NERI;
Dept.of Landscape Ecology;
Grenvej 14;
DK-8410 Rnde;
Denraark;
Forest Vegetation Ecology;
SLU;
SE-90183;
Ume;
Sweden;
Plant Ecology;
Φ.Farimagasgade 2D;
DK-1353 Copenhagen K;
Denmark;
of Forest Ecology;
Forest and Landscape Research Institute;
Hrsholm Ko;