IAHR Document Library

« Back to Library Homepage « Proceedings of the 40th IAHR World Congress (Vienna, 2023)

A New Method to Evaluate the Stress Intensity of Macrophytes

Author(s): Mizanur Rahman; Takashi Asaeda; Jonas Schoelynck

Linked Author(s): Takashi Asaeda

Keywords: Biotic stress monitoring; Hydrogen peroxide; Oxidative stress; Vegetation management; Ecohydraulics list a maximum of 5 keywords

Abstract: The physiological condition of aquatic plants, growth and survival rates, and colony formation are all affected by a biotic stresses in nature. However, in eco hydraulics, other factors than dynamic process often do not be considered in a flume experiment or field observation, as there is not any suitable method to identify other stressors effect quickly, except of a long term monitoring of growth rate of plants. Subject to environmental stresses, hydrogen peroxide (H2O2), a major reactive oxygen, is generated in the plant cell, associated with the stress intensity, and damages the plant. In the laboratory and field observation, several submerged species were sampled, then H2O2 contents were measured together with the major stress intensities, such as temperature, flow velocity, and light intensity, both in light-exposed and dark-adapted conditions. Then, the leaf H2O2 concentration of the plant was analyzed. The amount of H2O2 increases with increasing each stress intensity, and when multiple stresses are loaded the total stress is given by the sum of contributions of each stress. When the H2O2 concentration exceeds a threshold value, the plant deteriorates and finally dies out in several days. With this indicator, the effect of different types of stresses can be compared among others, and the tolerance of the plant is evaluated in a short period of time. This process is available to understand the unpredictable effects in eco hydraulics experiments


Year: 2023

Copyright © 2024 International Association for Hydro-Environment Engineering and Research. All rights reserved. | Terms and Conditions