Repeated fires trap Amazonian blackwater floodplains in an open vegetation state
Climate change may increase the occurrence of droughts and fires in the Amazon. Most of our understanding on how fire affects tropical ecosystems is based on studies of non-flooded forest–savanna ecotones. Nonetheless, tropical floodplain forests in the Amazon can burn severely during extreme drough...
| Autor principal: | Flores, Bernardo Monteiro |
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| Outros Autores: | Fagoaga, Raquel, Nelson, Bruce Walker, Holmgren, Milena |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Journal of Applied Ecology
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/17258 |
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oai:repositorio:1-17258 |
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oai:repositorio:1-17258 Repeated fires trap Amazonian blackwater floodplains in an open vegetation state Flores, Bernardo Monteiro Fagoaga, Raquel Nelson, Bruce Walker Holmgren, Milena Abundance Basal Area Biological Invasion Ecosystem Dynamics Ecosystem Resilience El Nino-southern Oscillation Field Survey Fire History Floodplain Forest Forest Fires Herb Landsat Regeneration Seed Bank Species Diversity Species Richness Stand Structure Succession Tropical Forest Wetland Amazonia Climate change may increase the occurrence of droughts and fires in the Amazon. Most of our understanding on how fire affects tropical ecosystems is based on studies of non-flooded forest–savanna ecotones. Nonetheless, tropical floodplain forests in the Amazon can burn severely during extreme droughts. The mechanisms slowing down forest regeneration in these ecosystems remain poorly understood and have never been assessed in the field. We studied the recovery of Amazonian blackwater floodplain forests after one and two fire events. We used Landsat images to map fire history and conducted field surveys to measure forest structure, tree species richness, tree seed bank and post-fire invasion of herbaceous plants. Sites burnt once had on average 0% trees, 6% tree seed abundance, 23% tree seed species richness and 8% root mat thickness compared to unburnt forests. In contrast, herbaceous cover increased from 0 to 72%. Nonetheless, forest structure and diversity recovered slowly towards pre-burn levels, except for tree seed banks that remained depleted even 15 years after fire. Sites burnt twice had on average 0% trees, 1% tree seed abundance, 3% tree seed species richness and 1% root mat thickness compared to unburnt forests. Herbaceous cover increased to 100%. Mean recovery of tree basal area was 50% slower and of root mat thickness 93% slower compared to recovery in sites burnt once. Tree seed banks did not recover at all, and herbaceous cover persisted close to 100% for more than 20 years after the second fire. Synthesis and applications. Our results indicate that after a second fire event, Amazonian blackwater floodplain forests lose their recovery capacity, and persist in a non-forested state dominated by herbaceous vegetation. Such fragility implies that preventing human ignited fires during drought episodes is a particularly important conservation strategy for these ecosystems. © 2016 The Authors. Journal of Applied Ecology © 2016 British Ecological Society 2020-06-15T21:40:32Z 2020-06-15T21:40:32Z 2016 Artigo https://repositorio.inpa.gov.br/handle/1/17258 10.1111/1365-2664.12687 en Volume 53, Número 5, Pags. 1597-1603 Restrito Journal of Applied Ecology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Abundance Basal Area Biological Invasion Ecosystem Dynamics Ecosystem Resilience El Nino-southern Oscillation Field Survey Fire History Floodplain Forest Forest Fires Herb Landsat Regeneration Seed Bank Species Diversity Species Richness Stand Structure Succession Tropical Forest Wetland Amazonia |
| spellingShingle |
Abundance Basal Area Biological Invasion Ecosystem Dynamics Ecosystem Resilience El Nino-southern Oscillation Field Survey Fire History Floodplain Forest Forest Fires Herb Landsat Regeneration Seed Bank Species Diversity Species Richness Stand Structure Succession Tropical Forest Wetland Amazonia Flores, Bernardo Monteiro Repeated fires trap Amazonian blackwater floodplains in an open vegetation state |
| topic_facet |
Abundance Basal Area Biological Invasion Ecosystem Dynamics Ecosystem Resilience El Nino-southern Oscillation Field Survey Fire History Floodplain Forest Forest Fires Herb Landsat Regeneration Seed Bank Species Diversity Species Richness Stand Structure Succession Tropical Forest Wetland Amazonia |
| description |
Climate change may increase the occurrence of droughts and fires in the Amazon. Most of our understanding on how fire affects tropical ecosystems is based on studies of non-flooded forest–savanna ecotones. Nonetheless, tropical floodplain forests in the Amazon can burn severely during extreme droughts. The mechanisms slowing down forest regeneration in these ecosystems remain poorly understood and have never been assessed in the field. We studied the recovery of Amazonian blackwater floodplain forests after one and two fire events. We used Landsat images to map fire history and conducted field surveys to measure forest structure, tree species richness, tree seed bank and post-fire invasion of herbaceous plants. Sites burnt once had on average 0% trees, 6% tree seed abundance, 23% tree seed species richness and 8% root mat thickness compared to unburnt forests. In contrast, herbaceous cover increased from 0 to 72%. Nonetheless, forest structure and diversity recovered slowly towards pre-burn levels, except for tree seed banks that remained depleted even 15 years after fire. Sites burnt twice had on average 0% trees, 1% tree seed abundance, 3% tree seed species richness and 1% root mat thickness compared to unburnt forests. Herbaceous cover increased to 100%. Mean recovery of tree basal area was 50% slower and of root mat thickness 93% slower compared to recovery in sites burnt once. Tree seed banks did not recover at all, and herbaceous cover persisted close to 100% for more than 20 years after the second fire. Synthesis and applications. Our results indicate that after a second fire event, Amazonian blackwater floodplain forests lose their recovery capacity, and persist in a non-forested state dominated by herbaceous vegetation. Such fragility implies that preventing human ignited fires during drought episodes is a particularly important conservation strategy for these ecosystems. © 2016 The Authors. Journal of Applied Ecology © 2016 British Ecological Society |
| format |
Artigo |
| author |
Flores, Bernardo Monteiro |
| author2 |
Fagoaga, Raquel Nelson, Bruce Walker Holmgren, Milena |
| author2Str |
Fagoaga, Raquel Nelson, Bruce Walker Holmgren, Milena |
| title |
Repeated fires trap Amazonian blackwater floodplains in an open vegetation state |
| title_short |
Repeated fires trap Amazonian blackwater floodplains in an open vegetation state |
| title_full |
Repeated fires trap Amazonian blackwater floodplains in an open vegetation state |
| title_fullStr |
Repeated fires trap Amazonian blackwater floodplains in an open vegetation state |
| title_full_unstemmed |
Repeated fires trap Amazonian blackwater floodplains in an open vegetation state |
| title_sort |
repeated fires trap amazonian blackwater floodplains in an open vegetation state |
| publisher |
Journal of Applied Ecology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/17258 |
| _version_ |
1787141483652972544 |
| score |
11.755432 |