The relationship between spatial structure and DBH of close-to-nature Phyllostachys edulis stands in Tianmu Mountain

Tree diameter structure is an important and basic role in forest structure. For the reason that the diameter at breast height (DBH) can be easily and accurately measured. Because it has a close relationship with variables such as stand density, tree age, tree height, canopy, biodiversity and so on, diameter structure is often used as a direct-response stand structure characteristic. DBH belongs to a set of non-spatial forest structure factors, and is frequently used to analyze the relationship between stand structure and growth, e.g. Previous studies rarely reported the relationship between moso bamboo stand spatial structure and diameter. The DBH was recorded into one of three classes: I class (DBH < 7 cm) , II class (7 cm [< or =] DBH < 13 cm), III class (DBH [> or =] 13 cm). The age mingling values showed the ranking of age segregation was: III [>] II [>] I. The age mingling of different diameter classes was also significantly different.