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Title:   Author  item
                                            Godwin, Harryitem
                                            O Neill, Katherineitem
                                            Halvorson, Jonathanitem
                                            Gonzalez, Javier
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 12/20/2007
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: In our study of nutrient cycling within an Appalachian silvopasture system, one important pathway to consider was solute transfer in the form of precipitation.  Trees partition rainfall into throughfall and stemflow resulting in a spatial distribution under the tree.  Most collection methods for throughfall and stemflow result in a single sample for the entire rain event. Herein, we introduce a "synchronized, timed-event, measured, stemflow" (STEMS).  With this method, using a manifold and several individual collection vessels, the stemflow-event is divided into separate samples.  This allows for monitoring the total event in timed increments.  The advantage to this method is a better understanding of the chemical makeup of total precipitation volume as a factor of time.  This allows for improved analysis of how volume, duration, and time between events influence nutrient concentrations under the tree.  Initial results indicate significant increases in pH (e.g., control rain 4.8, rising to a stemflow pH of 7.0 in some tree species) and large differences in total organic carbon, tannin content, and nutrient levels between test and control samples.  These initial results suggest additional sampling will further increase our understanding of nutrient cycling within the silvopasture ecosystem.


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