Studies on early recovering phases of canopy gaps created by a 1987 typhoon in the Tatera Forest Reserve, Tsushima.

塔特拉森林保护区支持着从低海拔(约120米)到高海拔(560米)的原始常绿阔叶林。本项目包括6个方面的内容：1)低海拔栎林4公顷永久样方的5 cm乔木种群普查；2)低海拔到高海拔栎林样带的树木种群普查；3)海拔梯度上植物群落的梯度分析；4)林隙植被研究；5)林隙苔藓植物研究；6)树冠林隙内幼苗和树苗的生长分析。获得的结果如下。1)林窗直径在5~20m之间，主要分布在低海拔的红锥/百里香森林中。林隙占低海拔林区面积的17.1%。2)林木胸径分布有三种类型：双峰型(如尖锥)、倒J型(总状叶栎属)和正态曲线型(栓皮栎属)。各树种种群的分布均呈倒J型分布。3)乔木、灌木和草本种群的植物分布在350-400m海拔带附近变化较大，而每100m^2的物种密度在同一海拔梯度上变化不大，物种多样性指数逐渐降低。4)林隙指标由高到低依次为：多花胡萝卜树、海棠、软枣猕猴桃、花椒、枫树、构树、白蜡梅。麦格纳。5)指示林隙的苔藓指标为银莲花、银莲花、钝顶叶蝉、细叶苔藓和凤尾苔藓。6)生长速率较高的植物从高到低依次为：光叶胡颓子、含笑、花椒、构树、山茶。

Tatera Forest Reserve supports the primeval evergreen broad-leaved forest from low (ca. 120 m) to high elevations (560 m). The present project consists of six aspects : 1) tree population (dbh>5cm) census in a 4 ha permanent quadrat of low elevbation Castanopsis/Distylium forest, 2) the same in a belt-transect from low- to high-elevation Quercus acuta forest, 3) gradient analysis of phytocoenose over the elevation gradient, 4) vegetation study in canopy gaps, 5) bryophyte study in the gaps, 6) growth analysis of seedlings and saplings found in canopy gaps. The results obtained were as follows. 1) The size of canopy gaps ranges 5-20 m in diameter, found mostly in low-elevation Castanopsis/Distylium forests. The gaps occupy 17.1% of the low-elevation forest tract. 2) There are three types in dbh distributions : bimodal type (e. g. Castanopsis cuspidata), reversed-J type (Distylium racemosum, Cleyera japonica), and normal-curve type (Quercus salicina). The distribution of all tree populations is a reversed-J type. 3) Plant distributions in tree, shrub and herbaceous populations change rather abruptly around the 350-400 m elevation belt, while species density per 100 m^2 does not change and species diversity indices decrease gradually along the same elevation gradient. 4) Indicators of canopy gaps are (in order of occurrence frequency) Idesia polycarps, Mallotus japonicus, Actinidia arguta, Zanthoxylum ailanthoides, Rhus succedanea, Broussonetia papyrifera, and Berchemia racemosa var. magna. 5) Bryophytic indicators of gaps are Leucobryum juniperoideum, Syrrhopdon japonicus, Neckeropsis obtusata, Fauriella tenuis, and Eurhynchium hians. 6) Plants of high growth-rate are (in order from high to low) Elaeagnus glabra, Michelia compressor, Zanthoxylum ailanthoides, Broussonetia papyrifera, and Symplocos lucida.