Annals of Forest Science

Table 2 Percentages of plots in nutrition classes for groups of plots with species-specific critical limits for inorganic N (Nmin) and Al (Bc/Al < threshold) exceeded in none (0 %), in a minority (>0 % − 50 %) and in the majority (>50 %) of the soil solution samples from the inorganic topsoil (0- to 40-cm depth)

From: Exceedance of critical loads and of critical limits impacts tree nutrition across Europe

Species Group^a	Nmin	N in foliage			Mg in foliage			N/Mg in foliage			Plots
Species Group^a	exceedance	L/D	A-O	H/S	L/D	A-O	H/S	L/D	A-O	H/S	n
Spruce	0 %	45	55	0	0	100	0	36	64	0	11
	>0 % − 50 %	12	88	0	0	85	15	32	68	0	26
	>50 %	3	97	0	3	90	7	20	63	17	30
Pine	0 %	11	78	11	0	100	0	11	89	0	9
	>0 % − 50 %	0	95	5	5	95	0	0	75	25	20
	>50 %	7	57	36	7	86	7	14	57	29	14
Fir	0 %	100	0	0	0	100	0	100	0	0	1
	>0 % − 50 %	14	86	0	14	43	43	86	0	14	7
	>50 %	0	100	0	0	67	33	100	0	0	3
Beech	0 %	0	33	67	25	50	25	0	33	67	4
	>0 % − 50 %	0	78	22	26	35	39	0	61	39	23
	>50 %	0	65	35	36	27	36	0	50	50	22
Oak	0 %	0	100	0	0	100	0	0	100	0	5
	>0 % − 50 %	0	17	83	0	100	0	0	100	0	6
	>50 %	0	46	54	0	100	0	0	85	15	13
Species group^a	Bc/Al <	N in foliage			Mg in foliage			N/Mg in foliage			Plots
Species group^a	threshold	L/D	A-O	H/S	L/D	A-O	H/S	L/D	A-O	H/S	n
Spruce	0 %	14	86	0	0	86	14	33	67	0	21
	>0 % − 50 %	23	77	0	0	87	13	32	64	5	23
	>50 %	5	95	0	5	95	0	18	64	18	22
Pine	0 %	0	78	22	11	89	0	0	78	22	9
	>0 % − 50 %	0	94	6	0	100	0	0	88	12	17
	>50 %	8	62	31	8	92	0	8	54	38	13
Fir	0 %	29	71	0	0	71	29	100	0	0	7
	>0 % − 50 %	0	100	0	0	0	100	100	0	0	1
	>50 %	0	100	0	50	0	50	50	0	50	2
Beech	0 %	0	66	34	32	35	32	0	53	47	34
	>0 % − 50 %	0	75	25	38	25	38	0	50	50	8
	>50 %	0	100	0	100	0	0	0	0	100	1
Oak	0 %	0	45	55	0	100	0	0	91	9	22
	>0 % − 50 %	0	100	0	0	100	0	0	100	0	1
	>50 %	0	0	0	0	0	0	0	0	0	0

Legend: Nmin=exceedance of species-specific critical limits for Nmin in soil solution; Bc/Al < threshold=species-specific critical limit for Al toxicity for soil solution: 0 %=exceeded in any sample, >0–50 %=exceeded in a minority of samples, >50 %=exceeded in a majority of samples. Foliar concentration ranges: L/D=low/deficient, A-O=adequate to optimum, H/S=high/surplus; n=number of plots
^aSpecies grouped as suggested by Stefan et al. (1997)

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ISSN: 1297-966X

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