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）在1995年至1997年之间，每年在日本山毛榉森林中研究了四种灌木的水果生产及其空间破坏。在三种灌木中，桅杆一年的水果产量量远低于树种的量。种子大小及其形态在它们之间也相似。（2）在四个物种中，茎的死亡率随着拉梅尺寸的增加而迅速降低，但在拉米特达到开花和播种大小后略微增加。观察到的模式与很少发芽的树种报道的模式相同。每一年，茎总数的10-20％是通过发芽的四种灌木来招募的。这些发芽的茎在第一年的死亡率非常低，约10％。每一年，三种物种出现了当前年的幼苗（Lindera umbellata var.mbranacea，木甲菊，木兰的盐虫和墨西哥脆皮）在森林地面上的地板上的分布却相当低。观察到绣球花panniculata的铺设分支的碎片繁殖。

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）