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Physiological Reactions of Plants at CO<sub>2</sub> Emitting Mofettes and Thermal Effect of Emerging Gas - Probable Use for Remote Sensing

Pfanz, Hardy and Tank, Volker and Vodnik, Dominik (2005) Physiological Reactions of Plants at CO<sub>2</sub> Emitting Mofettes and Thermal Effect of Emerging Gas - Probable Use for Remote Sensing. Journal of Agricultural Meteorology, 60 (6), pp. 1189-1192. Society of Agricultural Meteorology of Japan..

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Abstract

Plants growing within mofette fields (CO2 emitting gas vents) show specific adaptations according to their extreme habitat. The closer they grow to the gas emitting vents and the higher the concentration of the escaping CO2 gas, the smaller the actual height and the total biomass of the plants. For some species a concomitant decrease in total chlorophyll was found. Additionally, photosynthesis as measured using CO2 gas-exchange and fluorescence clearly followed the same rule, being higher at the margins of the area and lower close to the vents. As fluorescence can be detected via remote sensors, chlorophyll fluorescence may be used to detect physiological changes from remote. In addition an abiotic thermal parameter may help in recognising mofettes in the field. As the flux of escaping CO2 gas from the soil may influence the soil temperature at and around the vent openings the application of infrared thermovision systems may be used additionally help to confirm their existence or detect unknown ones.The emerging gas dampens the temperature fluctuations of the soil imposed by the weather: it will cool the soil, when the gas is cooler than the undisturbed surface and it will warm the soil when the gas is warmer. Subtraction of multi-temporal IR images and setting temperature difference thresholds in difference images allows to disclose this effect and thus to detect the vents as well as their spatial extension.

Document Type:Article
Title:Physiological Reactions of Plants at CO<sub>2</sub> Emitting Mofettes and Thermal Effect of Emerging Gas - Probable Use for Remote Sensing
Authors:
AuthorsInstitution or Email of Authors
Pfanz, HardyInstitut für Angewandte Botanik, Universität Duisburg-Essen
Tank, VolkerUNSPECIFIED
Vodnik, DominikInstitute of Applied Botany, University of Ljubljana, Slovenia
Date:2005
Journal or Publication Title:Journal of Agricultural Meteorology
Refereed publication:Yes
In ISI Web of Science:No
Volume:60 (6)
Page Range:pp. 1189-1192
Publisher:Society of Agricultural Meteorology of Japan.
Status:Published
Keywords: CO2 springs, fluorescence, mofettes, photosynthesis, remote sensing, thermovision
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Dr.-Ing. Volker Tank
Deposited On:04 Dec 2007
Last Modified:27 Apr 2009 13:00

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