不同造林密度和混交树种对光皮桦幼林生长的影响

The effect of different afforestation density and mixed tree species on young plantation of Betula luminifera

通过对光皮桦不同造林密度、不同混交树种的试验研究,结果表明:光皮桦不同造林密度林分的生长有较大差异,其胸径、冠幅由大到小依次为:1 100株.hm-2、800株.hm-2、1 600株.hm-2、2 500株.hm-2,树高以1 100株.hm-2的林分最大,其余比较相近。光皮桦与不同树种混交生长有较大差异,各生长指标以杉木×光皮桦混交林最好,其余依次为:福建柏×光皮桦、木荷×光皮桦、马尾松×光皮桦;光皮桦纯林生长指标与福建柏光皮桦混交林比较接近。杉木×光皮桦和福建柏×光皮桦是较好的混交组合。

Based on the study of different afforestation density and mixed tree species of Betula luminifera, the results show there are significant differences in stand growth among different afforestation density. The sequence from big to small of B. luminifera in DBH and crown size is as follows： 1 100,800, 1 600, 2 500/hm^-2, but in tree height is the biggest with the density of 1 100/ hm^-2, and others are nearly same. There are significant differences in stand growth among different mixed tree species. At all growth indexes, Cunninghamia lanceolata×B. luminifera is the best one, and the next is： Fokienia hodginsii×B. luminifera, Schima superba×B. luminifera, and Pinus massoniana×B. luminifera. The growth indexes of B. luminifera pure plantation is close to that of Fokienia hodginsii×B. luminifera. The better mixed forests are Cunninghamia lanceolata×B. luminifera and Fokienia hodginsii×B. luminifera.