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前言 低温冻害是宁夏果树生产中常见的自然灾害。据一些老人回忆和资料记载,在过去的80年间宁夏曾发生过4次大的果树冻害。其中最早的一次可追溯到1929年11月发生的一次大寒潮,使沙果、梨、枣、桃大树几乎遭到毁灭性冻害;1956年冬季严寒,使3-8年生苹果幼树越冬死亡率达50-70％以上;1967年11月寒潮,使芦花台园林场果树受冻80％。7年生树因冻害整株死亡30％以上;1976年11月13日的强寒流,最低气温下降到-13.4℃,使平罗园艺场冻死6年生苹果树600多株;
Preface Low-temperature frost damage is a common natural disaster in the production of fruit trees in Ningxia. According to some elderly memories and data records, in the past 80 years, there have been 4 large fruit cold damage in Ningxia. The earliest of these was a large cold wave dating back to November 1929, causing nearly complete destruction of the sandy, pear, jujube and peach tree frosts; the cold winter of 1956 caused the death of 3-8 year-old apple trees overwintering The rate of 50-70% or more; November 1967 cold wave, so that the fruit trees Luhuatai garden frost 80%. 7-year-old tree frost damage to the whole plant died more than 30%; November 13, 1976 the strong cold, the minimum temperature dropped to -13.4 ℃, Pingluo horticultural field frozen dead 6-year-old apple trees more than 600 strains;