Monitoring plant response to phenanthrene using the red edge of canopy hyperspectral reflectance

Abstract

a b s t r a c tTo investigate the mechanisms and potential for the remote sensing of phenanthrene-induced vegetation stress, we measured field canopy spectra, and associated plant and soil parameters in the field controlled experiment in the Yellow River Delta of China. Two widely distributed plant communities, separately dominated by reed (Phragmites australis) and glaucous seepweed (Suaeda salsa), were treated with different doses of phenanthrene. The canopy spectral changes of plant community resulted from the decreases of biomass and foliar projective coverage, while leaf photosynthetic pigment concentrations showed no significance difference among treatments. The spectral response to phenanthrene included a flattened red edge, with decreased first derivative of reflectance. The red edge slope and area consistently responded to phenanthrene, showing a strong relationship with aboveground biomass, coverage and canopy pigments density. These results suggest the potential of remote sensing and the importance of field validation to correctly interpret the causes of the spectral changes.

Application of PROSPECT for estimating total petroleum hydrocarbons in contaminated soils from leaf optical properties

“…When considering a single species, the spectral signatures also varied temporally with season changes, especially in the VIS and the red-edge regions. The summer of 2017 was characterized by repeated heat waves (June), and reflectance was particularly low for all species, varying between 550 and 680 nm and affecting the red-edge region on the following sampling dates, an indication of changes in leaf pigment contents [66,70]. Likewise, reflectance in the near-and short-wave infrared regions was also affected by the seasons, a sign of changes in leaf anatomy and water content [52,[71][72].…”

Detection and discrimination of various oil-contaminated soils using vegetation reflectance

“…TPH and heavy metals (HM) present in oil both affect vegetation biochemical and biophysical parameters related to leaf optical properties (Athar et al 2016, Balliana et al 2017, Baruah et al 2014, Nagajyoti et al 2010. Authors noticed alterations of leaf anatomy, pigment and water contents under TPH and HM exposure, resulting in reflectance modifications at corresponding wavelengths (Lassalle et al 2017, Rosso et al 2005, Sanches et al 2013a, Zhu et al 2014. By exploiting these modifications, it is thus possible to detect oil in soils from the spectral signature of vegetation.…”

Evaluating Metal Effects on the Reflectance Spectra of Plant Leaves during Different Seasons in Post-Mining Areas, China

“…However, the vegetation spectral properties are a function that depends on the many geographical variations and applying the results of the laboratory to the natural environment still needs to be explored [17][18][19]. Field studies that examine the plant response to metal-contaminated soil have mostly focused on old waste deposit sites [1][2][3], river floodplains [19,20], polluted farms [21,22], etc. In these studies, the dominant species of plant in specific growth stages were selected as the study object, and then the VIs were used to explore relationships between the metal content and spectral response.…”