A proposed methodology for the correction of the Leaf Area Index measured with a ceptometer for pinus and eucalyptus forests = Proposta de uma methodologia para a correcao do indice de area foliar medido pelo ceptometro em provoamentos de pinus e eucalyptus

Lopes, Domingos Mendes, Walford, Nigel, Viana, Helda and Sette Jnr, Carlos Roberto (2016) A proposed methodology for the correction of the Leaf Area Index measured with a ceptometer for pinus and eucalyptus forests = Proposta de uma methodologia para a correcao do indice de area foliar medido pelo ceptometro em provoamentos de pinus e eucalyptus. Revista Arvore, 40(5), pp. 845-854. ISSN (print) 0100-6762

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Abstract

Leaf area index (LAI) is an important parameter controlling many biological and physiological processes associated with vegetation on the Earth's surface, such as photosynthesis, respiration, transpiration, carbon and nutrient cycle and rainfall interception. LAI can be measured indirectly by sunfleck ceptometers in an easy and non-destructive way but this practical methodology tends to underestimated when measured by these instruments. Trying to correct this underestimation, some previous studies heave proposed the multiplication of the observed LAI value by a constant correction factor. The assumption of this work is LAI obtained from the allometric equations are not so problematic and can be used as a reference LAI to develop a new methodology to correct the ceptometer one. This new methodology indicates that the bias (the difference between the ceptometer and the reference LAI) is estimated as a function of the basal area per unit ground area and that bias is summed to the measured value. This study has proved that while the measured Pinus LAI needs a correction, there is no need for that correction for the Eucalyptus LAI. However, even for this last specie the proposed methodology gives closer estimations to the real LAI values.

Item Type: Article
Additional Information: Article published from doctoral research of Dr Lopes carried out at Kingston Univesity
Uncontrolled Keywords: LAI bias, LAI underestimation, clumping, basal area
Research Area: Biological sciences
Earth systems and environmental sciences
Geography and environmental studies
Faculty, School or Research Centre: Faculty of Science, Engineering and Computing (until 2017) > School of Geography, Geology and the Environment
Depositing User: Nigel Walford
Date Deposited: 03 Nov 2016 14:16
Last Modified: 29 Jun 2017 08:48
DOI: https://doi.org/10.1590/0100-67622016000500008
URI: http://eprints.kingston.ac.uk/id/eprint/36351

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