林谚说：大树移活，要带冰坨。秋季树木落叶后，当我国北方开始结冻时，将树冠进行适当修剪，把不必要的枝条剪去，降低树叶水分的蒸腾和养分的消耗。然后在树根周围约50厘米处挖深沟，沟围的直径大小相当于树干地径的4—5倍，如树干地径为20厘米，沟围直径需0.80米—1米左右。 Lin proverb said: tree move, to bring ice lump. After the autumn leaves fall, when the northern part of our country begins to freeze, the canopy is properly pruned to cut off unnecessary branches and reduce the transpiration of water and nutrient consumption. Then ditch the ditch about 50 cm around the root, the diameter of the ditch is about 4-5 times the diameter of the trunk, for example, the diameter of the trunk is 20 cm and the diameter of the ditch is about 0.80 m -1.