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Biblioteca (s) : |
INIA Treinta y Tres. |
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Fecha : |
14/11/2022 |
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Actualizado : |
14/11/2022 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
PAÑELLA, P.G.; GUIDO, A.; JAURENA, M.; CARDOZO, G.; LEZAMA, F. |
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Afiliación : |
PEDRO G. PAÑELLA, Departamento de Sistemas Ambientales, Facultad de Agronomía, Universidad de la República, Montevideo, Uruguay; ANACLARA GUIDO, Instituto de Ecología y Ciencias Ambientales, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.; MARTIN ALEJANDRO JAURENA BARRIOS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; GERONIMO AGUSTIN CARDOZO CABANELAS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; FELIPE LEZAMA, Departamento de Sistemas Ambientales, Facultad de Agronomía, Universidad de la República, Montevideo, Uruguay. |
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Título : |
Fertilization and overseeding legumes on native grasslands leads to a hardly reversible degraded state. |
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Fecha de publicación : |
2022 |
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Fuente / Imprenta : |
Applied Vegetation Science, 2022, https://doi.org/10.1111/avsc.12693 (In press). |
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DOI : |
10.1111/avsc.12693 |
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Idioma : |
Inglés |
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Notas : |
Funding information: INNOVAGRO project 148811, ANII. Comisión Sectorial de Investigación Científica - UdelaR (Grupo I+D 433).
Article history: First Publication, 25 October 2022. |
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Contenido : |
Diverse practices related to livestock intensification often have a deep impact on grassland diversity. Moreover, alternative degraded states that are hardly reversible can be observed, resulting in low-diversity communities, dominated by invasive alien species. Therefore, the need arises to understand aboveground vegetation dynamics in these communities, and the potential of the seed bank to revert this degradation. In this study, we evaluated the impact of overseeding alien legumes coupled with phosphorus fertilization over natural grasslands, in terms of aboveground vegetation composition and soil seed bank. This was performed in a long-term experiment (23 years) in eastern Uruguay with three treatments: (1) native grasslands and native grasslands overseeded with alien legumes and fertilized at a (2) moderate or (3) high phosphorus dosage. Vegetation surveys were done in 2009 and 2019 to evaluate changes, and the seed bank was sampled in 2019. Native grasslands had higher total richness, native species richness and abundance for both years, as well as a higher species turnover in both temporal and spatial dimensions. The dominant species in overseeded treatments was the invasive alien grass Cynodon dactylon. The seed bank was similar between treatments in terms of seed density and richness, but differed in composition, with a higher abundance of alien species in the overseeded grassland. Seed banks showed low similarity with the aboveground vegetation. The overseeded grassland appears to be in a degraded state of low species diversity, with low turnover and invaded by alien species. The seeds in the soil appear to be insufficient to revert this condition and might be a hindrance for restoration due to the high abundance of alien species. Grasslands that have been degraded by long periods of fertilization and overseeding legumes present a great challenge for ecological restoration, since invasive alien species should be controlled before native species are reintroduced. MenosDiverse practices related to livestock intensification often have a deep impact on grassland diversity. Moreover, alternative degraded states that are hardly reversible can be observed, resulting in low-diversity communities, dominated by invasive alien species. Therefore, the need arises to understand aboveground vegetation dynamics in these communities, and the potential of the seed bank to revert this degradation. In this study, we evaluated the impact of overseeding alien legumes coupled with phosphorus fertilization over natural grasslands, in terms of aboveground vegetation composition and soil seed bank. This was performed in a long-term experiment (23 years) in eastern Uruguay with three treatments: (1) native grasslands and native grasslands overseeded with alien legumes and fertilized at a (2) moderate or (3) high phosphorus dosage. Vegetation surveys were done in 2009 and 2019 to evaluate changes, and the seed bank was sampled in 2019. Native grasslands had higher total richness, native species richness and abundance for both years, as well as a higher species turnover in both temporal and spatial dimensions. The dominant species in overseeded treatments was the invasive alien grass Cynodon dactylon. The seed bank was similar between treatments in terms of seed density and richness, but differed in composition, with a higher abundance of alien species in the overseeded grassland. Seed banks showed low similarity with the aboveground vegetation. The overseede... Presentar Todo |
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Palabras claves : |
DIVERSITY; FERTILIZATION; INVASION; OVERSEEDED; RESTORATION. |
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Asunto categoría : |
H01 Protección de plantas - Aspectos generales |
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Marc : |
LEADER 02903naa a2200253 a 4500
001 1063719
005 2022-11-14
008 2022 bl uuuu u00u1 u #d
024 7 $a10.1111/avsc.12693$2DOI
100 1 $aPAÑELLA, P.G.
