期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 20, 期 9, 页码 5922-5929出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-013-1860-1
关键词
Eisenia fetida; Photosynthetic characteristics; Nitrogen; Phosphorus; Wetland plants; Constructed wetland
资金
- National Natural Science Foundation of China [40901257]
- Jiangsu Key Laboratory of Agricultural Meteorology [KYQ1206, JKLAM2012 01]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
This study investigates biomass, density, photosynthetic activity, and accumulation of nitrogen (N) and phosphorus (P) in three wetland plants (Canna indica, Typha augustifolia, and Phragmites austrail) in response to the introduction of the earthworm Eisenia fetida into a constructed wetland. The removal efficiency of N and P in constructed wetlands were also investigated. Results showed that the photosynthetic rate (P-n), transpiration rate (T-r), and stomatal conductance (S-cond) of C. indica and P. austrail were (p < 0.05) significantly higher when earthworms were present. The addition of E. fetida increased the N uptake value by above-ground of C. indica, T. augustifolia, and P. australis by 185, 216, and 108 %, respectively; and its P uptake value increased by 300, 355, and 211 %, respectively. Earthworms could enhance photosynthetic activity, density, and biomass of wetland plants in constructed wetland, resulting in the higher N and P uptake. The addition of E. fetida into constructed wetland increased the removal efficiency of TN and TP by 10 and 7 %, respectively. The addition of earthworms into vertical flow constructed wetland increased the removal efficiency of TN and TP, which was related to higher photosynthetic activity and N and P uptake. The addition of earthworms into vertical flow constructed wetland and plant harvests could be the significantly sustainable N and P removal strategy.
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