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对天宝岩国家级自然保护区长苞铁杉林不同海拔、不同腐烂等级枯倒木的径级结构、高度/长度分布,以及材积分布特征等进行了研究,结果表明:(1)天宝岩长苞铁杉林枯倒木主要由小径级木组成,且数量随着海拔的升高呈先降低后上升的趋势,中径级枯倒木所占比例呈现出先升高后降低的趋势,而大径级枯倒木数量最少;(2)枯倒木的高度/长度主要集中在1～6 m,随着高度/长度的增加,各海拔分布的枯倒木所占比例均减小;(3)不同腐烂等级枯倒木材积的变化趋势为Ⅲ>Ⅳ>Ⅱ>Ⅴ>Ⅰ;(4)不同径级枯倒木材积的分布呈现中径级较大,大径级次之,小径级较小的趋势。
The diameter structure, height / length distribution, volume distribution and other characteristics of the seedlings of T. crassifolia at different altitudes and different rotten grades in Tianbaoyan National Nature Reserve were studied. The results showed that: (1) Cunninghamia lanceolata was mainly composed of small-diameter wood, and the number decreased first and then increased with the elevation. The proportion of middle-diameter fallen wood showed the trend of first increasing and then decreasing, while the number of large-diameter class dead wood was the least. (2) The height / length of the fallen wood mainly concentrated in 1 ~ 6 m. With the increase of height / length, the proportion of dead wood in all altitudes decreased; (3) Ⅲ> Ⅳ> Ⅱ> Ⅴ> Ⅰ. (4) The wood volume distributions of different diameter grade traps tended to be larger in diameter, larger in diameter and smaller in diameter.