. 2019 Nov 7;14(11):e0224864. doi: 10.1371/journal.pone.0224864

Table 3. Linear model relationships between nitrification rates (μg N L^-1 d^-1) and NH₄⁺ concentrations (μg N L^-1), using the linear permutations modeling approach.

Literature data sources are noted in the caption of Fig 3.

Data usage	Linear model permutation	Model fit, significance, and degrees of freedom
All data (literature and this study)	Log(Nitrification rate+1) = 0.0012 × NH₄⁺-N +0.62	Adjusted R² = 0.47, P < 0.001, 20 DF
All data (literature and this study, excluding Pasqua Lake)	Log(Nitrification rate) = 0.0009 × NH₄⁺-N– 0.51	Adjusted R² = 0.06, P = 0.14, 19 DF
Only literature data	Log(Nitrification rate) = 0.0019 × NH₄⁺-N + 0.68	Adjusted R² = 0.70, P = 0.003, 7 DF

Table 3. Linear model relationships between nitrification rates (μg N L-1 d-1) and NH4+ concentrations (μg N L-1), using the linear permutations modeling approach.