Nitrogen deposition causes eutrophication in bryophyte communities in central and northern European forests

Table 1 Model results for community mean N preference (Ellenberg N). Approximate significance of the intercept, any parametric terms and the smooth terms for single variables and tensor product smooth terms for interactions

					Mean Ellenberg N
Predictors					edf	Chi.sq	p
Smooth term (NH4, NO3)					7.20	70.51	< 0.001
Smooth term (canopy)					0	0	0.913
Smooth term (precipitation)					0.96	12.05	< 0.001
Smooth term (age)					1.82	17.76	< 0.001
Smooth term (pH)					3.27	134.62	< 0.001
Tensor product smooth term (longitude, latitude, year)					25.75	165.41	< 0.001
Parametric coefficient
	Estimate	Std. error	z-value	p
Intercept	3.74	0.049	76.83	< 0.001
Fixed effect (forest type)	−0.73	0.067	−10.95	< 0.001
Deviance explained = 59.4%

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