Study on Seedling Regenera tion of Arbor and Shrub in Logg ing Gaps inPopu lus davidiana-B e tu la pla typhylla Secondary Forests in Changba iMounta in

SONG Xin-zhang; ZHANG Zhi-ting; XIAO Wen-fa; HUANG Zhi-lin; LIU Xiao-xin

Regeneration in relation to logging gap s sizes and ages was investigated in Popu lus david iana2B etulaplatyphy lla secondary forests in ChangbaiMountain. The research result showed that there were 7% ( canopy gap sarea 2 ) , 21% (50 - 100 m2 ) , 36% (100 - 150 m2 ) , 29% (150 - 200 m2 ) , 7% ( > 200 m2 ) in the p roportionof gap sizes. 28. 6% of gap s shape were rotundity and 71. 4% were oval. 55% of the oval gap s lay in N2Sdirection, 30% lay in N2E to S2W direction and 15% lay in S2E to N2W direction. Gap swere usually formed after7 - 10 trees logged which were mainly composed of Populus david iana, B etu la platyphy lla andM aackia am urensis.The seedlingswas absolutely dominated by the shrub at the initial stage of logging gap s, but the dominance of theshrub seedlings would weaken step by step. At the same time, the advantage of arbor seedlings would raisecorrespondingly with the increasing gap s age. The density, mean high and mean basilar diameter of seedlingsgrowing in the logging gap swere higher than those in non2gap. The growth of seedlingswas the best in 100 - 200 m2gap s and arbor seedlings surpassed shrub seedlings in gap s excep t 50 - 100 m2 gap s. The dominance speciesmainlycomposed of intolerant species were different in gap s of different sizes.

1. International Research Center of Spatial Ecology and Ecosystem Ecology, Zhejiang Forestry University, Hangzhou　311300, Zhejiang, China

2. Research Institute of Forest Ecology, Environment and Protection, CAF

3. Key Laboratory of Forest Ecology and Environment, State ForestryAdministration, Beijing　100091, China

4. College of Forestry,AgriculturalUniversity of Hebei, Baoding　071001,Hebei, China

Received Date: 2006-10-10

Abstract: Regeneration in relation to logging gap s sizes and ages was investigated in Popu lus david iana2B etulaplatyphy lla secondary forests in ChangbaiMountain. The research result showed that there were 7% ( canopy gap sarea 2 ) , 21% (50 - 100 m2 ) , 36% (100 - 150 m2 ) , 29% (150 - 200 m2 ) , 7% ( > 200 m2 ) in the p roportionof gap sizes. 28. 6% of gap s shape were rotundity and 71. 4% were oval. 55% of the oval gap s lay in N2Sdirection, 30% lay in N2E to S2W direction and 15% lay in S2E to N2W direction. Gap swere usually formed after7 - 10 trees logged which were mainly composed of Populus david iana, B etu la platyphy lla andM aackia am urensis.The seedlingswas absolutely dominated by the shrub at the initial stage of logging gap s, but the dominance of theshrub seedlings would weaken step by step. At the same time, the advantage of arbor seedlings would raisecorrespondingly with the increasing gap s age. The density, mean high and mean basilar diameter of seedlingsgrowing in the logging gap swere higher than those in non2gap. The growth of seedlingswas the best in 100 - 200 m2gap s and arbor seedlings surpassed shrub seedlings in gap s excep t 50 - 100 m2 gap s. The dominance speciesmainlycomposed of intolerant species were different in gap s of different sizes.

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Reference (19)

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Study on Seedling Regenera tion of Arbor and Shrub in Logg ing Gaps inPopu lus davidiana-B e tu la pla typhylla Secondary Forests in Changba iMounta in

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