Effect of acid solutions on plants studied by the optical beam deflection method |
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| Authors: | Liangjiao Nie Mitsutoshi Kuboda Tomomi Inoue Xingzheng Wu |
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| Affiliation: | 1. Department of Geography, The University of Western Ontario, 1151 Richmond St. North, London, Ontario N6A 5C2, Canada;2. U.S. Geological Survey, Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523-1499, USA;3. Department of Watershed Sciences, Utah State University, 5210 Old Main Hill, Logan, UT 84322, USA;4. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523-1499, USA;5. Climate Change Institute, University of Maine, Orono, ME, USA;6. Centre for Teaching and Learning, The University of Western Ontario, 1151 Richmond St North, London, Ontario N6A 3K7, Canada;7. Department of Environmental Science and Policy, University of California, Davis, One Shields Ave, Davis, CA 95616-5270, USA;8. Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, ?eské Budějovice 370 05, Czech Republic;9. Department of Ecology, University of Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria;10. WasserCluster Lunz - Inter-University Center for Aquatic Ecosystem Research, Dr. Carl Kupelwieser Promenade 5, A-3293 Lunz am See, Austria;11. Center for Lakes and Reservoirs and Department of Environmental Science and Management, Portland State University, Portland, OR 97203, USA;12. Global Water Center and Biology Department, University of Nevada, 1664 N. Virginia St, Reno, NV 89557, USA;13. U.S. Geological Survey, Columbia Environmental Research Center, 4200 East New Haven Road, Columbia, MO 65201, USA;14. Department of Forest and Wildlife Ecology, University of Wisconsin, Madison, WI, USA;15. Paleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen''s University, 116 Barrie St., Kingston, Ontario K7L 3N6, Canada;p. Institute of Earth Sciences, University of Applied Sciences and Arts of Southern Switzerland, Canobbio CH-6952, Switzerland;q. US Geological Survey/INSTAAR, 4001 Discovery Drive, Boulder, CO 80303, USA;r. Department of Fish, Wildlife, and Conservation Biology, Colorado State University, 1474 Campus Delivery, Fort Collins, CO, USA;s. Bren School of Environmental Science and Management, University of California, Santa Barbara, CA, USA;1. Laboratoire écologie fonctionnelle et environnement, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France;2. Institut de Systématique, Évolution, Biodiversité, ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP50, 75005 Paris, France;3. Faculty of Biology, University of Gdańsk, ul. Wita Stwosza 59, 80-308 Gdańsk, Poland;4. University Paul Sabatier, LRSV, UMR CNRS 5546, Toulouse, France |
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| Abstract: | The optical beam deflection method was applied to study the effects of acid solution on both a terrestial and aquatic plants Egeria and Cerastium, which are common aquatic plant and terrestial weed respectively. A probe beam from a He-Ne laser was passed through a vicinity of a leaf of the plants, which were put in culture dishes filled with acid solutions. Deflection signals of the probe beam were monitored and compared for acid solutions with different pH values. The results of Egria showed that the deflection signals changed dramatically when pH values of acid solutions were 2.0 and 3.0, while little at pH of 4.0 and 5.0. For Cerastium when pH were below 3.0, deflection signals changed greatly with time at the begining. After a certain period of time, deflection signals changed little with time. When pH value was above 4.0, deflection signals of Cerastium were still changing with time even after 20 hours. The results suggested that the damage threshold of pH was between 3.0 and 4.0 for both the land and aquatic plants. |
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| Keywords: | acid rain plant optical beam deflection |
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