Estudos sobre a vegetação das Campinas Amazônicas - I Introdução a uma série de publicações sobre a vegetação das Campinas Amazônicas

Prance, Ghillean Τ.

doi:10.1590/1809-43921975053207

Cited by 15 publications

(9 citation statements)

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“…In general, Amazonian sandy and oligotrophic environments are associated with low‐stature forests and low diversity vegetation (Prance ; Anderson ; Coomes ; Vicentini ; Stropp et al. ).…”

Section: Discussionmentioning

confidence: 99%

Disentangling the role of edaphic variability, flooding regime and topography of Amazonian white‐sand vegetation

Damasco

Vicentini

Castilho

et al. 2012

J Vegetation Science

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Question How much variation in plant community structure and composition can be predicted using soil, flooding and topography in white‐sand vegetation of northern Amazonia? Location Brazil, northern Amazon, Roraima State, Viruá National Park (01°46′34″ N, 61°02′06″ W). Methods Data from 17, 1‐ha permanent plots distributed across a 25 km2 landscape within the Viruá National Park, northern Amazonia, was used to assess the soil, flooding and topography effects on tree species composition, diversity and structure. Our analyses were based on 16 599 trees (DBH ≥ 1 cm) belonging to 303 species. Principal components analysis (PCA) was used to reduce the dimensionality of soil variables, whereas dimensionality of floristic composition assemblage was reduced using non‐metric multidimensional scaling (NMDS). Multiple regression analysis was used to test combined effects of soil, flooding and topography on floristic composition, diversity, basal area and tree density. Results Depending on the diameter class or the type of data (qualitative or quantitative), NMDS axis 1 explained 45–84% of total variation in species composition among plots. The first and second axes from PCA explained, respectively, 54.8% and 15.1% of the variation related to soil gradients. Soil texture and fertility (PCA axis 1) were the most important predictors of the variation in tree composition, diversity and structure for the three different size classes analysed (DBH ≥ 1 cm, 1 cm ≤ DBH ≤ 9.9 cm and DBH ≥ 10 cm). Overall, plots on more fertile clayey soils showed higher tree diversity and basal area than those on well‐drained sandy soils. Although flooding had little effect on the tree community, the water level was higher in high‐stature forests established on more clayey and fertile soils. Conclusions Even though soils in the study area are predominantly sandy and oligotrophic, our findings highlight the importance of soil in structuring plant communities of seasonally flooded white‐sand vegetation at mesoscales in the Amazon Basin.

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“…In general, Amazonian sandy and oligotrophic environments are associated with low‐stature forests and low diversity vegetation (Prance ; Anderson ; Coomes ; Vicentini ; Stropp et al. ).…”

Section: Discussionmentioning

confidence: 99%

Disentangling the role of edaphic variability, flooding regime and topography of Amazonian white‐sand vegetation

Damasco

Vicentini

Castilho

et al. 2012

J Vegetation Science

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“…The distribution of these forest types is closely associated with soil type, as upland terra firme forest occurs on Oxisols and Ultisols of the plateau surfaces and valley slopes, riverine forest occurs on hydromorphic Oxisols of the valley bottoms, and campina and campinarana forests occur on the dispersed Spodosols. Each forest type is compositionally, structurally, and functionally distinct from the others, but together they may be classified as "forest on terra firme" to distinguish them from the inundation forests (vfirzea and igap6) of the active floodplains [Prance, 1978].…”

Section: Regional Settingmentioning

confidence: 99%

“…Other soil environmental factors such as elevated temperatures and low moisture storage capacity also require special adaptations [Lisb•a, 1975]. Consequently, the species diversity of campina forest is less than that of other forests of the central Amazon [Prance, 1975]. The most common tree species is Glycoxylon inophyllum, but it, as well as the more than 40 other tree species identified, is irregularly distributed [Anderson et al, 1975].…”

Section: Campina Forest Is Low (<10 M) and Open With Vegetation Concmentioning

confidence: 99%

Dissolved organic matter and terrestrial‐lotic linkages in the Central Amazon Basin of Brazil

