Composição florística e chave de identificação das Poaceae ocorrentes nas savanas costeiras amazônicas, Brasil

Rocha, Antônio Elielson Sousa da; Miranda, Izildinha Souza; Neto, Salustiano Vilar da Costa

doi:10.1590/1809-4392201305173

Cited by 10 publications

(7 citation statements)

References 13 publications

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“…This event was also observed on the right bank of the Araguaia River, where the vegetation formations of the Cerrado biome predominate. These results are corroborated by the findings of [30], in research conducted in the Marajo Archipelago, and in the state of Amapa. In addition, it should also be noted that there has been a regeneration of peasant vegetation and savannas, especially the latter, which obtained an amount Journal of Geographic Information System greater than 19.5 thousand ha of vegetation regeneration, while the areas of peasant vegetation registered a regeneration just above 366 ha.…”

Section: Evaluation Of the Behavior Of Ate Amazon-cerrado In The Aragsupporting

confidence: 84%

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Multitemporal Analysis of Land Use and Coverage in the Low Course of the Araguaia River

Oliveira¹,

Souza²,

Lima³

2020

JGIS

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This work aimed to analyze the spatial behavior of plant formations and land use in the Ecological Tension Area Amazon-Cerrado. To this end, the Araguaia river basin was selected, in its low course, because it constitutes a physical-natural limit between the two Biomms, with intense dynamics of use and land cover Thus, in addition to researching scientific references and socioeconomic data from secondary sources, a geographic database was elaborated, with georeferenced data, and spatial operations are carried out. Among them, a supervised classification of land use and coverage, with multi-temporal analysis between the years 1984, 2000 and 2018. Thus, an expansion of 4.2 ha of Forest (Amazon biome) was observed on the savanic phytophysiognomy (Cerrado). However, the suppression of forested areas reached values around 21,700 km 2 , with direct conversions to anthropic activities, mainly pasture, about 71%. The results of the mapping compared with the data of the agricultural census show that the landscape of the Araguaia river basin, in its low course, is dominated by areas of pasture managed. However, public policies and government investments have fomented the expansion of agriculture in the direct bank of the river Araguaia, from 2000 onwards, and that the landscape of the left bank is dominated by pasture managed. Finally, it was found that the implantation of protective areas contributed to the vegetational regeneration of both biomms.

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Section: Evaluation Of the Behavior Of Ate Amazon-cerrado In The Aragsupporting

confidence: 84%

“…With approximately 11,114.35 km of extension, it covers the states of Rondonia, Mato Grosso, Para, and Maranhao(Figure 3). It is an Area of Ecological Tension-ATE[29], with variable limits, too complex to be defined, mainly due to the recesses and interprenetrations between the two vegetational formations[30].…”

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confidence: 99%

Multitemporal Analysis of Land Use and Coverage in the Low Course of the Araguaia River

Oliveira¹,

Souza²,

Lima³

2020

JGIS

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“…To date, at least 378 plant species, 350 species of invertebrates, 200 bird species, 108 mammals (including 38 bat species), 26 species of fish, 41 amphibian species and 26 reptile species have been reported in the Cerrado of Amapá (Aguiar and Naiff 2010;Avila-Pires 1995;Azevedo 1967;Barbosa and Souto 2011;Boss 2009;Boss and Silva Rocha et al 2014;Saraiva et al 2011;Schunck et al 2011;Silva et al 2013;Silva et al 1997;Silva et al 2006;Silveira 2003;. Of the plant species reported, two are endemic to the state of Amapá -the carpet grass Axonopus amapaensis G. A.…”

Section: Biodiversitymentioning

confidence: 99%

“…Of the plant species reported, two are endemic to the state of Amapá -the carpet grass Axonopus amapaensis G. A. Black and the herb Borreria amapaensis E. L. Cabral & Bacigalupo (Jardim Botânico do Rio de Janeiro 2016; Rocha et al 2014). Furthermore, the species' Appendicularia thymifolia (Bompl.)…”

Section: Biodiversitymentioning

confidence: 99%

Biodiversity, threats and conservation challenges in the Cerrado of Amapá, an Amazonian savanna

Mustin¹,

Carvalho²,

Hilário³

et al. 2017

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An Amazonian savanna in northern Brazil known as the Cerrado of Amapá is under imminent threat from poor land-use planning, the expansion of large-scale agriculture and other anthropogenic pressures. These savannas house a rich and unique flora and fauna, including endemic plants and animals. However, the area remains under-sampled for most taxa, and better sampling may uncover new species. We estimate that only ~9.16% of these habitats have any kind of protection, and legislative changes threaten to further weaken or remove this protection. Here we present the status of knowledge concerning the biodiversity of the Cerrado of Amapá, its conservation status, and the main threats to the conservation of this Amazonian savanna. To secure the future of these unique and imperilled habitats, we suggest urgent expansion of protected areas, as well as measures that would promote less-damaging land uses to support the local population.

