不同密度30年生马尾松林分生产结构与现存量的研究

Studies on the Production Structures and Present Stocking of 30-Year-Old Pinus massoniana Stands with Various Densities

对不同密度３０年生马尾松人工林调查的结果表明：平均胸径随立木密度的增大而减少，平均树高受立木密度的影响较小；干、枝、叶和根等林分现存量随立木密度的增大而减少；单位叶量的材积生产力随立木密度的增大呈抛物线状态。

The survey results of 30- year-old Pinus massoniana Plantations with various densities reveal that the average d. b.h. decreases with the increase of standing tree densities:the effects of standing tree densities on the average height are smaller:the present stand stocking of stems,branches,leaves.etc. decreases with the increase of standing tree densities : and the volume produc- tivity of unit leaf numbers assumes the parabolic status with the increase of standing tree densi- ties.