Due to the abundant sunshine during the day, the photosynthesis intensity of local plants is greater, so plants can produce and transform more organic substances such as sugar. When the temperature is low at night, the respiration of plants is relatively weak, which makes the accumulated organic matter consume less. The result is reflected in melons and fruits, which naturally taste sweeter.
Why Xinjiang fruit is sweet? Because Xinjiang has a continental climate with strong sunshine and large temperature difference between day and night, it is convenient for nutrient accumulation.
Dry climate, less rainy days, long sunshine time and strong sunshine during the day, plants can fully carry out photosynthesis and make nutrients; At night, the temperature drops very low, which weakens the respiration of plants and reduces the consumption of nutrients. The fruit has accumulated a lot of nutrition, so it grows big and sweet.
I would like to ask why the melons and fruits in Xinjiang are so sweet because the dry climate breeds high-quality melons and fruits.
The excellent quality of melons and fruits in Xinjiang is closely related to the local dry climate. That is, there are many sunshine hours; Strong solar radiation; Rich in heat; There is a great temperature difference between day and night. Compared with Turpan in Xinjiang and Siping in Jilin at the same latitude (the altitude of the two places is similar), the average daily sunshine in Turpan is 10 hour, while that in Siping is only 8 hours; The annual average daily temperature in Turpan is higher than the accumulated temperatures of 10℃ and 539 1℃, while that in Siping is only 3050℃. The average temperature difference between day and night during the critical period of filling maturity in Turpan is 65438 05.2℃, which is 5.8℃ higher than 9.4℃ in Siping.
Adequate sunlight is the main raw material for producing organic matter, especially soluble solids (including sugar) in fruits and vegetables. Rich heat is a necessary environmental condition to ensure the growth and development of fruits and vegetables (this is the main reason why the quality of fruits and vegetables in other places with similar conditions in Xinjiang is much worse, but the latitude is slightly north or the altitude is slightly higher, so the temperature is lower); The temperature difference between day and night can make photosynthesis produce a lot of organic matter and sugar at high temperature during the day, and the consumption of respiration at night is minimized. Scientific research statistics show that, taking Lanzhou white melon as an example, the sugar content of melon and fruit increases by 1℃, or the annual accumulated temperature increases by 500℃, or the annual sunshine hours increase by about 1.2 hours (the sugar content of fresh melon and fruit is generally only 10% ~ 20% at most). This is why the sugar content of melons and fruits in Xinjiang is generally higher than that in the eastern region 1/5 or more. Statistics also show that the acid content in melons and fruits is closely related to the temperature at maturity. High temperature is beneficial to the metabolic decomposition of acids in fruits, so the acidity in fruits is low. This is the main reason why the sugar content of Xinjiang melons and fruits in eastern Xinjiang (Turpan, Hami and other areas with the lowest altitude and the highest temperature) is higher than that in southern Xinjiang, and that in southern Xinjiang is higher than that in northern Xinjiang, while the acid content of melons and fruits is just the opposite.
In addition, climatic conditions also affect the yield of fruits and vegetables. For example, the yield of Turpan grapes mainly depends on the proportion of fruiting branches to the total number of branches, and this proportion mainly depends on the accumulated temperature above 10℃. When the accumulated temperature (accumulated temperature) is less than 3000℃, the proportion is generally less than 10%. When the accumulated temperature increases 100℃, the proportion of fruiting branches increases 1% ~ 2%. The accumulated temperature in Turpan basin of Xinjiang is the most, with the proportion of fruiting branches as high as 35% ~ 40%, and the accumulated temperature in Yining area is the least, only 1 1.5%. This will make a big difference in output.
Why is fruit so sweet? Fruit is sweet because the pulp contains sugar, which is the energy source of animals. In order to obtain energy, animals naturally prefer sweet fruit with high sugar content, and the seeds of this fruit are more dispersed.
In evolution, those fruits with delicious flesh have more opportunities to be spread, which cannot be completely said to be selective evolution of plants. A bigger part is the screening of animals for many years. Bad food is gradually extinct, and good food is better spread.
