Diferenças florísticas e estruturais entre fitofisionomias do cerrado em Assis, SP, Brasil

Pinheiro, Eduardo da Silva; Durigan, Giselda

doi:10.1590/s0100-67622012000100019

Cited by 45 publications

(39 citation statements)

References 20 publications

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“…In this case, despite the clear distinctions found in the structure and species composition of the three phytophysiognomies surveyed (Pinheiro and Durigan, 2012;Maracahipes-Santos et al, 2015), the causal factors are complex, and appear to depend on the interaction among the different chemical and granulometric properties of the soils, which have distinct effects. This complexity can be perceived in the second ordination axis, which separated the dense cerrado from the other two phytophysiognomies.…”

Section: Discussionmentioning

confidence: 91%

Effects of soil and space on the woody species composition and vegetation structure of three Cerrado phytophysiognomies in the Cerrado-Amazon transition

et al. 2017

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The Cerrado Biome is considered one of the world's biodiversity hotspots because of its rich biodiversity, the high level of endemism and the increasing threat. The Cerrado is composed by a mosaic of different vegetation types, including physiognomies that vary from grasslands (campo limpo) to savannas (typical cerrado or cerrado sensu stricto) and cerrado woodlands (cerradão). However, the factors that determine the composition of the Cerrado's flora and the structure of the physiognomies that compose this biome are still poorly understood. Here, we investigate the influence of the chemical and granulometric properties of the soil and the effect of geographic distance on the occurrence and abundance of woody species in three Cerrado phytophysiognomies -cerrado woodland (cerradão), dense cerrado savanna and typical cerrado savanna -in the Cerrado-Amazon transition. We tested the hypothesis that the edaphic characteristics and geographic space determine the species composition and the structure of the woody vegetation of these three phytophysiognomies. We demonstrate that the dissimilarities in the structure and composition of the three sites were determined more by space (13% of explanation) than edaphic properties (1%), but primarily by the interaction between these two factors (26%). We conclude that, in situations where the chemical and granulometric properties of the soil are relatively homogeneous, as we found in the present study, geographic distance between sites has a greater influence than variation in the substrate's properties on modelling the occurrence and abundance of the woody plant species in the Cerrado.Keywords: cerradão, edaphic properties, geographical distance, soil-vegetation relationship, species composition. Efeito do solo e do espaço sobre a composição de espécies lenhosas e estrutura da vegetação de três fitofisionomias de Cerrado na transição Cerrado-AmazôniaResumo O Bioma Cerrado é considerado um dos "hotspots" mundiais de biodiversidade devido à rica biodiversidade que abriga, ao elevado nível de endemismo e à eminente ameaça. O Cerrado é composto por um mosaico de diferentes tipos de vegetação e inclui fisionomias que variam desde áreas predominantemente graminosas (campo limpo) a savanas (cerrado típico ou cerrado sensu stricto) e florestas (cerradão). Entretanto, os fatores que determinam a composição da flora do Cerrado e a estrutura das fisionomias que o compõem ainda são pouco compreendidas. Aqui, nós avaliamos a influência das propriedades químicas e granulométricas do solo e da distância geográfica sobre a ocorrência e abundância de espécies lenhosas em três fitofisionomias do Cerrado -cerradão (CO), cerrado denso (DC) e cerrado típico (TC) -na transição Cerrado-Amazônia. Nós testamos a hipótese de que as características edáficas e o espaço determinam a composição florística e a estrutura da vegetação lenhosa das três fitofisionomias. Nós demostramos que a dissimilaridade florístico-estrutural entre os três sítios foi mais determinada pelo espaço (13% da explicação) d...

