Causality between precipitation, humid climate and large forest area in southern China

Influenced by latitude and land and sea location, the prevailing wind direction in most parts of China changes significantly with the seasons within one year, forming a typical monsoon climate. The cold wind and dry cooling in winter is one of the main reasons for the large temperature difference between north and south in winter in China. The summer monsoon is warm and humid, forming the rainy season in China. In addition to the Qinghai-Tibet Plateau, China is customarily divided into monsoon region and non-monsoon region with Daxinganling-Yinshan-Helan Mountain as the boundary. The climate types in China mainly include tropical monsoon climate, subtropical monsoon climate, temperate monsoon climate, temperate continental climate and plateau mountain climate.

Characteristics of temperature distribution in China;

In winter, the temperature difference between north and south of China is very large. The 1℃ isotherm is roughly distributed along the Qinling-Huaihe line. The coldest place in winter is Mohe Town, Heilongjiang Province. In summer, the temperature is generally high in most places except the Qinghai-Tibet Plateau. The hottest place in summer is Turpan, Xinjiang. China is divided into cold temperate zone, middle temperate zone, warm temperate zone, subtropical zone and tropical zone from north to south. There is also a plateau climate zone. The main index of dividing temperature zone is active accumulated temperature.

Characteristics of temperature distribution in China:

Characteristics of temperature distribution in China and division of temperature zones in China: In winter, there is a great temperature difference between the north and the south of China. 1℃ isotherm is distributed along the Qinling-Huaihe River line. The coldest place in winter is Mohe Town, Heilongjiang Province. In summer, the temperature is generally high in most places except the Qinghai-Tibet Plateau. The hottest place in summer is Turpan, Xinjiang. China is divided into cold temperate zone, middle temperate zone, warm temperate zone, subtropical zone and tropical zone from north to south. There is also a plateau climate zone. The main index of dividing temperature zone is active accumulated temperature.

Classification and distribution characteristics of dry and wet areas in China;

The dry and wet conditions in dry and wet areas are mainly distributed in regional climate and vegetation.

Wet area > 800 mm

Precipitation is greater than evaporation in most parts of the southeast, and there is humid climate and forest in the northeast.

Semi-humid area 400-800 mm

Precipitation > Evaporation Northeast Plain, North China Plain, South Loess Plateau and Southeast Qinghai-Tibet Plateau have humid climate with grasslands and forests.

Semi-arid area 200-400 mm

precipitation