期刊
WATER AND ENVIRONMENT JOURNAL
卷 26, 期 4, 页码 473-481出版社
WILEY
DOI: 10.1111/j.1747-6593.2011.00306.x
关键词
eutrophication; middle and lower reaches of Yangtze River region; mineralisable nitrogen; organic nitrogen fraction; sediment
资金
- National natural science foundation of China [40873079]
- Ministry of Science and Technology [2006FY110600]
The contents of different organic nitrogen (N) fractions, their contributions to total N (TN) and the relationship between their mineralisable N (MN) and different organic N fractions were investigated. Acid hydrophsable N (AHN) and nonhydrolysable N (NHN) accounted for 70.66 to 91.69% and 8.31 to 29.34% of TN. The AHN was the main organic N fraction, and its relative contribution to TN was higher than that in soil. So in terms of AHN contents and their contribution to TN, sediments are more hazardous than soils for lake eutrophication in the studied area. The ammonium N (AN), amino-acid N (AAN), amino-sugar N (ASN) and hydrolysable unidentified N (HUN) accounted for 30.51, 31.38, 6.42 and 31.69% of the total organic N, respectively. AN and AAN were the main sources of the MN in the studied sediments, which contributed to N release more than that of ASN and HUN.
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