245 $aFertilization and overseeding legumes on native grasslands leads to a hardly reversible degraded state.
260 $c2022
500 $aFunding information: INNOVAGRO project 148811, ANII. Comisión Sectorial de Investigación Científica - UdelaR (Grupo I+D 433). Article history: First Publication, 25 October 2022.
520 $aDiverse practices related to livestock intensification often have a deep impact on grassland diversity. Moreover, alternative degraded states that are hardly reversible can be observed, resulting in low-diversity communities, dominated by invasive alien species. Therefore, the need arises to understand aboveground vegetation dynamics in these communities, and the potential of the seed bank to revert this degradation. In this study, we evaluated the impact of overseeding alien legumes coupled with phosphorus fertilization over natural grasslands, in terms of aboveground vegetation composition and soil seed bank. This was performed in a long-term experiment (23 years) in eastern Uruguay with three treatments: (1) native grasslands and native grasslands overseeded with alien legumes and fertilized at a (2) moderate or (3) high phosphorus dosage. Vegetation surveys were done in 2009 and 2019 to evaluate changes, and the seed bank was sampled in 2019. Native grasslands had higher total richness, native species richness and abundance for both years, as well as a higher species turnover in both temporal and spatial dimensions. The dominant species in overseeded treatments was the invasive alien grass Cynodon dactylon. The seed bank was similar between treatments in terms of seed density and richness, but differed in composition, with a higher abundance of alien species in the overseeded grassland. Seed banks showed low similarity with the aboveground vegetation. The overseeded grassland appears to be in a degraded state of low species diversity, with low turnover and invaded by alien species. The seeds in the soil appear to be insufficient to revert this condition and might be a hindrance for restoration due to the high abundance of alien species. Grasslands that have been degraded by long periods of fertilization and overseeding legumes present a great challenge for ecological restoration, since invasive alien species should be controlled before native species are reintroduced.
653 $aDIVERSITY
653 $aFERTILIZATION
653 $aINVASION
653 $aOVERSEEDED
653 $aRESTORATION
700 1 $aGUIDO, A.
700 1 $aJAURENA, M.
700 1 $aCARDOZO, G.
700 1 $aLEZAMA, F.
773 $tApplied Vegetation Science, 2022, https://doi.org/10.1111/avsc.12693 (In press).
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Registro completo
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Biblioteca (s) : |
INIA Treinta y Tres. |
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Fecha actual : |
18/04/2022 |
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Actualizado : |
18/04/2022 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Circulación / Nivel : |
Internacional - -- |
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Autor : |
LEZAMA, F.; PARUELO, J. |
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Afiliación : |
FELIPE LEZAMA, Department of Environmental Systems, Faculty of Agronomy, University of República, Montevideo, Uruguay.; JOSÉ PARUELO, Institute of Ecology and Environmental Sciences, Faculty of Sciences, UDELAR, UY. Department of Quantitative Methods and Information Systems, FAGRO, UY. INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
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Título : |
Regional assessment of stocking rate effects on uruguayan rangelands: a ranch-level study. |
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Fecha de publicación : |
2022 |
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Fuente / Imprenta : |
Rangeland Ecology & Management, 2022, volume 82, pages 58-65. Doi: https://doi.org/10.1016/j.rama.2022.02.005 |
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DOI : |
10.1016/j.rama.2022.02.005 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 27 April 2021 // Revised 9 February 2022 // Accepted 16 February 2022. |
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Contenido : |
We analyzed the variation of plant composition, forage production, and livestock diet across a broad stocking rate gradient on Eastern Hills rangelands of Uruguay. Our approach encompassed five ranches subjected to mixed sheep-cattle grazing and combined field surveys, microhistological fecal analysis, and remote sensing techniques. We hypothesized that selectivity would decrease as stocking rate increased. Vegetation data and fecal samples were obtained in 17 paddocks in 2008. To investigate the role of stocking rate on vegetation, we focused on dominant species and forage type cover. Diet composition was analyzed at forage type level. Annual net primary productivity was estimated for each paddock using the normalized difference vegetation index derived from the MODIS (Moderate Resolution Imaging Spectroradiometer) sensor. We found a clear relationship between the variation in stocking rate and floristic and forage type composition, both suggesting a deterioration of grassland conservation status. Cool season grass cover varied from 25% to 5%, from low to high stocking rates. Dicot cover showed an opposite trend, with values around 15% in the low and moderate stocking levels and reaching 35% on high-stocked paddocks. Diet