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Linking physiological responses, chl...

Virginia Commonwealth University.

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Linking physiological responses, chlorophyll fluorescence and hyperspectral imagery to detect environmental stress in coastal plants.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Linking physiological responses, chlorophyll fluorescence and hyperspectral imagery to detect environmental stress in coastal plants./
作者:	Naumann, Julie C.
面頁冊數:	147 p.
附註:	Adviser: Donald R. Young.
Contained By:	Dissertation Abstracts International69-05B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3316860
ISBN:	9780549644323

Linking physiological responses, chlorophyll fluorescence and hyperspectral imagery to detect environmental stress in coastal plants.
Naumann, Julie C.

Linking physiological responses, chlorophyll fluorescence and hyperspectral imagery to detect environmental stress in coastal plants. - 147 p.

Adviser: Donald R. Young.

Thesis (Ph.D.)--Virginia Commonwealth University, 2008.

Environmental stresses may temporarily affect the photosynthetic apparatus, especially photosystem II (PSII) before irreversible morphological damage is apparent. Stress detection prior to visible damage could permit quick and accurate assessment of the physiological response to environmental stress at the landscape level, revealing spatial variation in the physiological status of plants and the environment. Non-invasive remote sensing techniques, such as chlorophyll fluorescence and plant reflectance, have been developed to monitor plant stress and photosynthetic status, and to detect and predict changes in the natural environment. The objective of this research was to investigate the effects of multiple environmental stressors on plant physiology using remote sensing detection in both laboratory and field experiments. Laboratory studies examining the effects of salinity and drought on physiology and chlorophyll in two coastal plants, Myrica cerifera and Phragmites australis revealed that xanthophyll-cycle dependent energy dissipation may be the underlying mechanism in protecting photosystem II from excess energy in these plants. Freshwater and saltwater flooding experiments showed that M. cerifera is able to survive short-term saltwater flooding by gradually closing stomata and dissipating excess light energy via the xanthophyll cycle without damage to PSII. The physiological reflectance index (PRI) was effective at tracking changes in fluorescence at the leaf-level scale in salinity flooded plants. Field experiments revealed that under conditions of drought, M. cerifera is able to effectively dissipate excess light and drought stress is not detectable via fluorescence or reflectance. However, salinity appeared to be a factor responsible for patterns of stress across the landscape, and was detectable using PRI from airborne hyperspectral imagery in the dominant woody vegetation on a Virginia barrier island. These findings have implications for monitoring the effects of climate change in coastal systems and suggest that PRI may be used for early identification of salt stress that may lead to changes in plant distributions at the landscape level as a result of rising sea-level and increased storm intensity.

ISBN: 9780549644323Subjects--Topical Terms:

1017726
Biology, Ecology.

Linking physiological responses, chlorophyll fluorescence and hyperspectral imagery to detect environmental stress in coastal plants.
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