Alberto Soriano

Alberto Soriano
universidad La Salle, Oaxaca, Mexico

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18
Publications
2,051
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2,811
Citations
Citations since 2017
0 Research Items
703 Citations
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120

Publications

Publications (18)
Article
Résumé: ZusammenfassungDatura ferox seeds do not germinate when they are incubated intact and in darkness, even after 24 months of dry storage. If allowed to absorb water vapour for 3–4 weeks at 20°C, they lose dormancy, germinating even when incubated in darkness. The breakage of dormancy is directly related to the vapour pressure of the atmospher...
Article
Periodic long-lasting floods are a major component of the natural disturbance regime affecting grassland vegetation in the Flooding Pampa, Argentina. Chronic grazing by livestock imposes a different, and potentially conflicting, environmental constraint on vegetation structure in this system. Grazing reduces graminoid biomass and increases the abun...
Article
Natural flooding is one of the major factors affecting vegetation dynamics in many regions of the world. The Flooding Pampa Grasslands (Argentina) are frequently exposed to flooding events of diverse intensity and duration, some of which Leontodon taraxacoides, an exotic dicot. frequent in these grasslands, seems to survive. Its responses to four d...
Article
Full-text available
We studied the responses in growth and N content of the perennial grass Paspalum dilatatum to the substitution of Lotus tenuis for a whole group of species, the dicotyledons of a natural grassland community, in the Salado lowland Pampas of Argentina. Two kinds of manipulations were performed in the field: removal of alien dicots with herbicide appl...
Article
Full-text available
This paper presents, at regional level, a physionomic-floristic description of extra-andean Patagonia. We analysed the information with the greatest regional synthesis obtained in the last decades, specially the one that provided cartographic data. As a result of this synthesis, phytogeographical districts were subdivided, ecotones were delimited a...
Article
Strong fluctuations are exhibited by populations of the perennial herb Ambrosia tenuifolia in the grasslands of the Salado basin (Province of Buenos Aires, Argentina), an area frequently enduring prolonged floods. Flooding causes the death of most dicotyledon plants of the community, A. tenuifolia among them, opening numerous gaps of various sizes....
Article
Two patch types were recognized in the Occidental District of the Patagonian arid steppe: i) shrubs encircled by a ring of tussock grasses, and ii) tracts of scattered tussocks. Completeness of the ring of grasses around the three dominant shrubs was a function of shrub size. Average completeness was 62, 71 and 83%, respectively for the three domin...
Article
Functional characters are rarely taken into account in most vegetation classification systems. Ignoring these characters represents a major shortcoming when the dynamic aspects of ecosystems need to be recorded. In this paper we define vegetational and environmental units mainly from functional characters of the vegetation (namely the seasonal dyna...
Article
Full-text available
Two shrub species, dominant in western Patagonia, Argentina, exhibited different demographic behaviors under the effect of sheep grazing and of manipulated resource levels. Senecio filaginoides showed an increase in cover under increasing grazing pressures; the rise was explained by an increasing number of individuals and not by larger plants; this...
Article
The Patagonian steppe consists of shrubs encircled by relatively dense stands of grasses; the areas between shrubs have scattered tussocks, interspersed with bare soil. This study investigates the seed bank and the establishment of the perennial grass Bromus pictus around shrubs and in the scattered-tussock patches, with special attention to root c...
Article
Full-text available
Experiments were conducted in the Patagonian steppe in southern South America to test the following hypotheses: (a) grasses take up most of the water from the upper layers of the soil and utilize frequent and short-duration pulses of water availability; (b) shrubs, on the contrary, take up most of the water from the lower layers of the soil and uti...
Article
Full-text available
Changes in plant community structure are identified as a result of grazing in grasslands of the flooding pampa which evolved under supposedly light grazing conditions.The effect of excluding grazing upon total leaf area index was an increase of 30%. The largest response was observed in the distribution of leaves in the canopy. In the grazed areas,...
Article
The vegetation in the Coironal arid steppe consists of grasses and shrubs. The objective of this paper was to test Walter's hypothesis that woody vegetation and grasses compete for water in the upper layers of the soil, but woody vegetation has exclusive access to a source of water at deeper levels.Analysis of root profiles and patterns of leaf and...

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