一、适宜条件。 1、复层异令林或近复层异令林; 2、中小径木多; 3、伐前平均每公顷八公分以上的目的树种等于或多于五百株(幼苗、幼树不作考虑。即使它们不多,只要中小径木多,那么在作业后通过人工促进措施,是可以达到良好的更新效果的); First, the appropriate conditions. 1, stratified atopy or near stratified anomaly forest; 2, a small number of trails and more; 3, before cutting an average of more than eight centimeters per hectare is equal to or more than five hundred species (seedlings, young trees are not considered. Even if there are not many of them, as long as there are more trails in wood, it is possible to achieve a good updating effect through manual promotion measures after work;