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一、问题的提出:在我国北方,果树春季开花、夏季结实原是自然界的一种正常现象。但在异常气候条件下,果树可以在秋季开花,虽能座果,因冬季很快来临,生长期短,不能成熟,这种现象俗话叫做二次花。因为这是自然界的一种异常现象,有心的古代人常常认真的把它们记载下来来,叫做秋花冬实,以附会社会上人事变迁的吉凶。但是,这些在科学还不是十分发达时期的资料,却成为研究古代社会气候情况的宝贵遗产。例如根据二次花的现象来考证我国古代
First, the issue put forward: In northern China, fruit trees flowering in spring, summer is a natural phenomenon in nature. However, under abnormal climatic conditions, fruit trees can bloom in autumn, although the fruit can be fruitful. Due to the rapid arrival of winter, the growth period is short and it can not mature. This phenomenon is called secondary flowers. Because this is an anomaly in nature, the ancients often carefully recorded them down and called Qiuhua Dongshu, in order to attach importance to the vicissitudes of personnel in society. However, these materials, which were not well developed in science, have become valuable historical sites for studying the ancient social climate. For example, according to the phenomenon of secondary flowers in ancient China