Bioavailability of riverine dissolved organic carbon and nitrogen in the Heilongjiang watershed of northeastern China

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• 作者：Jianhong Shi ; Hongyang Cui ; Liming Jia…
• 关键词：Heilongjiang watershed ; Dissolved organic carbon (DOC) ; Dissolved organic nitrogen (DON) ; Bioavailability ; Aromaticity
• 刊名：Environmental Monitoring and Assessment
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：188
• 期：2
• 全文大小：711 KB
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• 作者单位：Jianhong Shi (1)
  Hongyang Cui (1)
  Liming Jia (2)
  Linlin Qiu (1)
  Yue Zhao (1)
  Zimin Wei (1) (3)
  Junqiu Wu (1)
  Xin Wen (1)
  
  1. College of Life Science, Northeast Agricultural University, Harbin, 150030, China
  2. Heilongjiang Province Environmental Monitoring Centre, Harbin, 150056, China
  3. No. 59, Mucai Street, Xiangfang District, Harbin, 150030, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-2959

文摘

The bioavailabilities of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) were examined in eight sampling stations of the Heilongjiang watershed, located in Heilongjiang Province, northeast China. Water samples were incubated for 55 days at 20 °C, and the decreases in the DOC and DON concentrations were measured during the laboratory incubations. The experiments showed that bioavailable DOC (BDOC) accounted for 15–30 % of DOC and bioavailable DON (BDON) accounted for 29–57 % of DON. DOM bioavailability was higher for DON compared to DOC, suggesting that DON was more bioavailable and had a faster turnover than DOC in the Heilongjiang watershed. Furthermore, the percent of bioavailable DOC (%BDOC) was significantly related to SUVA₂₅₄, not the DOC concentration, suggesting that the chemistry composition of DOM played a more important role in affecting its bioavailability compared to the DOM concentration. In addition, significant negative correlations were observed between the initial DOC/DON ratios and the percent of bioavailable DOM fractions (%BDOC and %BDON), especially for %BDON, implying that low C/N molecules or N-rich compounds may be preferentially utilized by microbes.