The significance of phenology
Phenological knowledge:
Using phenology knowledge to guide the research of agricultural production has developed into a science called phenology in all countries of the world. Similar to climatology, phenology is a local science, which is to observe the passage of all seasons in various places and regions.
The difference is that climatology is to observe and record the changes of cold, warm, sunny and rainy weather in a certain place, such as windy on a certain day, rainy at a certain time, how cold it is in the morning, how hot it is in the afternoon and so on. , so as to infer its reasons and trends. On the other hand, phenology records the growth and decline of plants and the communication and rearing of animals.
Such as willow green, peach blossom, swallow coming and other natural phenomena, so as to understand climate change and its impact on animals and plants. Climate observation records the local weather at that time; Phenological observation records not only reflect the weather of the day, but also reflect the accumulation of weather in the past period. So phenology is sometimes called bioclimatology.
The relationship between biological periodicity (such as germination, flowering and fruiting of plants, migration of migratory birds and hibernation of some animals) and seasonal climate. It also refers to the relationship between abiotic changes in nature (such as first frost and thawing). ) and seasonal climate.
Seventy-two phenology is based on the observation of natural phenomena such as birds, animals, grasses, trees and the changes of cold and warm weather in the ancient Yellow River basin in China. It is summarized in five days to express the regularity of meteorological cycle, which is a detailed explanation and enrichment of the twenty-four solar terms.
Ancient climate
The ancient ancestors took five days as the waiting period, three times as qi, six times as time, and four times as age, with 24 solar terms and 72 waiting periods every year. The word "climate" is a generalization of solar terms and climate. As early as more than two thousand years ago, Yizhoushu was the sixth Juan? Time training solution? There is a complete record of the use of solar terms and climate in volume 52.
The phenology calculated by the ancients is 72 days a year, and every 5 days is 360 days, but there are 365 days a year. Therefore, it is stipulated that the 26th to the end of each month, the sixth day of the Gregorian calendar, and the first day of this month is six days if it meets the 3rd1of the big month.