我场自1971年开始引种毛竹,共20亩。在正常年景下生长良好,目前都已郁闭成林,每亩600株左右,最大株高8米,围径22厘米,挺拔碧绿,郁郁葱葱。但在极端低温情况下,冻害严重,如去年1月最低气温-16℃,毛竹发生冻害的占40％,受害严重的整株死亡。经调查看出,在同样气候条件下,在沙壤土上的毛竹冻害比粘壤土上的严重,这是因为在相同气温条 My field since 1971 introduced bamboo, a total of 20 acres. In normal years under the well-growing, at present have been closed forest, per acre 600 or so, the maximum height of 8 meters, diameter 22 cm, erect green, lush. However, in the case of extremely low temperatures, frost damage is severe. For example, the lowest temperature in January last year was -16 ° C, and 40% of the mosquitoes suffered from freezing damage and the whole plant was seriously injured. The survey shows that, in the same climate conditions, sandy loam damage on sandy loam than clay loam soil, which is because the same temperature bar