As espécies de tauari (Lecythidaceae) em florestas de terra firme da Amazônia: padrões de distribuição geográfica, abundâncias e implicações para a conservação
Abstract:Conhecer a distribuição de uma espécie é essencial para o conhecimento de sua ecologia e conservação. Neste estudo, foram levantadas a composição, a abundância, a estrutura diamétrica e a distribuição geográfica das espécies de tauari (Lecythidaceae), um dos grupos de árvores mais explorados na Amazônia. Foram utilizados dados de herbários para definir a área de distribuição das espécies e inventários em seis áreas do bioma (totalizando 401,25 ha) para estimar abundâncias e estruturas diamétricas. Das 14 espéc… Show more
“…In this vegetation type, 31 species (53.4%) were found with only one individual. C. oblongifolia was also found in Eastern Amazon (Mazzei et al 2010, Procópio et al 2010) and also in French Guiana, Guyana and Suriname (Funk et al 2007). …”
Viruá National Park encompasses a vast and complex system of hydromorphic sandy soils covered largely by the white sand vegetation ("Campinarana") ecosystem. The purpose of this study was to investigate a vegetation gradient of "terra-firme"-white sand vegetation at the Viruá National Park. Nine plots representing three physiognomic units were installed for floristic and phytosociological surveys as well as to collect composite soil samples. The data were subjected to assessments of floristic diversity and similarity, phytosociological parameters and to statistical analyses, focused on principal components (PC) and canonical correspondence analysis (CCA). The vegetation of the Campinaranas types and Forest differed in biomass and species density. Ten species, endemic to Brazil, were particularly well-represented. PC and CCA indicated a clear distinction between the studied plots, based on measured soil variables, especially base sum and clay, which were the most differentiating properties between Campinarana and Forest; For the separation of the Campinarana types, the main distinguishing variable was organic matter content and cation exchange capacity. Higher similarity of Campinaranas was associated to a monodominant species and the lower similarity of Forest was related to the high occurrence of locally rare species.
“…In this vegetation type, 31 species (53.4%) were found with only one individual. C. oblongifolia was also found in Eastern Amazon (Mazzei et al 2010, Procópio et al 2010) and also in French Guiana, Guyana and Suriname (Funk et al 2007). …”
Viruá National Park encompasses a vast and complex system of hydromorphic sandy soils covered largely by the white sand vegetation ("Campinarana") ecosystem. The purpose of this study was to investigate a vegetation gradient of "terra-firme"-white sand vegetation at the Viruá National Park. Nine plots representing three physiognomic units were installed for floristic and phytosociological surveys as well as to collect composite soil samples. The data were subjected to assessments of floristic diversity and similarity, phytosociological parameters and to statistical analyses, focused on principal components (PC) and canonical correspondence analysis (CCA). The vegetation of the Campinaranas types and Forest differed in biomass and species density. Ten species, endemic to Brazil, were particularly well-represented. PC and CCA indicated a clear distinction between the studied plots, based on measured soil variables, especially base sum and clay, which were the most differentiating properties between Campinarana and Forest; For the separation of the Campinarana types, the main distinguishing variable was organic matter content and cation exchange capacity. Higher similarity of Campinaranas was associated to a monodominant species and the lower similarity of Forest was related to the high occurrence of locally rare species.
“…The Amazon wealth is characterized by the rarity of species [67], and knowledge about the density per species to define the degree of their conservation is limited [68]. The minimum population density (>0.15 trees ha −1 ) defined in this study takes into account the stages of plant development [69] so that the richness, diversity, and productivity of multiple species are maintained.…”
This article addresses a case study on the application of criteria for harvesting, aiming at restoration and profitability in a degraded tropical forest in the Amazon. The objective is to provide technical and economic information to promote a truly sustainable silvicultural management system in forests with this profile and turn them into a desirable financial asset for conservation and social development. In the forest census, 85.907 trees ha−1 (100.8566 m3 ha−1) were inventoried with diameter at breast height (dbh) ≥ 25 cm, belonging to 106 commercial species. When applying the harvest criteria, 19.923 trees ha−1 (29.99 m3 ha−1), referring to 53 species, were destined for harvest. Some trees were selected by more than one criterion, totalizing 17.985 trees ha−1 by density, 1.831 trees ha−1 by compromised health, 0.212 trees ha−1 by maximum dbh, 18.933 trees ha−1 by minimum dbh, 1.385 trees ha−1 by tree stem (quality 3), and 0.080 trees ha−1 by species conservation. In all scenarios, the application of criteria for harvesting proved to be profitable with excellent cost–benefit ratios. The selection of trees with a minimum cutting diameter of 25 cm in shorter cycles tends to allow the promotion of new commercial species. The set of actions presented has the potential to favor the maintenance of biodiversity and expansion of low-density populations, health and the potential increment of the forest productivity. In addition, it is more feasible for the supply of forest products in a shorter time than provided for in Brazilian regulations; however, they must respect the specificities of the species and also of the site.
“…Couratari is a frequent genus in the Amazon region, as reported by Procópio et al (2010), who studied the geographic distribution patterns of species commonly known as "tauari" in dry land forests of the Amazon region. They encountered C. guianensis, C. stellata and C. oblongifolia in all the six studied areas, located in Pará, Amazon region and French Guyana.…”
Dynamics of Lecythidaceae species were evaluated 13 years after logging in a dense tropical rain forest located in the municipality of Moju, Pará (02º 08' 14'' and 02º 12' 26" S; 48º 47' 34"S and 48º 48' 14" W -SAD 69). Two hundred ha out of a 1,050 ha forest area were selectively logged for timber (23 m 3 ha-1 harvested from 25 species) in 1997. Twenty-two permanent sample plots of 0.5 ha (11 ha sample area) were established and all trees with DBH ≥ 10 cm were measured and identified in 1995, 1998 and 2010. Density (trees ha -1 ) and basal area (m 2 ha -1) of the species were evaluated in the three occasions. The opening of canopy caused by logging reduced the density and basal area of five species, but produced a positive response in nine species, boosting their natural regeneration and allowing the ingrowth of one species that was not present in the studied area in the beginning.
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