天然林冠下红松被压木极限生长形态学指标的研究

通过研究１００株原始红松林内树高小于１４ｍ的红松解析木，分析了林下红松生长类型，林下红松生长与上层结构因子的关系，林下红松的形态特征及生理特性，结果表明，林下红松生长可划分为恒定型、下降型和上升型。被自然淘汰的林下红松皆属于恒定型和下降型。林下红松的生长受上层林冠结构因子的制约，没有合适的结构条件，林下红松很难存活。研究得出了天然林冠下红松被压木能够上升到上层林冠所需胸径、树高、树冠面积、边材宽、冠长／树高等形态学指标的最低极限值。

Study on the Morphological IndexThreshold for Korean Pine Growth under Natural Canopy

Through study on 100 korean pine sample trees less than 14m in virgin korean pine forest , the growth type, relationship between growth and upper structure factors , the morphology feature and physioiogical feature of korean pine under canopy are analyzed. The results show that the growth of korean pine under canopy can be classified to constant type , descend type and ascend type. All the eliminated korean pine under canopy is belong to con- stant type and decend type. The growth of korean pine under canopy is restricted by the up- per canopy structure factors. It is not easy for korean pine under canopy to live if there is not suitable structure condition. The lowest morphological index threshold of diameter height , canopy area, sap width, rate of canopy length to height for korean pine under canopy growth to upper canopy are obtained.