关键词: 可溶性糖, 可溶性糖

Abstract: The paper provided meteorological decision-making services for Korla pear cultivation by exploring temperatures elements of freezing injury occurring on the Korla fragrant pear trees in winter. Based on freezing injury investigation and temperature observations nearly 4 years in the wintering dormancy period of fragrant pear trees, the Shanghu Town orchards, the indicators were analyzed, including extreme low temperature, cryogenic duration and so on. The results showed that Korla fragrant pear trees had medium strength freezing injury in wintering dormancy period, 2010-2011, extreme low temperature measured was -28.1℃in orchards, and the duration of temperature below - 24℃was 9.5 hours in January 10. In 2011- 2012, extreme low temperature measured was -26.3℃, but the duration of temperature below -24℃was only 3 hours, therefore fragrant pear trees were not cold obviously. The results of freezing injury conditions nearly 4 years on Korla fragrant pear trees showed that the big intensity and high frequency of low temperature easily led to fruit damage, no or only trace snowfall in winter, freezing injury was not necessarily when temperature measured was lower than critical temperature of freezing injury, the duration of freezing injury temperature was the key in freezing injury weather, but put consecutive appearance days of freezing injury temperature as duration was not reliable. In addition, the occurrence time of low temperature in winter had influence on the degree of freezing injury.