Demography and growth pattern of understory shrubs in a Japanese beech forest.

日本山毛榉林林下灌木的人口统计和生长模式。

• 批准号: 07640851
• 负责人: HARA Masatoshi
• 金额: $ 1.34万
• 依托单位: Natural History Museum and Institute, Chiba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640851/
• 关键词: Shrub; Demography; seed production; beech forest; clone; growth pattern

(1) In each year between 1995 and 1997, fruits production and its spatial destribution were studied for four shrub species in a Japanese beech forest. The amount of fruit production in the mast year, which were far less than those of tree species, were rather similar among three shrub species. The seed size and its morphology were also similar among them.(2) In all of four species sxamined, the mortality of stems rapidly decreased with the increase of ramet size but slightly increased again after the ramet reaching the flowering and seeding size. The pattern observed is the same with those reported for tree species which rarely sprout.Every year, 10-20% of the total number of stems were recruited by sprouting for four shrub species. The mortality of these sprouted stems in the first year was very low, about 10%.Every year, the current-year seedlings appeared for three species (Lindera umbellata var.membranacea, Magnolia salicifolia and Viburnum furcatum) in the forest floor, although its distribution were scattered and the densties were quite low.Clone morphology and the interconnection among stems were examined by excavating the clone. Vegetative reproduction by the fragmentation of layred branches was observed for Hydrangea panniculata.

(1)1995 ~ 1997年，对日本山毛榉林4种灌木的果实生产及其空间分布进行了研究。3种灌木的丰产年结果量相差不大，但均远低于乔木。它们之间的种子大小和形态也相似。(2)4种植物茎的死亡率均随分株大小的增加而迅速下降，但在分株达到开花和结实大小后又略有上升。四种灌木每年有10-20%的树干被萌芽吸收，这与文献报道的很少萌芽的树种是一致的。这些发芽茎第一年的死亡率很低，约为10%。每年，林下都会出现3种（膜叶乌药、柳叶木兰和叉叶荚�o）的当年生幼苗，但分布较分散，密度较低。通过挖掘克隆，研究了克隆形态和茎间的相互关系。观察到八仙花的分层枝断裂的营养繁殖。

项目成果

Hara, M.(ed): Natural History of Japanese Beech Forest. (in Japanese.). Heibonsha, Tokyo., 237 (1996)

Hara, M.（编辑）：日本山毛榉林的自然历史。

Hirabuki,Y.,Kawauchi,Y.,Takehara,A.,and Hara,M.: "Comparison of the soil-surface temperature among three microsites in and outside of a treefall gap." Saito Ho-on Kai Mus. Nat.Hist.,Res.Bull.65. 27-35 (1997)

Hirabuki,Y.、Kawauchi,Y.、Takehara,A. 和 Hara,M.：“树木倒落间隙内外三个微地点的土壤表面温度比较。”

原 正利編・著: "ブナ林の自然誌" 平凡社, 237 (1997)

原正俊编着：《山毛榉林的自然史》Heibonsha，237（1997）

Hirabuki,Y., Kawauchi,Y., Takehara,A.and Hara,M.: "Comparison of soil-surface temperature among three microsites in and outside of a treefall gap." Saito Ho-on Kai Mus.Nat.hist., Res.Bull.65. 27-35 (1997)

Hirabuki,Y.、Kawauchi,Y.、Takehara,A. 和 Hara,M.：“树木倒落间隙内外三个微站点之间的土壤表面温度比较。”

大野啓一・原 正利: "自然保護ハンドブック" 朝倉書店, 821 (1998)

大野敬一和原正敏：《自然保护手册》朝仓书店，821（1998）