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. 2015 Feb 6;5:8280. doi: 10.1038/srep08280

Table 1. Regression results for mineral soil δ15N vs. climate. Inflection point for MAT in the breakpoint model was 9.83 ± 1.83 °C. r2 = 0.26 for the breakpoint model and 0.24 for the linear model. Units for MAP were mm before log-transformation.

  Estimate P
Breakpoint    
Intercept (‰) 7.71 ± 0.65 <0.001
MATCold (‰ °C−1) 0.03 ± 0.02 >0.1
MATHot (‰ °C−1) 0.18 ± 0.02 <0.001
log10 MAP (‰) −1.78 ± 0.24 <0.001
Average Depth (‰ cm−1) 0.08 ± 0.02 <0.001
Linear    
Intercept (‰) 8.31 ± 0.64 <0.001
MAT (‰ °C−1) 0.12 ± 0.01 <0.001
log10 MAP (‰) −2.10 ± 0.23 <0.001
Average Depth (‰ cm−1) 0.09 ± 0.02 <0.001