Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species
Interventions needed for degraded natural ecosystems rehabilitation create an opportunity for the establishment of exotic species. In caldén woodland areas in the semi-arid Pampas region, proven techniques for grassland recovery generate disturbances of varying intensity, ranging from soil removal with the total elimination of plant cover to partial aerial phytomass reduction. The objective was to evaluate the exotic plants species entry in communities subjected to different interventions and their permanence at different times from the last intervention. Treatments included bulldozer with rake, roller, and a prescribed burn. For the bulldozer intervention, the control and disturbed treatments were defined. For the rest, the following were established: control, burned, rolled and rolled + burned. In each of them, a gradient from the edge to the interior of the community was considered. For the capped areas, evaluations were carried out after one year, at five for the rolled ones and at three for the burned and rolled + burned ones. Coverage of species in the grassy-herbaceous stratum, total cover of vegetation and brush, and proportion of soil without cover were determined. A total of 79 species were recorded, 23% were exotic. In the bulldozer intervened areas, its proportion reached 33% (23% in the control). In the other interventions, their contribution was 26% in rolling, 21% in burning, and 28% in rolled+burned (18% in the control). Regarding the intensity of the disturbance, in those rolled areas or intervened with a bulldozer, the exotic species proportion was higher. The areas towards inside community and without disturbance (or with low intensity disturbances [e.g., prescribed burns]) showed a lower invasion level. After five years the communities recovered the coverage of the perennial grasses of the grassland, but a high proportion of exotics that exceeds that registered in the control one.
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Asociación Argentina de Ecología
2022
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Suárez, Carla E. Estelrich, Héctor E. Morici, Ernesto F. A. Ernst, Ricardo D. |
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Suárez, Carla E. Estelrich, Héctor E. Morici, Ernesto F. A. Ernst, Ricardo D. Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species |
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Suárez, Carla E. Estelrich, Héctor E. Morici, Ernesto F. A. Ernst, Ricardo D. |
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Suárez, Carla E. |
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Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species |
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Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species |
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Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species |
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Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species |
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Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species |
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interventions for the rehabilitation of degraded silvopastoral systems: an opportunity for alien plants species |
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Interventions needed for degraded natural ecosystems rehabilitation create an opportunity for the establishment of exotic species. In caldén woodland areas in the semi-arid Pampas region, proven techniques for grassland recovery generate disturbances of varying intensity, ranging from soil removal with the total elimination of plant cover to partial aerial phytomass reduction. The objective was to evaluate the exotic plants species entry in communities subjected to different interventions and their permanence at different times from the last intervention. Treatments included bulldozer with rake, roller, and a prescribed burn. For the bulldozer intervention, the control and disturbed treatments were defined. For the rest, the following were established: control, burned, rolled and rolled + burned. In each of them, a gradient from the edge to the interior of the community was considered. For the capped areas, evaluations were carried out after one year, at five for the rolled ones and at three for the burned and rolled + burned ones. Coverage of species in the grassy-herbaceous stratum, total cover of vegetation and brush, and proportion of soil without cover were determined. A total of 79 species were recorded, 23% were exotic. In the bulldozer intervened areas, its proportion reached 33% (23% in the control). In the other interventions, their contribution was 26% in rolling, 21% in burning, and 28% in rolled+burned (18% in the control). Regarding the intensity of the disturbance, in those rolled areas or intervened with a bulldozer, the exotic species proportion was higher. The areas towards inside community and without disturbance (or with low intensity disturbances [e.g., prescribed burns]) showed a lower invasion level. After five years the communities recovered the coverage of the perennial grasses of the grassland, but a high proportion of exotics that exceeds that registered in the control one. |
