Lola Suárez | RMIT University (original) (raw)

Papers by Lola Suárez

Research paper thumbnail of Estimation of Biophysical Parameters in Mediterranean Conifer Forest Under Decline Condition by Using Ahs Airborne Data

earsel.org

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Research paper thumbnail of RESPONSE TO REGULATED DEFICIT IRRIGATION OF A NECTARINE ORCHARD IN SOUTHERN SPAIN

XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on CLIMWATER 2010: Horticultural Use of Water in a Changing Climate, 2011

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Research paper thumbnail of Field sampling protocol for foliage chemistry assessment: Applicability over varied forest sites in Australia

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Research paper thumbnail of Understanding the variability in ground-based methods for retrieving canopy openness, gap fraction, and leaf area index in diverse forest systems

Agricultural and Forest Meteorology, 2015

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Research paper thumbnail of RESPONSES TO REGULATED DEFICIT IRRIGATION OF A NECTARINE ORCHARD IN SOUTHERN SPAIN (S15. 215)

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Research paper thumbnail of Almond tree canopy temperature reveals intra-crown variability that is water stress-dependent

Agricultural and Forest Meteorology, 2012

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Research paper thumbnail of A PRI-based water stress index combining structural and chlorophyll effects: Assessment using diurnal narrow-band airborne imagery and the CWSI thermal index

Remote Sensing of Environment, 2013

ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance In... more ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance Index (PRI) as an indicator of water stress, over a range of canopy structures and pigment content levels. Very high resolution (VHR) narrow-band multispectral (10 cm) and thermal (20 cm) imagery was acquired diurnally, in four airborne campaigns conducted over an experimental vineyard site undergoing three different irrigation treatments. Field measurements of leaf stomatal conductance (G(s)) and leaf water potential (Psi(leaf)) were acquired concurrently with the airborne campaigns and compared against the Crop Water Stress Index (CWSI), a widely accepted, thermal-based indicator of water stress, and against narrow-band multispectral indices calculated from pure-vegetation pixels. The study proposes a new formulation, a normalized PRI (PRInorm), in which the standard PRI index is normalized by an index that is sensitive to canopy structure (Renormalized Difference Vegetation Index, RDVI) and by a red edge index that is sensitive to chlorophyll content (R-700/R-670). The hypothesis investigated is that the new index, calculated as PRInorm = PRI/[RDVI center dot R-700/R-670], not only detects xanthophyll pigment changes as a function of water stress, but also normalizes for the chlorophyll content level and canopy leaf area reduction induced by stress. Results demonstrated that when comparing PRInorm against stomatal conductance (r(2) = 0.79; p <0.001) and leaf water potential (r(2) = 0.77; p < 0.001) measured at midday, the new index performed better than the standard PRI (r(2) = 0.52 and 0.49, respectively). Further, when using the four flights conducted during the diurnal experiment, the relationships with stomatal conductance also showed the superior performance of PRInorm (r(2) = 0.68) as opposed to PRI (r(2) = 0.4). The proposed normalized PRI was highly related (r(2) = 0.75; p <0.001) to the thermal indicator of water stress, CWSI, which was used here as a benchmark. In comparison, the standard PRI index was found to be significantly related to CWSI (p < 0.001), although the relationship was weaker (r(2) = 0.58) than that obtained for PRInorm. In summary, this study demonstrates that PRInorm isolated better than PRI the physiological changes against a changing background of altered pigments and structure, tracking more precisely the diurnal dynamics of the stomatal aperture. Simulations conducted, using leaf and canopy radiative transfer models to elucidate these results, showed that PRInorm is more linearly related to canopy pigment content than the standard PRI, and was more capable of differentiating between stress levels, providing better insight into the results of this diurnal study.

