Insight into transformation of dissolved organic matter in the Heilongjiang River

文献类型： 外文期刊

第一作者： Shi, Jianhong

作者： Shi, Jianhong;Zhao, Yue;Wei, Zimin;Wu, Junqiu;Wei, Dan;Zhang, Duoying

作者机构：

关键词： Heilongjiang River; Dissolved organic matter; Components transformation; Parallel factor analysis; Generalized two-dimensional correlation spectroscopy; Two-dimensional hetero-spectral correlation spectroscopy

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2019 年 26 卷 4 期

页码：

收录情况： SCI

摘要： Heilongjiang is a browning river that receives substantial terrestrial organic matter, where reactivity of dissolved organic matter (DOM) may have important effect on ecosystem function and carbon biogeochemical cycle. However, little is known about microbial transformations of different DOM components, which could provide valuable insight into biogeochemical reactivity of DOM. In this study, bioavailability experiments were conducted for 55days to determine changes of different DOM components by microbial transformations. Labile matter (C1) was detected only in initial DOM, and tryptophan-like substances (C4) were observed from day 5 onwards. Thus, three individual components were identified at each sampling time of the bioavailability experiment. The increase of F-max in DOM components revealed that microbial humic-like substances (C2), terrestrial humic-like substances (C3), and C4 were produced by microbial transformation, especially in the spring samples. Further, two-dimensional correlation spectroscopy (2D-COS) indicated that shorter wavelength tryptophan-like and microbial humic-like substances can be degraded by microbes or transformed into longer wavelength complex substances. Relatively simple microbial humic-like substances were preferentially produced compared to complex terrestrial humic-like substances. The results make sense to understand the biogeochemical cycling and environmental effects of DOM in the Heilongjiang River.

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