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Asociación Argentina de Ecología |
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2022 |
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https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/2022 |
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rev-ecoaus-article-20222023-11-02T15:27:25Z Interventions for the rehabilitation of degraded silvopastoral systems: An opportunity for alien plants species Intervenciones para rehabilitar sistemas silvopastoriles degradados: Una oportunidad para las especies vegetales exóticas Suárez, Carla E. Estelrich, Héctor E. Morici, Ernesto F. A. Ernst, Ricardo D. rolled bulldozed prescribed fire bulldozed weed flora caldén encroachment rolado quema prescripta topadora con rastrillo flora arvense fachinales Interventions needed for degraded natural ecosystems rehabilitation create an opportunity for the establishment of exotic species. In caldén woodland areas in the semi-arid Pampas region, proven techniques for grassland recovery generate disturbances of varying intensity, ranging from soil removal with the total elimination of plant cover to partial aerial phytomass reduction. The objective was to evaluate the exotic plants species entry in communities subjected to different interventions and their permanence at different times from the last intervention. Treatments included bulldozer with rake, roller, and a prescribed burn. For the bulldozer intervention, the control and disturbed treatments were defined. For the rest, the following were established: control, burned, rolled and rolled + burned. In each of them, a gradient from the edge to the interior of the community was considered. For the capped areas, evaluations were carried out after one year, at five for the rolled ones and at three for the burned and rolled + burned ones. Coverage of species in the grassy-herbaceous stratum, total cover of vegetation and brush, and proportion of soil without cover were determined. A total of 79 species were recorded, 23% were exotic. In the bulldozer intervened areas, its proportion reached 33% (23% in the control). In the other interventions, their contribution was 26% in rolling, 21% in burning, and 28% in rolled+burned (18% in the control). Regarding the intensity of the disturbance, in those rolled areas or intervened with a bulldozer, the exotic species proportion was higher. The areas towards inside community and without disturbance (or with low intensity disturbances [e.g., prescribed burns]) showed a lower invasion level. After five years the communities recovered the coverage of the perennial grasses of the grassland, but a high proportion of exotics that exceeds that registered in the control one. Las intervenciones para rehabilitar ecosistemas naturales degradados generan una oportunidad para el establecimiento de especies exóticas. En áreas de bosque de caldén, en la región semiárida pampeana, las técnicas probadas para recuperar el pastizal generan disturbios de distinta intensidad, desde remoción del suelo con eliminación total de la vegetación hasta disminución parcial de la fitomasa. El objetivo fue evaluar el ingreso y permanencia de especies vegetales exóticas en comunidades sometidas a distintas intervenciones, en diferentes momentos a partir de la última intervención. Los tratamientos incluyeron topadora con rastrillo, rolo y una quema prescripta. Para la intervención con topadora se definieron los tratamientos testigo y disturbado. Para las restantes, se establecieron: testigo, quemado, rolado y rolado+quemado. En cada tratamiento se consideró un gradiente desde el borde hacia el interior de la comunidad. Las evaluaciones se realizaron al año para las áreas topadas, a los cinco para las roladas y a los tres para las quemadas y roladas+quemadas. Se determinó cobertura de especies en el estrato graminoso-herbáceo, cobertura total de vegetación y de broza, y proporción de suelo sin cobertura. Se registraron 79 especies, de las cuales 23% fueron exóticas. En las áreas intervenidas con topadora su proporción alcanzó el 33% (23% en el testigo). En las restantes intervenciones, su contribución fue del 26% en el rolado, 21% en el quemado y 28% en rolado+quemado (18% en el testigo). En cuanto a la intensidad del disturbio, en aquellas áreas roladas o intervenidas con topadora, la proporción de especies exóticas fue mayor. Las áreas hacia el interior de la comunidad y sin disturbio (o bien con disturbios de baja intensidad [e.g., quemas prescriptas]) presentaron un menor nivel de invasión. Luego de cinco años, las comunidades recuperaron la cobertura de las gramíneas perennes del pastizal, pero presentan una proporción elevada de exóticas que supera a la registrada en el testigo. Asociación Argentina de Ecología 2022-11-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículos application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/2022 10.25260/EA.22.32.3.0.2022 Ecología Austral; Vol. 32 No. 3 (2022): December 2022. Pages 821-1149; 1106-1119 Ecología Austral; Vol. 32 Núm. 3 (2022): December 2022. Pages 821-1149; 1106-1119 0327-5477 1667-7838 spa https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/2022/1324 Derechos de autor 2022 Carla E. Suárez, Héctor E. Estelrich, Ernesto F. A. Morici, Ricardo D. Ernst https://creativecommons.org/licenses/by/3.0/ |