mayor al costo del tratamiento tala, pero fue compensado por la mayor eficacia para reducir la supervivencia y la altura de rebrotes. Conclusiones: Debido a la mayor eficiencia, recomendamos la aplicación del tratamiento de tala con polietileno. Sugerimo...

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“…Al sudeste de la provincia de Formosa, dentro de la unidad biogeográfica del Chaco argentino (Cabrera 1971, Prado 1993; ver además 'Unidad 15' de Oyarzabal et al 2018), se encuentra la Reserva Natural El Bagual (REB, 26º10'53"S y 58º56'39"W, 68 m s.n.m. ), en la cual se llevó a cabo el estudio.…”

Section: Métodosunclassified

Tolerancia a diferentes condiciones controladas de irrigación en plántulas de especies leñosas, en relación con su distribución en el Chaco Oriental, Argentina

et al. 2019

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The eastern Formosa forests of Argentina, belonging to Eastern Chaco District, are distributed following a gradient from the watercourse levee where the 'Bosque Ribereño' is placed, through an intermediate zone where the so-called 'Bosque Transicional' develops, up to the topographically lower zone where the 'Monte Fuerte' forest is located. It has been postulated that the distribution of woody species amongst these three types of forests could be explained by their ability to survive to different stress conditions of water availability. In such context, it is proposed that, to the seedling status, that capacity could differ between species belonging to these forests, related to the topographic height of them. The tolerance to 'restricted watering' and 'flooding' controlled conditions in seedlings of eight selected woody species, (Peltophorum dubium, Enterolobium contortisiliquum, Gleditsia amorphoides, Microlobius foetidus, Diplokeleba floribunda, Caesalpinia paraguariensis, Prosopis nigra and Schinopsis balansae) belonging to the three forest types, was experimentally evaluated in this contribution. The results showed that the seedlings of all species were less tolerant to flooding prolonged conditions than to the 'drought' (restricted watering) level applied. None of them was affected in terms of growth under the 'restricted watering' treatment. In this way, the hypothesis could not be validated, nevertheless it is considered that such answer could be related to the fact these woody species usually thrive in the Seasonally Dry Tropical Forests domain.

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Unidades de vegetación de la Argentina

Cited by 487 publications

References 0 publications

Grazing pressure interacts with aridity to determine the development and diversity of biological soil crusts in Patagonian rangelands

Grazing pressure interacts with aridity to determine the development and diversity of biological soil crusts in Patagonian rangelands

Control mecánico del árbol no nativo Ligustrum lucidum (Oleaceae): supervivencia, regeneración y costos

Tolerancia a diferentes condiciones controladas de irrigación en plántulas de especies leñosas, en relación con su distribución en el Chaco Oriental, Argentina

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