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Table 4 Model equations relating fuel loads (Mg ha−1) collected in litter baskets and surface plots to forest structure. SD = standard error of the coefficient, t = t-statistic, P = probability, R2 = coefficient of determination.

From: Surface fuel accumulation and decomposition in old-growth pine-mixed conifer forests, northwestern Mexico

Response variable Year Variable Coefficient SD t P R2
Basket
(litter)
2010 Canopy cover 0.097 0.031 3.117 0.003 0.148
Live basal area 0.085 0.032 2.655 0.010 0.112
Live tree density 0.077 0.032 2.400 0.020 0.093
2011 Canopy cover 0.080 0.046 1.721 0.091 0.054
2012 Canopy cover 0.112 0.034 3.301 0.002 0.171
Live basal area 0.098 0.033 2.963 0.005 0.142
Live tree density 0.040 0.034 1.169 0.248 0.025
2013 Canopy cover 0.090 0.032 2.841 0.006 0.130
Live basal area 0.071 0.032 2.229 0.030 0.084
Live tree density 0.056 0.032 1.749 0.086 0.054
Basket
(total)
2010 Canopy cover 0.130 0.050 2.623 0.011 0.109
Live basal area 0.129 0.050 2.584 0.012 0.107
Live tree density 0.067 0.052 1.295 0.201 0.029
2012 Canopy cover 0.126 0.053 2.393 0.020 0.098
Live basal area 0.099 0.052 1.925 0.060 0.065
Live tree density 0.014 0.052 0.272 0.787 0.001
2013 Canopy cover 0.097 0.038 2.550 0.014 0.107
Live basal area 0.074 0.038 1.944 0.057 0.065
Live tree density 0.090 0.037 2.430 0.018 0.099
Surface plot
(10-hour)
2010 Canopy cover 0.076 0.036 2.092 0.051 0.196
Live basal area 0.078 0.033 2.370 0.029 0.238
Live tree density 0.095 0.045 2.109 0.049 0.198
2011 Live tree density 0.111 0.063 1.765 0.095 0.155
2012 Canopy cover 0.032 0.039 0.821 0.423 0.038
Live basal area 0.034 0.036 0.958 0.351 0.051
Live tree density 0.052 0.048 1.077 0.297 0.064
2013 Canopy cover –0.022 0.039 –0.571 0.575 0.018
Live basal area 0.008 0.036 0.216 0.831 0.003
Live tree density –0.014 0.048 –0.294 0.772 0.005
Surface plot
(100-hour)
2010 Canopy cover 0.047 0.024 1.926 0.070 0.171
Live basal area 0.054 0.021 2.553 0.020 0.266
Live tree density 0.011 0.033 0.346 0.733 0.007
2012 Canopy cover –0.023 0.029 –0.801 0.434 0.036
Live basal area –0.008 0.028 –0.298 0.769 0.005
Live tree density –0.045 0.036 –1.259 0.225 0.085
2013 Canopy cover –0.010 0.025 –0.397 0.696 0.009
Live basal area –0.006 0.023 –0.260 0.798 0.004
Live tree density 0.023 0.030 0.754 0.461 0.031
Surface plot
(total)
2010 Canopy cover 0.078 0.037 2.088 0.051 0.195
Live basal area 0.082 0.034 2.456 0.024 0.251
Live tree density 0.079 0.048 1.642 0.118 0.130
2012 Canopy cover 0.001 0.035 0.034 0.974 0.000
Live basal area 0.005 0.033 0.147 0.885 0.001
Live tree density 0.007 0.044 0.155 0.879 0.001
2013 Canopy cover 0.035 0.052 0.676 0.508 0.025
Live basal area 0.055 0.048 1.141 0.269 0.067
Live tree density 0.043 0.065 0.665 0.515 0.024