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| Distribution of Nitrogen in Water, Soil and Sediment in Water/Land Ecotone of Returning Fishpond to Lake Area of Northern Gonghu Bay |
| Received:May 06, 2014 |
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| KeyWord:Gonghu Bay;returning fishpond to Lake Area;ecotone;water/sediment/soil;nitrogen;temporal and spatial distribution |
| Author Name | Affiliation | | LU Shao-yong | Chinese Research Academy of Environmental Sciences, Beijing 100012, China
School of Environmental Science and Engineering, Shandong University, Jinan 250100, China | | QU Jie-ting | Chinese Research Academy of Environmental Sciences, Beijing 100012, China
School of Environmental Science and Engineering, Shandong University, Jinan 250100, China | | XU Qiu-jin | School of Environmental Science and Engineering, Shandong University, Jinan 250100, China | | HU Xiao-zhen | School of Environmental Science and Engineering, Shandong University, Jinan 250100, China | | WANG Zu-mao | School of Environmental Science and Engineering, Shandong University, Jinan 250100, China | | ZHAO Wei-dian | Shandong Academy of Environmental Science, Jinan 250013, China |
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| Abstract: |
| Returning fishpond to lake is one of approaches to restore regional ecosystems. Understanding transformation and cycling of nutrients in the restored area is critical to implementation of such practice. Here, a water-land ecotone(2.18 km2) in returning fishpond to lake area of north Gonghu Bay of Lake Taihu was selected to examine the temporal and spatial variations of nitrogen in water, sediment, and soil. Seventeen sampling locations were chosen at the north and south zones. Water, sediment and soil samples were collected in November 2012 and May 2013. Total nitrogen and ammonia nitrogen in water, soil and sediment samples were lower in Spring than in Autumn, but nitrate nitrogen in soils was higher in Spring than in Autumn, showing a significant seasonal variation. Growing plants artificially had a great contribution to the removal of nitrogen. In addition, temperature and microbial activity would help improve nitrogen removal. In water-land ecotone, nitrification was greater in Spring than in Autumn. The spatial distribution of ammonia nitrogen was consistent with that of total nitrogen. The dominant form of nitrogen in water was ammonia nitrogen, however, organic nitrogen was the main form in the sediment and soil. |
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