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Research paper thumbnail of Detecting water stress effects on fruit quality in orchards with time-series PRI airborne imagery

Remote Sensing of Environment, 2010

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Research paper thumbnail of School of Mathematical and Geospatial Sciences, RMIT University, Melbourne, Victoria, Australia

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Research paper thumbnail of Assessing structural effects on PRI for stress detection in conifer forests

... Rocío Hernández-Clemente a,⁎, Rafael M. Navarro-Cerrillo a, Lola Suárez b, Fermín Morales c, ... more ... Rocío Hernández-Clemente a,⁎, Rafael M. Navarro-Cerrillo a, Lola Suárez b, Fermín Morales c, Pablo J. Zarco-Tejada d a ETSIAM-Dpto. ... that PRI was correlated with DEPS, but was not related to other leaf pigments such as other carotenoids (Car) and chlorophyll a+b (Cab). ...

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Research paper thumbnail of Spectral Database Development for Australia

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Research paper thumbnail of Use of imaging spectroscopy to map vegetation hydraulic resistance in river floodplains

ABSTRACT This study aims at finding successful methods for mapping hydraulic resistance of vegeta... more ABSTRACT This study aims at finding successful methods for mapping hydraulic resistance of vegetation in a river floodplain using imaging spectroscopy and field data. The river discharge capacity is affected by the presence of different vegetation types and their ...

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Research paper thumbnail of Calibration final report

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Research paper thumbnail of MAUP and LiDAR derived canopy structure

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Research paper thumbnail of Spectral Information System for Australian Spectroscopy Data

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Research paper thumbnail of Searching for the Optimal Sampling Design for Measuring LAI in an Upland Rainforest

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Research paper thumbnail of Spectral information system development for Australia

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Research paper thumbnail of Key attributes for monitoring and assessment of Australian forests: a land management perspective

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Research paper thumbnail of The photochemical reflectance index (PRI) as a water stress indicator in peach orchards from remote sensing imagery

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Research paper thumbnail of A PRI-based water stress index combining structural and chlorophyll effects: Assessment using diurnal narrow-band airborne imagery and the CWSI thermal index

ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance In... more ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance Index (PRI) as an indicator of water stress, over a range of canopy structures and pigment content levels. Very high resolution (VHR) narrow-band multispectral (10 cm) and thermal (20 cm) imagery was acquired diurnally, in four airborne campaigns conducted over an experimental vineyard site undergoing three different irrigation treatments. Field measurements of leaf stomatal conductance (G(s)) and leaf water potential (Psi(leaf)) were acquired concurrently with the airborne campaigns and compared against the Crop Water Stress Index (CWSI), a widely accepted, thermal-based indicator of water stress, and against narrow-band multispectral indices calculated from pure-vegetation pixels. The study proposes a new formulation, a normalized PRI (PRInorm), in which the standard PRI index is normalized by an index that is sensitive to canopy structure (Renormalized Difference Vegetation Index, RDVI) and by a red edge index that is sensitive to chlorophyll content (R-700/R-670). The hypothesis investigated is that the new index, calculated as PRInorm = PRI/[RDVI center dot R-700/R-670], not only detects xanthophyll pigment changes as a function of water stress, but also normalizes for the chlorophyll content level and canopy leaf area reduction induced by stress. Results demonstrated that when comparing PRInorm against stomatal conductance (r(2) = 0.79; p <0.001) and leaf water potential (r(2) = 0.77; p < 0.001) measured at midday, the new index performed better than the standard PRI (r(2) = 0.52 and 0.49, respectively). Further, when using the four flights conducted during the diurnal experiment, the relationships with stomatal conductance also showed the superior performance of PRInorm (r(2) = 0.68) as opposed to PRI (r(2) = 0.4). The proposed normalized PRI was highly related (r(2) = 0.75; p <0.001) to the thermal indicator of water stress, CWSI, which was used here as a benchmark. In comparison, the standard PRI index was found to be significantly related to CWSI (p < 0.001), although the relationship was weaker (r(2) = 0.58) than that obtained for PRInorm. In summary, this study demonstrates that PRInorm isolated better than PRI the physiological changes against a changing background of altered pigments and structure, tracking more precisely the diurnal dynamics of the stomatal aperture. Simulations conducted, using leaf and canopy radiative transfer models to elucidate these results, showed that PRInorm is more linearly related to canopy pigment content than the standard PRI, and was more capable of differentiating between stress levels, providing better insight into the results of this diurnal study.

