Effect of broken dead culms of Phragmites australis on radial oxygen loss in relation to radiation and temperature |
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Authors: | Norio Tanaka Kentaro Yutani Thidar Aye K B S N Jinadasa |
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Institution: | (1) Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-shi, Saitama-ken 338-8570, Japan |
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Abstract: | The amount of oxygen released from the roots of Phragmites australis was quantified to examine the effects of airflow through dead culms, radiation, and temperature on radial oxygen loss (ROL).
To investigate the effect of dead culms on ROL quantitatively, the ROL of individual plants with open dead culms was compared
to that of plants with sealed dead culms as a function of light intensity and temperature. The relationship between ROL and
plant morphology (aboveground biomass, shoot diameter, shoot height) was investigated. When exposed to 300, 600, and 900 μmol
m−2 s−1 light, the ROL was 15.6, 22.5, and 30.9 μmol O2 g−1 dry root day−1, respectively, from plants with open dead culms and 11.0, 16.4, and 23.3 μmol O2 g−1 dry root day−1, respectively, from plants with sealed dead culms. The ROL from plants with open dead culms was obviously higher than that
from plants with sealed dead culms in every condition. The ROL from plants with open culms was 37% and 30% higher than that
from plants with sealed culms at 20°C and 30°C, respectively. The effects of plant-specific parameters such as leaf area and
shoot diameter on radial oxygen loss were evident. From the point of view of rhizosphere oxidation during the growing season,
the existence of open dead culms should be taken into consideration for optimal plant management in constructed wetlands.
This study provides a theoretical understanding of the effects of open dead culms, light conditions, and temperature on radial
oxygen loss.
Handling editor: S. M. Thomaz |
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Keywords: | Radial oxygen loss Phragmites australis Rhizosphere Light intensity Dead culm |
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