次生林内胡桃楸人工更新技术

Artificial regeneration technique of Juglans mandshurica in secondary forests

在水曲柳、胡桃楸和黄菠萝次生林内,对选择的优良单株进行营养空间弱度、中度和强度调控后的林下和林隙内人工更新胡桃楸。试验表明,林龄2年,在强度和中度营养空间调控林下人工更新胡桃楸效果良好,树高增长25.0%、10.4%,冻害率低,冻害长度小;在林隙内人工更新胡桃楸,幼树生长、冻害与林隙面积关系密切,林隙70 m2、50 m2,胡桃楸幼树树高增长25.0%、22.7%,冻害率30.4%、6.7%,冻害长度10.1 cm、3.0 cm,人工更新胡桃楸林隙面积50 m2左右较为适宜。

Artificial regeneration of Juglans mandshurica had been done in the forest and gap in which the nutritive space of the superior single plant had been adjusted by weak,moderately and intensity in the Shui Hu Huang secondary forests of Yichun forest.The results showed that the artificial regeneration of J.mandshurica was good in the two-year-old stands in which nutritive space was adjusted by intensity and moderately,and the height of young trees was increased by 25.0% and 10.4% respectively with a lower of freeze injury rate and a smaller of frost damage.In forest gaps,the growth and freeze injury rate of young J.mandshurica trees were closely relationship with the gap areas.When the gap area was 70 m2 and 50 m2,the young tree height was increased by 25.0% and 22.7%,respectively,the freeze injury rate was 30.4% and 6.7%,and length of frost damage was 10.1 cm and 3.0 cm respectively.Therefore,the appropriate gap area was 50 m2 for the artificial regeneration of J.mandshurica.