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Research paper thumbnail of Estimation of Biophysical Parameters in Mediterranean Conifer Forest Under Decline Condition by Using Ahs Airborne Data

earsel.org

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Research paper thumbnail of RESPONSE TO REGULATED DEFICIT IRRIGATION OF A NECTARINE ORCHARD IN SOUTHERN SPAIN

XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on CLIMWATER 2010: Horticultural Use of Water in a Changing Climate, 2011

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Research paper thumbnail of Field sampling protocol for foliage chemistry assessment: Applicability over varied forest sites in Australia

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Research paper thumbnail of Understanding the variability in ground-based methods for retrieving canopy openness, gap fraction, and leaf area index in diverse forest systems

Agricultural and Forest Meteorology, 2015

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Research paper thumbnail of RESPONSES TO REGULATED DEFICIT IRRIGATION OF A NECTARINE ORCHARD IN SOUTHERN SPAIN (S15. 215)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Almond tree canopy temperature reveals intra-crown variability that is water stress-dependent

Agricultural and Forest Meteorology, 2012

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Research paper thumbnail of A PRI-based water stress index combining structural and chlorophyll effects: Assessment using diurnal narrow-band airborne imagery and the CWSI thermal index

Remote Sensing of Environment, 2013

ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance In... more ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance Index (PRI) as an indicator of water stress, over a range of canopy structures and pigment content levels. Very high resolution (VHR) narrow-band multispectral (10 cm) and thermal (20 cm) imagery was acquired diurnally, in four airborne campaigns conducted over an experimental vineyard site undergoing three different irrigation treatments. Field measurements of leaf stomatal conductance (G(s)) and leaf water potential (Psi(leaf)) were acquired concurrently with the airborne campaigns and compared against the Crop Water Stress Index (CWSI), a widely accepted, thermal-based indicator of water stress, and against narrow-band multispectral indices calculated from pure-vegetation pixels. The study proposes a new formulation, a normalized PRI (PRInorm), in which the standard PRI index is normalized by an index that is sensitive to canopy structure (Renormalized Difference Vegetation Index, RDVI) and by a red edge index that is sensitive to chlorophyll content (R-700/R-670). The hypothesis investigated is that the new index, calculated as PRInorm = PRI/[RDVI center dot R-700/R-670], not only detects xanthophyll pigment changes as a function of water stress, but also normalizes for the chlorophyll content level and canopy leaf area reduction induced by stress. Results demonstrated that when comparing PRInorm against stomatal conductance (r(2) = 0.79; p <0.001) and leaf water potential (r(2) = 0.77; p < 0.001) measured at midday, the new index performed better than the standard PRI (r(2) = 0.52 and 0.49, respectively). Further, when using the four flights conducted during the diurnal experiment, the relationships with stomatal conductance also showed the superior performance of PRInorm (r(2) = 0.68) as opposed to PRI (r(2) = 0.4). The proposed normalized PRI was highly related (r(2) = 0.75; p <0.001) to the thermal indicator of water stress, CWSI, which was used here as a benchmark. In comparison, the standard PRI index was found to be significantly related to CWSI (p < 0.001), although the relationship was weaker (r(2) = 0.58) than that obtained for PRInorm. In summary, this study demonstrates that PRInorm isolated better than PRI the physiological changes against a changing background of altered pigments and structure, tracking more precisely the diurnal dynamics of the stomatal aperture. Simulations conducted, using leaf and canopy radiative transfer models to elucidate these results, showed that PRInorm is more linearly related to canopy pigment content than the standard PRI, and was more capable of differentiating between stress levels, providing better insight into the results of this diurnal study.

