Who can tell me what the natural environment in Northeast China is like?

The scope of Northeast China is equivalent to the cold temperate zone and temperate humid and semi-humid areas in China, with cold and humid forests and meadows as the main landscapes. The border of northeast China is bounded by national borders in the north and east; The western boundary starts from the root estuary on the west side of Daxing 'anling, extends southward to the vicinity of Aershan along the edge of hilly platform at the west foot of Daxing 'anling, then crosses Daxing 'anling to Ulanhot eastward along the Taoer River Valley, southward along the east foot of Daxing 'anling, passes through Tuquan to Baiyin Hu Shuo, passes through Yu Zhan and Baokang along the south edge of Songliao Basin, and then passes through Xinkai River and Xiliao River to the confluence of East and West Liaohe Rivers. This boundary is equivalent to the isoline with dryness of 1.25 and the western boundary of chernozem distribution on the flat ground. The Hulunbeier Plateau, the southern section of Daxing 'anling and the Xiliaohe Plain to the west of the boundary belong to temperate semi-arid grassland landscape and Inner Mongolia. The southern border of Northeast China, that is, the border with North China, generally goes south from Zhangwu via Kangping and Changtu, and then reaches the Yalu River via Tieling, Fushun and Kuandian. Equivalent to isoline of active accumulated temperature ≥ 10℃ and 3200℃. The lower reaches plain of Liaohe River and Liaodong Peninsula south of the boundary belong to warm temperate summer green forest landscape, which is included in North China.

According to the above boundaries, the northeast region starts from Kuandian County, Liaoning Province in the south and ends at the center line of Heilongjiang main channel in the north, with a length of about 1300 km. It is about 1000 km wide from Aershan on the western slope of Daxing 'anling in the west to the confluence of Wusuli River and Heilongjiang in the east. Including Daxinganling, Xiaoxing 'anling, Changbai Mountain, Songnen Plain and other natural units. It has different scope and meaning from the northeast (Liaoning, Kyrgyzstan and Heilongjiang provinces) which is customarily called.

The natural landscape in Northeast China is cold and humid, and its formation and development are closely related to geographical location. Northeast China is the highest latitude area in China. Cold in winter and high latitude are the basic factors, but their relative positions also play an obvious role. It is adjacent to the "cold pole" in the northern hemisphere-East Siberia, where Vilho Yansk-Oymyakon is located. Cold waves from the Arctic Ocean often invade, causing the temperature to plummet. To the west is the Mongolian Plateau, which is as high as 1000 meters above sea level. The Siberian polar continental air mass often attacks the northeast and has a strategic position. Therefore, the winter temperature in this area is 10℃ lower than that in the mainland at the same latitude. The northeast is not far from the Sea of Okhotsk, and it is known as the Pacific Ice House. The northeast monsoon, which originates from here, often enters the northeast along the lower reaches of Heilongjiang River in spring and summer, which makes the temperature in the northeast not high in summer, and even there is no summer in the north and higher mountainous areas. This area is the easternmost part of China, and it obviously protrudes to the ocean. It borders Bohai Sea and Yellow Sea in the south and Japan Sea in the east. The south monsoon, which originates from Ogasawara Islands (high pressure) and extends to the northwest, can fly directly to the northeast. As for the deep-changed tropical marine air masses from Central China and North China, they can also enter the Northeast through the Bohai Sea and the Yellow Sea, bringing more rainfall and a longer rainy season to the Northeast. Due to the low temperature and weak evaporation, although the precipitation is not very rich, the humidity is still high. Make the northeast region have cold and humid climate characteristics. There are a large area of coniferous forest, mixed coniferous and broad-leaved forest, meadow grassland, fertile black soil, widely distributed frozen soil and swamp in Northeast China, which are all related to the humid and semi-humid continental monsoon climate in temperate zone.