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Using Nitrogen-15 to Quantify Vegetative Buffer Effectiveness for Sequestering Nitrogen in Runoff

Department of Agronomy and Range Science, University of California, Davis, CA 95616

View larger version (24K): [in a new window]   Fig. 1. Schematic of plot design (not to scale). Collection troughs installed at the bottom of each treatment (downslope of solution samplers).

View larger version (31K): [in a new window]   Fig. 2. The 15N concentrations within and between irrigations. Values are averaged by buffer treatment and time; error bars represent standard errors. Note log y axis.

View larger version (18K): [in a new window]   Fig. 3. The 15N load over the course of the summer. Values are averaged by buffer treatment and time; error bars represent standard errors. Note log y axis.

View larger version (28K): [in a new window]   Fig. 4. Atom % 15N excess in vegetation by distance. Values are averaged by time and distance across all treatments; error bars represent standard errors. Data from the 15N application zone not shown here due to graphical limitations.

View larger version (18K): [in a new window]   Fig. 5. Atom % 15N excess in soils by time. Values are averaged by time and distance across all treatments; error bars represent standard errors. Eight- and 16-m data only available for Day 86.