论文部分内容阅读
以2a生苗为试材,对22种云杉的苗高生长节律进行测定,结果表明:22种云杉高生长均出现“慢—快—慢”的生长节律。通过Logistic曲线方程拟合,高生长进程的相关系数均达到0.91以上,方程回归性检验均达极显著水平(P<0.01),22种云杉的高生长进程呈明显的S型曲线。不同种云杉苗木高生长开始的时间与持续时间都存在较大的差异,造成苗木所积累的高生长存在差异。通过聚类分析选择出速生种长叶云杉、欧洲云杉、黑云杉、丽江云杉、蓝云杉、川西云杉、西藏云杉、粗枝云杉等8种云杉。
The growth of 22 spruce seedling height rhythms was determined using 2a seedlings as test material. The results showed that the growth rhythms of 22 species of spruce appeared “slow - fast - slow”. The logistic curve fitting showed that the correlation coefficient of the high growth process reached above 0.91, and the regression equation of the equation reached the extremely significant level (P <0.01). The growth process of 22 spruce showed a sigmoid curve. Different types of spruce seedlings height growth start time and duration there is a big difference, resulting in the accumulation of seedlings have high growth differences. Eight kinds of spruce including fast-growing long-spruce, European spruce, black spruce, Lijiang spruce, blue spruce, western Sichuan spruce, Tibetan spruce and coarse spruce were selected by cluster analysis.