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| Decomposition of Aquatic Plants During Winter and Its Influence on Water Quality |
| Received:August 14, 2014 |
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| KeyWord:aquatic plants;decomposition;environmental factor;nutrients |
| Author Name | Affiliation | E-mail | | CAO Xun | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China | | | HAN Rui-ming | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China | | | ZHANG Ting-xi | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China | | | WANG Guo-xiang | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China | wangguoxiang@njnu.edu.cn | | WEI Hong-nong | Jiangsu Environmental Monitoring Center, Nanjing 210036, China | | | MA Yue | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China | | | JI Feng | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China | | | MA Jie | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China | |
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| Abstract: |
| In winter large proportion of aquatic plants die, decompose and then release nitrogen and phosphorous nutrients into water, which consequently impacts water quality. An indoor simulation experiment was carried out to study the decomposition process of three aquatic plants including Phragmites australis, Potamogeton malaianus and Limnanthemun nymphoides, typical in Lake Taihu, in winter and the subsequent influence on water quality. Phragmites australis, P. malaianus and L. nymphoides had a fast decomposition rate during the first 4 days but decomposed much slowly from day 5 to day 48 in terms of biomass loss. The dry matter of these three plants respectively decreased by 15.9%, 12.9% and 38.8% in 4 days. Significant differences were observed in the remained dry matter of three plants(P<0.01). The decomposition rate k was significantly negatively correlated with plant C/N and C/P(P<0.01, n=54). The pH and dissolved oxygen(DO) of the water body decreased rapidly during the first 4 days and increased slowly thereafter, and they were generally control > P. australis > P. malaianus > L. nymphoides. Total N levels reached the maximum value at the second day and TP attained the highest value at the fourth day. The influence of decomposition of aquatic plants on water quality was transient as no significant difference was observed in water quality parameters at the end of the experiment. |
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