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| Effects on root exudates of typical macrophytes operating in dry-wet alternation constructed wetlands under hexachlorobenzene stress |
| Received:August 23, 2016 |
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| KeyWord:hexachlorobenzene;dry-wet alternation;constructed wetlands;root exudates |
| Author Name | Affiliation | E-mail | | ZHANG Cui-ping | Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, China | | | WANG Bei | Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, China
Institute of Ecology and Geobotany, Yunnan University, Kunming 650091, China | | | LI Shu-ying | Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, China | | | LU Guo-li | Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, China | | | ZHU Chun-rong | Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, China | | | ZHOU Yuan-qing | Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, China | yqzhou@yxnu.net |
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| Abstract: |
| In order to understand water condition how to effect on root exudates of Phragmites australis(P. australis) and Typha angustifolia(T. angustifolia) in constructed wetland under HCB stress, we built the constructed wetland mesocosms to test the soil root exudates of typical plants in dry-wet alternation condition. The results showed that both of the P. australis and T. angustifolia had significantly rhizosphere effects(R/S>1), the contents of root exudates were:the rhizosphere > near the rhizosphere > far from the rhizosphere and moreover, the ratio of total suger, protein and amino acid contents was:2.9:3.9:3.3,however, rhizosphere effects of T. angustifolia were more obvious than P. australis. Water draining more significantly increased the root exudates of P. australis and T. angustifolia(P<0.05) than water flooding. This study indicated that the dry-wet alternation was more advantageous to promote the increased secretion both of P. australis and T. Angustifolia and the degradation of HCB than water draining and water flooding, could be in favor of creating a better rhizosphere environment, and then affect the removal efficiency of HCB in the wetland system. |
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