The results showed that the size of all gaps varied from 22.75 to 319.92 m2 and had an average area of 102.3 m2; most gaps ranged from 50 to 200 m2 in size; the gaps of 50-100 m2 took up the largest percentage in number and area.

• 结果表明；在安曹下杉木林中；林窗的面积为22.；75-319