北缘地区发展柑桔生产,普遍存在着冻害的威胁。我国1976—1977年受冻柑桔达1,400万株,占受冻产地总株数的72.3％。湖北、湖南、江苏、江西、安徽等省,减产达到50—80％。可见冻害对柑桔生产威胁之大,因此,寻求避冻途径,探讨有效防冻新措施,以减少冻害造成的损失,具有重要的现实意义。 在当前世界常用的避冻措施中,最主要的是大区地形(高大山脉及其走向,大水体 The development of citrus in the northern margin of the region, the prevalence of frost damage threat. The number of frozen citrus in China from 1976 to 1977 reached 14 million, accounting for 72.3% of the total number of frozen areas. Hubei, Hunan, Jiangsu, Jiangxi, Anhui and other provinces, cut production reached 50-80%. It can be seen that the frost damage poses a great threat to the production of citrus. Therefore, it is of great practical significance to find ways to avoid frost and to explore new measures for effective frost protection so as to reduce the losses caused by frost damage. In the current world commonly used measures to avoid freezing, the most important is the regional topography (high mountains and their movements, large bodies of water