Geographical location of the Sanjiang Plain Which province is the Sanjiang Plain located in

The Sanjiang Plain is a low-lying flat plain formed at the confluence of the Heilongjiang, Songhua and Ussuri rivers due to long-term tectonic subsidence and sediment accumulation of the Sanjiang River. The Wanda Mountains in the middle divide the plain into two parts: the northern part is the swampy low plain, with an area of more than 40,000 square kilometers, that is, the Sanjiang Plain or Hejiang Plain in the narrow sense; In the south, there is an alluvial lake swampy plain formed by the Ussuri River and its tributaries and Xingkai Lake, with an area of 8,800 square kilometers, also known as the Muling-Xingkai Plain.

The Hejiang Plain is surrounded by mountains on three sides, the west is the Qinghei Mountain, the branch vein of the Xiaoxing'an Mountains, the south is the watershed of the branch of the Wanda Mountain, and the east is the main vein of the Wanda Mountain, Nadan Hada Ridge.

The vast and low landform of the Sanjiang Plain, the cold and humid climate of summer and autumn precipitation, the slow runoff, the rivers with sudden flood peaks, and the clayey heavy soil with seasonal freeze-thaw have promoted the long-term overhumidity and excessive water accumulation on the surface, forming a large area of swampy water body and swampy vegetation and soil, constituting a unique swamp landscape. With an area of about 2.4 million hectares, it is the largest swamp distribution area in China. Wet and swamp plants mainly include microphylla, marsh willow, moss and reed.

Among them, mossy swamps are the most widely distributed, accounting for about 85% of the total area of swamps, followed by reed swamps. The main soil types are black soil, white clay soil, meadow soil, swamp soil, etc., and meadow soil and swamp soil are the most widely distributed. The Sanjiang Plain is known as the "Great Northern Wilderness", and before large-scale reclamation in the 50s, meadows and swamps were boundless, and there were also patches of forests and wild animals.

After reclamation, many large-scale state-owned farms were built, and the "Great Northern Wilderness" has become the "Great Northern Warehouse" and has become an important commercial grain base of the country. At the same time, the ecological balance of the region has been damaged to a certain extent, the climatic conditions have deteriorated, the early flood disasters have increased, the wind damage has increased, the soil erosion has been serious, and the rare animals and plants have decreased. In the future, it is necessary to make rational use of natural resources, promote the all-round development of agriculture, forestry, animal husbandry, sideline products, and fisheries, give priority to preventing flooding, treat both floods and droughts, do a good job in the construction of farmland and water conservancy, and establish nature reserves for marshy landscapes and rare birds and precious fish.

The Sanjiang Plain is in the east of Heilongjiang Province, bordering the Xiaoxing'an Mountains in the west, the Heilongjiang River in the north, the Ussuri River in the east, and the Wanda Mountain in the south, with an area of about 10,000 square kilometers. Sanjiang. The Sanjiang Plain is an alluvial plain formed by the continuous migration and flooding of the Songhua River, Heilongjiang River and Ussuri River.

Floodplains and first-order river terraces constitute alluvial plains.

The Sanjiang Plain is located in Heilongjiang Province.

The Sanjiang Plain, that is, the northeast part of the Northeast Plain, "Sanjiang" refers to the Heilongjiang, Ussuri and Songhua rivers, where these three great rivers flow mightily and mightily, alluvial formation of this flat fertile soil.

The Sanjiang Plain is rich in water resources, with a total amount of 100 million cubic meters, its southwest is the largest swamp distribution area in China, the per capita cultivated land area is roughly equivalent to 5 times the national average, and there are 2.52 million hectares of coniferous and broad-leaved mixed forests in the low mountains and hilly areas, which are known as the "Great Northern Wilderness" in the past and the "Great Northern Warehouse" today.

Climate

The Sanjiang Plain is a temperate humid and semi-humid continental monsoon climate, with 2400 2500 hours of sunshine throughout the year, an average temperature of 21 18 in January, an average temperature of 21 22 in July, a frost-free period of 120 140 days, and an active accumulated temperature of 2 300 2 500 above 10. The freezing period is up to 7-8 months, and the maximum freezing depth is meters.

The annual precipitation is 500 650 mm, 75 85% is concentrated in June 10. Although the latitude is high, the average annual temperature is 1 4, but the summer is warm, the average temperature of the hottest month is above 22, and the rain and heat are in the same season, which is suitable for the growth of agriculture (especially high-quality rice and high-oil soybeans).

