EARLY DEVELOPMENT OF NOTHOFAGUS (NOTHOFAGACEAE) SPECIES FROM THE SUBANTARCTIC FOREST UNDER EXPERIMENTAL CONDITIONS OF LIGHT, SUBSTRATE AND ECOLOGICAL INTERACTION
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| Format: | Artículo científico |
| Language: | en |
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Universidade Federal de Lavras
2018
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| author | Alejandro Dezzotti |
| author_facet | Alejandro Dezzotti |
| contents | EARLY DEVELOPMENT OF NOTHOFAGUS (NOTHOFAGACEAE) SPECIES FROM THE SUBANTARCTIC FOREST UNDER EXPERIMENTAL CONDITIONS OF LIGHT, SUBSTRATE AND ECOLOGICAL INTERACTION Alejandro Dezzotti Oscar Ponce Agrociencias Chusquea culeou Nothofagus alpina Nothofagus dombeyi Nothofagus obliqua Randomized factorial experimente The entry of trees into a community is an irregular process often constrained by species interactions and regeneration niche. We experimentally examined the effect of light intensity (high, medium and low), substrate type (mineral and cover with litter) and presence of Chusquea culeou (Poaceae), on the performance of regeneration of Nothofagus dombeyi, N. obliqua and N. alpina (Nothofagaceae). These species constitute the natural forest within the lake Lácar watershed (40° 08´ W, 71° 30´ S). Populations of C. culeou, an abundant understorey component that restrict tree regeneration, experimented in 2001 a gregarious fl owering and subsequent mortality comprising 200,000 ha and the development of an abundant seedlings cohort. During tests, Nothofagus species exhibited a very low germination (< 2.2%) positively correlated with seed weight. Plant emergence and size was larger and mortality smaller under high irradiation, probably as an adaptation to colonize open areas. Reduced germination of seeds on organic substrate was ascribed to the role of litter as a physical barrier. Nothofagus exhibited 76% of increased mortality under the presence of C. culeou, whose germination was very abundant (93% in laboratory) and occurred preferably with high irradiance and litter. However, C. culeou also showed a good response with lower light levels. After senescence, C. culeou would form an abundant and fast-growing cohort that probably limits Nothofagus ability to establish, given increased mortality and litter accumulation. These results contribute to a better understanding of succession, which is crucial for implementing a sound management of this valuable ecosystem. 2018 artículo científico 0104-7760 https://www.redalyc.org/articulo.oa?id=74460166009 https://www.redalyc.org/journal/744/74460166009/ https://www.redalyc.org/journal/744/74460166009/html/ https://www.redalyc.org/journal/744/74460166009/74460166009.epub https://www.redalyc.org/journal/744/74460166009/movil 10.1590/01047760201824012507 en http://www.redalyc.org/revista.oa?id=744 CERNE application/pdf Universidade Federal de Lavras CERNE (Brasil) Num.2 Vol.24 |
| format | Artículo científico |
| id | redalyc_74460166009 |
| institution | Redalyc |
| language | en |
| publishDate | 2018 |
| publisher | Universidade Federal de Lavras |
| spellingShingle | EARLY DEVELOPMENT OF NOTHOFAGUS (NOTHOFAGACEAE) SPECIES FROM THE SUBANTARCTIC FOREST UNDER EXPERIMENTAL CONDITIONS OF LIGHT, SUBSTRATE AND ECOLOGICAL INTERACTION Alejandro Dezzotti Agrociencias Chusquea culeou Nothofagus alpina Nothofagus dombeyi Nothofagus obliqua Randomized factorial experimente EARLY DEVELOPMENT OF NOTHOFAGUS (NOTHOFAGACEAE) SPECIES FROM THE SUBANTARCTIC FOREST UNDER EXPERIMENTAL CONDITIONS OF LIGHT, SUBSTRATE AND ECOLOGICAL INTERACTION Alejandro Dezzotti Oscar Ponce Agrociencias Chusquea culeou Nothofagus alpina Nothofagus dombeyi Nothofagus obliqua Randomized factorial experimente The entry of trees into a community is an irregular process often constrained by species interactions and regeneration niche. We experimentally examined the effect of light intensity (high, medium and low), substrate type (mineral and cover with litter) and presence of Chusquea culeou (Poaceae), on the performance of regeneration of Nothofagus dombeyi, N. obliqua and N. alpina (Nothofagaceae). These species constitute the natural forest within the lake Lácar watershed (40° 08´ W, 71° 30´ S). Populations of C. culeou, an abundant understorey component that restrict tree regeneration, experimented in 2001 a gregarious fl owering and subsequent mortality comprising 200,000 ha and the development of an abundant seedlings cohort. During tests, Nothofagus species exhibited a very low germination (< 2.2%) positively correlated with seed weight. Plant emergence and size was larger and mortality smaller under high irradiation, probably as an adaptation to colonize open areas. Reduced germination of seeds on organic substrate was ascribed to the role of litter as a physical barrier. Nothofagus exhibited 76% of increased mortality under the presence of C. culeou, whose germination was very abundant (93% in laboratory) and occurred preferably with high irradiance and litter. However, C. culeou also showed a good response with lower light levels. After senescence, C. culeou would form an abundant and fast-growing cohort that probably limits Nothofagus ability to establish, given increased mortality and litter accumulation. These results contribute to a better understanding of succession, which is crucial for implementing a sound management of this valuable ecosystem. 2018 artículo científico 0104-7760 https://www.redalyc.org/articulo.oa?id=74460166009 https://www.redalyc.org/journal/744/74460166009/ https://www.redalyc.org/journal/744/74460166009/html/ https://www.redalyc.org/journal/744/74460166009/74460166009.epub https://www.redalyc.org/journal/744/74460166009/movil 10.1590/01047760201824012507 en http://www.redalyc.org/revista.oa?id=744 CERNE application/pdf Universidade Federal de Lavras CERNE (Brasil) Num.2 Vol.24 |
| title | EARLY DEVELOPMENT OF NOTHOFAGUS (NOTHOFAGACEAE) SPECIES FROM THE SUBANTARCTIC FOREST UNDER EXPERIMENTAL CONDITIONS OF LIGHT, SUBSTRATE AND ECOLOGICAL INTERACTION |
| topic | Agrociencias Chusquea culeou Nothofagus alpina Nothofagus dombeyi Nothofagus obliqua Randomized factorial experimente |
| url | https://www.redalyc.org/articulo.oa?id=74460166009 https://www.redalyc.org/journal/744/74460166009/ https://www.redalyc.org/journal/744/74460166009/html/ https://www.redalyc.org/journal/744/74460166009/74460166009.epub https://www.redalyc.org/journal/744/74460166009/movil |