composition and diet overlap between herbivores also showed clear patterns of response to stocking rate. On the other hand, livestock selectivity interacted with herbivore type. While cattle showed the expected pattern, sheep did not decrease selectivity in winter as stocking rate increased. Contrary to expectations, annual net primary productivity was similar across the different stocking rate levels and the month of maximum productivity was generally March. Our study provides strong evidence of marked rangeland degradation; however, the lack of response in terms of ANPP and the ability of sheep to maintain selectivity under high stocking rates could help to explain the lack of responsiveness in the adoption of generalized stocking adjustments by the ranchers. MenosWe analyzed the variation of plant composition, forage production, and livestock diet across a broad stocking rate gradient on Eastern Hills rangelands of Uruguay. Our approach encompassed five ranches subjected to mixed sheep-cattle grazing and combined field surveys, microhistological fecal analysis, and remote sensing techniques. We hypothesized that selectivity would decrease as stocking rate increased. Vegetation data and fecal samples were obtained in 17 paddocks in 2008. To investigate the role of stocking rate on vegetation, we focused on dominant species and forage type cover. Diet composition was analyzed at forage type level. Annual net primary productivity was estimated for each paddock using the normalized difference vegetation index derived from the MODIS (Moderate Resolution Imaging Spectroradiometer) sensor. We found a clear relationship between the variation in stocking rate and floristic and forage type composition, both suggesting a deterioration of grassland conservation status. Cool season grass cover varied from 25% to 5%, from low to high stocking rates. Dicot cover showed an opposite trend, with values around 15% in the low and moderate stocking levels and reaching 35% on high-stocked paddocks. Diet composition and diet overlap between herbivores also showed clear patterns of response to stocking rate. On the other hand, livestock selectivity interacted with herbivore type. While cattle showed the expected pattern, sheep did not decrease selectivity i... Presentar Todo |
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Palabras claves : |
(NDVI); EASTERN HILLS; FORAGE TYPES; LIVESTOCK DIET; MICROHISTOLOGICAL TECHNIQUE; NORMALIZED DIFFERENCE VEGETATION INDEX; PLANT COMPOSITION. |
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Asunto categoría : |
F40 Ecología vegetal |
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Marc : |
LEADER 02892naa a2200241 a 4500
001 1063033
005 2022-04-18
008 2022 bl uuuu u00u1 u #d
024 7 $a10.1016/j.rama.2022.02.005$2DOI
100 1 $aLEZAMA, F.
245 $aRegional assessment of stocking rate effects on uruguayan rangelands$ba ranch-level study.$h[electronic resource]
260 $c2022
500 $aArticle history: Received 27 April 2021 // Revised 9 February 2022 // Accepted 16 February 2022.
520 $aWe analyzed the variation of plant composition, forage production, and livestock diet across a broad stocking rate gradient on Eastern Hills rangelands of Uruguay. Our approach encompassed five ranches subjected to mixed sheep-cattle grazing and combined field surveys, microhistological fecal analysis, and remote sensing techniques. We hypothesized that selectivity would decrease as stocking rate increased. Vegetation data and fecal samples were obtained in 17 paddocks in 2008. To investigate the role of stocking rate on vegetation, we focused on dominant species and forage type cover. Diet composition was analyzed at forage type level. Annual net primary productivity was estimated for each paddock using the normalized difference vegetation index derived from the MODIS (Moderate Resolution Imaging Spectroradiometer) sensor. We found a clear relationship between the variation in stocking rate and floristic and forage type composition, both suggesting a deterioration of grassland conservation status. Cool season grass cover varied from 25% to 5%, from low to high stocking rates. Dicot cover showed an opposite trend, with values around 15% in the low and moderate stocking levels and reaching 35% on high-stocked paddocks. Diet composition and diet overlap between herbivores also showed clear patterns of response to stocking rate. On the other hand, livestock selectivity interacted with herbivore type. While cattle showed the expected pattern, sheep did not decrease selectivity in winter as stocking rate increased. Contrary to expectations, annual net primary productivity was similar across the different stocking rate levels and the month of maximum productivity was generally March. Our study provides strong evidence of marked rangeland degradation; however, the lack of response in terms of ANPP and the ability of sheep to maintain selectivity under high stocking rates could help to explain the lack of responsiveness in the adoption of generalized stocking adjustments by the ranchers.
653 $a(NDVI)
653 $aEASTERN HILLS
653 $aFORAGE TYPES
653 $aLIVESTOCK DIET
653 $aMICROHISTOLOGICAL TECHNIQUE
653 $aNORMALIZED DIFFERENCE VEGETATION INDEX
653 $aPLANT COMPOSITION
700 1 $aPARUELO, J.
773 $tRangeland Ecology & Management, 2022, volume 82, pages 58-65. Doi: https://doi.org/10.1016/j.rama.2022.02.005
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