Regeneration dynamics and meintenance mechanism of forest community

1)研究了日本不同林型的林隙更新动态，阐明了林隙扰动机制。并对不同林型中主要树种的林隙更新行为进行了分析和评价。2)研究了日本中部小川森林保护区物种丰富的温带原生林永久样地6 ha的森林群落动态。种群更替时间与物种最大胸径大小呈正相关，表明大胸径物种种群变化缓慢。3)在具有晶格结构的模型种群中，对森林树木的波动再生进行了理论研究。二维模型往往比一维模型产生更规则的波再生模式。4)以奈良市桂山暖温带常绿栎林林冠间隙为研究对象，研究了梅花鹿（Cervus nippon）取食对先锋树种更新的影响。在过去的90年里，即使经历了两次主要的风扰动，先驱花椒（Zanthoxylum ailanthoides）也成功地再生了好几年。这可能是由于鹿的觅食压力减少了。5)对日本田中山黑松人工林自然再生乔木的空间分布进行了研究。常压属、风属和攀缘属的树苗和幼苗的分布特别集中在其母树附近。

1)Gap-regeneration dynamics of different forest types of Japan was investigated and gap-disturbance regime of these forest types was clarified.Also, gap-regeneration behavior of major tree species in these forest types was clarified and evaluated.2)Forest community dynamics were studied in a 6 ha permanent plot of a species rich, old-growth, temperate deciduous forest in Ogawa Forest Reserve, central Japan.The turnover time of population is positively correlated with the maximum dbh size of the species, indicating the slow change of the population of large sized species.3)The wave regeneration of forest trees is studied theoretically in model populations with a lattice structure.Two-dimensional models tend to produce more regular wave regenerating patterns than one-dimensional models.4)The effects of Sika deer(Cervus nippon)browsing on the regeneration of pioneer species were studied in relation to canopy gaps in a warm temperate evergreen oak fofest in Kasurayama, Nara City.Successful regeneration of a pioneer, Zanthoxylum ailanthoides, occurred for several years even after two major wind disturbances during the past 90 years.This may be due to less browsing pressure from the deer.5)Spatial distribution of natural regenerating trees were measured in a Pinus thunbergii plantation on Mt.Tanakami, Japan.The distribution of saplings and seedlings of barochores, anemochores, and coppicing species was especially clustered near their mother trees.