McClain¹,

Richey²,

Brandes³

et al. 1997

Global Biogeochemical Cycles

105

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Abstract. We evaluate the hypothesis that decomposition and adsorption reactions operating in upland soils of headwater catchments control the concentration and composition of dissolved and fine particulate organic matter in rivers of the Amazon basin. In two contrasting first-order catchments characteristic of the central Amazon basin, we analyzed plant, litter, soil, groundwater, and stream water chemistry. Our results indicate that clear and persistent differences exist in the concentration and elemental composition of dissolved organic matter (DOM) in stream waters and groundwaters from the two catchments, due mainly to corresponding differences in soil texture and chemistry. Within the more oxide and clay rich Oxisols underlying terra firme forest, groundwater DOM concentrations were uniformly low (120 gMC) and C/N ratios averaged 10. Conversely, within the oxide and clay deficient Spodosols underlying campinarana forest, groundwater DOM concentrations were greatly elevated (3000 gMC), and C/N ratios averaged near 60. We found that, in the terra firme/Oxisol terrain, the majority of DOM contributions to the stream derived from the riparian zone, while in the campinarana/Spodosol terrain, upland groundwater contributions could account for the concentration and composition of DOM in the stream. The implications of our findings are that in the terra firme terrains which dominate the region, upland soil profiles are not the site of definitive processes which impart compositional signatures to organic matter carried by the largest rivers of the Amazon basin, as was hypothesized. Instead, we suggest that definitive reactions are focused primarily in the river corridor.

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“…O termo "campina" na região amazônica ainda é muito discutido, mas refere-se, em geral, a uma paisagem caracterizada por vegetação de porte baixo (3-4m), aberta e escleromórfica, que ocorre sempre em solos arenosos de baixa fertilidade, principalmente em áreas de influência da bacia do Rio Negro (Takeuchi, 1960;Sioli, 1960;Rodrigues, 1961, Prance, 1975, Eiten, 1992Ferreira, 1997). São ambientes que, devido as naturais condições edafológicas, passam por um déficit hídrico extremo nos períodos sem chuva, facilitando a propagação de fogos antropogênicos pelo acúmulo de biomassa seca sobre o solo.…”

Section: Introductionunclassified

Biomassa acima do solo de um ecossistema de "campina" em Roraima, norte da Amazônia brasileira

Barbosa

Ferreira

2004

Acta Amaz.

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RESUMOFoi estimada a biomassa (viva + morta) acima do solo de um ecossistema de "campina" localizado em Roraima, norte da Amazônia brasileira. A biomassa foi determinada a partir de um inventário fitossociológico (1 ha amostral) e distribuída em dois estratos: (1) gramíneo-lenhoso, composto de "ervas + liquens" (Poaceae, Cyperaceae, Eriocaulaceae, Cladonia spp), Bromeliaceae, plântulas, "litter" fino e grosso e, (2) arbóreo-arbustivo, composto por árvores e arbustos. O estrato gramíneo-lenhoso foi estimado pelo método direto (corte e pesagem) através de 10 quadras de 1m 2 , aproveitando os transectos do inventário. O estrato arbóreo-arbustivo foi estimado pelo método indireto com o corte de 98 indivíduos de diferentes espécies e diâmetros. Foi gerado um modelo para expressar a relação entre a biomassa seca total (kg), a circunferência de base (cm) e a altura total (m) para os indivíduos deste estrato. A equação foi aplicada nos 3.966 indivíduos.ha ). Estes resultados são importantes para refinar os cálculos de emissão de gases do efeito estufa pela queima e decomposição da biomassa acima do solo em ecossistemas de campinas na Amazônia. PALAVRAS-CHAVE

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Estudos sobre a vegetação das Campinas Amazônicas - I Introdução a uma série de publicações sobre a vegetação das Campinas Amazônicas

Abstract: Resumo Com este trabalho é iniciada uma série de publicações sobre a vegetação das campinas amazônicas de regossois (areia branca). Constitui uma introdução aos primeiros 3 (três) trabalhos da série, e um resumo dos assuntos em estudo no momento.

Cited by 15 publications

References 0 publications

Disentangling the role of edaphic variability, flooding regime and topography of Amazonian white‐sand vegetation

Disentangling the role of edaphic variability, flooding regime and topography of Amazonian white‐sand vegetation

Dissolved organic matter and terrestrial‐lotic linkages in the Central Amazon Basin of Brazil

Biomassa acima do solo de um ecossistema de "campina" em Roraima, norte da Amazônia brasileira

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