Características fotossintéticas, nutricionais e hídricas de espécies arbóreas em diferentes estratos florestais de uma floresta primária do alto Rio Negro
Is average fact in the world scientific literature that tropical forests are important for the maintenance of the regional climate and, even global. In the context of the climatic changes, to know the dynamics of the gas changes in the inferior strata of the forest is very importance to understand t...
| Autor principal: | Nina Junior, Adamir da Rocha |
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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/1/5066 http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4745554D7 |
| Resumo: |
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Is average fact in the world scientific literature that tropical forests are important for the maintenance of the regional climate and, even global. In the context of the climatic changes, to know the dynamics of the gas changes in the inferior strata of the forest is very importance to understand the modifications in the participation of carbon in different forest environments and their contributions for the interaction between forest and climate. In that sense, this work had as objective Investigates the gas changes between plant -atmosphere in different forest strata. For so, six arboreal species were selected and marked with GPS in the experimental sites of the LBA inside of the National Park of the Pico da Neblina, in São Gabriel of the Cachoeira, to the northwest of the state of Amazon, distant 860 km of Manaus (0º 12' 44" N and 66º 45' 53" W). The studied species were Nephelium litchi and Lecythis idatimon of the canopy, Conceveiba guianensis and Protium macrophylum of the sub-canopy and Bocageopsis multiflora and Irynthera elliptica of the subforest. The Climatic data were obtained from LBA Project observation towers installed already at the place. The studied individuals were in ray of 200 m around of the tower. In the one what does tell respect the studied physiologic variables, were they appraised the specific leaf area (SLA), the potential of water in the leaf (ΨW), the gas exchanges, leaves nutrients, the content of chlorophylls (ICC) and the characteristics of the fluorescence of the chlorophyll a. The results demonstrate that N. Litchi (canopy) did it present the greatest photosynthesis t. However L. Idatimon, also of canopy it didn't present difference in relation to the other strata, with which the variables of gas exchanges were homogeneous. The studied species didn't differ as the efficiency in the use of the water, suggesting there not to be limitation of this resource in the soil-plant atmosphere sistem. As for the use of the nutrients, N. Litchi show largest efficiency. In what it concerns ICC, the great values were exhibited by the species of the sub-forest. As for the transient of the fluorescence of the chlorophyll the, the results show that the sub-forest species are more efficient in the capture of luminous energy. On the other hand, the efficiency of the species of the superior strata is larger. PIABS was better parameter to evaluate the acting of the species as the light use, and it demonstrated that so much the species of the canopy, with I. elliptica, of the sub-forest, it has larger efficiency photochemical that the others. Additionally, photoinhibition signs were not observed in none of the studied species, or evidences of smaller capacity photosynthetic in the species of the inferior strata. Therefore, in the conditions of experimental site estudied, suggest that the different forest strata show contribuition a homogeneous for the gas exchanges in the plant-atmosphere interactions. |