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Research paper thumbnail of Detecting water stress effects on fruit quality in orchards with time-series PRI airborne imagery

Remote Sensing of Environment, 2010

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Research paper thumbnail of School of Mathematical and Geospatial Sciences, RMIT University, Melbourne, Victoria, Australia

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Research paper thumbnail of Assessing structural effects on PRI for stress detection in conifer forests

... Rocío Hernández-Clemente a,⁎, Rafael M. Navarro-Cerrillo a, Lola Suárez b, Fermín Morales c, ... more ... Rocío Hernández-Clemente a,⁎, Rafael M. Navarro-Cerrillo a, Lola Suárez b, Fermín Morales c, Pablo J. Zarco-Tejada d a ETSIAM-Dpto. ... that PRI was correlated with DEPS, but was not related to other leaf pigments such as other carotenoids (Car) and chlorophyll a+b (Cab). ...

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Research paper thumbnail of Spectral Database Development for Australia

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Use of imaging spectroscopy to map vegetation hydraulic resistance in river floodplains

ABSTRACT This study aims at finding successful methods for mapping hydraulic resistance of vegeta... more ABSTRACT This study aims at finding successful methods for mapping hydraulic resistance of vegetation in a river floodplain using imaging spectroscopy and field data. The river discharge capacity is affected by the presence of different vegetation types and their ...

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Research paper thumbnail of Calibration final report

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Research paper thumbnail of MAUP and LiDAR derived canopy structure

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Research paper thumbnail of Spectral Information System for Australian Spectroscopy Data

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Research paper thumbnail of Searching for the Optimal Sampling Design for Measuring LAI in an Upland Rainforest

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Spectral information system development for Australia

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Key attributes for monitoring and assessment of Australian forests: a land management perspective

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The photochemical reflectance index (PRI) as a water stress indicator in peach orchards from remote sensing imagery

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A PRI-based water stress index combining structural and chlorophyll effects: Assessment using diurnal narrow-band airborne imagery and the CWSI thermal index

ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance In... more ABSTRACT This work advances the evaluation and interpretation of the Photochemical Reflectance Index (PRI) as an indicator of water stress, over a range of canopy structures and pigment content levels. Very high resolution (VHR) narrow-band multispectral (10 cm) and thermal (20 cm) imagery was acquired diurnally, in four airborne campaigns conducted over an experimental vineyard site undergoing three different irrigation treatments. Field measurements of leaf stomatal conductance (G(s)) and leaf water potential (Psi(leaf)) were acquired concurrently with the airborne campaigns and compared against the Crop Water Stress Index (CWSI), a widely accepted, thermal-based indicator of water stress, and against narrow-band multispectral indices calculated from pure-vegetation pixels. The study proposes a new formulation, a normalized PRI (PRInorm), in which the standard PRI index is normalized by an index that is sensitive to canopy structure (Renormalized Difference Vegetation Index, RDVI) and by a red edge index that is sensitive to chlorophyll content (R-700/R-670). The hypothesis investigated is that the new index, calculated as PRInorm = PRI/[RDVI center dot R-700/R-670], not only detects xanthophyll pigment changes as a function of water stress, but also normalizes for the chlorophyll content level and canopy leaf area reduction induced by stress. Results demonstrated that when comparing PRInorm against stomatal conductance (r(2) = 0.79; p <0.001) and leaf water potential (r(2) = 0.77; p < 0.001) measured at midday, the new index performed better than the standard PRI (r(2) = 0.52 and 0.49, respectively). Further, when using the four flights conducted during the diurnal experiment, the relationships with stomatal conductance also showed the superior performance of PRInorm (r(2) = 0.68) as opposed to PRI (r(2) = 0.4). The proposed normalized PRI was highly related (r(2) = 0.75; p <0.001) to the thermal indicator of water stress, CWSI, which was used here as a benchmark. In comparison, the standard PRI index was found to be significantly related to CWSI (p < 0.001), although the relationship was weaker (r(2) = 0.58) than that obtained for PRInorm. In summary, this study demonstrates that PRInorm isolated better than PRI the physiological changes against a changing background of altered pigments and structure, tracking more precisely the diurnal dynamics of the stomatal aperture. Simulations conducted, using leaf and canopy radiative transfer models to elucidate these results, showed that PRInorm is more linearly related to canopy pigment content than the standard PRI, and was more capable of differentiating between stress levels, providing better insight into the results of this diurnal study.

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