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Effects of Nitrogen Deposition on an Arid Grassland in the Colorado Plateau Cold Desert

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Schwinning, Susanne, Starr, Benjamin I, Wojcik, Nathan J, Miller, Mark Eugene, Ehleringer, James R, and Sanford Jr, Robert L, Effects of Nitrogen Deposition on an Arid Grassland in the Colorado Plateau Cold Desert: .

Summary

Historically, ecosystems in the southwestern United States derived much of their nitrogen (N) from N-fixation in biological soil crusts. Today, these regions have highly reduced crust cover, and atmospheric deposition may be the dominant source of N. This study investigates the effects of increased nitrogen deposition on nitrogen uptake, photosynthesis, and growth of the two main forage grasses on the Colorado Plateau, galleta (Hilaria jamesii [Torr.] Benth.) and Indian ricegrass (Oryzopsis hymenoides, [Roemer & J.S. Schultes] Ricker ex Piper). Plots were fertilized for 2 years with 0, 10, 20, and 40 kg nitrogen ha?1 annually, up to 4� the estimated current annual deposition rate, in 2 applications per year (spring and summer). Half-plots [...]

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  • Upper Colorado River Basin

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From Source - Mendeley RIS Export <br> On - Wed Sep 19 08:03:42 MDT 2012

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Title Citation Effects of Nitrogen Deposition on an Arid Grassland in the Colorado Plateau Cold Desert

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