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Related Experiment Videos

Using nitrogen-15 to quantify vegetative buffer effectiveness for sequestering nitrogen in runoff.

A Bedard-Haughn1, K W Tate, C van Kessel

  • 1Department of Agronomy and Range Science, University of California, Davis, CA 95616, USA. bedardhaughn@ucdavis.edu

Journal of Environmental Quality
|November 13, 2004
PubMed
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Vegetative buffers help reduce nitrogen (N) runoff in pastures, but their effectiveness wanes over time. Managing buffer vegetation is key for sustained N sequestration and preventing nutrient release.

Area of Science:

  • Environmental Science
  • Agronomy
  • Soil Science

Background:

  • Vegetative buffers are crucial for mitigating nutrient runoff.
  • Previous research indicates buffers may release stored nutrients, acting as a source rather than a sink.
  • Understanding buffer efficiency in agricultural systems is vital for water quality management.

Purpose of the Study:

  • To quantify the nitrogen sequestration efficiency of vegetative buffers in an irrigated pasture.
  • To assess the impact of buffer width (8m and 16m) on nitrogen retention.
  • To evaluate the temporal dynamics of nitrogen (15N) attenuation and release from buffers.

Main Methods:

  • Utilized 98 atom % (15)N-labeled potassium nitrate (KNO3) applied at 5 kg ha(-1).
  • Compared nitrogen-15 (15N) runoff loads in 8-m buffers, 16-m buffers, and nonbuffered control plots.

Related Experiment Videos

  • Monitored nitrogen attenuation across different forms: nitrate (NO3-), ammonium (NH4+), and dissolved organic nitrogen (DON).

    • Main Results:

    • Buffered treatments showed significantly lower 15N loss compared to controls.
    • The 8-m buffer reduced nitrate-15N load by 28%, while the 16-m buffer reduced it by 42%.
    • Maximum buffer impact occurred within the first four weeks; subsequently, buffers released 15N, particularly nitrate and DON.

    Conclusions:

    • Vegetative buffers effectively attenuate nitrogen inputs, primarily through vegetative uptake.
    • Buffer width influences nitrogen retention, with wider buffers offering greater sequestration.
    • Sustainable nitrogen sequestration requires active management of buffer vegetation to maximize nutrient demand and retention, preventing nutrient release over time.