Discriminação de espécies florestais com a utilizaçao da razão isotópica 13 C e 15 N e espectroscopia no infra-vermelho próximo (FT-NIRs))
The combined use of high technology instruments and appropriate techniques for discriminating tree species isnecessary to improve the biodiversity inventory system in tropical countries. This study was carried out to verify the performance of C and N isotopes ratios, the total leaf concentration...
| Autor principal: | Durgante, Flávia Machado |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/5111 |
| Resumo: |
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The combined use of high technology instruments and appropriate techniques
for discriminating tree species isnecessary to improve the biodiversity inventory
system in tropical countries. This study was carried out to verify the
performance of C and N isotopes ratios, the total leaf concentration values of C
and N (%) and near-infrared spectroscopy readings as indicators to discriminate
eight species of Eschweilera and two of Corythophora of the Brazilian Amazon.
It was observed that the isotopes analysis and the leaf N and C
concentrationswere not reliable enough to discriminate the studied species.
However, the near infrared spectroscopy (FT-NIRS) presented an outstanding
performance; therefore, it seems to be a promising tool to improve tree species
discrimination system. Utilizing thirty-six spectral readings to represent an
individual, we obtained 99.4% of correct species discrimination. When only one
spectral reading from any part of the leaf was used, the correct discrimination
reached 97.1 %.In the near future, a portable FT-NIRS, for instance, could be
used in forest inventory data collection. The only requirement is the memory
feeding, which should be done using the most reliable and consistent botanical
identification of the most abundant Amazonian tree species. This process
should be refined over time with the feedback from new inventories. By any
means, the use of FT-NIRS has demonstrated that it is much more reliable than
the rule of thumb highly practiced for tree identification during forest inventory
carried out in the Brazilian Amazon. |