Ordinations of redundancy analyses of forest compartments in the central Valais: (a) all 310 compartments (total variance explained: 35%; species-environment correlations axes 1 and 2: 0.76 and 0.46); (b) 123 compartments below 1200 m a.s.l. (28%; 0.65, 0.47); and (c) 187 compartments above 1200 m a.s.l. (33%; 0.74, 0.41). Grey and black symbols indicate years 1930 and 1994, respectively; symbol heights correspond to the square root of cover sums; environmental variables with asterisks are significant.