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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.

From: Effects of Prescribed Fire at Two Frequencies on N Mineralization and Nitrification at Two Spatial Scales in Mixed-Oak Forests

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)