Species-area curves of tree species (DBH>5cm).
AY: Aya Research Site. An evergreen broad-leaved forest in southwestern Japan (32^oN 131^oE, 370-480m a.s.l.).
OG: Ogawa Research Site. A deciduous broad-leaved forest in central Japan (37^oN 141^oE, 610-660m a.s.l.).
KR: Kanumazawa Riparian Research Site. A deciduous broad-leaved forest in northern Japan (39^oN 141^oE, 400-440m a.s.l.).
KU: An upland deciduous broad-leaved forest neighbouring KR (430-450m a.s.l.).
SN: Senju Research Site. A deciduous broad-leaved forest in central Japan (37^oN 140^oE, 1280-1290m a.s.l.).