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Quantifying the Impact of Regular Cutting on Vegetative Buffer Efficacy for Nitrogen-15 Sequestration

^a Department of Plant Sciences, University of California, Davis, CA 95616
^b Current address: Department of Soil Science, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N 5A8, Canada

View larger version (27K): [in a new window]   Fig. 1. Schematic of pasture-buffer plot layout. Not to scale. "Biomass" buffers received no 15N and were used to get quantitative estimates of aboveground biomass. Soil samples were taken at the same downslope distances as the soil solution samples.

View larger version (17K): [in a new window]   Fig. 2. Atom % 15N excess in buffer vegetation by distance from 15N application (averages, standard error bars). From top to bottom, days after 15N application = 11 d, 60 d, 114 d. Note log y axis.

View larger version (21K): [in a new window]   Fig. 3. Vegetation biomass (g m–2) by time after 15N application for each of the three dominant species within the uncut buffers and for a composite of all species present per m2 within the cut buffers.

View larger version (20K): [in a new window]   Fig. 4. Total mass (mg) of 15N sequestered in aboveground vegetation within a given area by time after 15N application for 15N application zone, uncut buffer areas, and cut buffer areas, where 15N application zone and cut buffer areas are cumulative, including 15N removed by clipping during the irrigation season.

View larger version (49K): [in a new window]   Fig. 5. Soil microbial biomass 15N (µg 15N g–1 soil) by depth, distance from 15N application, and time after 15N application. Note log y axis.

View larger version (17K): [in a new window]   Fig. 6. Runoff 15N load over the course of the irrigation season. Values are averaged by buffer treatment and time; error bars represent standard error. Note log y axis.

View larger version (39K): [in a new window]   Fig. 7. Soil solution NO–3–15N concentrations by time and distance from 15N application. Values are averaged by buffer treatment, time, and distance; error bars represent standard error. Note log y axis.

View larger version (23K): [in a new window]   Fig. 8. Atom % 15N excess in soils by distance from 15N application at 3 d (top) and 114 d (bottom) after 15N application. Values are averaged by treatment and distance; error bars represent standard error.