Sweetness is only the taste perception of human beings and some other animals. It is not plants that have evolved sweetness, but humans that have evolved sweetness. Moreover, for the sake of sweetness, human beings have artificially selected and cultivated various fruits. There are all kinds of sweet and sour fruits in nature, but most fruits with other flavors are not eaten for various reasons.
The benefits of eating fruit:
Fiber is good for skin care, and the fiber of fruit is pectin, which is good for defecation; Fiber composition can also promote the metabolic function of the body. Because fruit can increase the excretion and metabolism of human body, which is beneficial to lose weight.
Vitamins make people beautiful The main nutrients supplied by fruits are vitamins, among which vitamin C and vitamin A are the most important. Vitamin C in fruits is not lost as much as when cooking vegetables, so it is a natural supplement of vitamin C. Vitamin C can delay aging and is an indispensable nutrient for beauty.
Eating more fruits is good for your health. Fruit contains natural pigments, which can effectively prevent cancer. Some fruits containing beta carotene will be converted into vitamin A if eaten in human body, which can prevent cells from being damaged by free radicals. In addition, biological lutein, an anticancer substance in citrus fruits, can help fat-soluble carcinogens to be converted into water, which is beneficial to excretion.
Why are the melons and fruits in Xinjiang so sweet? Xinjiang is located in the northwest region, with continental climate, strong sunshine, less precipitation and small cloud cover, so there is plenty of sunshine, large temperature difference between day and night, less consumption of nutrients and more accumulation of sugar, so melons and fruits are very sweet.
Why are the melons and fruits in Xinjiang so sweet? Xinjiang has long summer days, dry climate, less clouds, long sunshine time and strong photosynthesis, which is beneficial to the growth of fruits and vegetables. The large temperature difference between day and night in Xinjiang is very beneficial to the transformation and accumulation of sugar.
Large temperature difference, strong illumination, strong photosynthesis and weak respiration.
Students who have eaten cantaloupe know that it is a specialty of Xinjiang. Hami melon, green skin, yellow gourd ladle, tender meat, sweet juice, very delicious. Xinjiang also produces white raisins, which are much sweeter than those in the mainland! So, why are the melons and fruits in Xinjiang particularly sweet?
The reason why melons and fruits in Xinjiang are sweet is determined by the special geographical environment. From the map of China, we can see that Xinjiang is located in the northwest of China. It lives inland, far from the sea, surrounded by mountains and plateaus, and humid air is difficult to reach. Therefore, the climate here is characterized by dryness, little rain, strong sunshine and drastic temperature changes. This climate provides unique conditions for the growth of melons and fruits.
Because of the dry and little rain, there are more sunny days and abundant heat here. The high temperature during the day strengthens the photosynthesis of plants and is beneficial to the synthesis of carbohydrates; The low temperature at night weakens the respiration of plants.
It can reduce the loss of nutrients and is beneficial to the storage of sugar in plants, so melons and fruits grow well here and have the characteristics of high sugar.
Speaking of which, some students may ask again, isn't there less rain in Xinjiang? How can melons and fruits grow well without water? Yes, in order to overcome this disadvantage, since liberation, the broad masses of Xinjiang people have opened canals to divert water on the saline-alkali beach. They introduced hundreds of fruit tree varieties and established dozens of large orchards by using the melting water of alpine ice and snow, underground karez wells and artesian wells. Now Xinjiang is famous all over the country except cantaloupes and raisins, watermelons, pears and apples, and some of them are exported abroad!
Why are the melons and fruits in southern Xinjiang so sweet? It is caused by geographical environment and climate factors! Xinjiang has a long sunshine time and plenty of sunshine.
Why are the melons and fruits in Xinjiang so sweet? Long sunshine time and large temperature difference between day and night are beneficial to the conversion of starch into soluble sugar, such as sucrose. During the day, the temperature is high, evaporation and transpiration are strong, and the water content of pulp is small, which further improves the conversion rate of starch, and the sweetness is of course high.