A poem about the influence of land and sea position on phenology

China is a vast country, with a distance of 5,000 kilometers between north and south. The phenology of mountains and plains is different, the south and north are different, and the east and west are different. From the poems sung by poets in past dynasties, we can see that phenology varies from place to place, from time to time, and there are great differences in phenology.

Qinling Mountain is the watershed between the Yellow River and the Yangtze River in geography and the dividing line between temperate zone and subtropical zone in climate. Many subtropical plants, such as bamboo and citrus, can only grow in the south of Qinling Mountains. Ancient poets have realized this difference between North and South. Su Shi was born in Sichuan. He is a southerner and is used to eating bamboo. In the seventh year of Jiayou (A.D. 1062), on his way from Baoji, Shaanxi Province to Sichuan, he passed through Shibi Town (now wucheng town) and wrote the poem Yong Shibi Town:

Walking alone in the hazy moonlight, I am anxious to rush to the endless river.

Gradually entering the southwest, the scenery changes, and the bamboo forest gurgles along the road.

Yuanfeng three years (AD 1080), demoted Huangzhou Yingyong, Huangzhou Yingyongchu, and sang:

All over the Yangtze River, fish is beautiful, bamboo is good, mountain is fragrant.

It can be seen that bamboo is very common in the south. Bamboo is indeed a good sign of different phenology between the north and the south. Du Fu also wrote this poem when he entered Sichuan in his later years:

There are more than one hectare of bamboo, and trees are in the sky.

But there are few bamboos in the north. Bai Juyi came to Jiangxi from Chang 'an and wrote the poem "Three Questions of Xunyang". In the preface of the poem, he wrote: "There are many things in Songpu that cultivate bamboo ... these things are cheap and worthless to southerners." In his poem "Songpuzhu":

I heard that bamboo with gold powder is as heavy as jade.

Bai Juyi saw that bamboo is so common in the south and lamented that bamboo in Jinfen (now Shanxi) is as heavy as jade. Bamboo is indeed a sign of different phenology between north and south.

Guo Moruo's poem "Magnolia Apricot Tree" is unpretentious, and it also describes the phenological differences between North and South:

Two months ago, in Guangzhou, I saw magnolia in full bloom;

Two months later, in Beijing, I saw magnolia again.

Magnolia, I said, you walk too slowly!

It took you two months to get to Beijing.