Abstract
The application of spectroradiometry techniques to the study of tree species allows the acquisition of information related to plant physiology and morphology, which can be used in conjunction with orbital images. However, it is known that when a leaf is extracted the senescence process is started, which is characterized by cell constituents degradation, loss of water and modifications of the foliar mesophyll structure. In this context, this study aimed to evaluate the influence of the collection time and storage form on the spectral response of ipê-amarelo leaves. Thus, 32 leaves were collected in distinct times (1h, 2h, 24h and 48h) and conditioned with(C) and without(S) thermal storage. The data were evaluated from the visual analysis of the spectral curves, derivative analysis and statistical analysis. The experiment was conducted in a Randomized block design and data were submitted to analysis of variance (ANOVA) and Tukey test (p = 0.05). Results indicated that thermal storage might delay the senescence process of the leaves. Both the collection time and the storage form affect the pattern of spectral behavior of the leaves of ipê-amarelo. The collection time has not shown significant differences between 1-2h. The largest differences were found between 2-24h after collection.
Highlights
Remote sensing is a technique that investigates the interaction between electromagnetic radiation and different types of targets
The aforementioned treatments showed the lowest reflectances in the visible region and showed lower absorption peaks in the medium infrared region, a region frequently used for detecting hydric stress in vegetation (RODRIGUES et al 2016)
The indicative of hydric stress, indirectly evaluated here from the collection time of plant material, are based on spectral behavior of vegetation that is acquired according to composition, morphology and internal structure of the leaves (PONZONI et al, 2012)
Summary
Remote sensing is a technique that investigates the interaction between electromagnetic radiation and different types of targets. The appliance of this technique allows the acquisition of information on the distribution of different types of vegetation, phenological status, stress conditions, nutrient deficiency, among others. In the case of Brazilian native species, such as ipê-amarelo, the need for refinement of the remote sensing techniques at laboratory or field level is increasing, justifying the choice of this species. These techniques play an important role in a wide variety of scientific studies and allow monitoring changes in natural areas at different.
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