CAJ | 학술논문

采用Hegyi单木竞争指数模型对闽北地区3-5年生杉木-千年桐混交林及杉木纯林的种内种间竞争强度进行定量分析。结果表明，杉桐混交林的竞争强度均高于同龄纯林，随林龄增长，竞争强度逐渐减弱。杉桐混交林中以杉木之间的种内竞争为主导。无论纯林还是混交林，对象木受到的竞争强度基本随径级的增加而减少。杉木对象木的胸径大小与杉木种内、杉桐种间的竞争强度呈幂函数关系，其胸径大小与竞争强度之间呈现显著的负相关关系。由预测结果可知，当杉木胸径达到30 cm后，林分竞争强度趋缓。
채용Hegyi단목경쟁지수모형대민북지구3-5년생삼목-천년동혼교림급삼목순림적충내충간경쟁강도진행정량분석。결과표명，삼동혼교림적경쟁강도균고우동령순림，수림령증장，경쟁강도축점감약。삼동혼교림중이삼목지간적충내경쟁위주도。무론순림환시혼교림，대상목수도적경쟁강도기본수경급적증가이감소。삼목대상목적흉경대소여삼목충내、삼동충간적경쟁강도정멱함수관계，기흉경대소여경쟁강도지간정현현저적부상관관계。유예측결과가지，당삼목흉경체도30 cm후，림분경쟁강도추완。
The intraspecific and interspecific competition intensities (CI) of 3-5 years′mixed stands of Cunninghamia lanceolata and Aleurites montana and pure stands of Cunninghamia lanceolata in northern Fujian were quantitatively analyzed by Hegyi single-tree competition index model.The results showed that compared with even-aged pure stands, mixed stands had higher CI, and the CI reduced with stand growing.The main competitive stress came from intraspecific competition in the mixed stands.The CI decreased with the increase of diameter scales in both pure and mixed stands.The relationship between CI and DBH of the target trees followed the relationship of power function and there was a significant negative correlation between CI and DBH of the target trees.The model prediction indicates that the CI in the stands reduces greatly with smaller amplitude when DBH of C.lanceolata reaches 30 cm.