Distribution of nitrogen forms in surface sediments of lakes from different regions, China
- 517 Downloads
The characteristics of nitrogen fractions in the surface sediments of lakes from Eastern Plain Region, Yunnan-Guizhou Plateau Region, Northeast China Region, Qinghai-Tibet Plateau Region and Mongolia-Xinjiang Plateau Region were investigated and the differences of five lake regions on nitrogen fractionation were discussed. The results indicated that organic nitrogen (Norg) was the major nitrogen fraction accounting for 76.38–92.02 % of Ntot in sediments. The rank order of average Norg and Ntot of sediments in five lake regions was: Yunnan-Guizhou Plateau Region > Northeast China Region > Mongolia-Xinjiang Plateau Region > Qinghai-Tibet Plateau Region > Eastern Plain Region. The exchangeable nitrogen had a similar distribution as organic nitrogen in the studied sediments. NH4 +–N is the main exchangeable nitrogen of sediments in the studied lakes except in Lake Qinghai and Lake Yamdrok which contained higher nitrate concentrations than ammonium. Fixed ammonium (Nfix) in the sediments of studied lakes was irregularly distributed with the values ranging from 99.45 to 329.02 mg/kg. TOC was significantly and positively correlated with ammonium, nitrate, Norg and Ntot, while Nfix was negatively correlated with nitrate probably due to electrostatic attraction between Nfix and nitrate in layers of sediments.
KeywordsDistribution Nitrogen fraction Sediments Lake regions
This study is supported by the Mega-projects of Science Research for Water Environment Improvement (Program No. 2009ZX07106-001; 2012ZX07101-002), the National Natural Science Foundation of China (No. 40901248) and the China Basic Research Program (Program No. 2008CB418206).
- Chen XM, Zhu YC, Luo YQ, Fu XY (2012) Particular specific features of nitrogen distribution and their effect on alga growth in Qinghai Lake. J Saf Environ 12(2):119–123 (in Chinese)Google Scholar
- Hargreaves JA (1998) Nitrogen biogeochemistry of aquaculture ponds. Aquaculture 166:181–212Google Scholar
- Huo SL, Xi BD, Yu XJ, Su J, Zan FY, Zhao GC (2012) Application of equilibrium partitioning approach to derive sediment quality criteria for heavy metals in a shallow eutrophic lake, Lake Chaohu, China. Environ Earth Sci. doi: 10.1007/s12665-012-2056-6
- Lv XX, Song JM, Li XG, Yuan HM, Zhan TR, Li N, Gao XL (2005) Geochemical characteristics of nitrogen in the southern Yellow Sea surface sediments. J Mar Syst 56(1–2):17–27Google Scholar
- Wang SM, Dou HS (1998) Record of China Lakes. Science Press, Beijing (in chinese)Google Scholar
- Wang SR, Jiao LX, Jin XC, Liu JH (2008) Distribution of total exchangeable and fixed nitrogen in the sediments from shallow lakes in the middle and lower reaches of the Yangtze River. Acta Scientiae Circumstantiae 28(1):37–43 (in Chinese)Google Scholar
- Wu YH, Wang SM, Battarbee RW, Zhu YX (2004) Temporal and spatial distribution of chemical elements in small catchment and buffer function of wetland in Longganhu Lake China. Chin J Geochem 3(1):37–45Google Scholar
- Zhang SQ (2012) The eutrophication status and its development trend of water quality of Dahuofang reservoir in Liaoning Province. Heilongjiang Environ J 36(1):25–27 (in Chinese)Google Scholar