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Số người truy cập: 39,757,178

 Đánh giá tải trọng phosphorus trong hồ chứa Erie, Canada
Tác giả hoặc Nhóm tác giả:  Gerald Matisoff; Eliza Kaltenberg; Rebecca Steely; Stephanie Hummel; Jinyu Seo; Kenneth Gibbons; Thomas Bridgeman; Youngwoo Seo; Mohsen Behbahani; William James; Laura Johnson; Phuong Doan; Dittrich Maria; Mary Evans; Justin Chaffin.
Nơi đăng: Great Lakes Research Journal; Số: GLR-D-15-00129R2;Từ->đến trang: 1-61;Năm: 2016
Lĩnh vực: Môi trường; Loại: Bài báo khoa học; Thể loại: Quốc tế
This study applied eight techniques to obtain estimates of thediffusive flux of phosphorus (P) from bottom sediments throughout thewestern basin of Lake Erie. The flux was quantified from both aerobicand anaerobic incubations of whole cores; by monitoring the waterencapsulated in bottom chambers; from pore water concentration profilesmeasured with a phosphate microelectrode, a diffusive equilibrium in thinfilms (DET) hydrogel, and expressed pore waters; and from mass balanceand biogeochemical diagenetic models. Fluxes under aerobic conditions atsummertime temperatures averaged 1.35 mg P/m2/d and displayed spatialvariability on scales as small as a centimeter. Using two differenttemperature correction factors the flux was adjusted to mean annualtemperature yielding average annual fluxes of 0.43 - 0.91 mg P/m2/d and awestern basin-wide total of 378 - 808 Mg P/y as the diffusive flux fromsediments. This is 3 - 7% of the 11,000 Mg P/y International JointCommission (IJC) target load for phosphorus delivery to Lake Erie fromexternal sources. Using these average aerobic fluxes the sedimentcontributes 3.0 - 6.3 μg P/L as a background, internal contribution thatrepresents 20 - 42% of the IJC Target Concentration of 15 μg P/L for thewestern basin. The implication is that this internal diffusive recyclingof P is unlikely to trigger cyanobacterial blooms by itself, but issufficiently large to cause blooms when combined with external loads.This background flux may be also responsible for delayed response of thelake to any decrease in the external loading.
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