兴安落叶松天然林不同林分结构林木水平分布格局特征研究

Study on the Distribution Pattern Characteristics of Different Stand Structures in Larix gmelinii Natural Forest

通过样地调查，分析了不同结构草类-落叶松林和杜香-落叶松林林木分布格局特征。研究表明：（1）年龄36～65年草类-落叶松林和年龄54～63年杜香-落叶松林分布格局中，均匀分布、随机分布和聚集分布所占比例分别为6．2％、50％、43．8％；（2）按林型分，草类-落叶松林分布格局中，均匀分布和随机分布所占比例均11．1％，聚集分布占77．8％。杜香-落叶松林分布格局均为随机分布；（3）树种组成在6落4阔～10落范围内，草类-落叶松林和杜香-落叶松林分布格局主要为聚集分布和随机分布两种类型。聚集分布主要集中在树种组成7落3阔～9落1阔范围内。

The distribution pattern characteristics of different stand structures in herbage-Lar/x forest and Ledum- Larix forest were analyzed by sample plots surveying. The study indicated ： （ 1 ） In the 36 - 65 years old herbage- Larix forest and 54 - 63 years old Ledum-Lafix forest distribution pattern, the proportions of even distribution, random distribution and clustered distribution were 6.3% , 50% and 43.8%. （2）From a view of forest types, in herbage-Lar/x forest distribution pattern, both the clustered distribution and regular distribution were 11.1%, the random distribution was 77.8%, while Ledum-Lar/x forest distribution pattern was all followed regular distribution. （3） In herbage-Lar/x forest and Ledum-Lar/x forest with composition of 6 Lar/x and 4 broadleaf species to 10 Lar/x and no broadleaf species, the distribution pattern was mostly clustered distribution and random distribution. Cluster distribution was mainly concentrated in the composition of Larix（70% ）and broadleaf species（ 30% ）to Lar/x（90% ） and broadleaf species（ 10% ）.