For example, "the peach blossoms outside the bamboo are three or two, and the duck is the prophet of spring water heating." (Su Shi titled Hui Chong's Night Scene of the Spring River) In early spring, ducks first felt the spring water heating and played in the water.
"It's freezing, water birds depend on each other, and birds play with each other. When pedestrians can't stand it, they suddenly smell the ice ring in Qi Fei. " (Qin Guan Guangling returns) At the end of winter, water birds depend on each other, and birds fly with ice sound. Ducks and birds are messengers of spring.
"It rains at home in Huangmei season, and frogs are everywhere in the grass pond." There are three kinds of images in Zhao Shixiu's poem, which show the seasonal characteristics of plum blossom and Huang Shi in late spring and early summer.
Huang Chao wrote about chrysanthemums and said, "The west wind is rustling all over the courtyard, but cold butterflies are hard to come." Chrysanthemums wither and butterflies disappear. Although the word "autumn" is not used, the coolness of autumn comes to my face.
As for Li Bai's Song of Xia Sai, it leads readers into another world: "There is snow in Tianshan Mountain in May, but there are no flowers, only cold, and the willow is folded in the flute, and the spring scenery has never been seen." May is in midsummer, and it is already the day when all the flowers in the mainland are dying. However, Tianshan Mountain (Qilian Mountain), located in the northwest frontier, is still covered with snow, and there are no willow flowers, indicating that there is neither summer nor spring and autumn in the Yellow River basin with an altitude of more than 4,000 meters.
In ancient poems about phenology, we can often see the agricultural and military activities of our predecessors. For example, Fan Chengda's "Four Seasons Pastoral Miscellaneous Fun": "When butterflies enter cauliflower, they will be lawless for a long time." These two sentences are written in the rural areas of the south of the Yangtze River in late spring, and the description of butterflies entering cauliflower sets off the peasant women's busy farming. Let's look at Wen Tong's "Morning Light Clear to Baoenshan Temple": "The smoke is far away, the water is full of gulls, and the sun is high. The second part is about the busy scene of peasant women harvesting wheat, whole vegetables, picking mulberry and raising silkworms at the turn of spring and summer, which is kind and touching. The third piece of Lu Lun's Qu, "The moon is high, the geese fly, the Tatar leader flees in secret, I chase, the horse is light, and the bow and sword bear the snow", which is about marching and fighting: the enemy flees at night, and the geese fly in surprise, which arouses the vigilance of our generals and leads troops to chase the enemy, fully demonstrating the heroism of Chinese sons and daughters.