1. USING STABLE ISOTOPES TO DETERMINE SOURCES OF ERODED CARBON IN LOW-ORDER SIERRA NEVADA CATCHMENTS Emma McCorkle UC Merced

2. Progress  Sampled in P303 and B203 (soils, sediment, & litter)  6 transects, 3 positions (crest, backslope, deposition)  Run P303 samples for isotopic analysis ( δ 13 C & δ 15 N) B203 P303 Crest Backslope Deposition Stream

3. Results so far

4. Future  Sample the stream bank in both watersheds  Run the remaining samples for δ 13 C & δ 15 N  Run a subset for radiocarbon to find residence times  Lots of data analysis…