274-4 The Nature and Potential Causes of Nutrient Hot Spots In a Sierra Nevada Forest Soil.



Tuesday, October 18, 2011: 1:45 PM
Henry Gonzalez Convention Center, Ballroom C-2, Ballroom Level

Dale Johnson1, Watkins Miller1, Benjamin Rau1 and Matthew Meadows2, (1)129 Fleishman Ag Bldg, Mail Stop 370, University of Nevada - Reno, Reno, NV
(2)Sierra Nevada Research Institute, University of California, Merced, Merced, CA
A study of soil nutrient hotspots was conducted by sampling two forest soils both destructively and with resin-based methods. In conjunction with the soil sampling, O horizon interflow collectors were established near each plot. Based on previous work, we hypothesized that nutrient hotspots existed in the soils and that they would be more common for less abundant than more abundant nutrients. We also hypothesized that nutrient-enriched O horizon interflow was occurring at these sites and could cause hotspots in where it enters the soil in preferential flow paths. The first hypothesis was only partially supported: hotspots, as indicated by significant positive skew and statistical outliers, occurred not only for least abundant nutrients, but for nearly all measured nutrients by various methods. The second hypothesis was supported: O horizon interflow did occur, was enriched in nutrients, and could well have caused some nutrient hotspots. We found one candidate for such a hotspot where extreme outliers for all but one H2O-extractable nutrient was identified.
See more from this Division: S07 Forest, Range & Wildland Soils
See more from this Session: Carbon and Nutrient Cycling