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

1985 ~ 1990年，对日本中部木曾地区的老杉木林分结构和更新动态进行了研究。胸径级分布的形状是正常的Chamaoparis obtusa占主导地位的立场，但这是倒J形Chamaoparis pisifera阔叶林，这些形状没有改变的五年。胸径20 cm以上的冠层木死亡<greater than or equal>率在C. obtusa林分死亡率为1.3-3.1%，而C. pisifera -硬木标准林下乔木（胸径&lt;20 cm，树高1.3cm）死亡率<greater than or equal>为8.3-22.9%，崖柏死亡率为12.2- 22.9%。幼苗的生长量逐年波动，大量的幼苗生长在同一时期。obtusa于1986年出现，C. pisifera于1987年和1989年出现。在一个最近被干扰的林分中，暴露的矿质土壤是最有利的幼苗补充地点。钝角。Chama-paris的种子产量也每年波动;每平方米4，479粒种子。m的C. obtusa产量丰年，每平方米种子4,324粒。m为C.豌豆。落叶量约为3 t/ha/yr。obtusa站。在<greater than or equal>4 hm 2样地中，有胸径5cm的乔木7,186株，其中死木718株; obtusa和C. pisifera为双峰型，无缺类; Grosseserrata也是双峰型，但缺乏类。研究了T. dolabrata呈倒J形。C. obtusa随机分散，但林下的树木却参差不齐。T. dolabrata表现出几乎随机的分布，林下树木在整个样地中出现。C.豌豆在林冠乔木层的分布呈近随机性，在林下乔木层的分布呈斑块状。林下乔木Q.蒙古也显示了一个补丁，

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