There were 1 1 snowfall in Guangzhou during the 400-year Little Ice Age in Ming and Qing Dynasties. There were 72 freezing disasters recorded in the Little Ice Age in Ming Dynasty and 277 in Qing Dynasty. At that time, freezing disastrous weather occurred in northern, western, eastern, central and southern Guangdong. Many freezing disasters occurred in Nanhai County, dapu county, Huilai County, Xingning County, Jieyang County and Longchuan County. During this period, the snow line in Guangdong even reached the northern coastal area of Hainan Island, where the temperature actually dropped below zero. 1606 (thirty-four years of Wanli in Ming Dynasty), Qiongshan in Hainan was extremely cold in winter, and six animals froze to death; 1767 (thirty-two years of Qianlong) Frost in Wanning, Hainan-It should be hard to imagine for countless "migratory birds" who came to Hainan from the north to warm up for the winter. It is particularly noteworthy that during the period from 1245 to 1924, the main freezing disaster in Guangdong was snowfall, followed by rain and snow frost. It can be seen that snow is not uncommon for Guangdong. The snowfall in this Little Ice Age was recorded directly, with at least 1 1 time in Guangzhou,1time in Leizhou Peninsula and 17 times in Hainan Island-Hainan Island is more than Guangzhou!

Second, the tactics of keeping out the cold in history: smoking method, ridging method and wrapping method.

For Cantonese who are used to warm life, those snowy days in history are often expensive. So people invented all kinds of indigenous methods. For example, the smoking method, that is, burning firewood, straw, dead branches, fallen leaves, dry dung blocks and other smoke, releases smoke screens, weakens the effective radiation on the ground and raises the temperature. This method was first seen in Qi Yao Min Shu in the Northern Wei Dynasty. Another example is the method of cultivating soil, which is to cultivate the soil to take root before the arrival of freezing weather, so as to loosen the soil, raise the soil temperature and protect the root system. The method of cultivating soil is mostly used for fruit trees to prevent cold. For example, in Han Yanzhi's citrus monograph "Orange Record", "winter river mud bacon" was recorded. The parcel law is no stranger to modern city people. This method is mostly used for wintering and cold protection of trees, and it is still widely used in modern garden tree management, but it is time-consuming and laborious and inefficient. In the Qing Dynasty, Zhang Zongfa wrote in Saint Ji Nong: Olives "like cold, so it is appropriate to tie velvet grass in winter"; Longan "its tree is afraid of winter, it must be covered with velvet, and its stalk is tied with grass and thick as a square", which is a very practical experience for Guangdong.

But after all, artificial defense can only stop temporary emergencies, and the change of climate is irreversible. During the Little Ice Age of Ming and Qing Dynasties, the distribution boundary of litchi, coconut and betel nut gradually moved southward. Many places in Fujian and Guangxi are no longer suitable for planting litchi after this period.

After the Little Ice Age in Kunming, Yunnan, the elephants gradually retreated to Xishuangbanna. In Qionghai, Hainan Island, according to the information of plant remains, mangroves reached the growth peak around 1486, and then gradually decreased, indicating that the weather became cold. The growth of coral reefs that need warm climate nourishment has also been inhibited.