Why does it snow in Mohe County in winter?

Mohe is in the northernmost part of China. According to the principle of geography, the direct point of the sun for half a year is in the southern hemisphere, so the farther north the northern hemisphere is, the smaller the solar altitude angle is, and the less solar radiation is obtained, which is the fundamental reason for the cold winter in the north.

In addition, there is no obvious alpine plateau blocking in the north, and cold air from Siberia, Russia can directly drive the north of Heilongjiang. As the northernmost city, Mohe is most affected, so it is very cold in winter.

Mohe's climate belongs to the subtropical coniferous forest climate in temperate continental climate. Influenced by Siberia, the northwest wind blows and it is dry and cold, but the climate in the North Pacific is not affected, and the climate is dry and cold.

natural resource

water resource

Mohe City has 98 famous rivers that are frozen all the year round and flow all the year round. There are more than 800 unknown rivers. Total length of riparian line14831.4km. Among them, Heilongjiang is 245 kilometers long in the county. The total annual runoff is about 6.55 billion cubic meters, the annual average runoff height is about 200 mm, and the total average outflow water is 3 billion cubic meters. The total domestic water area is 2.694 million mu, excluding the seasonal accumulated water area in Heilongjiang, and the per capita natural water area is 30 mu. The city's water quality is low-salinity bicarbonate (HCOs) water and soft water.

Most small and medium-sized rivers in China began to freeze at 65438+ 10 in late June and began to thaw in late April. The freezing period is as long as 7 months, and the ice thickness is 1-2.5 meters. Except for the larger mainstream, it is generally frozen to the end. The water temperature of Mohe section in Heilongjiang Province is about 20℃ in winter, 6℃ in summer and 14- 16℃ in summer, all of which belong to cold water type.

plant resources

Mohe mountain area is rich in wild plant resources. Due to geographical and climatic conditions, there are relatively few species of wild plants, but the orders, species and genera are relatively complete. With a large population area, it has great resource advantages and important economic and scientific research value. There are 8000 species of wild plants, belonging to 23 orders, 4 1 species and 99 genera. Mohe flora belongs to Pan-northern flora, European and sub-forest flora and Daxinganling flora.

There are not many kinds of wild plants, but their floristic composition is very complicated. There are not only plant species in cold temperate coniferous forest area and cold temperate broad-leaved mixed forest area, but also plant species in temperate grassland area. There are not many endemic species, and there is only one rare species, that is, Korean pine. In the flora, the bright coniferous forest dominated by Larix gmelinii is the main body. Betula platyphylla is a tree species with simple composition, fewer species and fewer characteristic species. There are 1000— 1 100 species of vascular plants. Among them, the only characteristic species are Eupatorium adenophorum and Eupatorium adenophorum.