The above content reference: Encyclopedia - Sanjiang Plain.

The Three Rivers refer to the Heilongjiang, Ussuri and Songhua Rivers, which converge in the Sanjiang Plain and alluvial form this fertile land.

The Sanjiang Plain is located in the northeast region of China, where the land is fertile and the water resources are abundant, and it is known as an important granary of our country. Let's find out.

01 Heilongjiang is one of the major rivers in Asia that flows through Mongolia, China and Russia, and is located in northeast Asia. In ancient China, it was called Yushui, Heishui, Yushui, Wangjian River, Shilihan River, etc., and it was called Haramu River in Mongolian and Amur River in Russian. Heilongjiang has two sources in the north and south, with the Erguna River as the source in the south, with a total length of 4,440 kilometers, which flows into the Okhotsk Strait in Nikolaevsk, Russia.

The total length of the Heilongjiang River is 4,440 kilometers from the source of the Hailar River, about 5,498 kilometers from the source of the Krulun River, 3,000 kilometers long from the Sino-Russian border river, more than 1,400 kilometers long in Russia, and the basin area is 10,000 square kilometers.

02 The Ussuri River is a tributary of China's Heilongjiang River and the boundary river between China and Russia. The upper reaches are formed by the confluence of the Ula and Doubi rivers. Both rivers originate on the southwestern slopes of the Sikhote Mountains and flow northeast to Khabarovsk (Boli) to join the Heilongjiang River.

It is 909 kilometers (565 miles) long and has a basin area of 187,000 square kilometers (72,200 square miles). The river is wide and the current is slow. The main tributaries are the Songatsa River, the Muliang River, the Luoli River, etc.

03 The Songhua River was called the Nanhe River in the Sui Dynasty, the Nashui River in the Tang Dynasty, the Duck River and the Mingtong River in the Liaojin Dynasty, and the Mingtong River and the Songhua River in the Qing Dynasty. The Songhua River flows through Jilin and Heilongjiang provinces; The basin covers an area of 10,000 square kilometers, covering Heilongjiang, Jilin, Liaoning and Inner Mongolia, four provinces and regions in Northeast China; The annual runoff is 76.2 billion cubic meters.

04 The Sanjiang Plain is rich in water resources, with a total amount of 100 million cubic meters, and its southwest is the largest swamp distribution area in China, with a per capita cultivated land area roughly equivalent to five times the national average, and 2.52 million hectares of coniferous and broad-leaved mixed forests in the low mountains and hilly areas.

05 The vast and low landform of the Sanjiang Plain, the cold and humid climate of summer and autumn precipitation, the slow runoff, the rivers with sudden flood peaks, and the clayey heavy soil with seasonal freeze-thaw have promoted the long-term overhumidity and excessive water accumulation on the surface, forming a large area of swamp water bodies and swampy vegetation and soil, constituting a unique swamp landscape.

1. The Sanjiang Plain refers to the Heilongjiang, Ussuri and Songhua rivers.

2. The Sanjiang Plain is divided into two parts: the north of the mountain is a swampy low plain formed by the confluence of the Songhua River, the Heilongjiang River and the Ussuri River, covering an area of 10,000 square kilometers, that is, the Sanjiang Plain in the narrow sense; Shannan is an alluvial-lacustrine swampy low plain formed by the Ussuri River and its tributaries and Xingkai Lake, covering an area of 8,800 square kilometers, also known as the Muling-Xingkai Plain.

3. The Sanjiang Plain is located in the east of Heilongjiang Province, in the southwest of the Sanjiang Basin, starting from Heilongjiang in the north, Xingkai Lake in the south, Xiaoxinganling in the west, and Ussuri River in the east.

Located in the northeast of Heilongjiang Province, the Sanjiang Plain is formed by the alluvial waters of the Heilongjiang, Songhua and Ussuri rivers.

The Sanjiang Plain is located in the northeast of the Northeast Plain, and it is the largest distribution area of the Beitong swamp in China. The plain area is rich in water resources, with a total amount of 100 million cubic meters, the per capita cultivated land area is roughly five times the national average, and there are 2.52 million hectares of mixed coniferous and broad-leaved forests in the low mountains and hilly areas.