Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease
The forests of Austrocedrus chilensis in the Patagonian Andes suffer a disease known as “mal del ciprés”. The purpose of this work was to identify the relationship between A. chilensis seedling recruitment and disturbances (i.e., disease and cattle grazing), and to identify associations between seedling recruitment and microsite characteristics related to the disturbances. Eighteen sites with “mal del ciprés” were selected for study. In each site, symptomatic and asymptomatic plots were established and characterized. Five control sites, where the disease was totally absent, were also included. Cattle use and disease were negatively associated with A. chilensis natural regeneration. Both disturbances seemed to act synergically. In control sites the abundance of seedlings was never null and reached greater values with low cattle use. In symptomatic and asymptomatic plots of diseased forests, seedling abundance tended to be lower than in control forests and was generally null when cattle use was high. The disease was associated with microsite features such as low canopy cover, organic horizon thickness and high understory cover. Although these site conditions were negatively associated with seedling abundance, they could not completely explain the variation found in seedling recruitment.
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Asociación Argentina de Ecología
2008
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rev-ecoaus-article-13952020-11-07T15:48:46Z Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease Reclutamiento de renovales de Austrocedrus chilensis en relación al uso ganadero, los factores de micrositio y la sanidad del bosque La Manna, Ludmila Collantes, Marta Bava, José Rajchenberg, Mario forest decline “mal del ciprés” natural regeneration site effect declinación del bosque “mal del ciprés” regeneración natural sitio The forests of Austrocedrus chilensis in the Patagonian Andes suffer a disease known as “mal del ciprés”. The purpose of this work was to identify the relationship between A. chilensis seedling recruitment and disturbances (i.e., disease and cattle grazing), and to identify associations between seedling recruitment and microsite characteristics related to the disturbances. Eighteen sites with “mal del ciprés” were selected for study. In each site, symptomatic and asymptomatic plots were established and characterized. Five control sites, where the disease was totally absent, were also included. Cattle use and disease were negatively associated with A. chilensis natural regeneration. Both disturbances seemed to act synergically. In control sites the abundance of seedlings was never null and reached greater values with low cattle use. In symptomatic and asymptomatic plots of diseased forests, seedling abundance tended to be lower than in control forests and was generally null when cattle use was high. The disease was associated with microsite features such as low canopy cover, organic horizon thickness and high understory cover. Although these site conditions were negatively associated with seedling abundance, they could not completely explain the variation found in seedling recruitment. Los bosques de Austrocedrus chilensis en los Andes Patagónicos sufren una enfermedad conocida como “mal del ciprés”. Los objetivos de este trabajo fueron identificar la relación entre el reclutamiento de renovales de A. chilensis y los disturbios (i.e., enfermedad y uso ganadero) e identificar asociaciones entre la abundancia de renovales y características del micrositio relacionadas con los disturbios. Dieciocho sitios con “mal del ciprés” fueron seleccionados para el estudio. En cada sitio, se establecieron y caracterizaron parcelas sintomáticas y asintomáticas. Cinco bosques control, donde la enfermedad estuvo completamente ausente, fueron también incluidos. El uso ganadero y la enfermedad estuvieron negativamente asociados con la regeneración de A. chilensis. Ambos disturbios actuarían en forma sinérgica. En los bosques control la abundancia de renovales nunca fue nula y alcanzó valores más altos cuando el uso ganadero era bajo. En las parcelas sintomáticas y asintomáticas de bosques enfermos la abundancia de regeneración tendió a ser menor que en los bosques control y resultó generalmente nula cuando el uso ganadero fue alto. La enfermedad estuvo asociada a ciertas características del micrositio, como baja cobertura del dosel, escaso espesor del horizonte orgánico y alta cobertura del sotobosque. Si bien estas características del micrositio estuvieron negativamente asociadas con la abundancia de renovales, no pueden explicar por sí solas la variación hallada en el reclutamiento de renovales. Asociación Argentina de Ecología 2008-04-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículos application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1395 Ecología Austral; Vol. 18 No. 1 (2008); 027-041 Ecología Austral; Vol. 18 Núm. 1 (2008); 027-041 0327-5477 1667-7838 eng https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1395/756 Derechos de autor 2020 Ecología Austral |
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Asociación Argentina de Ecología |
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La Manna, Ludmila Collantes, Marta Bava, José Rajchenberg, Mario |
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La Manna, Ludmila Collantes, Marta Bava, José Rajchenberg, Mario Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease |
author_facet |
La Manna, Ludmila Collantes, Marta Bava, José Rajchenberg, Mario |
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La Manna, Ludmila |
title |
Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease |
title_short |
Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease |
title_full |
Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease |
title_fullStr |
Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease |
title_full_unstemmed |
Seedling recruitment of Austrocedrus chilensis in relation to cattle use, microsite environment and forest disease |
title_sort |
seedling recruitment of austrocedrus chilensis in relation to cattle use, microsite environment and forest disease |
description |
The forests of Austrocedrus chilensis in the Patagonian Andes suffer a disease known as “mal del ciprés”. The purpose of this work was to identify the relationship between A. chilensis seedling recruitment and disturbances (i.e., disease and cattle grazing), and to identify associations between seedling recruitment and microsite characteristics related to the disturbances. Eighteen sites with “mal del ciprés” were selected for study. In each site, symptomatic and asymptomatic plots were established and characterized. Five control sites, where the disease was totally absent, were also included. Cattle use and disease were negatively associated with A. chilensis natural regeneration. Both disturbances seemed to act synergically. In control sites the abundance of seedlings was never null and reached greater values with low cattle use. In symptomatic and asymptomatic plots of diseased forests, seedling abundance tended to be lower than in control forests and was generally null when cattle use was high. The disease was associated with microsite features such as low canopy cover, organic horizon thickness and high understory cover. Although these site conditions were negatively associated with seedling abundance, they could not completely explain the variation found in seedling recruitment. |
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Asociación Argentina de Ecología |
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2008 |
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https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1395 |
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