Caracterização e dinâmica de duas fases sucessionais em floresta secundária da mata atlântica
TLDR
As avaliacoes floristicas mostraram, ainda, that as florestas no litoral catarinense se encontravam em dinâmica sucessional, e a densidade de plantas ramificadas e notadamente superior em estadios florestais secundarios iniciais, embora as taxas de incremento corrente anual fossem similares.Abstract:
Em Santa Catarina, foi observado aumento da cobertura florestal nas ultimas decadas, o que vem construindo uma paisagem florestal retalhada por um grande mosaico de fragmentos de varios estadios sucessionais. Neste trabalho, buscou-se avaliar o dinamismo do processo sucessional de dois diferentes estadios sucessionais. Em area florestal de 40 ha localizada no Municipio de Sao Pedro de Alcântara, SC, abandonada pelo uso agropecuario em meados de 1970, foram estabelecidas aleatoriamente parcelas permanentes (50 x 50 m), duas em estadio florestal secundario medio (SM) e quatro em estadio secundario avancado (SA). As avaliacoes anuais durante o periodo de 1994 a 2000 de todas as plantas arboreas com DAP >5 cm revelaram que no SM os valores da densidade de plantas, residentes, recrutadas, mortas e ramificadas foram superiores em relacao aos no SA. No entanto, a riqueza de especies, area basal e distribuicao diametrica foram superiores no SA. Botanicamente, foram observadas com muita clareza as especies e as familias dominantes de cada estadio e igualmente o dinamismo sucessional desse grupo de especies, aumento explosivo e posterior declinio e substituicao, evidenciando-se perfeitamente a funcionalidade dos grupos ecologicos nessa tipologia florestal. Por fim, destacou-se que a densidade de plantas ramificadas e notadamente superior em estadios florestais secundarios iniciais, embora as taxas de incremento corrente anual fossem similares. As avaliacoes floristicas mostraram, ainda, que as florestas no litoral catarinense se encontravam em dinâmica sucessional, em que especies climaxicas vem substituindo paulatinamente o grupo de especies pioneiras, elevando a diversidade de especies e a biomassa florestal.read more
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Riparian buffer zones as pesticide filters of no-till crops
T.R. Aguiar,T.R. Aguiar,T.R. Aguiar,F. R. Bortolozo,F. A. Hansel,K. Rasera,Maria Teresa Ferreira +6 more
TL;DR: The buffering capacity of the riparian one to retain pesticides in the water-saturated zone is investigated on 27 sites composed by riparian buffer zones with different vegetation structure (woody, shrubs, or grass vegetation) and width (12, 36, and 60 m).
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Drought effects on carbon dynamics of trees in a secondary Atlantic Forest
Samuel José Silva Soares da Rocha,Carlos Moreira Miquelino Eleto Torres,Paulo Henrique Villanova,Bruno Leão Said Schettini,Laércio Antônio Gonçalves Jacovine,Helio Garcia Leite,Eduardo Monteiro Gelcer,Leonardo Pequeno Reis,Karina Milagres Neves,Indira Bifano Comini,Liniker Fernandes da Silva +10 more
TL;DR: In this article, the effects of extreme weather events such as drought on tree mortality and carbon dynamics in a secondary Atlantic Forest were investigated. But the main goal of this study, was to understand the effect of drought on trees and how global climate change affects its ecosystem.
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Can plant DNA barcoding be implemented in species-rich tropical regions? A perspective from São Paulo State, Brazil.
Renato A. F. de Lima,Alexandre Adalardo de Oliveira,Gabriel Dalla Colletta,Gabriel Dalla Colletta,Thiago Bevilacqua Flores,Thiago Bevilacqua Flores,Rubens Luiz Gayoso Coelho,Pedro Leite da Silva Dias,Gabriel Ponzoni Frey,Amaia Iribar,Ricardo Ribeiro Rodrigues,Vinicius Castro Souza,Jérôme Chave +12 more
TL;DR: Conservation-oriented and ecological studies can already benefit from DNA barcoding to obtain more accurate species identifications, and which taxa remain underrepresented for the São Paulo tree flora is presented.
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Changes caused by forest logging in structure and floristic diversity of natural regeneration: Relationship between climate variables and forest dynamics in the eastern Amazon
Talita Godinho Bezerra,Ademir Roberto Ruschel,Fabiano Emmert,Rodrigo Geroni Mendes Nascimento +3 more
TL;DR: In this article, the authors investigated how the structure, composition and floristic diversity of the forest are influenced by forest logging in different phases of development of a local Amazonian forest, and whether there is a relationship between these attributes and regional and global climate factors.
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Horizontal structure and floristic composition of the shrubby-arboreal strata in forests planted to rehabilitate a degraded area of the Brazilian Atlantic Forest, Rio do Janeiro
Joana Farias dos Santos,Cristiane Roppa,Schweyka Stanley Holanda de Oliveira,Ricardo Valcarcel +3 more
TL;DR: The horizontal structure and floristic composition of the shrubby-arboreal strata on forests planted to rehabilitate a degraded area of the Brazilian Atlantic Forest, Rio do Janeiro, is studied.
References
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