Studies on Invading Manners of Broad-leaved Trees into Blighted Pinus Stand and Mechanisms of Spreading their Distribution

Invading and spreading manners of broad-leaved tree species into coastal Pinus stands were studiedin Hokuriku and South Thohoku district in Central Japan. 102 tree species and 88 herb species wereappeared and especially Prunus，Quercus and Rhus were typicla genera in those areas. Canopy gaps which created by the blighted pinetrees were filling up with broad-leaved tree species.In artificial Pinus densiflora stand on sanddune,the under vegetations were divided into 3 types. patch community type which mainly consisted ofRhus trichocarpa was successional seral community from the no undergrowth type to the type dominatedby broad-leaved tree species.Seedfallgermination and survival of Pinus densi-flora and some broad-leaved tree species in Pinus densi-flora and some broad-leaved tree specieseach community types.Reproductive behaviors on Rhus trichocarpaPrunus apetara var. pilosa and Quercus serrata were profitable for spreading on space and time inseral communities.Seed of Quercus serrata and that of almost all tree species were dispersed bymurid rodents and birdsMechanisms on spreading the broad - leaved tree species were discussed. respectively. Mechanisms on spreading the broad - leaved tree species were discussed。

Invading and spreading manners of broad-leaved tree species into coastal Pinus stands were studied in Hokuriku and South Thohoku district in Central Japan. 102 tree species and 88 herb species were appeared and especially Prunus, Quercus and Rhus were typicla genera in those areas. Canopy gaps which created by the blighted pine trees were filling up with broad-leaved tree species.In artificial Pinus densiflora stand on sand dune, the under vegetations were divided into 3 types. The patch community type which mainly consisted of Rhus trichocarpa was successional seral community from the no undergrowth type to the type dominated by broad-leaved tree species.Seedfall, germination and survival of Pinus densi-flora and some broad-leaved tree species were surveyed in each community types.Reproductive behaviors on Rhus trichocarpa, Prunus apetara var. pilosa and Quercus serrata were profitable for spreading on space and time in seral communities.Seed of Quercus serrata and that of almost all tree species were dispersed by murid rodents and birds, respectively. Mechanisms on spreading the broadーleaved tree species were discussed.