Floristic associations and filtering ability of riparian vegetation strips

• Autores: Giaccio, Gustavo Carlos María; Laterra, Pedro; Cabria, Fabián Néstor
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Comunidades ribereñas; Arroyos pampeanos; Filtrado de escorrentía superficial; Servicios ecosistémicos; Asociaciones ribereñas; Franjas de vegetación ribereñas; Ecosistemas ribereños
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

The analysis of lateral flow runoff of superficial nutrients and sediments from an agricultural origin and their retention by infiltration of riparian vegetation strips are of great importance in reducing the agricultural externalities on surface water quality. The aim of this study was to relate soil infiltration to the main biophysical properties of riparian environments in the Pampa Austral of Argentina, defined by the composition of its plant community and the coverage of exotic species. We explored the relationships between hydraulic conductivity (Ks ) and aboveground, litter and root biomasses, organic matter concentration, terrain slope, soil bulk density, texture and electrical conductivity. We determined eight floristic associations through the classification of 65 censuses of vegetation. Three of the associations were dominated by native grasses, three by exotic grasses and two presented a layer of exotic willow trees in combination with native and invasive grasses. The mean Ks in soils from the floristic associations with trees and from the associations of native grasses without trees were higher than in soils from the associations of exotic grasses without trees. Significant relationships were found between Ks and the soil properties that are sensitive to the influence of vegetation, suggesting that the relationships between floristic composition and infiltration could be explained partly due to causal relationships.
The analysis of lateral flow runoff of superficial nutrientsand sediments from an agricultural origin and their retentionby infiltration of riparian vegetation strips are of great importancein reducing the agricultural externalities on surface water quality.The aim of this study was to relate soil infiltration to the main biophysicalproperties of riparian environments in the Pampa Australof Argentina, defined by the composition of its plant communityand the coverage of exotic species. We explored the relationships betweenhydraulic conductivity (Ks) and aboveground, litter and rootbiomasses, organic matter concentration, terrain slope, soil bulk density,texture and electrical conductivity. We determined eight floristicassociations through the classification of 65 censuses of vegetation.Three of the associations were dominated by native grasses, threeby exotic grasses and two presented a layer of exotic willow trees incombination with native and invasive grasses. The mean Ks in soilsfrom the floristic associations with trees and from the associationsof native grasses without trees were higher than in soils from theassociations of exotic grasses without trees. Significant relationshipswere found between Ks and the soil properties that are sensitive tothe influence of vegetation, suggesting that the relationships betweenfloristic composition and infiltration could be explained partly due tocausal relationships.
Fil: Giaccio, Gustavo Carlos María. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Barrow; Argentina
Fil: Laterra, Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Fundación Bariloche; Argentina
Fil: Cabria, Fabián Néstor. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina