长白山林区天然次生林胡桃楸的适宜生长空间

利用次生林主林层胡桃楸34株平均木(胸径为11.0～39.1 cm)的树干解析数据,结合反映植物生长空间的冠幅,进行5,10和15年抚育间隔期的单株材积定期生长量、林分蓄积增长量与生长空间关系的研究,建立不同抚育间隔期胡桃楸胸径与适宜生长空间关系的模型;利用林冠下层27株胡桃楸平均木(胸径为4.6～14.3 cm)的树干解析数据,评价适宜生长空间模型应用于被压状态胡桃楸时的生长促进效果.结果表明:1)3参数S型曲线模型和二项式模型分别能够很好反映胡桃楸前5,10和15年间单株材积定期生长量、林分蓄积增长量与冠幅的关系;2)不同抚育间隔期胡桃楸胸径与适宜生长空间关系的模型为幂函数模型(y=a×x~b);3)对数函数模型(y=a×ln(x)+b)能显著反映适宜生长空间下胸径与材积定期生长量的关系;4)适宜生长空间下胡桃楸5,10和15年材积定期生长量至少比生长空间受限条件下的林木提高97.8%,114.4%和128.5%.采用5,10,15年抚育间隔期时,不同胸径胡桃楸的适宜生长空间分别是相应胸径的0.256 6～0.368 7,0.344 1～0.447 1和0.449 1～0.504 6倍.

Optimal Growing Space for Juglans mandshurica in Second Growth Forests in Changbai Mountains

In order to scientifically manage Juglans mandshurica, combined with its crown width reflecting growing space, the relationship between growing space and individual, stock volume periodic increment of 5, 10 and 15 years' interval for bringing up Juglans mandshurica in second growth forests of Changbai Mountains was studied based on the 34 analytical trees (DBH 11.0 ～39.1 cm) growing in canopy layer. Regression models of optimal growing space in different upbringing intervals to DBH were constructed. Based on analytical data from 27 trees (DBH 4.6 ～ 14.3 cm) growing in understory, optimal growing space models for growing trees in understory were established to evaluate nurturing effects. The 3-parameter sigmoid models and quadratic models were able to well describe the relationship between individual, stand periodic volume increment to crown width of Juglans mandshurica, respectively. The power models could significantly describe the relationship between optimal growing space in different upbringing intervals to DBH of Juglans mandshurica. The logarithm models could significantly describe the relationship between periodic volume increment to DBH of Juglans mandshurica growing in optimal growing space. The periodic volume increments of J. mandshuria in 5, 10 and 15 years' interval growing in optimal growing space at least increased 97.8% ,114.4% and 128.5% , respectively compared with the suppressed space. The ratioes of optimal growing space (m) for bringing up Juglans mandshurica in 5, 10 and 15 years' interval to DBH (cm) was 0.256 6 ～ 0.368 7, 0.344 1 ～ 0.447 1, and 0.449 1～0.504 6, respectively.