. Author manuscript; available in PMC: 2018 Nov 28.

Published in final edited form as: Mar Freshw Res. 2017;68(12):2253–2265. doi: 10.1071/MF16372

Table 1. Reference-site soil characteristics (mean ± s.d.) by Omernik (1987) ecoregion.

Values within a row followed by the same letter do not differ from one another at P = 0.05

Variable	Erie Drift Plain (n = 12)	Middle Atlantic Coastal Plain (n = 6)	Southern Coastal Plain (n = 12)
Bulk density (g cm⁻³)	0.41 ± 0.25a	0.89 ± 0.20b	0.37 ± 0.25a
Total phosphorus (mg Pg⁻¹ soil)	0.631 ± 0.484a	0.046 ± 0.024b	0.272 ± 0.208b
Percentage nitrogen	1.2 ± 0.5b	0.4 ± 0.2a	1.4 ± 0.8b
Percentage organic carbon	14.5 ± 7.8b	4.3 ± 2.8a	18.7 ± 9.3b