勃利县通天一林场从1982年开始对落叶松人工林进行不同带宽的皆伐更新试验。1985年开始大面积推广30m等带皆伐更新,到1991年完成30m等带皆伐更新面积2324亩。经过10年的培育与观测发现,在不同宽度皆伐带上生长的幼树立地条件相同,林龄相同,培育方式相同,而在胸径、树高生长上均表现各异。为了究其原因,于1990年开 Boli County Tongtiananyuchang from 1982 on larch plantation different width of the clear cutting update test. In 1985, large-scale popularization of 30m and other areas with clear-cut updates, to complete the 30m in 1991 with an area of ​​2,324 acres of clear-cut renovation. After 10 years of nurturing and observation, young trees grown on clear cuttings with different widths had the same site conditions, the same age, the same cultivation methods, but all showed differences in DBH and tree height growth. In order to study the reason, opened in 1990