论文部分内容阅读
16年生杂交杨(populas.sp)林砍伐后的一个生长季节里,对100个伐桩进行疏芽,保留健壮条:将另100个伐桩作为对照。3个生长季节后,每一疏芽和未疏芽伐桩在萌芽的数量或健壮条的直径上没有明显差异。未疏芽伐桩上的健壮条明显较高。杂交杨砍伐后进行疏芽是不必要的。杂交杨砍伐后,其伐桩的地上茎和地下茎可萌发大量的新萌条。这些萌条只需几年的时间就可成材(达维德森和达维斯1972) ,但要经过长期的竞争。为了检验疏芽是否能促进壮条生长,我们在宾夕法尼亚的一块近期砍伐迹地上进行了一次研究。
In a growing season after 16-year-old Populas sp. Deforestation, 100 spiked stalks were sprouted and robust bars were retained: another 100 stumps were used as a control. After 3 growing seasons, there was no significant difference in the number of sprouts or the diameter of sturdy spruce between each sprouted and non-sprung stump. Unplugged spiked pile on the sturdy bar was significantly higher. Hybrid poplar sprouting after deforestation is not necessary. After the hybrid poplar cuttings, the underground stalks and underground stems of its cutting pile can germinate a large number of new sprouts. These sprouts can be made in just a few years (Davidson and Davis 1972), but with long-term competition. To test whether sprouted buds can promote strong growth, we conducted a study on a recent deforestation plot in Pennsylvania.