Table 7.

Test statistics for squared Mahalanobis distances among different studied species in the discriminant functional analysis with C, N, P, K, S, Ca and Mg concentrations and N:P, N:K and P:K concentration ratios of leaves, branches and stems, and the foliar:wood content ratio of the seven elements studied as variables and the 1004 plots dominated by the 15 most representative forest tree species of Catalonia. All distances are significantly higher than cero based on F test (P < 0.001).

	Pinus sylvestris	Pinus nigra	Pinus uncinata	Pinus pinaster	Quercus ilex	Pinus pinea	Castanea sativa	Arbutus unedo	Quercus canariensis x humilis	Quercus suber	Quercus cerrioides	Quercus humilis	Quercus petraea	Fagus sylvatica
Pinus halepensis	10.6	13.6	43.2	28.6	13.9	11.6	40.9	18.5	17.23831	32.48	78.1	17.6	37.8	37.5
Pinus sylvestris		4.05	21.0	24.6	18.4	14.9	36.1	15.5	18.8	35.0	88.2	22.2	34.0	32.0
Pinus nigra			13.8	19.6	21.7	19.7	42.0	22.4	21.2	36.20	89.2	26.5	44.5	42.1
Pinus uncinata				29.8	50.3	55.5	68.2	51.8	47.2	61.5	115	54.2	78.7	72.9
Pinus pinaster					26.3	37.0	40.1	39.8	32.4	43.7	88.4	36.8	64.5	58.7
Quercus ilex						23.9	39.8	13.23	9.89	18.6	60.4	13.8	32.4	30.1
Pinus pinea							49.8	20.1	27.7	42.9	86.6	29.2	45.0	42.6
Castanea sativa								39.2	26.5	54.7	108	42.2	46.9	48.6
Arbutus unedo									14.1	32.7	80.4	19.3	33.5	36.4
Quercus canariensis x humilis										20.0	60.3	11.5	28.0	31.9
Quercus suber											68.0	23.0	38.5	35.49
Quercus cerrioides												50.5	95.5	86.09
Quercus humilis													24.0	30.6
Quercus petraea														16.0