Life cycle of bamboo in the southwestern Amazon and its relation to fire events
Bamboo-dominated forests comprise 1 % of the world's forests and 3 % of the Amazon forests. The Guadua spp. bamboos that dominate the southwest Amazon are semelparous; thus flowering and fruiting occur once in a lifetime before death. These events occur in massive spatially organized patches every 2...
| Autor principal: | Dalagnol, Ricardo |
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| Outros Autores: | Wagner, Fabien H., Galvão, L. S., Nelson, Bruce Walker, Aragao, L. E.O.C. |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Biogeosciences
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/14892 |
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oai:repositorio:1-14892 |
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dspace |
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oai:repositorio:1-14892 Life cycle of bamboo in the southwestern Amazon and its relation to fire events Dalagnol, Ricardo Wagner, Fabien H. Galvão, L. S. Nelson, Bruce Walker Aragao, L. E.O.C. Accuracy Assessment Bamboo Climate Change Drought Flowering Fruiting Life Cycle Modis Probability Spatial Distribution Temperature Anomaly Time Series Analysis Amazon River Bambusa Guadua Bamboo-dominated forests comprise 1 % of the world's forests and 3 % of the Amazon forests. The Guadua spp. bamboos that dominate the southwest Amazon are semelparous; thus flowering and fruiting occur once in a lifetime before death. These events occur in massive spatially organized patches every 28 years and produce huge quantities of necromass. The bamboo-fire hypothesis argues that increased dry fuel after die-off enhances fire probability, creating opportunities that favor bamboo growth. In this study, our aim is to map the bamboo-dominated forests and test the bamboo-fire hypothesis using satellite imagery. Specifically, we developed and validated a method to map the bamboo die-off and its spatial distribution using satellite-derived reflectance time series from the Moderate Resolution Imaging Spectroradiometer (MODIS) and explored the bamboo-fire hypothesis by evaluating the relationship between bamboo die-off and fires detected by the MODIS thermal anomalies product in the southwest Amazon. Our findings show that the near-infrared (NIR) is the most sensitive spectral interval to characterize bamboo growth and cohort age. Automatic detection of historical bamboo die-off achieved an accuracy above 79 %. We mapped and estimated 15.5 million ha of bamboo-dominated forests in the region. The bamboo-fire hypothesis was not supported because only a small fraction of bamboo areas burned during the analysis timescale, and, in general, bamboo did not show higher fire probability after the die-off. Nonetheless, fire occurrence was 45 % higher in dead than live bamboo in drought years, associated with ignition sources from land use, suggesting a bamboo-human-fire association. Although our findings show that the observed fire was not sufficient to drive bamboo dominance, the increased fire occurrence in dead bamboo in drought years may contribute to the maintenance of bamboo and potential expansion into adjacent bamboo-free forests. Fire can even bring deadly consequences to these adjacent forests under climate change effects. © 2018 Author(s). 2020-05-07T13:47:13Z 2020-05-07T13:47:13Z 2018 Artigo https://repositorio.inpa.gov.br/handle/1/14892 10.5194/bg-15-6087-2018 en Volume 15, Número 20, Pags. 6087-6104 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Biogeosciences |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Accuracy Assessment Bamboo Climate Change Drought Flowering Fruiting Life Cycle Modis Probability Spatial Distribution Temperature Anomaly Time Series Analysis Amazon River Bambusa Guadua |
| spellingShingle |
Accuracy Assessment Bamboo Climate Change Drought Flowering Fruiting Life Cycle Modis Probability Spatial Distribution Temperature Anomaly Time Series Analysis Amazon River Bambusa Guadua Dalagnol, Ricardo Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
| topic_facet |
Accuracy Assessment Bamboo Climate Change Drought Flowering Fruiting Life Cycle Modis Probability Spatial Distribution Temperature Anomaly Time Series Analysis Amazon River Bambusa Guadua |
| description |
Bamboo-dominated forests comprise 1 % of the world's forests and 3 % of the Amazon forests. The Guadua spp. bamboos that dominate the southwest Amazon are semelparous; thus flowering and fruiting occur once in a lifetime before death. These events occur in massive spatially organized patches every 28 years and produce huge quantities of necromass. The bamboo-fire hypothesis argues that increased dry fuel after die-off enhances fire probability, creating opportunities that favor bamboo growth. In this study, our aim is to map the bamboo-dominated forests and test the bamboo-fire hypothesis using satellite imagery. Specifically, we developed and validated a method to map the bamboo die-off and its spatial distribution using satellite-derived reflectance time series from the Moderate Resolution Imaging Spectroradiometer (MODIS) and explored the bamboo-fire hypothesis by evaluating the relationship between bamboo die-off and fires detected by the MODIS thermal anomalies product in the southwest Amazon. Our findings show that the near-infrared (NIR) is the most sensitive spectral interval to characterize bamboo growth and cohort age. Automatic detection of historical bamboo die-off achieved an accuracy above 79 %. We mapped and estimated 15.5 million ha of bamboo-dominated forests in the region. The bamboo-fire hypothesis was not supported because only a small fraction of bamboo areas burned during the analysis timescale, and, in general, bamboo did not show higher fire probability after the die-off. Nonetheless, fire occurrence was 45 % higher in dead than live bamboo in drought years, associated with ignition sources from land use, suggesting a bamboo-human-fire association. Although our findings show that the observed fire was not sufficient to drive bamboo dominance, the increased fire occurrence in dead bamboo in drought years may contribute to the maintenance of bamboo and potential expansion into adjacent bamboo-free forests. Fire can even bring deadly consequences to these adjacent forests under climate change effects. © 2018 Author(s). |
| format |
Artigo |
| author |
Dalagnol, Ricardo |
| author2 |
Wagner, Fabien H. Galvão, L. S. Nelson, Bruce Walker Aragao, L. E.O.C. |
| author2Str |
Wagner, Fabien H. Galvão, L. S. Nelson, Bruce Walker Aragao, L. E.O.C. |
| title |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
| title_short |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
| title_full |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
| title_fullStr |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
| title_full_unstemmed |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
| title_sort |
life cycle of bamboo in the southwestern amazon and its relation to fire events |
| publisher |
Biogeosciences |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/14892 |
| _version_ |
1787142254673002496 |
| score |
11.653393 |