Abstract
The seasonal and spatial changes in dissolved organic carbon (DOC) in Lake Kasumigaura, a shallow, eutrophic lake, were analyzed and the lability of DOC was tested by long-term incubations. There was a nearly 1 mgCl−1 downstream increase in refractory DOC in the lake; at the center it fluctuated little seasonally. The characteristic UV-absorbance: DOC ratios were determined for samples from the influent rivers (pedogenic: used interchangeably with “allochthonous”) and outdoor experimental ponds (autochthonous) during incubations. These ratios were then used to calculate the proportion of total measured lake water DOC in each of four components: pedogenic-refractory (PR), pedogenic-labile (PL), autochthonous-refractory (AR) and autochthonous-labile (AL). PR was uniform (around 1.5 mgCl−1) or diminished very slightly over time. AR increased from nearly zero at the station closest to an influent river to 1 mgCl−1 at the lake center. PL declined downstream from 0.3 mgCl−1 to zero. AL was virtually constant at 0.8 mgCl−1 except at the station closest to the influent river. The constancy of the UV-absorbance: DOC ratio during the biodegradation process was confirmed for Lake Kasumigaura; hence a two-component model (pedogenic-autochthonous) could be applied here without consideration of DOC lability. However, this assumption is not always met for other water bodies, and therefore it should be checked before applying a two-component model elsewhere.
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Fukushima, T., Park, Jc., Imai, A. et al. Dissolved organic carbon in a eutrophic lake; dynamics, biodegradability and origin. Aquatic Science 58, 139–157 (1996). https://doi.org/10.1007/BF00877112
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DOI: https://doi.org/10.1007/BF00877112