Avaliação de dois Métodos para Estimativa do Indice de Área Foliar em Floresta de Transição Amazônia-Cerrado

Segundo Durval Pereira de Resende, Francisco de Almeida Lobo, Higo José Dalmagro, Marcelo Sacardi Biudes, Osvaldo Borges Pinto Júnior, José de Souza Nogueira, George Louis Vourlitis

Abstract


The estimated leaf area index in Amazonian forest ecosystems has been held, in majority, by methods that include intensity and qualitybalance of electromagnetic radiation transmitted through the canopy. Toincrease the results reliability, it is necessary to test alternatives to estimatethe leaf area index. Thus, the objective of this paper was to test an alternativemethod to Monsi and Saeki (1953), proposed by Charles-Edwards and Lawn(1984).The comparative analyses were performed with data ofphotosynthetic active radiation obtained from a micrometeorological towerinstalled in a transitional area of the Amazonian forest to Savannah in 2003.The method proposed by Charles-Edwards and Lawn (1984) supplies valuesof the fraction of radiation intercepted significantly different from the Monsiand Saeki (1953) method. Although it has not been observed any significantdifference between the leaf area index calculated by both methods, thealternative method presented limitations to be used in forest ecosystems.Therefore, further studies in different forest ecosystems are needed toconfirm the use of both methods.



DOI: https://doi.org/10.5902/2179460X9492

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