Table 3 Semivariance analysis of soil properties at two spatial scales in Ohio mixed-oak forests. Only regression models significant at p≤0.05 are shown; N=33 for 50m2 macroplots and N=23 for 1m2 microplots. The proportion of variance attributable to spatial structure is given as the ratio of the structural variance, C, to the total variance (C+Co). The maximum range of significant spatial autocorrelation is given, with predicted ranges outside of the limits of the sampling design indicated in parentheses.
Parameter | Fire Frequency | Plot Size (m2) | Spatial Structure | Range (m) | Spatial Structure | Range (m) |
|---|---|---|---|---|---|---|
Total Inorganic N | control | 50 | 27.1% | (>7.78) | 65.3% | (>7.78) |
(mg N/kg soil) | periodic | 50 | 76.7% | (>7.78) | 81.7% | 5.83 |
annual | 50 | n/a | n/a | 70.5% | 2.02 | |
control | 1 | 21.3% | (>0.82) | n/a | n/a | |
periodic | 1 | 63.0% | (>0.82) | 72.1% | 0.68 | |
annual | 1 | 87.2% | (>0.82) | 87.2% | 0.53 | |
N mineralization | control | 50 | 69.7% | (>7.78) | 59.7% | (>7.78) |
(mg N/kg soil/25 d) | periodic | 50 | 85.4% | 0.90 | 96.9% | 1.38 |
annual | 50 | 71.5% | (>7.78) | 27.1% | (>7.78) | |
control | 1 | 66.0% | 0.45 | 89.8% | 0.26 | |
periodic | 1 | 72.1% | (>0.82) | 21.3% | (>0.82) | |
annual | 1 | 22.3% | (>0.82) | 34.2% | (>0.82) | |
Net nitrification | control | 50 | 36.0% | (>7.78) | 80.8% | (>7.78) |
(mg N/kg soil/25 d) | periodic | 50 | 74.0% | (>7.78) | 77.6% | 4.12 |
annual | 50 | 77.8% | 0.85 | 35.4% | (>7.78) | |
control | 1 | 85.5% | 0.81 | 21.3% | (>0.82) | |
periodic | 1 | 61.7% | (>0.82) | 69.8% | 0.58 | |
annual | 1 | 21.7% | (>0.82) | 21.3% | (>0.82) | |
Soil Organic C | control | 50 | 79.9% | 1.31 | 27.0% | (>7.78) |
(g C/kg soil) | periodic | 50 | 27.0% | (>7.78) | 55.3% | (>7.78) |
annual | 50 | 69.9% | (>7.78) | n/a | n/a | |
control | 1 | 21.3% | (>0.82) | 99.9% | 0.26 | |
periodic | 1 | 68.8% | (>0.82) | 21.3% | (>0.82) | |
annual | 1 | n/a | n/a | 21.2% | (>0.82) |