Presence and Behavior of Colloidal Nitrogen and Phosphorus in a Sierra Nevada Watershed Soil
1996
Rhea, S. A. | Miller, W. W. | Blank, R. R. | Palmquist, D. E.
Soil colloids can play a significant role in the profile migration of organic and inorganic nutrient species. We investigated the presence of colloidal N and P in a Lake Tahoe basin ecosystem following 6 yr of drought. Artificial rainfall was used to determine the release and mobility of colloidal N and P in soils of the Incline Creek, Nevada, watershed. Colloidal, rather than inorganic nutrient species, were the dominant forms present in soil water extracts. Concentrations of colloidal N increased following rainfall simulation, whereas concentrations of colloidal P decreased, and both appeared to be influenced by the presence and dissolution of hydrophobic organic coatings. Colloidal N and P must be considered a potential source of mobile nutrients in soils of the Sierra Nevada. A contribution of the Nevada Agric. Exp. Stn., the Robert M. Lee Foundation, and the Hydrology/Hydrogeology Program, College of Agric., Univ. of Nevada, Reno.
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