Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina)
Arbuscular mycorrhizae (AM) can ameliorate the impact of disturbance on agroecosystem sustainability. The objective of this study was to describe mycorrhizal colonization patterns in contrasting grazing situations (exclosure and continuous grazing) and topographical positions (upland and lowland) in...
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2004
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0022409X_v57_n6_p601_Grigera http://hdl.handle.net/20.500.12110/paper_0022409X_v57_n6_p601_Grigera |
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paper:paper_0022409X_v57_n6_p601_Grigera2023-06-08T14:50:50Z Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina) Belowground processes Dallis grass Plant community Species interactions Subhumid grassland Vesicular-arbuscular mycorrhizae grassland grazing interspecific interaction topography vesicular-arbuscular mycorrhiza Argentina South America Western Hemisphere World Paspalum dilatatum Arbuscular mycorrhizae (AM) can ameliorate the impact of disturbance on agroecosystem sustainability. The objective of this study was to describe mycorrhizal colonization patterns in contrasting grazing situations (exclosure and continuous grazing) and topographical positions (upland and lowland) in the flooding pampa (Argentina). We determined the mycorrhizal colonization of the community as a whole and of Dallis grass (Paspalum dilatatum Poir.), a highly palatable, dominant species. We characterized colonization by the proportion of root length occupied by fungi and their different structures. At the community level, there was higher total colonization in the grazed area than in the exclosure. In contrast, Dallis grass showed higher total colonization and higher proportion of vesicles and arbuscules in the exclosure than in the grazed area. For both levels, colonization was higher in the lowland than in the upland position. Differences were observed only in winter and spring, not in summer. Our results show that 1) continuous grazing is associated with an increase of mycorrhizal colonization at the community level and 2) community-level patterns of mycorrhizal colonization cannot be inferred from dominant species. To our knowledge, this is the first characterization of AM abundance at the plant community level under contrasting long-term grazing conditions in a subhumid grassland. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0022409X_v57_n6_p601_Grigera http://hdl.handle.net/20.500.12110/paper_0022409X_v57_n6_p601_Grigera |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Belowground processes Dallis grass Plant community Species interactions Subhumid grassland Vesicular-arbuscular mycorrhizae grassland grazing interspecific interaction topography vesicular-arbuscular mycorrhiza Argentina South America Western Hemisphere World Paspalum dilatatum |
| spellingShingle |
Belowground processes Dallis grass Plant community Species interactions Subhumid grassland Vesicular-arbuscular mycorrhizae grassland grazing interspecific interaction topography vesicular-arbuscular mycorrhiza Argentina South America Western Hemisphere World Paspalum dilatatum Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina) |
| topic_facet |
Belowground processes Dallis grass Plant community Species interactions Subhumid grassland Vesicular-arbuscular mycorrhizae grassland grazing interspecific interaction topography vesicular-arbuscular mycorrhiza Argentina South America Western Hemisphere World Paspalum dilatatum |
| description |
Arbuscular mycorrhizae (AM) can ameliorate the impact of disturbance on agroecosystem sustainability. The objective of this study was to describe mycorrhizal colonization patterns in contrasting grazing situations (exclosure and continuous grazing) and topographical positions (upland and lowland) in the flooding pampa (Argentina). We determined the mycorrhizal colonization of the community as a whole and of Dallis grass (Paspalum dilatatum Poir.), a highly palatable, dominant species. We characterized colonization by the proportion of root length occupied by fungi and their different structures. At the community level, there was higher total colonization in the grazed area than in the exclosure. In contrast, Dallis grass showed higher total colonization and higher proportion of vesicles and arbuscules in the exclosure than in the grazed area. For both levels, colonization was higher in the lowland than in the upland position. Differences were observed only in winter and spring, not in summer. Our results show that 1) continuous grazing is associated with an increase of mycorrhizal colonization at the community level and 2) community-level patterns of mycorrhizal colonization cannot be inferred from dominant species. To our knowledge, this is the first characterization of AM abundance at the plant community level under contrasting long-term grazing conditions in a subhumid grassland. |
| title |
Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina) |
| title_short |
Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina) |
| title_full |
Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina) |
| title_fullStr |
Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina) |
| title_full_unstemmed |
Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina) |
| title_sort |
mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (argentina) |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0022409X_v57_n6_p601_Grigera http://hdl.handle.net/20.500.12110/paper_0022409X_v57_n6_p601_Grigera |
| _version_ |
1768543597212205056 |