Table 1.

Elemental composition and molar ratios of the DOM in the original lake water (control), and in the algal- and soil-derived DOM immediately after their addition.

Treatment	TDP (μM)	DON (μM)	DOC (μM)	C : N (molar)	C : P (molar)
Control	0.05	6.15	57.4	9.35	1188
Algal	0.61	21.1	152.5	7.23	249
Soil	0.17	11.0	143.3	13.0	843

TDP, total dissolved phosphorus; DON, dissolved organic nitrogen. Please note that the C : P ratio is based on TDP concentrations that include a not determined fraction of inorganic phosphorus. Nutrient analyses were performed as described by Psenner (1989).