The distribution of native herbaceous and woody plants in different forest stand types planted 33 years ago in Obihiro no Mori, an Urban Park

都市域の人工林の再生過程を把握するため, 植栽後33年が経過した落葉広葉樹林, 常緑針葉樹林および針広混交林に区分される植栽地で, 同地に定着した在来草本・木本の分布と林分タイプとの関係を検討した。年間を通して暗い光環境である常緑針葉樹林および針広混交林の針葉樹が多い場所では, 林床でミヤコザサなどの特定の種が単独で優占しにくく, 多くの在来草本・木本種の定着がみられた。春に明るい光環境である落葉広葉樹林および針広混交林の広葉樹が多い場所等では, 林床でミヤコザサが単独で優占し, 草本植物のオオバナノエンレイソウおよびユキザサは定着できる可能性が考えられた。一方, 木本植物は定着が阻害された可能性が考えられた。To understand the establishment of an artificial urban forest the distribution of native herbaceous and woody plants in coniferous, broad-leaved and mixed stand types was studied. In coniferous stands and a coniferous area of mixed stands there were low-light conditions year-round and no specific species, such as <I>Sasa nipponica</I>, was dominant, but native herbaceous and woody plants were found to grow better. Brighter light conditions in the spring in broad-leaved stands and the broad-leaved area of mixed stands led to <I>S. nipponica</I> dominating and several native herbaceous species growing better as well, possibly suppressing the growth of woody plants