科研之友
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摘要
An extensive study was performed in boreal rivers across northern Ontario Canada, to examine the responses of dissolved organic matter (DOM) in rivers altered by hydroelectric waterpower operations. This was tested through three study components: a control-impact component comparing differences upstream and downstream of waterpower facilities (WPFs); a longitudinal component examining responses downstream; and a temporal component comparing the diurnal variations between two disparate rivers. Parallel factor analysis was used to examine how the inherent characteristics of the DOM pool changed between rivers. All rivers were located in heavily forested watersheds with low-level human land use. The main factor differentiating rivers was the presence or absence of WPFs. In a few instances, we identified larger relative differences in the nutrients moving downstream of the WPFs and some diurnal variation between an altered and reference river. However, the overall outcome from each study component was that the presence of WPFs had very little influence on DOM. We related these results to riverine hydrology, as well as a potential relationship between DOM and temperature. In the boreal forest of northern Ontario, catchment characteristics may exert the strongest influence on DOM composition.
- 出版日期2015-2
