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O clima de uma area e um dos fatores determinantes da dinâmica da vegetacao e a fenologia estuda a ocorrencia dos eventos vegetativos e reprodutivos das plantas desencadeados principalmente pela precipitacao, temperatura e fotoperiodo. Os estudos fenologicos com samambaias, no mundo, aumentaram nas ultimas decadas, porem os seus resultados sao geralmente descritivos e restritos a poucos locais e a poucas especies. Foram determinados o padrao e a sazonalidade das fenofases de Blechnum acutum, em Floresta Atlântica subtropical, relacionando-as com os fatores climaticos, a partir do monitoramento de 20 individuos, durante 18 meses. Para verificar a sazonalidade das fenofases foi utilizada a estatistica circular. Blechnum acutum apresentou maior intensidade da renovacao foliar em janeiro (38%), com maior periodo de atividade entre janeiro e abril de 2014. A formacao de esporângios foi a fenofase que demonstrou o padrao sazonal mais evidente e ocorreu com maior intensidade e atividade em outubro de 2014 (25%). A senescencia foliar manifestou maior intensidade em fevereiro de 2014 (23%), com 80% dos individuos encontrando-se nesta fenofase, em marco de 2015. Os padroes fenologicos nao demonstraram a mesma continuidade e regularidade em decorrencia principalmente da falta de homogeneidade na manifestacao da renovacao e senescencia das folhas pelos individuos na populacao. Os ritmos fenologicos de B. acutum tambem nao foram igualmente influenciados pelas variaveis ambientais analisadas, sendo que a renovacao foliar foi a unica fenofase relacionada com temperatura e fotoperiodo. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri",sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:PT-BR;} A B S T R A C T The climate of an area is one of the determining factors of the vegetation’s dynamics and phenology studies. The occurrence of vegetative and reproductive events of plants mainly triggered by rainfall, temperature and photoperiod. The phenological studies with ferns in the world have increased in recent decades, but the results are usually descriptive and restricted to few places and few species. It was determined the pattern and seasonality of phenophases of Blechnum acutum in subtropical Atlantic Forest, relating them to the climatic factors, from monitoring 20 individuals for 18 months. To check the seasonality of phenophases the circular statistics were used. Blechnum acutum showed greater intensity of foliar renovation in January (38%), with higher activity period between January and April 2014. The sporangia formation was the phenophase that showed the most obvious seasonal pattern and was more intense and activity in October 2014 (25%). The leaf senescence showed greater intensity in February 2014 (23%), with 80% of individuals meeting in this phenophase in March 2015. The phenological patterns did not show the same continuity and regularity mainly due to the lack of homogeneity in the manifestation renewal and senescence of leaves by individuals in the population. The phenological rhythms of B. acutum were not also influenced by environmental variables, and the leaf renewal was the only phenophase related to temperature and photoperiod. Keywords: climate, photoperiod, sazonality, phenophase, fern. [1]

revista brasileira de geografia física

Fenologia de Blechnum acutum (Desv.) Mett. (Blechnaceae) em Floresta Atlântica Subtropical (Phenology of Blechnum acutum (Desv.) Mett. (Blechnaceae) in Atlantic Subtropical Forest)