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Regeneration characteristics of Quercus communities in Sado Island.

佐渡岛栎属群落的更新特征。

基本信息

批准号：
10660140
负责人：
MIGUCHI Hideo
金额：
$ 1.28万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The purpose of this study was to clarify the regeneration characteristics of Quercus communities (Q.dentata and Q. salicina) in Sado Island from the view points of the regeneration process estimated from the stand structure, the limiting factors in regeneration process from flowering to seedling establishment, the function of seed dispersing predator of wood mouse, and the safe site of seedling.1. Regeneration process : The frequency distribution patterns of height and diameter at breast height of Q. salicina in study stand show the J-shape and bell-shape, respectively. From this patterns, there were few saplings in the Q. salicina stand and it seem to be failed to continuous regeneration after simultaneous regeneration following the large-scale disturbance like clear cutting. Q. dentata stand had the same tendency about stand structure and regeneration process.2. Limiting factor : Pre-dispersal insect damage was the most critical limiting factor in the regeneration process of Q. dentata. As there was no fluctuation of female flower production, Q. dentata population could not escape the insect predation pressure.3. Function of wood mouse : In Sado Island, Apodemus speciosus was main seed dispersing predator of Quercus acorns. Dispersing acorns by wood mouse were once scatter-hoarded, but all caching acorns were predated until next spring.4. Safe site : There was significant correlation between the number of over five years old Q. salicina seedling and the rPPFD in winter season (from November to April). Q. salicina seedling was able to establish and grow under the deciduous tree canopy or forest margin where light intensity would be increase in winter season.Though above results are very important and useful to manage the Quercus communities in Sado Island, time and space fluctuation of acorn production and dispersion, that would be effective on the regeneration characteristics, must be continuously monitored for long time.

本研究的目的是为了明确栎属群落（齿栎和栎属）的更新特征。从林分结构估算的更新过程、开花至成苗更新过程中的限制因子、木鼠的种子传播捕食作用、安全育苗地等方面对佐渡岛柳属（salicina）的更新过程进行了研究.更新过程：树高和胸径的频率分布型。研究林分中柳属植物分别呈J形和钟形。从这个规律来看，Q中的树苗很少。柳树林分在皆伐等大规模干扰下同步更新后，似乎无法继续更新。Q.齿栎林在林分结构和更新过程上具有相同的趋势.限制因子：扩散前虫害是更新过程中最关键的限制因子。有齿的由于雌花产量无波动，Q.有齿象种群无法逃脱昆虫的捕食压力.林鼠的作用：在佐渡岛，高山姬鼠是栎属橡实种子传播的主要捕食者。木鼠分散橡子曾经被分散囤积，但所有的缓存橡子都提前到明年春天。安全场地：五岁以上儿童Q.在冬季（11月至次年4月），对柳（salicina）幼苗和rPPFD的生长发育进行了研究。Q.虽然上述结果对佐渡岛栎属群落的管理具有重要意义，但橡子生产和扩散的时空波动对更新特性的影响必须长期持续监测。