Abstract
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.
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Acknowledgments
This work was financially supported by the Major Projects on Control and Rectification of Water Body Pollution (2009ZX07106-001), the Science and Technology Support Projects on the National Environmental Monitoring and Information (2111101), and the Projects on Control and Rectification of Water Body Pollution-the Cross-Border Aquatic Environment Investigation and Policy Research (2039001001011).
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Highlights
Time series of DOC and DON during the bioassay experiment were investigated.
Bioavailability of DOC and DON was measured to understand the C and N cycles.
Identify the chemical composition was a major factor affecting its bioavailability.
Show low C/N molecules compounds may be preferentially utilized by microbes.
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Shi, J., Cui, H., Jia, L. et al. Bioavailability of riverine dissolved organic carbon and nitrogen in the Heilongjiang watershed of northeastern China. Environ Monit Assess 188, 113 (2016). https://doi.org/10.1007/s10661-016-5120-y
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DOI: https://doi.org/10.1007/s10661-016-5120-y