Stand Structure and Regeneration Dynamics of Old-Growth Chamaecyparis Stands in the Kiso District, Central Japan

日本中部木曾地区老桧林的林分结构和再生动态

基本信息

批准号：
63560151
负责人：
YAMAMOTO Shin-ichi
金额：
$ 1.66万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

Stand structure and regeneration dynamics of old-growth Chamaecyparis stands in the Kiso district, central Japan, were studied during 1985 to 1990. A shape of dbh-class distributions was normal in Chamaecyparis obtusa dominated stands, but that was inverse J-shaped in a Chamaecyparis pisifera - hardwood stand. These shapes did not change for the five years. Mortality of canopy trees (dbh<greater than or equal>20cm) occurred in C. obtusa stand with 1.3-3.1% mortality, but no canopy trees died in the C. pisifera - hardwood stnd. Mortality of understory trees (dbh<20cm, height<greater than or equal>1.3cm) was 8.3-22.9% and the value of Thujopsis dolabrata was 12.2-22.9%. Abundance of new seedlings fluctuated annually ; many seedlings of C. obtusa emerged in 1986 and those of C. pisifera emerged in 1987 and 1989. Ex-posed mineral soils in a recently disturbed stand was the most favourable site for seedling recruitment of C. obtusa. Seed production of Chamaecyparis also fluctuated annually ; 4,479 seeds per sq. m of C. obtusa was produced in a abundant year and 4,324 seeds per sq. m for C. pisifera. Amount of leaf litter-fall was about 3ton/ha/yr in C. obtusa stands. There were 7,186 trees (dbh<greater than or equal>5cm) including 718 dead trees in a 4ha plot ; dbh class distributions of C. obtusa and C. pisifera were bimodal in shape without lacked classes and the kistribution of Quercus mon-golica var. grosseserrata was also bimodal but with lacked classes. The distribution of T. dolabrata showed inverse J-shaped. Canopy trees of C. obtusa randomly dispersed, but the understory trees did patchily. Canopy trees of T. dolabrata showed a nearly random distribution, and the understory trees occurred over a whole area in the plot. C. pisifera showed a nearly random in its distribution of canopy trees and a patchy distribution in the understory trees. Understory trees of Q. mongolica also showed a patch

在1985年至1990年间，对旧生长的Chamaecyparis的陈旧结构和再生动态进行了研究。在Chamaecyparis obleusa主导的林分中，DBH级分布的形状正常，但在Chamaecyparis pisifera-pisifera-hardwood-Hardwood-hardwood Stand中是反向的J形。这些形状在五年内没有改变。 C. ottusa林中发生冠层树的死亡率（DBH <<大于或相等> 20厘米），死亡率为1.3-3.1％，但没有冠层树在Pisifera C. pisifera -Hardwood STND中死亡。林木的死亡率（DBH <20厘米，高度<大于或等于> 1.3厘米）为8.3-22.9％，thujopsis dolabrata的价值为12.2-22.9％。每年有大量的新幼苗波动； 1986年出现了许多o ott虫的幼苗，1987年和1989年出现了pisifera的幼苗。最近受干扰的林分中的前矿物土壤是幼苗募集C. ottusa的最有利位置。 Chamaecyparis的种子生产也每年波动；每平方米的o otusa每平方米4,479个种子在大量的一年中生产，而Pisifera的每平方英尺4,324个种子。 C. ottusa架子中的叶子垃圾倒车的数量约为3吨/公顷/年。有7,186棵树（DBH <大于或相等> 5厘米），其中包括4HA地块中的718棵枯树； C. ottusa和C. pisifera的DBH类别分布是双峰的，没有缺乏类别和山山山怪异的山脉。 Grosseserrata也是双峰，但缺乏课程。 T. dolabrata的分布显示逆J形。 C. ottusa的树冠树随机分散，但林下的树木确实很贴心。 T. dolabrata的树冠树显示出几乎随机的分布，林木树发生在整个地块的整个区域。皮西法拉（C. pisifera）在冠层树的分布和林下树中的分布中显示出几乎随机的。 Q. Mongolica的底林也显示了一个补丁