Nitrogênio total em folhas e sua relação com o incremento em biomassa de florestas primária e manejada na Amazônia
Forest productivity is strongly related to local nitrogen and can be used to predict local productivity. Thus, understanding nitrogen distribution is an alternative to locate areas of productivity and make possible sustainable use of resources. This work aims to understand how the distribution of le...
| Autor principal: | Felsemburgh, Cristina Aledi |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/5078 http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4744245A3 |
| Resumo: |
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Forest productivity is strongly related to local nitrogen and can be used to predict local productivity. Thus, understanding nitrogen distribution is an alternative to locate areas of productivity and make possible sustainable use of resources. This work aims to understand how the distribution of leaf nitrogen content of canopy in a terra-firme forest is related to increment of biomass of forest systems exposed to different levels of intensity of selective exploitation of wood. This research was carried out at the Experimental Station for Tropical Forest Research (Núcleo ZF2) of the National Institute of Research of the Amazon (INPA). The experiment was developed in two transects of the component Manejo Florestal of the Jacaranda Project (INPA/JICA) in area of Bionte - Biomass and Forest Nutrients (MCT-INPA
and DFID), with four treatments being: T0 the primary forest, T1, T2 and T3 representing the forest with removal of commercial basal area of 32%, 42% and 69%, respectively. The vegetal material was in 20 x 20 m plots. Three leaves in good phytosanitary conditions completely expanded and exposed to solar radiation were collected of each arboreal individual with diameter at breast height (DAP)higher or equal to 10 cm. These characteristics were evaluated: with a portable chlorophyll meter reading (SPAD-502), leaf area related to diameter of hole (AF),
specific leaf area (SLA), foliar nitrogen content (N), diameter at breast height (DHB), current increment annual (ICA) and relative growth (RG). The results showed that leaf nitrogen content, the characteristic biophysical of specific leaf area and the value of unity SPAD did not present significant difference between treatments (P < 0,01), however, increment of area of primary forest was higher than those verified in the treatments with selective cut of wood (DMS = 0,01). Increment was not well correlated with N, AEF and SPAD being all (r) lower than 0,19. When the forest was evaluated as a whole, it was noticed weak correlations between AEF and nitrogen presenting (r = 0,56; P < 0,001) and SPAD with nitrogen (r = 0,39; P < 0,01), however, when these correlations were evaluated considering genera, N had better relation with AEF (Byrsonia, r2 = 0,74; Licania, r2 = 0,69 and Miconia, r2 = 0,79, all with P < 0,01) and only for some genera SPAD was correlated with nitrogen (Byrsonia, r2 = 0,02 and P = 0,44; Licania, r2 = 0,45 and P < 0,01; Miconia,
r2 = 0,63 and P < 0,01). |