Spatial distribution, fractions, and potential release of sediment phosphorus in the Hongfeng Reservoir, southwest China

Figures & data

Figure 1 Sampling positions in the Hongfeng Reservoir, southwestern China.

Figure 2 Spatial distribution of total P in the sediments from depths of (a) 0–5 cm, (b) 5–10 cm, (c) 10–20 cm, and (d) 20–30 cm in the Hongfeng Reservoir.

Figure 3 Vertical P fractions in the Taohuayuan River site, the outlet site, the Yangchang River site, and the fish-farming site in the Hongfeng Reservoir, southwestern China.

Figure 4 Correlation between P fraction concentrations in sediments of the Yangchang River (x-axis) and those in sediments of the outlet (y-axis), Hongfeng Reservoir. Correlation is significant at the 0.01 level.

Figure 5 Monthly changes in total P concentrations in the water of inflow rivers to Hongfeng Reservoir during the period January 2009 to December 2013 (data sources: Guiyang City Administration of Hongfeng, Baihua, and Aha Reservoirs).

Figure 6 DRP changes in the overlying and porewaters and P fraction changes in the sediments of (a) the outlet site and (b) the middle south lake region, Hongfeng Reservoir, in the simulation experiment.