Surface-soil attributes showing significant variation across treatments and/or sites.

Notes: Degrees of freedom in 2009 = 3,18 for treatment; 2,6 for site; and 6,18 for treatment*site. In 2010 and 2012, df = 1,6 and 2,6 for treatment and site, respectively, and 2,6 for treatment*site. Levels of treatment and site that do not share the same letter were significantly different in Tukey’s HSD post-hoc tests; the level with the highest mean is represented by letter A, the next highest by letter B, etc.