进入夏季,强对流天气逐渐增多,一些园林树木的主枝在大风吹袭下,极易出现劈裂,造成树木死亡或失去观赏价值。笔者在多年的实践工作中发现,主枝劈裂特别容易出现在合欢、法桐等木质较脆,长势相对较快的树木上。特别是合欢,发生劈裂的情况非常普遍。经观察发现,主枝留存不合适是最主要的原因。以合欢为例,树木定干后应该在 Into the summer, the strong convective weather gradually increased, some of the main branches of garden trees in the wind hit, prone to splitting, causing trees to die or loss of ornamental value. The author found in many years of practice, the main branch cleavage is particularly prone to Acacia, Fatong wood and other relatively brittle, growing relatively fast on the trees. Especially Acacia, splitting is very common. The observation found that the main branch is not suitable for the main reason. Take Acacia as an example, trees should be dry at