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- W1963548906 abstract "The impacts of a heavy storm of rain upon the dissolved and particulate organic matter (OM), nitrogen (N) and phosphorus (P) in the main river of the vegetation-rich Nagara River basin were investigated using water samples collected along the river line during a critical typhoon-induced heavy rain storm event. Besides, based on a high performance size-exclusion chromatography (HPSEC) system, the variance of dissolved OM (DOM) in its molecular weight (MW) characteristics was also assessed. From the MW standpoint, DOM components merged into the river along the river line resembled those present in its headwater. The MW range changed only slightly from 1010 to 5900 at the upstream (US), to 1130–5900 and 1200–5900 Da at the midstream (MS) and downstream (DS), respectively, while the corresponding weight-averaged MW (Mw) decreased from 3669 to 3330 and 2962 Da. The heavy storm of rain enhanced the content of DOM; however, apart from a small larger-MW fraction (about 5900–6800 Da), the newly emerged DOM constituents exhibited an MW range similar to those existed before the storm. Due also to the storm of rain, total P and N (TP and TN) changed markedly in the ranges of 6.6–11.9, 8.3–40.6 and 48.4–231.3 μg/l for TP, and 145.4–296.0, 502.2–1168.7 and 1342.7–1927.3 μg/l for TN at the US, MS and DS, respectively. The larger values of TP and TN generally appeared for samples at elevated river water levels. The enhanced presence of P was found largely attributed to its particulate form; while, for N, the contribution from its dissolved form was significant. The newly emerged suspended particles via the storm-water contained lower content of OM, N and P, and a general decreasing trend of the particulate OM, N and P along the river line was also confirmed. The C/N ratio in the dissolved form varied in 0.7–6.7 and decreased downstream, while, that in the particulate form 2.3–17.3. Suspended particles that emerged in the river water during the storm exhibited larger C/N values. N/P in both dissolved and particulate forms varied in the ranges of 2.2–17.1 and 12.9–444.9, respectively, and a general trend of either increasing or decreasing in relation to the storm of rain was not revealed." @default.
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- W1963548906 date "2005-06-01" @default.
- W1963548906 modified "2023-10-16" @default.
- W1963548906 title "Impacts of a heavy storm of rain upon dissolved and particulate organic C, N and P in the main river of a vegetation-rich basin area in Japan" @default.
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- W1963548906 doi "https://doi.org/10.1016/j.scitotenv.2004.11.004" @default.
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