樟子松母树林疏伐密度研究

Thinning Density about Pinus sylvestris Seed Trees

通过对孟家岗林场40年生樟子松母树林不同密度疏伐处理后14个主要性状的统计分析,结果表明,疏伐处理对樟子松母树多个性状造成了显著影响,而且不同性状之间存在极为复杂的相关性;利用聚类分析和主分量分析法将存在显著差异性和相关性的8个性状分成3类,分别代表了生长、树冠和结实性状;通过这3类性状在各主成分上得分值的加权和比较表明,孟家岗林场40年生樟子松母树林疏伐抚育最佳密度是150株·hm-2。

Fourteen main characters of the 40-year-old Pinus sylvestris vat. mongolica seed trees were analyzed after thinning treatments with different densities in Mengjiagang forest farm. Result shows that： forest thinning cause significant effects on many characters of Pinus sylvestris var. mongolica seed trees ;different traits have extremely complex correlation. Eight traits which exist significant differences ＆ correlation are divided into three categories （representing a growth, crown and seed traits） by using cluster analysis and principal component analysis. Weighting of scores and comparison of three classes of traits on each principal component show that the optimal thinning tending density of 40-year-old Pinus sylvestris var. mongolica seed trees in Mengjiagang forest farm are 150 trees · hm-2.