Progressive conversion of sediment mobile phosphorus to aluminum phosphorus

Figures & data

Figure 1. Station locations for coring sites in Green Lake, WA (from Dugopolski et al. 2008).

Table 1. Average depth weighted sediment concentrations of TP, Al-P, and mobile-P in the top 10 and 20 cm depths at the Index Station, Station A, Station B, and the Littoral Station in 1998 (7 years post-alum), 2004 (6 months post-alum), and 2015. Concentrations in (mg/g DW).

		TP		Al-P		Mobile-P
Year	Station	10 cm	20 cm	10 cm	20 cm	10 cm	20 cm
1998	Index	1.09	1.13	0.173	0.215	0.433	0.432
	A	1.01	0.97	0.179	0.181	0.317	0.299
2004	Index	1.73	1.59	0.649	0.481	0.092	0.206
	A	1.31	1.25	0.263	0.243	0.215	0.203
	B	1.19	1.18	0.291	0.245	0.023	0.044
	Littoral	1.08	1.15	0.313	0.307	0.071	0.112
2015	Index	1.73	1.80	0.842	0.882	0.020	0.022
	A	1.47	1.36	0.573	0.567	0.013	0.014
	B	1.56	1.50	0.588	0.592	0.015	0.016
	Littoral	1.40	1.24	0.399	0.402	0.014	0.016

Figure 2. Sediment aluminum-bound phosphorus at the Index Station and Station A, Green Lake, WA, in 1998, 2004 (6 months post-alum), and 2015.

Figure 3. Sediment mobile phosphorus (Fe-P and labile-P) at the Index Station and Station A in Green Lake, WA, in 1998, 2004 (6 months post-alum), and 2015.

Figure 4. Sediment total phosphorus at the Index Station and Station A in Green Lake, WA, in 1998, 2004 (6 months post-alum), and 2015.

Dugopolski RA, Rydin E, Brett MT. 2008. Short-term effects of a buffered alum treatment on Green Lake sediment phosphorus speciation. Lake Reserv Manage. 24:181–189.

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