In 2011 we established 99 soil pits across Windmill Valley in Sedgwick Reserve. All soil pits were used in Samuel Prentice's Master thesis, and the pits ranging from 1-11; 21-88; 99; are not active to this date (Nov 2018) and were already filled in. Pits# 12-20 (except #18); 89-98; are still active for chemical analysis only, and were already filled in. Pit#18 is still open and being actively sampled by Nina Bingham. These currently active pits are being used by Nina Bingham on their on-going research about rock derived nutrient cycling at the hillslope scale. Lin, Y., Prentice III, S.E., Tran, T., Bingham, N.L., King, J.Y. and Chadwick, O.A., 2016. Modeling deep soil properties on California grassland hillslopes using LiDAR digital elevation models. Geoderma regional, 7(1), pp.67-75.
Professor of landscape ecology and conservation planning, Bren School of Environmental Science and Management, UC Santa Barbara