Regeneration dynamics and meintenance mechanism of forest community

1)对日本不同森林类型的林隙更新动态进行了调查，厘清了这些林型的林隙干扰机制，并对这些林型的主要树种的林隙更新行为进行了研究和评价。2)对日本中部小川森林保护区6公顷的物种丰富、老树、温带落叶林的森林群落动态进行了研究。种群周转时间与树种的最大胸径呈正相关。3)在具有网格结构的模式种群中对林木的波浪更新进行了理论研究。二维模型往往比一维模型产生更多的规则波更新模式。4)以奈拉市Kasurayama暖温带常绿橡树林隙为例，研究了梅花鹿(Cervus Nippon)取食对先锋物种更新的影响。即使在过去的90年里，在两次大的风扰之后，也有几年发生了这种情况。这可能是由于鹿的采食压力较小。5)在日本田上山的一座黑松人工林中，测量了自然更新树木的空间分布，特别是树苗和树苗的分布都集中在它们的母树附近。

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.