Revista de Gestão Costeira Integrada
Volume 18, Issue 1, March 2018, Pages 41-48

DOI: 10.5894/rgci-n119
* Submission: 5 JUN 2017; Peer review: 1 OCT 2017; Revised: 6 NOV 2017; Accepted: 6 NOV 2017; Available on-line: 29 JUN 2018

Leaf area index and vegetation cover of the Paripe river mangrove, Pernambuco, Brazil, in 1997 and 2017

Índice de área foliar e cobertura vegetal no manguezal do rio Paripe, Pernambuco, Brasil, em 1997 e 2017

Thereza Christina Costa Medeiros¹, Everardo Sampaio², Diego Marcelino Nascimento³

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¹ Fundação Universidade Federal de Tocantins, Congregação de Geografia. Email: thereza@uft.edu.br
² Universidade Federal de Pernambuc, Departamento de Energia Nuclear. Email: esampaio@ufpe.br.
³ Universidade Federal de Pernambuco, Departamento de Energia Nuclear. Email: diegoandaluz@gmail.com.

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ASBTRACT
The leaf area index (LAI) was estimated for Rhizophora mangle, Laguncularia racemosa and Avicennia schaueriana, based on the average leaf size, number of leaves in each growth apex, number of apices per plant and number of plants per hectare. Crown projection areas were also determined. The number, size and biomass of leaves per growth apex varied little among plant stem diameter classes and were higher in R. mangle than in L. racemosa and A. schaueriana. The number of apices and the crown projection area increased greatly in plants with larger stem diameters. R. mangle contributed (82%) to most of the total leaf area index (3.96), due to the combination of high plant densities, large plants, many apices and large leaves. The leaf areas corresponded to normalized difference vegetation indices (NDVI) from 0.68 to 0.77 in 1997 and from 0.74 to 0.80 in 2017. Therefore, contrary to many other mangroves in the world, the vegetation of the Paripe river has been relatively protected from human impact in the last twenty years

Keywords: leaf size and mass; crown area; species; Rhizophora mangle; NDVI change.

RESUMO
O índice de área foliar (IAF) foi estimado para Rhizophora mangle, Laguncularia racemosa e Avicennia schaueriana, baseado na área média das folhas, no número de folhas por ápice de crescimento, no número de ápices por planta e no número de plantas por ha. Também foi determinada a área de projeção das copas. O número, tamanho e biomassa das folhas em cada ápice de crescimento variou pouco com a classe de diâmetro do caule das plantas e foram maiores em R. mangle que em L. racemosa e A. schaueriana. O número de ápices e as projeções das copas aumentaram muito em plantas com maiores diâmetros de caule. R. mangle é o que mais contribui (82%) para o índice de área foliar do manguezal (3.96), pela combinação de alta densidade de plantas e plantas grandes, com muitas e grandes folhas. As áreas foliares corresponderam a índices de vegetação (NDVI) de 0.68 a 0.77, em 1997, e de 0.74 a 0.80, em 2017. Portanto, ao contrário do que tem acontecido com muitos manguezais no mundo, a vegetação do rio Paripe tem sido relativamente protegida dos impactos humanos nos últimos 20 anos.

Palavras-chave: tamanho e biomassa de folhas, área de copa, espécies, Rhizophora mangle, mudanças de NDVI.

 

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