Structure and dendroecology of Thuja occidentalis in disjunct stands south of its contiguous range in the central Appalachian Mountains, USA

Forest Ecosystems

Table 1 Compositional characteristics by forest stand

Site	Species	D	BA	IV
CS1	Thuja occidentalis L.	830	54.8	82.2
	Quercus muehlenbergi Engelm.	40	0.5	2.3
	Liriodendron tulipifera L.	40	3.6	4.7
	Ostrya virginiana (Mill.) K. Koch	50	0.2	2.5
	Cercis canadensis L.	20	0.1	1.0
	Acer saccharum Marshall	10	0.5	0.9
	Pinus strobus L.	50	2.3	4.2
	Fraxinus americana L.	30	1.1	2.3
CS2	Thuja occidentalis L.	310	29.2	52.5
	Tilia americana L.	60	9.9	14.8
	Cercis canadensis L.	110	0.2	7.5
	Ostrya virginiana (Mill.) K. Koch	140	1.5	10.9
	Cornus florida L.	10	0	0.7
	Hamamelis virginiana L.	20	0	1.3
	Ailanthus altissima (Mill.) Swingle	20	1.9	3.3
	Juglans nigra L.	10	0	0.7
	Acer saccharum Marshall	20	0.9	2.3
	Fraxinus americana L.	60	1.9	6.0

Columns refer to density (D, stems/ha), basal area (BA, m²/ha), and importance value [IV = (relative density + relative basal area)/2]