Resposta hiperespectral na determinação do conteúdo de água na folha em diferentes espécies de &lt;i&gt;Eucalyptus&lt;/i&gt; spp.

Strabeli, Taila Fernanda

doi:10.11606/d.11.2016.tde-29112016-145434

Cited by 1 publication

(1 citation statement)

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“…Regarding the interactions with humidity, the spectral response of the individuals of the cycles was similar to those of Magnolia grandiflora trees, with moisture content of 50 and 75% [25]. It was also similar response spectral obtained of the experiment Strabeli in individuals of E. saligna, with water related content ranging from 68% to 83% [26]. Regarding the changes in reflectance, due to changes in water characteristics in individuals, these were not highly dissimilar to the properties of healthy vegetation, because as a function of humidity, they will only be substantial when the leaf turgor is less than 75% [27].…”

Section: Discussionsupporting

confidence: 67%

Spectral Response of Eucalyptus saligna under Water Stress in Southern Brazil

Melo

Santos

Silva

et al. 2019

JEAI

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The present work aims to assess the effect of water stress on the reflectance emitted by leaves of Eucalyptus saligna individuals. The design was completely randomized and the study comprised 30 subjects who underwent 5 cycles of drought simulation, 45 days each. Five individuals were submitted to water deficit treatment and five were used as controls, remaining in adequate water conditions. The experiment and data collection were performed in the external facilities of the forest management laboratory of the Federal University of Santa Maria, Rio Grande do Sul, Brazil. Which it comprised the period from September 2014 to April 2015. Spectral information was collected from 24-month-old tree individuals in adequate water and water stress situations by means of FieldSpec®3 spectroradiometer. Subsequently, the spectral data for the electromagnetic spectrum range from 400 nm to 1700 nm were processed and analyzed. The resulting spectral behavior varied between water stress cycles. In the 450 nm wavelength range, the reflectances ranged from 3.8% to 7.4%, at 550 nm from 7.9% to 14% and at 650 nm from 4.8% to 8.8%. In the near infrared region, in the 900 nm to 1300 nm range, the reflectances ranged from 28% to 62%. The spectral response of E. saligna showed minimal differences when compared to healthy green vegetation, even though it was exposed to water deficit situations. From the information obtained, this research can be used as a parameter for comparative analysis between species belonging to the genus Eucalyptus sp.

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Section: Discussionsupporting

confidence: 67%