Soil bulk density and total carbon and nitrogen contents for chronosequence experimental plots collected in 1980 and 2009 at the University of Michigan Biological Station. In situ study of decadal (1980 and 2009) losses of natural fire-Black Carbon in a temperate forest soil. In this field study, temperate forest soils were collected ~ 30 years apart from a plot that has remained unmanaged since the entire area was exposed to intense logging and burning until approximately 1911. The field site is part of a set of permanent experimental plots that has developed into a 100-year fire chronosequence. The soil in this experimental plot is a deep, sandy and excessively-drained spodosol.