黄山松群落林隙光能效应与黄山松的更新

研究安徽黄山海拔１４００～１６００ｍ垂直带自草甸发育的黄山松林分的林隙，采用林隙周边树木年轮生长序列分析方法来推测林隙形成的时间，结果表明林隙形成与更新发生的时间基本相近。通过对林隙太阳辐射日变化的动态观测，建立了林隙中不同接受辐射总量及光合有效辐射与林冠空隙面积、扩展林隙面积、扩展林隙上方树冠郁闭状况的相关模型。结果表明，在观测时间段内，林隙中心点的总辐射量与光合有效辐射分别为全光照条件的９０％

Light effect of gaps in Huangshan pine community and regeneration of Huangshan pine

This paper dealt with the gaps of Huangshan pine(Pinus taiwanensis) forest developed on the meadow of 1400-1600 m above sea level of Huangshan Mountain. The method of analyzing annual ring growth of pine trees surrounding gaps was employed to estimate the time of gap formation, which was almost the same as the regeneration occurred there. The dynamic variations of total radiation and photosynthetic available radiation(PAR) at different points in gaps were measured, and a regression model for their estimation based on gap size, expanded gap size and canopy closure situation overhead the extended gap was established. The results indicated that the total radiation and PAR were respectively 90% and 71% of full sunlight in gap center, and 30-40% and 25-33% in expanded gaps, while the light under canopy was less than 10% of full sunlight. In the gaps with an area of 40 m2 or in the extended gaps with an area of 110 m2, the light might basically satisfy the growth of the pine, and the gap regeneration could occur. It is suggested that man-made gaps could be made to facilitate the regeneration of Huangshan pine, which could be used as a management approach for Huangshan pine forests, and also for maintaining the landscape in beauty spots of Huangshan Mountain.