Análise e estimativa dos componentes do balanço de energia em ecossistema de manguezal amazônico

Abstract

RESUMO O objetivo do presente trabalho é analisar a importância dos mapas mentais na percepção ambiental de alunos do 6º ano do Ensino de Ciências, quanto ao ecossistema manguezal. Para tanto, foi solicitado aos alunos que representassem o manguezal através de desenhos (mapas mentais), no intuito de avaliar o nível de percepção ambiental e de que maneira o ecossistema manguezal é visto por esses discentes. A análise foi feita através de categorização temática, permitindo a sistematização e interpretação das informações contidas nas redações sobre os temas mais citados pelos alunos. Nos mapas mentais e redações constatou-se que a paisagem afeta o indivíduo e vice-versa, através de diversidades de interpretações positivas e negativas, com algumas visões distorcidas e depreciativas quanto ao ecossistema manguezal. Os resultados revelam a necessidade de se fazer uma abordagem mais integradora e sistêmica dos assuntos discutidos em sala de aula, revelando a urgência de rever os métodos e práticas empregados durante o processo de ensino. Palavras chave: Percepção ambiental, Mapas mentais, Manguezal. ABSTRACT The objective of the present work is to analyze the importance of mental maps in the environmental perception of students of the 6th year of Science Teaching, regarding the mangrove ecosystem. To do so, the students were asked to represent the mangrove through drawings (mental maps), in order to evaluate the level of environmental perception and how the mangrove ecosystem is seen by these students. The analysis was made through thematic categorization, allowing the systematization and interpretation of the information contained in the essays on the topics most cited by the students. In the mental maps and essays it was observed that the landscape affects the individual and vice versa, through diversities of positive and negative interpretations, with some distorted and derogatory visions regarding the mangrove ecosystem. The results reveal the need to take a more integrative and systemic approach to the subjects discussed in the classroom, revealing the urgency to review the methods and practices used during the teaching process.

Analysis of the energy balance and CO2 flow under the influence of the seasonality of climatic elements in a mangrove ecosystem in Eastern Amazon

“…According to climatic studies by Pereira and Rodrigues ( 2013 ) and Silva Junior et al ( 2006 ), in the mangrove ecosystem of Bragança (State of Pará), the months of February, March, and April are the rainiest, with March being the one with the highest accumulated precipitation, with values above 700 mm for the years from 2001 to 2003.…”

“…3B). Pereira and Rodrigues (2013), analyzing the energy partition in the mangrove ecosystem on the coast of Pará, found that in the wet season, the maximum value of H occurred in January at 1:00 pm with 274.7 W m −2 . On the other hand, the maximum LE observed occurred in May at 11:00 am with 374.7 W m −2 .…”

“…Micrometeorological measurements at mangroves in the Northeastern coast of Pará from November 2002 to August 2003 showed that the seasonal and hourly variations of E and LE fluxes and the evaluation of the energy partition and the Rn presented high values during the dry season. Bowen’s ratio showed a generally low value in the wet season, indicating a higher proportion of energy was used as latent heat (Pereira and Rodrigues 2013 ).…”