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6/06/2017 | 11:00 AM - 11:15 AM | Measuring uptake of organic and inorganic phosphorus using experimental streams | 306A

Measuring uptake of organic and inorganic phosphorus using experimental streams

Excess phosphorus (P) from surrounding agricultural land use degrades the quality of adjacent and downstream waterways. Most researchers measure P as soluble reactive phosphate (SRP) or total phosphorus (TP), but bioavailable P exists along the continuum between these, and in various forms (e.g., organic vs. inorganic P). Therefore, the relative importance of microorganisms for removing P from overlying water may be underestimated with current methods, especially in agricultural systems where P can be loosely sorbed to organic matter. To understand the relationship between form and function, we measured P uptake using short-term additions of inorganic potassium phosphate and organic reconstituted manure pellets in experimental low-P streams where we expect high biological demand. Uptake lengths (Sw) for the inorganic release were similar when calculated with SRP and TP (15m and 19m, respectively). Using the manure solution, Sw-SRP was an order of magnitude shorter than Sw-TP (59m and 1000m, respectively). We will explore these P uptake patterns further using a new yeast-based P measurement being developed to estimate bioavailable P in both the experimental streams at ND-LEEF and in the field in agricultural streams.

C31 Organic Matter Processing
C27 Landuse and Non-Point source Impacts
C10 Biogeochemistry

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Presenters/Authors

Matt Trentman (), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;