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Section: Discussionmentioning

confidence: 91%

Effects of soil and space on the woody species composition and vegetation structure of three Cerrado phytophysiognomies in the Cerrado-Amazon transition

et al. 2017

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“…The larger trees kept growing, accumulating carbon and probably increasing the roughness of the canopy surface, which leads to increase in rain interception [58]. Eventually, the community structure instead resembles a tropical [30,33,54]. In the long term, due to competition, the community will probably be composed of even larger trees at lower densities.…”

Section: (A) Woody Encroachmentmentioning

confidence: 99%

Woody encroachment and its consequences on hydrological processes in the savannah

Honda

Durigan

2016

Phil. Trans. R. Soc. B

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Woody encroachment due to changes in climate or in the disturbance regimes (fire and herbivory) has been observed throughout the savannah biome over the last century with ecological, hydrological and socioeconomic consequences. We assessed changes in tree density and basal area and estimated changes in rain interception by the canopies across a 5-year period over a biomass gradient in Cerrado vegetation protected from fire. We modelled throughfall, stemflow and net rainfall on the basis of tree basal area (TBA). Tree density increased by an average annual rate of 6.7%, basal area at 5.7% and rain interception by the canopies at 0.6% of the gross rainfall. Independent of the vegetation structure, we found a robust relationship of 0.9% less rainfall reaching the ground as TBA increases by 1 m 2 ha 21 . Increases in tree biomass with woody encroachment may potentially result in less water available for uptake by plants and to recharge rivers and groundwater reserves. Given that water is a seasonally scarce resource in all savannahs, woody encroachment may threaten the ecosystem services related to water resources.This article is part of the themed issue 'Tropical grassy biomes: linking ecology, human use and conservation'.

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“…The EEcA preserve includes 1312 ha of Cerrado vegetation and is one of the last remnants of Cerrado in the western part of São Paulo State. At present, the Cerrado in EEcA is composed of two distinct vegetation types: cerrado sensu stricto, a typical savanna physiognomy, in small patches, and cerradão, the forest type of Cerrado vegetation, in the majority of the area (Pinheiro & Durigan 2012). However, these vegetation types have changed considerably in the last decades, after suppression of fires and other disturbances, and the area occupied by Pteridium arachnoideum (Kaulf.)…”

Section: Study Areamentioning

confidence: 99%

Invasion impact by Pteridium arachnoideum (Kaulf.) Maxon (Dennstaedtiaceae) on a neotropical savanna

Guerin

Durigan

2015

Acta Bot. Bras.

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Whether management intervention is required to control biological invasions depends primarily on demonstrating species losses resulting from such invasions. Brackens of the Pteridium genus are currently regarded as a problem species that act as important ecological filters in the assembly of invaded communities. We investigated the effects of Pteridium arachnoideum invasion on the diversity, structure, floristic composition, and functional traits of cerradão in Assis, São Paulo, Brazil. We compared an invaded site with an adjacent non-invaded site. Bracken constrained the establishment of tree species, resulting in a community structure remarkably distinct from the non-invaded area. The density and basal area of the arboreal community were higher in non-invaded areas, but large trees were more frequent in the invaded areas. However, bracken did not reduce tree species diversity. Both richness and diversity were higher in the invaded area, indicating that over time, tree species richness and diversity naturally recovered, albeit slowly, in the invaded area. Therefore, one cannot attribute the loss of richness in the Cerrado vegetation to bracken invasion. Hence, we argue that, in this system, eradication of this invasive species is not likely to be cost effective, and thus, it should be a low management priority.

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Diferenças florísticas e estruturais entre fitofisionomias do cerrado em Assis, SP, Brasil

Cited by 45 publications

References 20 publications

Effects of soil and space on the woody species composition and vegetation structure of three Cerrado phytophysiognomies in the Cerrado-Amazon transition

Effects of soil and space on the woody species composition and vegetation structure of three Cerrado phytophysiognomies in the Cerrado-Amazon transition

Woody encroachment and its consequences on hydrological processes in the savannah

Invasion impact by Pteridium arachnoideum (Kaulf.) Maxon (Dennstaedtiaceae) on a neotropical savanna

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