摘要
对35个以云杉、华山松、落叶松、桦类和阔杂为优势树种的混交林小班疏密度的计算结果表明,按优势树秆与分树种合计计算混交林小班疏密度之间的平均相对差异的绝对值为:云杉(25.63%)>阔杂(11.90%)>华山松(8.90%)>桦类(7.66%)>落叶松(1.73);同一优势树种,这种相对差异随优势树种组成系数的下降而呈增大的趋势。建议用分树种合计计算的方法准确、客观地得到混交林的疏密度。
The results show that the absolute values of mean relative differences of calculated density between the dominant species and sum of each species are Picea asperata(25.63%)>foliaged miscellaneous trees(11.90%)>Pinus armandi(8.90%)>Betula(7.66%)>Larix(1.73%), which are based upon 35 subcompartments of mixed forest composed of the dominant species those are Picea asperata,Pinus armandi,Larix, Betula and foliaged miscellaneous trees respectively.When the dominant species are the same,the relative differences tend to increase as coeffi- cients of composition for dominant species coming down.It is proposed that application of calculation method of sum of each species obtain the density of mixed forest accurately and objectively.
出处
《陕西林业科技》
北大核心
1992年第1期32-35,共4页
Shaanxi Forest Science and Technology
