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Changes in spectral reflectance of crop canopies due to drought stress.

Huber, Katja und Dorigo, Wouter und Bauer, T. und Eitzinger, S. und Haumann, J. und Kaiser, G. und Linke, R. und Postl, W. und Rischbeck, P. und Schneider, W. und Suppan, F. und Weihs, P. (2005) Changes in spectral reflectance of crop canopies due to drought stress. In: Proc. 11th SPIE International Symposium on remote Sensing. 11th SPIE International Symposium on remote Sensing, 2005-09-19 - 2005-09-22, Bruges.

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Kurzfassung

Remote sensing at optical wavelengths provides information on agricultural crop status, therefore being a useful tool for the detection and monitoring of drought stress in crop production. In the project “crop drought stress monitoring by remote sensing” (DROSMON) led by the University of Natural Resources and Applied Life Sciences in Vienna, which started in January 2005, remote sensing methods for drought stress classification were based on physical models of canopy reflectance using a combination of SAILH and PROSPECT. Spectral reflectance of maize and wheat were measured in situ using a field spectroradiometer FieldSpec Pro FR for different crop development stages and drought stress levels at a test site in Vienna, Austria. An extensive validation program was carried out measuring various physiological properties of the crops. A significant difference in reflectance was observed between the canopies experiencing distinct drought stress levels. The observed differences could be confirmed by model simulations based on the measured biophysical variables. These suggest that there will be a change in spectral reflectance in drought stressed crops, varying according to the different growth stages. This is most marked in the near (NIR) and mid (MIR) infrared wavelength region, probably due to modifications of leaf internal structure, variations in leaf inclination (e.g. due to wilting) and leaf area index. We present initial results from this research, which partly support these ideas. Further investigations are necessary.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Changes in spectral reflectance of crop canopies due to drought stress.
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Huber, KatjaBOKU
Dorigo, WouterNICHT SPEZIFIZIERT
Bauer, T.BOKU
Eitzinger, S.BOKU
Haumann, J.BOKU
Kaiser, G.BOKU
Linke, R.BOKU
Postl, W.BOKU
Rischbeck, P.BOKU
Schneider, W.BOKU
Suppan, F.BOKU
Weihs, P.BOKU
Datum:2005
Erschienen in:Proc. 11th SPIE International Symposium on remote Sensing
Referierte Publikation:Ja
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:canopy reflectance, drought stress, model inversion, PROSPECT, SAIL
Veranstaltungstitel:11th SPIE International Symposium on remote Sensing
Veranstaltungsort:Bruges
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2005-09-19 - 2005-09-22
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Umwelt und Sicherheit > Umwelt und Geoinformation
Hinterlegt von: Wouter Dorigo
Hinterlegt am:16 Aug 2006
Letzte Änderung:14 Jan 2010 23:09

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