Hyperspectral VNIR-spectroscopy and imagery as a tool for monitoring herbicide damage in wilding conifers

Rebecca C. Scholten, Joachim Hill, Willy Werner, Henning Buddenbaum, Jonathan P. Dash, Mireia Gomez Gallego, Carol A. Rolando, Grant D. Pearse, Robin Hartley, Honey Jane Estarija, Michael S. Watt

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Wilding conifers, the naturally regenerated scions of exotic conifer species, are a major ecological and economic issue in New Zealand. Hyperspectral imagery could provide a useful means of monitoring the efficacy of wilding control measures but little research has examined this possibility. Data were collected from an experiment, that included thirty-nine young Pinus contorta (Douglas) trees allocated to a control and two herbicide treatments (triclopyr butoxyethyl ester and diquat dibromide monohydrate). The objectives of this research were to examine the temporal impacts of herbicide on needle discolouration, spectral properties and tree physiology and to develop models to predict photosynthetic parameters from hyperspectral data. In accordance with obvious discolouration on the first day after treatment, values of net photosynthesis rate (A), electron transport rate (ETR), stomatal conductance (G) and optimal quantum yield of photosystem II (Fv/Fm) declined rapidly for plants treated with diquat. Discolouration following application of triclopyr was not evident before the second week, and values of A, ETR, G and Fv/Fm declined slower than those of diquat. Of the tested narrow-band spectral indices calculated from needle spectra photochemical reflectance index (PRI) exhibited the strongest correlation with the four photosynthetic parameters and R2 values between PRI and A, Fv/Fm, ETR and G were, respectively, 0.53, 0.46, 0.68 and 0.29. Models that used raw spectra as inputs showed that sparse partial least squares (SPLS) outperformed the three other approaches tested (PLS, Support Vector Machines, Elastic Net) and R2 values using this approach for A, Fv/Fm, ETR and G were, respectively, 0.64, 0.62, 0.65 and 0.42.

Original languageEnglish
JournalBiological Invasions
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

diquat
electron transfer
conifers
coniferous tree
herbicide
spectroscopy
imagery
herbicides
discoloration
triclopyr
damage
monitoring
electron
reflectance
hyperspectral imagery
tree physiology
Pinus contorta
scions
photosystem II
stomatal conductance

Keywords

  • Herbicides
  • Hyperspectral
  • Invasion ecology
  • Lodgepole pine
  • Stress detection
  • Wildings

Cite this

Scholten, Rebecca C. ; Hill, Joachim ; Werner, Willy ; Buddenbaum, Henning ; Dash, Jonathan P. ; Gomez Gallego, Mireia ; Rolando, Carol A. ; Pearse, Grant D. ; Hartley, Robin ; Estarija, Honey Jane ; Watt, Michael S. / Hyperspectral VNIR-spectroscopy and imagery as a tool for monitoring herbicide damage in wilding conifers. In: Biological Invasions. 2019.
@article{b8fce343b86742e39ee60c385da36749,
title = "Hyperspectral VNIR-spectroscopy and imagery as a tool for monitoring herbicide damage in wilding conifers",
abstract = "Wilding conifers, the naturally regenerated scions of exotic conifer species, are a major ecological and economic issue in New Zealand. Hyperspectral imagery could provide a useful means of monitoring the efficacy of wilding control measures but little research has examined this possibility. Data were collected from an experiment, that included thirty-nine young Pinus contorta (Douglas) trees allocated to a control and two herbicide treatments (triclopyr butoxyethyl ester and diquat dibromide monohydrate). The objectives of this research were to examine the temporal impacts of herbicide on needle discolouration, spectral properties and tree physiology and to develop models to predict photosynthetic parameters from hyperspectral data. In accordance with obvious discolouration on the first day after treatment, values of net photosynthesis rate (A), electron transport rate (ETR), stomatal conductance (G) and optimal quantum yield of photosystem II (Fv/Fm) declined rapidly for plants treated with diquat. Discolouration following application of triclopyr was not evident before the second week, and values of A, ETR, G and Fv/Fm declined slower than those of diquat. Of the tested narrow-band spectral indices calculated from needle spectra photochemical reflectance index (PRI) exhibited the strongest correlation with the four photosynthetic parameters and R2 values between PRI and A, Fv/Fm, ETR and G were, respectively, 0.53, 0.46, 0.68 and 0.29. Models that used raw spectra as inputs showed that sparse partial least squares (SPLS) outperformed the three other approaches tested (PLS, Support Vector Machines, Elastic Net) and R2 values using this approach for A, Fv/Fm, ETR and G were, respectively, 0.64, 0.62, 0.65 and 0.42.",
keywords = "Herbicides, Hyperspectral, Invasion ecology, Lodgepole pine, Stress detection, Wildings",
author = "Scholten, {Rebecca C.} and Joachim Hill and Willy Werner and Henning Buddenbaum and Dash, {Jonathan P.} and {Gomez Gallego}, Mireia and Rolando, {Carol A.} and Pearse, {Grant D.} and Robin Hartley and Estarija, {Honey Jane} and Watt, {Michael S.}",
year = "2019",
month = "1",
day = "1",
doi = "10.1007/s10530-019-02055-0",
language = "English",
journal = "Biological Invasions",
issn = "1387-3547",
publisher = "Springer Netherlands",

