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Presence and Behavior of Colloidal Nitrogen and Phosphorus in a Sierra Nevada Watershed Soil

Wetlands Hydrologist, SRI/SHAPIRO, Portland, OR;

W. W. Miller^*

Dep. of Environ, and Resour. Sci., Univ. of Nevada, Reno NV 89512;

R. R. Blank and D. E. Palmquist

USDA-ARS, Univ. of Nevada, Reno, NV 89512.

^* Corresponding author (wilymalr{at}ers.unv.edu).

ABSTRACT

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.

Received for publication January 3, 1996.