在９年生的杉木人工林中，设立抚育间伐方法试验标准地。试验处理为上层疏伐、下层疏伐、综合疏伐、机械疏伐和对照５种。于１９７５年、１９７８年、１９８２年、１６８６年分别测定了各标准地的大小因子。分析结果表明，各种疏伐方法对林分生长和产量的影响显著不同，杉木幼林首次疏伐时，机械疏伐效果最好。 In a 9-year-old Chinese fir plantation, a test standard for tending thinning methods is established. The treatments were upper thinning, lower thinning, comprehensive thinning, mechanical thinning and comparison. In 1975, 1978, 1982, 1686 were measured for each standard size factor. The results showed that the effects of various thinning methods on the growth and yield of stand were significantly different. The effect of mechanical thinning was best when young Chinese fir was thinned for the first time.