An accurate retrieval of leaf water content from mid to thermal infrared spectra using continuous wavelet analysis

Ullah, Saleem; Skidmore, Andrew K.; Naeem, Mohammad; Schlerf, Martin

doi:10.1016/j.scitotenv.2012.08.025

Cited by 90 publications

(46 citation statements)

References 62 publications

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“…In turn, this could be scaled up to investigate how changes in plant quality, biomass, and diversity affect insect herbivore populations and communities, as well as inform ecosystem dynamics. The use of remote sensing to assess changes in plant nutrient content (Foley et al , Zengeya et al ) and other plant characteristics such as water content (Ullah et al ), biomass (Ullah et al ), and possibly even plant diversity (Gould ), could facilitate model validation and real world application at landscape and regional scales.…”

Section: Discussionmentioning

confidence: 99%

Water stress in grasslands: dynamic responses of plants and insect herbivores

Lenhart

Eubanks

Behmer

2014

Oikos

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Global climate change is altering precipitation patterns. Th e eff ect of water stress on plant -herbivore interactions is poorly understood even though this is a primary ecological interaction that will be altered by climate change. Th is is especially true for grasslands where water is often limiting. In this study we manipulated water inputs in open grassland plots (1 m 2 ) during a severe drought and assessed plant and insect herbivore responses. Th ere were two watering treatments: ambient and supplemented. Supplemented plots received water weekly in amounts that mimicked average seasonal rainfall. For plants, we were interested in how water input aff ected protein and digestible carbohydrate content; previous studies predicted water stress would increase the concentration of these two nutrients. Grasshoppers are the dominant insect herbivores in grasslands and we assessed their responses to water inputs by measuring abundance and diversity. Previous studies suggested grasshoppers would prefer water-stressed plots. Protein and carbohydrate content in bulk grass and forb samples, plus plant biomass and diversity, were measured monthly (May -August). Immediately prior to harvesting plant tissue, we counted and identifi ed individual grasshoppers in each plot. Grass biomass was reduced with water stress, but macronutrient content and species diversity were unaff ected. After three months water-stressed forbs were less protein biased, and diverse, relative to watered forbs; forb biomass was indistinguishable between treatments. Grasshopper abundance and diversity were lower in water-stressed plots as the season progressed. However, grasshopper-feeding biology mattered: densities of mixed-feeders and grass-feeders, but not forb-specialists, decreased over time in water-stressed plots, but not in water supplemented plots. Our results demonstrate the importance of focusing on plant and insect herbivore functional groups and provide valuable new data that can be incorporated into models to explore the eff ects of global climate change in greater detail.

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Section: Discussionmentioning

confidence: 99%

Water stress in grasslands: dynamic responses of plants and insect herbivores

Lenhart

Eubanks

Behmer

2014

Oikos

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“…However, many factors control the variation of leaf and canopy reflectance. At the leaf level, water contents, morphological and anatomical properties, and other biochemical components also explain the change of spectral signals (Ullah et al, 2012). At the canopy level, the green biomass, coverage, leaf area index (LAI) and canopy architecture can predict the canopy reflectance of plants (Zhu et al, 2013;Zhang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Chen

Wang

et al. 2014

Marine Pollution Bulletin

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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.

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“…A strong relation between water loss and decrease in emissivity in the MWIR has been widely reported for senescent leaves (French et al 2000), and leaves under short-term dehydration and different water contents Gerber et al 2011;Salisbury and D'Aria 1992;Salisbury and Milton 1988;Ullah et al 2012b). It has also been used for calculating the mid-wave infrared water index (MWI) (Ullah et al 2013).…”

Section: Changes In Mwirmentioning

confidence: 86%

Infrared spectroscopy of leaf traits: Detecting plant stress and identifying plant species

Acevedo¹

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An accurate retrieval of leaf water content from mid to thermal infrared spectra using continuous wavelet analysis

Cited by 90 publications

References 62 publications

Water stress in grasslands: dynamic responses of plants and insect herbivores

Water stress in grasslands: dynamic responses of plants and insect herbivores

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

Infrared spectroscopy of leaf traits: Detecting plant stress and identifying plant species

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