Combining both biological diversity and cultural significance, populations of big trees in Japan are considered important. Furthermore, individual specimens, often with broken and unusual tree form, are highly striking and create a ‘sense of place’ in a locale. The giant Castanopsis sieboldii trees belonging to the family Fagaceae have a trunk circumference of over 3 m. These trees are distributed on various landforms in Tokyo and its western suburbs. In this study, we conducted field surveys to determine the distribution pattern and geographical conditions of giant C. sieboldii trees growing in urban areas and western suburbs of Tokyo. The topography of Tokyo is variable, comprising mountainous areas, hills, plateaux, lowlands, and reclaimed lands with large rivers or streams. The places where giant C. sieboldii trees grew were classified into 13 categories using cluster analysis of geomorphic landscape sections. The lowest point of the area within a 2-km radius surrounding the giant trees was determined through field surveys and based on geomorphic sections in four directions. Trees growing on slopes, plateaux, and hilltops or mountain tops, or along the edges of plateaux represented 80 % of the total recorded trees. Two categories were an exception to this, where the height difference between the lowest and highest altitude was less than 10 m. Giant trees were mostly distributed above the 10-m contour line, on plateaux or hills and especially on slopes along the edges of 10, 30, 120, 170, and 210-m contour lines on flat uplands. Altitude appeared to be a significant factor for giant tree distribution, with only a few giant trees located below the 10-m contour line in low lying or reclaimed lands. Finally, we discuss the reasons underlying this unique distribution of C. sieboldii in the light of the physical characteristics of different landforms.

结合生物多样性和文化意义，日本的大树种群被认为是重要的。此外，个别标本（通常具有断断续续和不寻常的树形）非常醒目，并在现场产生“位置感”。隶属于菊科的巨型锥栗西伯来亚树的树干周长超过3 m。这些树木分布在东京及其西郊的各种地貌上。在这项研究中，我们进行了实地调查，以确定巨型C. sieboldii的分布模式和地理条件在东京市区和西郊生长的树木。东京的地形是可变的，包括山区，丘陵，高原，低地以及开阔的河流或溪流的土地。巨型C. sieboldii的地方利用地貌景观剖面的聚类分析，将生长的树木分为13类。巨树周围2公里半径内的区域最低点是通过实地调查并基于四个方向的地貌剖面确定的。在斜坡，高原，山顶或山顶或高原边缘上生长的树木占记录的树木总数的80％。仅有两个类别是例外，最低和最高海拔之间的高度差小于10 m。巨树主要分布在高原或丘陵的10米等高线上方，尤其是在平坦山地上沿10米，30米，120米，170米和210米等高线边缘的斜坡上。海拔似乎是影响巨型树木分布的重要因素，在低洼或开垦的土地上，只有几棵巨树位于10米高的轮廓线以下。最后，我们讨论了这种独特分布的原因C.天女在不同地形的物理特性的光。