期刊
PHYSICS AND CHEMISTRY OF THE EARTH
卷 36, 期 9-11, 页码 475-478出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pce.2010.11.001
关键词
Wetland plant; Root oxygen release; Root plaque; Anoxic adaptation
资金
- National Major Science and Technology Project [2008ZX07101-006]
- Hi-Tech Research and Development Program of China [2003AA601020]
- Zhejiang Provincial Natural Science Foundation of China [R307153]
The capacity of root oxygen release by selected wetland plants pre-grown under both nutrient solution and artificial wastewater conditions were determined. The results indicated that the significant differences of root oxygen release by the tested wetland plants existed, and the biochemical process was the main source of root oxygen release as oxygen released by Vetiveria zizanioides L. Nash roots through biochemical process was contributed to 77% and 74% of total root oxygen release under nutrient solution conditions and artificial wastewater conditions, respectively, and that was 72% and 71% of total root oxygen release for Cyperus alternifolius L. It was found that the formation of root plaque with iron oxide was a function of root oxygen release as iron oxide concentration in root plaque was positively correlated to the potential of oxygen released by wetland plant roots with the regression coefficients as 0.874 *(p < 0.05) under nutrient solution conditions and 0.944 **(p < 0.01) under artificial wastewater conditions, which could be regarded as an important mechanism of wetland plants being tolerant to anoxia during wastewater treatment. It was suggested that the potential of root oxygen release could be used as a parameter for selecting wetland plants that can increase oxygen supply to soil or substrate of constructed wetlands and enhance nutrient transformation and removal, and V. zizanioides L. Nash with the highest potential of root oxygen release and higher tolerance to wastewater could be recommended to establish vegetated wetlands for treating nutrientrich wastewater such as domestic wastewater. (c) 2010 Elsevier Ltd. All rights reserved.
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