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| The risk and control division of endogenous nitrogen release in Dianchi Lake sediment |
| WANG Miao1,2,3,4, WANG Sheng-rui1,2,4, JIAO Li-xin1,2,4, WANG Ben-yang3, YAN Hong3, LIU Wen-bin1,2,4 |
1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3. School of Environment and Chemical Engineering, Dalian University, Dalian 116622, China;
4. Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Kunming 650504, China |
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Abstract The waterlogged incubation method was used to test the content of the released nitrogen (EN), the potential released nitrogen (MN) and the steady nitrogen (FN) of the Dianchi Lake 20cm sediment, and the analysis of its spatial distribution, combined with the sediment dating data to calculate the amount of the different burial nitrogen forms. The nitrogen pollution of the sediment in Dianchi Lake was zoned based on the sediment-water interface nitrogen fluxes, and the amount of the burial EN and MN. The nitrogen release risk of the different regions of Dianchi Lake sediments was also evaluated, and their pollution control measures for different zones were also proposed. The results show,the risk order of nitrogen release of the different zones of Dianchi Lake sediments was South of Waihai >northern of Waihai >central of Waihai >Caohai, and the potential risk order was South of Waihai >central of Waihai >Caohai >northern of Waihai; there is a tendency of the nitrogen pollution of the Dianchi Lake sediment to transfer from north to south; the amounts of the 20cm sediment accumulation were TN 5757.90t, EN 637.72t, MN 1320.76t and FN 3799.42t for the whole lake. The nitrogen pollution of Dianchi sediment can be divided into four levels of high pollution area; medium pollution area, low pollution area and safety zone, which were 13.51%, 15.02%, 46.06%, and 25.42% of the whole lake, respectively. High pollution areas were mainly distributed in Caohai and Northern near Panlong river; medium pollution area were mainly distributed in high pollution below from Baoxiang river to Guanyin mountain region and a small area of Dianchi Lake outlet Haikou; low pollution area were mainly distributed in medium pollution below from Guangpudagou river to all of the southern of Waihai region. The sediment in high pollution area should be taken the environmental dredged and restoration technology; the medium pollution area should be take the safety and the high-level in situ control technology; for the low pollution area, the natural cover and aquatic plant restoration technology should be used.
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Received: 21 June 2015
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