一、前言华南大陆(含广西、广东、云南、福建)垦区引种的热带作物越冬的主要矛盾,是冬季寒潮低温的强度,而不是年均温的高低。由于华南大陆多为山地(丘陵),其南部为南亚热带地区,冬季受北方寒潮南下影响,不但寒潮性质(分平流型与辐射型)路径多变(有东、中、西三路),而且受大、中、小地形对冷空气低温、风况,一日照等的再分配作用(局部削弱或加强空气的降温能力和增大风速、减少日照等),又出于大地形的屏障作用,就出现了同一纬度的低温程度 I. Preface The main contradiction of the tropical crops introduced in the reclamation areas of South China (including Guangxi, Guangdong, Yunnan and Fujian) overwinter is the intensity of the cold in winter but not the mean temperature in cold season. Due to the fact that the southern China is mostly mountainous (hilly), its southern part is in the south subtropical zone. In winter, due to the influence of the north cold wave in the south, not only the cold-surge nature (stratified flow pattern and radiation type) varies (the east, middle and west roads) By the large, medium and small topography of cold air temperature, wind conditions, such as the role of day redistribution (locally weaken or strengthen the air cooling capacity and increase wind speed, reduce sunshine, etc.), and out of the barrier effect of the terrain, It appears the same latitude of the low temperature level