论文部分内容阅读
上海地处柑桔栽培北缘地区,冻害是桔园的最大威胁。据上海中心气象台1873年至今106年的气象资料,上海市极端最低温度为-12.1℃(出现在1893年1月19日),-10℃以下低温(柑桔有冻死威胁)出现过十年,平均约为十年一遇;-9℃以下低温(桔树骨架受冻)出现过十九年,频率为17.9％,约平均每隔五年一次;-7℃以下低温(叶片受冻)频率高达58.6％,也就是说柑桔叶片有半数以上年份都要受冻害影响。
Shanghai is located in the northern edge of citrus cultivation, frost damage is the biggest threat to Orange Park. According to the meteorological data of the Shanghai Central Meteorological Observatory from 1873 to the present 106 years, the extreme minimum temperature in Shanghai is -12.1 ° C (appeared on January 19, 1893), and -10 ° C (-10 ° C) , An average of about 10 years once; below -9 ℃ below the temperature (orange tree frost) appeared nineteen years, a frequency of 17.9%, about an average of once every five years; -7 ℃ below the low temperature (leaf frost) Frequency up to 58.6%, which means that more than half of the citrus leaves are affected by the cold damage.