Effect of macrophyte-driven transient storage on phosphorus uptake in spring coulee creek

Aquatic plants;Coulees;Water -- Phophorus content

Bohrman, KatherineStrauss, Eric ;

University of Wisconsin

关键词: Aquatic plants;    Coulees;    Water -- Phophorus content;   

Others  :  https://minds.wisconsin.edu/bitstream/handle/1793/76912/Bohrman_Katherine_Thesis.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: University of Wisconsin

【 摘 要 】

Investigations of phosphorus cycling and transport in streams lend insight into potential mechanisms of nutrient sequestration and can help mitigate human impact. In this study, we show a relationship between transient storage and phosphorus uptake in a cold-water stream in western Wisconsin. Hydrologic characteristics, nutrient spiraling metrics, macrophyte biomass, and geomorphological properties were quantified in seven reaches of Spring Coulee Creek. In each reach a solute transport model was used to estimate the median travel-time spent in transient storage, and uptake velocity was measured using pulsed additions of PO43- to the surface water. Stepwise linear regression was used to build models for transient storage and uptake velocity. Macrophyte biomass, stream bed slope, and riffle to pool ratio accounted for 99.6% of the variation in transient storage (P < 0.001). Transient storage, canopy cover, and slope accounted for 98.0% of the variation in uptake velocity (P = 0.002). This study shows that transient storage, primarily resulting from macrophyte beds, is positively correlated with phosphorus uptake but acknowledges the importance of other factors as well.