Tuesday, January 5, 2010

什么样的树冬天需要包起来?

冬季来临的时候,走在街上,总会发现很多树被人为地包了起来,这究竟是为什么呢?难道他们也象人一样需要穿上衣服吗?

其实,把树包起来的原因是防止冬天的大雪把树枝压断,而不是因为怕温度过低把树冻死。

知道了原因,就很容易知道什么样的树需要包起来了,大致有3个条件,

1,一定的高度
太矮的小树是不需要这个的,因为大雪落到地下本身就可以支撑树枝

2,常绿的树
落叶的树木,因为没有叶子,落在树上的雪有限,不会对树枝造成伤害

3,树枝和主干角度过小
树枝和主干的角度越大,树枝就越结实,如果你去果园摘过苹果,你一定见过树枝和主干几乎成直角的果树,这就是果园从小培养的结果。

这棵树(spruce)的角度很大,不需要用布包起来,


这棵树(Arborvitae )明显角度很小,需要保护

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