Litterfall dynamics along a successional gradient in a Brazilian tropical dry forest

Forest Ecosystems

Table 2 Multiple regression through generalized linear models (GLM, type III sum of squares) showing the effects of the scores of the first axes from four principal component analyses: (i) soil texture, (ii) soil fertility and (iii) vegetation characteristics on the mean annual litterfall mass per plot (n = 12, adjusted R² = 0.46); and (iv) climate on the mean monthly litterfall mass (n = 36, adjusted R² = 0.78)

Response varhiable	Explanatory variables	DF	Deviance	Estimate	Standard Error	F	P
Mean annual litterfall mass ~ Axis1 from PCA texture + Axis1 from PCA fertility + Axis1 from PCA vegetation
Annual litterfall mass	Null model (intercept)		0.839	1.404	0.031
	Axis1 from PCA texture	1	0.126	−0.404	0.186	5.589	0.028^a
	Axis1 from PCA fertility	1	0.016	0.009	0.035	0.709	0.409
	Axis1 from PCA vegetation	1	0.245	0.236	0.067	10.871	0.003^a
Mean monthly litterfall mass ~ Axis1 from PCA climatic
Monthly litterfall mass	Null model (intercept)		18.189	−1.103	0.168
Monthly litterfall mass	Axis1 from PCA climatic	1	14.987	−0.013	0.002	4.71	0.041^a

^a Explanatory variable retained in the minimum adequate model (P < 0.05)
Estimates indicate intercepts and coefficient parameters. At both models, response variables were log-transformed