Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region
ABSTRACTThe environmental changes and the dynamics of the savanna-forest mosaic, over the last 1050 years, have been reconstructed by pollen, charcoal, radiocarbon dating mineralogical and geochemical analyses of sediment cores taken from three different Mauritia flexuosapalm swamps in the northernm...
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| Format: | Article |
| Language: | English |
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Academia Brasileira de Ciências
2015-09-01
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| Series: | Anais da Academia Brasileira de Ciências |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401623&lng=en&tlng=en |
| _version_ | 1818290717728964608 |
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| author | MARIA ECILENE N.S. MENESES MARCONDES L. COSTA DIRK ENTERS HERMANN BEHLING |
| author_facet | MARIA ECILENE N.S. MENESES MARCONDES L. COSTA DIRK ENTERS HERMANN BEHLING |
| author_sort | MARIA ECILENE N.S. MENESES |
| collection | DOAJ |
| description | ABSTRACTThe environmental changes and the dynamics of the savanna-forest mosaic, over the last 1050 years, have been reconstructed by pollen, charcoal, radiocarbon dating mineralogical and geochemical analyses of sediment cores taken from three different Mauritia flexuosapalm swamps in the northernmost part of the Brazilian Amazon region (northern state of Roraima). Studies on the relationship between the modern pollen rain and the regional vegetation provide additional information for the interpretation of the fossil pollen records. The fossil pollen assemblages and geochemical results indicate relatively wet climatic conditions throughout the recorded period. Despite these moist conditions, fires were frequent and are one of the reasons for the dominance of a grassy savanna instead of forest expansion in the study area. Considering the generally wet climatic conditions, these fires were most likely caused by human activities. Even today, fires hinder forest expansion into savanna areas. Sandy hydromorphic soils may also act as an edaphic control to maintain the current sharp boundary between forest and savanna ecosystems. |
| first_indexed | 2024-12-13T02:32:37Z |
| format | Article |
| id | doaj.art-5d2676f1fe984c18a42c2c623c22feae |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-12-13T02:32:37Z |
| publishDate | 2015-09-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-5d2676f1fe984c18a42c2c623c22feae2022-12-22T00:02:28ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902015-09-018731623165110.1590/0001-3765201520130074S0001-37652015000401623Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon regionMARIA ECILENE N.S. MENESESMARCONDES L. COSTADIRK ENTERSHERMANN BEHLINGABSTRACTThe environmental changes and the dynamics of the savanna-forest mosaic, over the last 1050 years, have been reconstructed by pollen, charcoal, radiocarbon dating mineralogical and geochemical analyses of sediment cores taken from three different Mauritia flexuosapalm swamps in the northernmost part of the Brazilian Amazon region (northern state of Roraima). Studies on the relationship between the modern pollen rain and the regional vegetation provide additional information for the interpretation of the fossil pollen records. The fossil pollen assemblages and geochemical results indicate relatively wet climatic conditions throughout the recorded period. Despite these moist conditions, fires were frequent and are one of the reasons for the dominance of a grassy savanna instead of forest expansion in the study area. Considering the generally wet climatic conditions, these fires were most likely caused by human activities. Even today, fires hinder forest expansion into savanna areas. Sandy hydromorphic soils may also act as an edaphic control to maintain the current sharp boundary between forest and savanna ecosystems.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401623&lng=en&tlng=enfrequência do fogoHoloceno tardioRoraima-Brasildinâmica da vegetação |
| spellingShingle | MARIA ECILENE N.S. MENESES MARCONDES L. COSTA DIRK ENTERS HERMANN BEHLING Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region Anais da Academia Brasileira de Ciências frequência do fogo Holoceno tardio Roraima-Brasil dinâmica da vegetação |
| title | Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region |
| title_full | Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region |
| title_fullStr | Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region |
| title_full_unstemmed | Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region |
| title_short | Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region |
| title_sort | environmental changes during the last millennium based on multi proxy palaeoecological records in a savanna forest mosaic from the northernmost brazilian amazon region |
| topic | frequência do fogo Holoceno tardio Roraima-Brasil dinâmica da vegetação |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401623&lng=en&tlng=en |
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