Occurrence characteristics and release potential of nitrogen fractions in sediment of Lihu Lake
WANG Wen-wen1,2, WANG Shu-hang2, JIANG Xia2, ZHENG Bing-hui2, ZHAO Li2, CHEN Jun-yi2
1. College of Water Sciences, Beijing Normal University, Beijing 100875, China;
2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
To reveal the impacts of sediment nitrogen on overlying water of Lihu Lake, the spatial distribution characteristics of nitrogen species were studied by sequential extraction method, the impacts of potential bioavailable nitrogen on nitrogen release from sediment were identified by Fick's first diffusion law and correlation analysis. And the potential for mineralization of organic nitrogen and its main source were assessed by mineralization experiment in laboratory at the same time. Results showed that the mean value of w(TN) was 1417.97mg/kg, w(TN) in the east lake was significantly higher than the west. HN (hydrolysable nitrogen) was the main form for TN, and w(HTN) accouted for 66.5% of w(TN). Emission flux of NH4+-N ranged from 1.93 to 20.88mg/(m2·d), and was manly affected by F-NH4+-N (free ammonia nitrogen) and E-NH4+-N (exchangeable ammonia nitrogen). The average nitrogen mineralization potential was 248.55mg/kg. F-ON (free organic nitrogen) and AAN (amino acid nitrogen) are the biggest contributors to mineralization of organic nitrogen, and they can directly influence the capacity of sediment nitrogen release into overlying water.
Chen M S, Ding S M, Liu L, et al. Kinetics of phosphorus release from sediments and its relationship with iron speciation influenced by the mussel (Corbicula fluminea) bioturbation[J]. Science of The Total Environment, 2016,542,Part A:833-840.
Wang P D, Zhao L, Wang C, et al. Nitrogen distribution and potential mobility in sediments of three typical shallow urban lakes in China[J]. Environmental Engineering Science, 2009, 26(10):1511-1521.
Bremner J M. Organic forms of soil nitrogen[C]//Bremner J M, Black C A (cds). Methods of Soil Analysis. USA:Madison, American Society of Agronomy, 1965:1148-1178.
[13]
Stevenson F J. Organic forms of soil nitrogen[M]. Humus Chemistry, Wiley, New York, 1997:55-119.
[14]
姜霞,王书航.沉积物质量调查评估手册[M]. 北京:科学出版社, 2012.
[15]
Bolalek J, Graca B. Ammonium nitrogen at the water-sediment interface in Puck Bay (Baltic Sea)[J]. Estuarine Coastal and Shelf Science, 1996,43:767-779.
[16]
Billen G. A budget of nitrogen recycling in North Sea sediments off the Belgian coast[J]. Estuarine Coastal and Shelf Science, 1978,7:127-146.
Delange G J. Distribution of exchangeable, fixed, organic and total nitrogen in interbedded turbiditic pelagic sediments of the Madeira abyssal-plain, eastern north-Atlantic[J]. Marine Geology, 1992,109(1/2):95-114.
Stevenson F J. Humus chemistry:Genesis, composition, reactions[M]. New York:John Wiley & Sons, 1994:55-119.
[23]
Schulten H R. The three-dimensional structure of humic substances and soil organic matter studied by computational analytical chemistry[J]. Fresenius Journal of Analytical Chemistry, 1995,351(1):62-73.
[24]
Sowden F J, Chen Y, Schnitzer M. The nitrogen distribution in soils formed under widely differing climatic conditions[J]. Geochim Cosmochim Acta, 1997,41:1524-1526.
[25]
Sulce S, Palma L D, Jaquin F,et al. Study of immobilization and remobilization of nitrogen fertilizer in cultivated soils by hydrolytic fractionation[J]. European Journal of Soil Science, 1996,47:249-255.
[26]
Qiu H M, Geng J J, Ren H Q, et al. Phosphite flux at the sediment-water interface in northern Lake Taihu[J]. Science of the Total Environment, 2016,543, Part A:67-74.
[27]
Kalkhoff S J, Hubbard L E, Tomer M D, et al. Effect of variable annual precipitation and nutrient input on nitrogen and phosphorus transport from two Midwestern agricultural watersheds[J]. Science of the Total Environment, 2016,559:53-62.
[28]
Mayer T, Ptacek C, Zanini L. Sediments as a source of nutrients to hypereutrophic marshes of Point Pelee, Ontario, Canada[J]. Water Research, 1999,33(6):1460-1470.
[29]
Li Q M, Zhang W, Wang X X, et al. Phosphorus in Interstitial Water Induced by Redox Potential in Sediment of Dianchi Lake, China[J]. Pedosphere, 2007,17(6):739-746.
[30]
Geurts J J M, Smolders A J P, Banach A M, et al. The interaction between decomposition, net N and P mineralization and their mobilization to the surface water in fens[J]. Water Research, 2010,44(11):3487-3495.
[31]
Stanford G, Smith S L. Nitrogen mineralization potentials of soils[J]. Soil Science Society of America Journal, 1972,36:465-470.