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“…Algumas áreas de savanas do Nordeste Paraense e da ilha do Marajó tem sofrido anualmente com as queimadas frequentes, a retirada de madeira, a devastação de terras para plantio comerciais, a extração mineral com a ocupação para loteamento e descarte de lixo residencial estão entre os principais impactos negativos que as savanas costeiras amazônicas vêm sofrendo (Rocha et al, 2014;Ferreira et al, 2020). Essas ações ocorrem nessas áreas, sobretudo pela falta de conhecimento e valoração das savanas.…”

Section: Introductionunclassified

Florística e estrutura do estrato arbóreo em cinco savanas no estado do Pará, Brasil

Coutinho

Neto

Jardim

2021

Rev. Bras. Geog. Fis.

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As savanas amazônicas formam ecossistemas ambientalmente degradados e subestimados, sobretudo no que se refere à dinâmica da vegetação e aos processos ecológicos ocorrentes. Com o objetivo de determinar a composição florística e a estrutura de comunidades vegetais em fragmentos de Cerrado disjunto, este trabalho foi desenvolvido em cinco áreas oreádicas costeiras, localizadas no Nordeste Paraense e Ilha do Marajó, PA. Os dados foram coletados seguindo o protocolo de Avaliação Fitossociológica Mínima em paisagens com maior nível de conservação, incluindo exemplares lenhosos vivos, com diâmetro do caule ao nível do solo (DCNS3cm) ≥ 3 cm e adotando-se a distribuição em classes de altura estratificadas em CI (≤ 4,19 m), CII (4,2-7,56 m) e CIII (≥ 7,57 m) e; em classes de diâmetro em CI (3-7 cm), CII (7,1-12 cm), CIII (12,1-17 cm), CIV (17,1-22 cm) e CV (≥ 22,1 cm). Em cinco ha de savanas foram registrados 3.984 indivíduos, distribuídos em 33 famílias, 54 gêneros e 69 espécies. Fabaceae (8), Myrtaceae (6) e Malpighiaceae (5) destacaram-se com maior riqueza e Malpighiaceae em abundância. Byrsonima crassifolia (1.413), Curatella americana (660) e Myrcia cuprea (544) obtiverm maior número de indivíduos e valor de importância em todas as áreas, acompanhadas por Himatanthus articulatus e Hancornia speciosa. A classe CI de altura e de diâmetro agrupou o maior número de indivíduos e a maior diversidade e grau de similaridade florística entre as classes CI e CII. A hiperdominância de indivíduos das espécies de maior participação na estrutura vertical, típicas das savanas amazônicas, indica uma adequação a ambientes com condições distróficas, em solos arenosos ácidos e com baixo conteúdo de nutrientes e; assegura afirmar que estas áreas de savanas são jovens, ainda em fase de desenvolvimento. Floristic and structure of the woody species in five savannas in the state of Pará, BrazilA B S T R A C T Amazonian savannas form environmentally degraded and underestimated ecosystems, especially with regard to the dynamics of vegetation and the ecological processes that occur. With the objective of determining the floristic composition and the structure of plant communities in fragments of disjointed Cerrado, this work was developed in five coastal oreadic areas, located in the Northeast of Pará and Ilha do Marajó, PA. Data collections were performed following the Minimum Phytosociological Assessment protocol in landscapes with a higher level of conservation, including live woody specimens, with stem diameter at ground level (DCNS3cm) ≥ 3 cm and adopting stratified height classes: CI (≤ 4.19 m), CII (4.2-7.56 m) and CIII (≥ 7.57 m) and diameter classes in CI (3-7 cm), CII (7.1-12 cm), CIII (12.1-17 cm), CIV (17.1-22 cm) and CV (≥ 22.1 cm). In five ha of savannas 3,984 individuals were registered, distributed in 33 families, 54 genera and 69 species. Fabaceae (8), Myrtaceae (6) and Malpighiaceae (5) stood out with greater wealth and Malpighiaceae in abundance. Byrsonima crassifolia (1413), Curatella americana (660) and Myrcia cuprea (544) stood out in number of individuals and importance value in all areas, accompanied by Himatanthus articulatus and Hancornia speciosa. The data showed that the CI class of height and diameter grouped the largest number of individuals and the largest number of individuals, diversity and degree of floristic similarity between classes CI and CII. The hyper-dominance of individuals of the species with greater participation in the vertical structure, typical of the Amazonian savannas, indicates an adaptation to environments with dystrophic conditions, in acidic sandy soils and with low nutrient content and; ensures that these savanna areas are young, still under development.Keywords: Phytosociology; structural classes; typical species.

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Composição florística e chave de identificação das Poaceae ocorrentes nas savanas costeiras amazônicas, Brasil

Cited by 10 publications

References 13 publications

Multitemporal Analysis of Land Use and Coverage in the Low Course of the Araguaia River

Multitemporal Analysis of Land Use and Coverage in the Low Course of the Araguaia River

Biodiversity, threats and conservation challenges in the Cerrado of Amapá, an Amazonian savanna

Florística e estrutura do estrato arbóreo em cinco savanas no estado do Pará, Brasil

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