}

Scholten, RC, Hill, J, Werner, W, Buddenbaum, H, Dash, JP, Gomez Gallego, M, Rolando, CA, Pearse, GD, Hartley, R, Estarija, HJ & Watt, MS 2019, 'Hyperspectral VNIR-spectroscopy and imagery as a tool for monitoring herbicide damage in wilding conifers' Biological Invasions. https://doi.org/10.1007/s10530-019-02055-0

Hyperspectral VNIR-spectroscopy and imagery as a tool for monitoring herbicide damage in wilding conifers. / Scholten, Rebecca C.; Hill, Joachim; Werner, Willy; Buddenbaum, Henning; Dash, Jonathan P.; Gomez Gallego, Mireia; Rolando, Carol A.; Pearse, Grant D.; Hartley, Robin; Estarija, Honey Jane; Watt, Michael S.

In: Biological Invasions, 01.01.2019.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Hyperspectral VNIR-spectroscopy and imagery as a tool for monitoring herbicide damage in wilding conifers

AU - Scholten, Rebecca C.

AU - Hill, Joachim

AU - Werner, Willy

AU - Buddenbaum, Henning

AU - Dash, Jonathan P.

AU - Gomez Gallego, Mireia

AU - Rolando, Carol A.

AU - Pearse, Grant D.

AU - Hartley, Robin

AU - Estarija, Honey Jane

AU - Watt, Michael S.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Wilding conifers, the naturally regenerated scions of exotic conifer species, are a major ecological and economic issue in New Zealand. Hyperspectral imagery could provide a useful means of monitoring the efficacy of wilding control measures but little research has examined this possibility. Data were collected from an experiment, that included thirty-nine young Pinus contorta (Douglas) trees allocated to a control and two herbicide treatments (triclopyr butoxyethyl ester and diquat dibromide monohydrate). The objectives of this research were to examine the temporal impacts of herbicide on needle discolouration, spectral properties and tree physiology and to develop models to predict photosynthetic parameters from hyperspectral data. In accordance with obvious discolouration on the first day after treatment, values of net photosynthesis rate (A), electron transport rate (ETR), stomatal conductance (G) and optimal quantum yield of photosystem II (Fv/Fm) declined rapidly for plants treated with diquat. Discolouration following application of triclopyr was not evident before the second week, and values of A, ETR, G and Fv/Fm declined slower than those of diquat. Of the tested narrow-band spectral indices calculated from needle spectra photochemical reflectance index (PRI) exhibited the strongest correlation with the four photosynthetic parameters and R2 values between PRI and A, Fv/Fm, ETR and G were, respectively, 0.53, 0.46, 0.68 and 0.29. Models that used raw spectra as inputs showed that sparse partial least squares (SPLS) outperformed the three other approaches tested (PLS, Support Vector Machines, Elastic Net) and R2 values using this approach for A, Fv/Fm, ETR and G were, respectively, 0.64, 0.62, 0.65 and 0.42.

AB - Wilding conifers, the naturally regenerated scions of exotic conifer species, are a major ecological and economic issue in New Zealand. Hyperspectral imagery could provide a useful means of monitoring the efficacy of wilding control measures but little research has examined this possibility. Data were collected from an experiment, that included thirty-nine young Pinus contorta (Douglas) trees allocated to a control and two herbicide treatments (triclopyr butoxyethyl ester and diquat dibromide monohydrate). The objectives of this research were to examine the temporal impacts of herbicide on needle discolouration, spectral properties and tree physiology and to develop models to predict photosynthetic parameters from hyperspectral data. In accordance with obvious discolouration on the first day after treatment, values of net photosynthesis rate (A), electron transport rate (ETR), stomatal conductance (G) and optimal quantum yield of photosystem II (Fv/Fm) declined rapidly for plants treated with diquat. Discolouration following application of triclopyr was not evident before the second week, and values of A, ETR, G and Fv/Fm declined slower than those of diquat. Of the tested narrow-band spectral indices calculated from needle spectra photochemical reflectance index (PRI) exhibited the strongest correlation with the four photosynthetic parameters and R2 values between PRI and A, Fv/Fm, ETR and G were, respectively, 0.53, 0.46, 0.68 and 0.29. Models that used raw spectra as inputs showed that sparse partial least squares (SPLS) outperformed the three other approaches tested (PLS, Support Vector Machines, Elastic Net) and R2 values using this approach for A, Fv/Fm, ETR and G were, respectively, 0.64, 0.62, 0.65 and 0.42.

KW - Herbicides

KW - Hyperspectral

KW - Invasion ecology

KW - Lodgepole pine

KW - Stress detection

KW - Wildings

UR - http://www.scopus.com/inward/record.url?scp=85068892472&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068892472&partnerID=8YFLogxK

U2 - 10.1007/s10530-019-02055-0

DO - 10.1007/s10530-019-02055-0

M3 - Article

JO - Biological Invasions

JF - Biological Invasions

SN - 1387-3547

ER -