Life cycle of bamboo in the southwestern Amazon and its relation to fire events
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional do INPA |
Texto Completo: | https://repositorio.inpa.gov.br/handle/1/14892 |
Resumo: | 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). |
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Dalagnol, RicardoWagner, Fabien H.Galvão, L. S.Nelson, Bruce WalkerAragao, L. E.O.C.2020-05-07T13:47:13Z2020-05-07T13:47:13Z2018https://repositorio.inpa.gov.br/handle/1/1489210.5194/bg-15-6087-2018Bamboo-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).Volume 15, Número 20, Pags. 6087-6104Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessAccuracy AssessmentBambooClimate ChangeDroughtFloweringFruitingLife CycleModisProbabilitySpatial DistributionTemperature AnomalyTime Series AnalysisAmazon RiverBambusaGuaduaLife cycle of bamboo in the southwestern Amazon and its relation to fire eventsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleBiogeosciencesengreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPAORIGINALartigo-inpa.pdfapplication/pdf3652948https://repositorio.inpa.gov.br/bitstream/1/14892/1/artigo-inpa.pdff5862bc204133481a74826047aec807cMD51CC-LICENSElicense_rdfapplication/octet-stream914https://repositorio.inpa.gov.br/bitstream/1/14892/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD521/148922020-07-14 10:27:59.104oai:repositorio:1/14892Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-07-14T14:27:59Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false |
dc.title.en.fl_str_mv |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
title |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events |
spellingShingle |
Life cycle of bamboo in the southwestern Amazon and its relation to fire events Dalagnol, Ricardo Accuracy Assessment Bamboo Climate Change Drought Flowering Fruiting Life Cycle Modis Probability Spatial Distribution Temperature Anomaly Time Series Analysis Amazon River Bambusa Guadua |
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 |
author |
Dalagnol, Ricardo |
author_facet |
Dalagnol, Ricardo Wagner, Fabien H. Galvão, L. S. Nelson, Bruce Walker Aragao, L. E.O.C. |
author_role |
author |
author2 |
Wagner, Fabien H. Galvão, L. S. Nelson, Bruce Walker Aragao, L. E.O.C. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Dalagnol, Ricardo Wagner, Fabien H. Galvão, L. S. Nelson, Bruce Walker Aragao, L. E.O.C. |
dc.subject.eng.fl_str_mv |
Accuracy Assessment Bamboo Climate Change Drought Flowering Fruiting Life Cycle Modis Probability Spatial Distribution Temperature Anomaly Time Series Analysis Amazon River Bambusa Guadua |
topic |
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). |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018 |
dc.date.accessioned.fl_str_mv |
2020-05-07T13:47:13Z |
dc.date.available.fl_str_mv |
2020-05-07T13:47:13Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://repositorio.inpa.gov.br/handle/1/14892 |
dc.identifier.doi.none.fl_str_mv |
10.5194/bg-15-6087-2018 |
url |
https://repositorio.inpa.gov.br/handle/1/14892 |
identifier_str_mv |
10.5194/bg-15-6087-2018 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Volume 15, Número 20, Pags. 6087-6104 |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Biogeosciences |
publisher.none.fl_str_mv |
Biogeosciences |
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