[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.
Wu
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Z
School of Forest Utilization, Anhui Agricultural University, Hefei 230036. wuzemin@mail.hf.ah.cn
Huang
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C
Wei
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C
D002681:China; D017753:Ecosystem; D008027:Light; D010788:Photosynthesis / Q000528:radiation effects; D028223:Pinus / Q000502:physiology* / Q000528:radiation effects