Trampling enhances the dominance of graminoids over forbs in flooded grassland mesocosms
Questions: What are the interactive effects of flooding and cattle trampling upon the structural attributes and the floristic composition of a plant community? Do the effects on the plant community persist over an extended recovery period?. Location: Flooding Pampa grasslands, Argentina [36°30'...
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2011Striker2.pdf LINK AL EDITOR |
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| 245 | 1 | 0 | |a Trampling enhances the dominance of graminoids over forbs in flooded grassland mesocosms |
| 520 | |a Questions: What are the interactive effects of flooding and cattle trampling upon the structural attributes and the floristic composition of a plant community? Do the effects on the plant community persist over an extended recovery period?. Location: Flooding Pampa grasslands, Argentina [36°30' S, 58°30' W].Methods: We assessed the effects of 40-d of flooding, trampling and the combination thereof on plant cover and biomass, vertical distribution of foliage and floristic composition in lowland grassland mesocosms. We considered a 120-d recovery period to evaluate the persistence of flooding and trampling effects on the plant community. Results: Flooding, with or without trampling, increased cover and biomass of the graminoid species, especially marsh grasses, which developed a taller canopy, whereas most of the forb species were negatively affected. This was enhanced by trampling, as the aerial biomass of the dominant legume Lotus tenuis decreased by 90 percent , while three major forb species disappeared. Trampling under flooding conditions did not reduce the total above-ground biomass production, as the growth enhancement of graminoids was enough to compensate for the breakdown of the forbs. Below-ground biomass was lower when both perturbations occurred simultaneously. After 120-d of recovery, graminoids continued to be dominant while the remaining forbs [including L. tenuis] recovered only partially. Below-ground biomass recovered fully at the end of the growing season.Conclusions: The combination of flooding and trampling shifts the community co-dominance of graminoids and forbs towards a persistent dominance of graminoid species. When both perturbations are combined, the above-ground production of the grassland is unaffected and root biomass is rapidly recovered. However, the loss of the legume L. tenuis deserves attention because this is the unique nitrogen-fixing species of the ecosystem, which improves the forage quality for livestock production. | ||
| 653 | 0 | |a COMMUNITY STRUCTURE | |
| 653 | 0 | |a FLOODING | |
| 653 | 0 | |a GRASSLAND RECOVERY | |
| 653 | 0 | |a GRAZING | |
| 653 | 0 | |a LOTUS TENUIS | |
| 653 | 0 | |a TRAMPLING | |
| 653 | 0 | |a BOS | |
| 653 | 0 | |a HYMENACHNE | |
| 653 | 0 | |a POACEAE | |
| 700 | 1 | |9 11986 |a Striker, Gustavo Gabriel | |
| 700 | 1 | |9 67146 |a Mollard, Federico Pedro Otto | |
| 700 | 1 | |9 7964 |a Grimoldi, Agustín Alberto | |
| 700 | 1 | |9 3162 |a León, Rolando Juan Carlos | |
| 700 | 1 | |9 6462 |a Insausti, Pedro | |
| 773 | |t Applied Vegetation Science |g Vol.14, no.1 (2011), p.95-106 | ||
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| 900 | |a ^tTrampling enhances the dominance of graminoids over forbs in flooded grassland mesocosms | ||
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| 900 | |a ^tApplied Vegetation Science^cAppl. Veg. Sci. | ||
| 900 | |a en | ||
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| 900 | |a ^i | ||
| 900 | |a Vol. 14, no. 1 | ||
| 900 | |a 106 | ||
| 900 | |a COMMUNITY STRUCTURE | ||
| 900 | |a FLOODING | ||
| 900 | |a GRASSLAND RECOVERY | ||
| 900 | |a GRAZING | ||
| 900 | |a LOTUS TENUIS | ||
| 900 | |a TRAMPLING | ||
| 900 | |a BOS | ||
| 900 | |a HYMENACHNE | ||
| 900 | |a POACEAE | ||
| 900 | |a Questions: What are the interactive effects of flooding and cattle trampling upon the structural attributes and the floristic composition of a plant community? Do the effects on the plant community persist over an extended recovery period?. Location: Flooding Pampa grasslands, Argentina [36°30' S, 58°30' W].Methods: We assessed the effects of 40-d of flooding, trampling and the combination thereof on plant cover and biomass, vertical distribution of foliage and floristic composition in lowland grassland mesocosms. We considered a 120-d recovery period to evaluate the persistence of flooding and trampling effects on the plant community. Results: Flooding, with or without trampling, increased cover and biomass of the graminoid species, especially marsh grasses, which developed a taller canopy, whereas most of the forb species were negatively affected. This was enhanced by trampling, as the aerial biomass of the dominant legume Lotus tenuis decreased by 90 percent , while three major forb species disappeared. Trampling under flooding conditions did not reduce the total above-ground biomass production, as the growth enhancement of graminoids was enough to compensate for the breakdown of the forbs. Below-ground biomass was lower when both perturbations occurred simultaneously. After 120-d of recovery, graminoids continued to be dominant while the remaining forbs [including L. tenuis] recovered only partially. Below-ground biomass recovered fully at the end of the growing season.Conclusions: The combination of flooding and trampling shifts the community co-dominance of graminoids and forbs towards a persistent dominance of graminoid species. When both perturbations are combined, the above-ground production of the grassland is unaffected and root biomass is rapidly recovered. However, the loss of the legume L. tenuis deserves attention because this is the unique nitrogen-fixing species of the ecosystem, which improves the forage quality for livestock production. | ||
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