１地上部分更新对过早衰退树树冠内部的衰弱枝、密生枝、枯枝、重叠枝和病虫害枝进行疏剪，促进新梢生长。剪除生势衰退树顶部径粗为２～４ｃｍ的弱枝、“扫把枝”、老花枝。压顶枝条不要留桩，以防产生徒长枝条，扰乱树形。对生势衰退树外部径粗为０．５～０．８ｃｍ的衰退结 1 above-ground part of the regeneration of the premature decline tree canopy within the weak branches, dense branches, dead branches, overlapping branches and pests branches pruning to promote the growth of shoots. Cut off the recession-prone tree at the top of coarse diameter of 2 ~ 4cm weak branches, “broom branches”, old flowering branches. Pressure top branches do not stay piles, in order to prevent the growth of leggy branches, disrupting the tree. The decline of the recession tree outer diameter coarse 0.5 ~ 0.8cm recession