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

Fry, Danny L.; Stevens, Jens T.; Potter, Andrew T.; Collins, Brandon M.; Stephens, Scott L.

doi:10.1186/s42408-018-0017-5

Fire Ecology

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

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