Estimating Vegetation Reference Conditions by Combining Historical Source Analysis and Soil Phytolith Analysis at Pepperwood Preserve,Northern California Coast Ranges,U.S.A
1. Division of Ecosystem Sciences, Department of Environmental Science, Policy, and Management, University of California, 137 Mulford Hall, , Berkeley, CA, 94720‐3114 U.S.A.;2. Sonoma Ecology Center, , Sonoma, CA, 95476‐5729 U.S.A.