Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan
Amazonian white-sand vegetation has unique tree communities tolerant to nutrient-poor soils of interest for interpreting processes of adaptation in neotropical forests. Part of this phytophysionomy is confined to Late Quaternary megafan palaeo-landforms, thus we posit that sedimentary disturbance is...
| Autor principal: | Cordeiro, Carlos Leandro de Oliveira |
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| Outros Autores: | Rossetti, Dilce F., Gribel, Rogério, Tuomisto, Hanna, Zani, Hiran, Ferreira, Carlos A.C., Coelho, Luiz S. |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Journal of Tropical Ecology
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/17240 |
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oai:repositorio:1-17240 |
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oai:repositorio:1-17240 Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan Cordeiro, Carlos Leandro de Oliveira Rossetti, Dilce F. Gribel, Rogério Tuomisto, Hanna Zani, Hiran Ferreira, Carlos A.C. Coelho, Luiz S. Adaptation Digital Elevation Model Neotropical Region Remote Sensing Sand Topography Vegetation Dynamics Woodland Amazonia Amazonian white-sand vegetation has unique tree communities tolerant to nutrient-poor soils of interest for interpreting processes of adaptation in neotropical forests. Part of this phytophysionomy is confined to Late Quaternary megafan palaeo-landforms, thus we posit that sedimentary disturbance is the main ecological factor controlling tree distribution and structuring in this environment. In this study, we characterize the topographic trend of one megafan palaeo-landform using a digital elevation model and verify its relationship to the forest by modelling the canopy height with remote sensing data. We also compare the composition and structure (i.e. canopy height and diameter at breast height) of tree groups from the outer and inner megafan environments based on the integration of remote sensing and floristic data. The latter consist of field inventories of trees ≥ 10 cm dbh using six (500 × 20 m) plots in várzea, terra firme and igapó from the outer megafan and 20 (50 × 20 m) plots in woodlands and forests from the inner megafan. The unweighted pair group method with arithmetic mean (UPGMA) and the non-metric multidimensional scaling (NMDS) were applied for clustering and dissimilarity analyses, respectively. The megafan is a sand-dominated triangular wetland with a topographic gradient of < 15 cm km-1, being more elevated along its axis. The outer megafan has a higher number of tree species (367), taller canopy height (mean of 14.1 m) and higher diameter at breast height (mean of 18.2 cm) than the white-sand forest. The latter records 89 tree species, mean canopy height of 8.4 cm and mean diameter at breast height of 15.3 cm. Trees increase in frequency closer to channels and toward the megafan's axis. The flooded and nutrient-poor sandy megafan substrate favoured the establishment of white-sand vegetation according to the overall megafan topography and morphological heterogeneities inherent to megafan sub-environments. © 2016 Cambridge University Press. 2020-06-15T21:40:19Z 2020-06-15T21:40:19Z 2016 Artigo https://repositorio.inpa.gov.br/handle/1/17240 10.1017/S0266467416000493 en Volume 32, Número 6, Pags. 498-509 Restrito Journal of Tropical Ecology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Adaptation Digital Elevation Model Neotropical Region Remote Sensing Sand Topography Vegetation Dynamics Woodland Amazonia |
| spellingShingle |
Adaptation Digital Elevation Model Neotropical Region Remote Sensing Sand Topography Vegetation Dynamics Woodland Amazonia Cordeiro, Carlos Leandro de Oliveira Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan |
| topic_facet |
Adaptation Digital Elevation Model Neotropical Region Remote Sensing Sand Topography Vegetation Dynamics Woodland Amazonia |
| description |
Amazonian white-sand vegetation has unique tree communities tolerant to nutrient-poor soils of interest for interpreting processes of adaptation in neotropical forests. Part of this phytophysionomy is confined to Late Quaternary megafan palaeo-landforms, thus we posit that sedimentary disturbance is the main ecological factor controlling tree distribution and structuring in this environment. In this study, we characterize the topographic trend of one megafan palaeo-landform using a digital elevation model and verify its relationship to the forest by modelling the canopy height with remote sensing data. We also compare the composition and structure (i.e. canopy height and diameter at breast height) of tree groups from the outer and inner megafan environments based on the integration of remote sensing and floristic data. The latter consist of field inventories of trees ≥ 10 cm dbh using six (500 × 20 m) plots in várzea, terra firme and igapó from the outer megafan and 20 (50 × 20 m) plots in woodlands and forests from the inner megafan. The unweighted pair group method with arithmetic mean (UPGMA) and the non-metric multidimensional scaling (NMDS) were applied for clustering and dissimilarity analyses, respectively. The megafan is a sand-dominated triangular wetland with a topographic gradient of < 15 cm km-1, being more elevated along its axis. The outer megafan has a higher number of tree species (367), taller canopy height (mean of 14.1 m) and higher diameter at breast height (mean of 18.2 cm) than the white-sand forest. The latter records 89 tree species, mean canopy height of 8.4 cm and mean diameter at breast height of 15.3 cm. Trees increase in frequency closer to channels and toward the megafan's axis. The flooded and nutrient-poor sandy megafan substrate favoured the establishment of white-sand vegetation according to the overall megafan topography and morphological heterogeneities inherent to megafan sub-environments. © 2016 Cambridge University Press. |
| format |
Artigo |
| author |
Cordeiro, Carlos Leandro de Oliveira |
| author2 |
Rossetti, Dilce F. Gribel, Rogério Tuomisto, Hanna Zani, Hiran Ferreira, Carlos A.C. Coelho, Luiz S. |
| author2Str |
Rossetti, Dilce F. Gribel, Rogério Tuomisto, Hanna Zani, Hiran Ferreira, Carlos A.C. Coelho, Luiz S. |
| title |
Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan |
| title_short |
Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan |
| title_full |
Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan |
| title_fullStr |
Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan |
| title_full_unstemmed |
Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan |
| title_sort |
impact of sedimentary processes on white-sand vegetation in an amazonian megafan |
| publisher |
Journal of Tropical Ecology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/17240 |
| _version_ |
1787142954008182784 |
| score |
11.653393 |