杉木为我国特有的用材树种生长快,材质好,用途广,产量高,深受山区群众欢迎。但是,当第一代杉木成熟采伐后,在采伐迹地上栽植杉木,就有部分林地出现“僵苗”现象———主梢不长,根系萎缩。究其原因主要是,由于连片营造大面积、高密度杉木同龄纯林整地、栽培、抚育措施失当,引起? Cunninghamia lanceolata timber for our unique species grow fast, good material, wide use, high yield, welcomed by the mountains. However, when the first generation of mature Chinese fir harvesting, planted in the deforested land, there is a part of the woodland “stiff Miao” phenomenon - the main shoot is not long, the root atrophy. The main reason is that, as a result of contiguous to create a large area, the same age high-density fir plantation, planting, tending improper, causing?