杉木人工林林窗特征因子与闽楠幼林生长关系的研究

Research on the Relationship Between Gap Characteristics of Cunninghamia lanceolata Plantations and the Growth of Gap Regeneration Phoebe bournei Seedlings

通过对福建明溪杉木人工林中16个林冠的林窗长轴和短轴及人工植苗3年生闽楠的保存率、地径和树高进行调查，分析林窗特征对闽楠植苗更新的影响。结果表明，影响闽楠幼林保存率和树高的林窗特征因子的主次排序为开阔度＞短轴＞长轴＞面积；影响闽楠地径生长因子的主次顺序为开敝度＞短轴＞面积＞长轴。林窗短轴、长轴、面积与开阔度等林窗特征因子与闽楠保存率、树高与地径生长均存在显著性的开口向下的二次抛物线方程的线性关系。综合闽楠幼林保存率、树高和地径生长表现，林窗短轴的理想的取值范围为5.10～6.26 m，合理取值范围为1.23～10.13 m；林窗长轴的理想的取值范围为7.37～7.88 m，合理取值范围为3.44～11.81 m；林窗面积的理想的取值范围为15.0～35.6 m2，合理取值范围为0～88.38 m2；林窗开阔度的理想的取值范围为0.429～0.507，合理取值范围为0.160～0.776。

16 canopy gaps in Cunninghamia lanceolata plantations forest and preserving rate,ground diameter, and tree height of 3-year old Phoebe bournei.plantation in mingxi,Fujian Province was investigated,and analyzed the effects of gap characteristics on planting regeration.The results showed that,in the order of affect on preserva-tion rate and height growth of P.bournei.seedlings,the order of gap characteristics factors was canopy openness〉gaps minor axis〉gaps long axis 〉gap size.In order of affect on seedlings ground diameter,it was canopy open-ness〉gaps minor axis〉gap size 〉gaps long axis.There was a significant downward opening quadric parabolic relationship between canopy openness,gaps minor axis,gaps long axis,gap size and seedlings preservation rate, height,ground diameter.Comprehensive preservation rate,tree height and diameter growth performance,ideal gaps minor axis was range of 5.10 -6.26 m,reasonable ranges was of 1.23-10.13 m.Ideal gaps long axis was range of 7.37 -7.88 m,reasonable was range of 3.44 -11.81 m.Ideal gap size was range of 15.0 -35.6 m2, reasonable was range of 0 -88.38 m2.Ideal canopy openness was range of 0.429-0.507,reasonable was range of 0.160-0.776.