Ecological Archives E093-084-A3
G. Darrel Jenerette and Amitava Chatterjee. 2012. Soil metabolic pulses: water, substrate, and biological regulation. Ecology 93:959–966.
Appendix C (Table C1). Statistical models for control, water pulse, and substrate addition response presented in Figs. 1–3.
|
Relationship (corresponding figure) |
Model | AIC |
β1 (95% CI) |
β2 (95% CI) |
RMSE | R2 |
|
Summer control vs. elevation (1A)* |
y = β1exβ2 | 16.7 |
0.11 (0.06–0.16) |
8.26 × 10-4 (6.72–9.80 × 10-4) |
0.1611 | 0.69 |
|
Summer water pulse vs. elevation (1C) |
y = β1 + xβ2 | 272.8 |
3.65 (2.02–3.14) |
-1.37 × 10-3 (-1.96–-0.78 × 10-3) |
1.94 | 0.18 |
|
Summer substrate pulse vs. elevation (1E) |
y = β1exβ2 | 269.9 |
3.54 (2.18–4.91) |
-3.27 × 10-4 (-6.08–0.45 × 10-4) |
1.90 | 0.07 |
|
Winter water pulse vs. elevation (1D)* |
y = β1exβ2 | 32.0 |
0.19 (0.03–0.35) |
6.04 × 10-4 (1.80–10.28 × 10-4) |
0.39 | 0.18 |
|
Summer control vs. temp. (2A)* |
y = β1exβ2 | 25.0 |
1.03 (0.88–1.31 |
-0.04 (-0.05–-0.03) |
0.21 | 0.46 |
|
Summer control vs. water content |
y = β1 + xβ2 | 29.8 |
0.05 (-0.22–0.12)** |
0.16 (0.12–0.21) |
0.24 | 0.31 |
|
Summer water pulse vs. control |
y = β1exβ2 | 272.4 |
5.31 (3.29–7.34) |
-3.44 (-5.11–-1.77) |
1.75 | 0.30 |
|
Summer substrate pulse vs. control |
y = β1exβ2 | 33.6 |
0.35 (0.15–0.54) |
0.60 (0.01–1.19) |
0.40 | 0.12 |
|
Winter substrate pulse vs. control |
y = β1 + xβ2 | 94.2 |
1.29 (0.51–2.08) |
1.29 (0.22–2.34) |
1.10 | 0.14 |
*The residuals of these models exhibited significant heteroskedasticity (P < 0.05 Breush-Pagan test) and errors in models were estimated using robust linear or nonlinear methods.
**This intercept coefficient was not significant, but the overall model was (P < 0.05).