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Antarctic moss stress assessment based on chlorophyll content and leaf density retrieved from imaging spectroscopy data

Journal Article


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Abstract


  • The health of several East Antarctic moss-beds is declining as liquid water availability is reduced due to recent environmental changes. Consequently, a noninvasive and spatially explicit method is needed to assess the vigour of mosses spread throughout rocky Antarctic landscapes. Here, we explore the possibility of using near-distance imaging spectroscopy for spatial assessment of moss-bed health.

    Turf chlorophyll a and b, water content and leaf density were selected as quantitative stress indicators. Reflectance of three dominant Antarctic mosses Bryum pseudotriquetrum, Ceratodon purpureus and Schistidium antarctici was measured during a drought-stress and recovery laboratory experiment and also with an imaging spectrometer outdoors on water-deficient (stressed) and well-watered (unstressed) moss test sites. The stress-indicating moss traits were derived from visible and near infrared turf reflectance using a nonlinear support vector regression.

    Laboratory estimates of chlorophyll content and leaf density were achieved with the lowest systematic/unsystematic root mean square errors of 38.0/235.2 nmol g−1 DW and 0.8/1.6 leaves mm−1, respectively. Subsequent combination of these indicators retrieved from field hyperspectral images produced small-scale maps indicating relative moss vigour.

    Once applied and validated on remotely sensed airborne spectral images, this methodology could provide quantitative maps suitable for long-term monitoring of Antarctic moss-bed health.

Publication Date


  • 2015

Citation


  • Malenovky, Z., Turnbull, J. D., Lucieer, A. & Robinson, S. A. (2015). Antarctic moss stress assessment based on chlorophyll content and leaf density retrieved from imaging spectroscopy data. New Phytologist, 208 (2), 608-624.

Scopus Eid


  • 2-s2.0-84942774813

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4217&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3194

Has Global Citation Frequency


Number Of Pages


  • 16

Start Page


  • 608

End Page


  • 624

Volume


  • 208

Issue


  • 2

Place Of Publication


  • United Kingdom

Abstract


  • The health of several East Antarctic moss-beds is declining as liquid water availability is reduced due to recent environmental changes. Consequently, a noninvasive and spatially explicit method is needed to assess the vigour of mosses spread throughout rocky Antarctic landscapes. Here, we explore the possibility of using near-distance imaging spectroscopy for spatial assessment of moss-bed health.

    Turf chlorophyll a and b, water content and leaf density were selected as quantitative stress indicators. Reflectance of three dominant Antarctic mosses Bryum pseudotriquetrum, Ceratodon purpureus and Schistidium antarctici was measured during a drought-stress and recovery laboratory experiment and also with an imaging spectrometer outdoors on water-deficient (stressed) and well-watered (unstressed) moss test sites. The stress-indicating moss traits were derived from visible and near infrared turf reflectance using a nonlinear support vector regression.

    Laboratory estimates of chlorophyll content and leaf density were achieved with the lowest systematic/unsystematic root mean square errors of 38.0/235.2 nmol g−1 DW and 0.8/1.6 leaves mm−1, respectively. Subsequent combination of these indicators retrieved from field hyperspectral images produced small-scale maps indicating relative moss vigour.

    Once applied and validated on remotely sensed airborne spectral images, this methodology could provide quantitative maps suitable for long-term monitoring of Antarctic moss-bed health.

Publication Date


  • 2015

Citation


  • Malenovky, Z., Turnbull, J. D., Lucieer, A. & Robinson, S. A. (2015). Antarctic moss stress assessment based on chlorophyll content and leaf density retrieved from imaging spectroscopy data. New Phytologist, 208 (2), 608-624.

Scopus Eid


  • 2-s2.0-84942774813

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4217&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3194

Has Global Citation Frequency


Number Of Pages


  • 16

Start Page


  • 608

End Page


  • 624

Volume


  • 208

Issue


  • 2

Place Of Publication


  • United Kingdom