Poyang Lake

Poyang Lake is a very large lake in China.

Three rivers flow into it. The lake flows into the Yangtze River. Many birds live here. Half a million birds visit the lake. Some white birds stay all winter.

A small animal called a river pig lives there too. The water can get very low. This happens when there is no rain. It also happens because of a big dam. We must protect the animals in the lake.

Poyang Lake is the largest freshwater lake in China.

Three rivers flow into the lake. These are the Gan, Xin, and Xiu rivers. The lake flows into the Yangtze River.

The lake is a home for many animals. About 500,000 birds visit the lake. Many Siberian cranes spend the winter there. These birds are critically endangered, which means they are at risk of dying out. A small animal called a finless porpoise lives there too. People call it the "river pig."

There are some problems for the animals. Large ships move through the lake often. This makes it hard for the porpoises to hear food. Also, digging for sand makes the water muddy. This makes it hard for them to see.

The lake size changes with the seasons. Sometimes the lake gets much smaller. In 2012, the lake almost dried up. This happened because of a drought. It also happened because of the Three Gorges Dam. This dam stores water for use in winter. Scientists want to protect the lake and its wildlife.

Poyang Lake is the largest freshwater lake in China.

It sits within the Jiujiang Prefecture in Jiangxi Province. Three rivers feed the lake: the Gan, Xin, and Xiu rivers. These waters flow into the lake before moving north. They enter the Yangtze River through a single channel. The lake size changes a lot during different seasons. It can grow very large or shrink quite a bit. In recent years, the total size has been decreasing.

Many animals rely on this water to survive. About 500,000 migratory birds use the lake as a home. Many Siberian cranes fly here to spend the winter. In fact, up to 90% of these rare birds stay here. The lake also holds the finless porpoise. People call this animal the "river pig." There are about 500 of these porpoises in Poyang and Dongting Lakes. However, their numbers are dropping by 7.3 percent every year.

History shows how the lake was formed. Long ago, the Yangtze River followed a different path. Around AD 400, the river changed its course to the south. This change caused the Gan River to back up. This backup helped form Lake Poyang. The lake was once named Pengli Lake. It was also named for Poyang County. The lake once flooded Haihun County as well. This event led to a large group of people moving to Wucheng.

Some events in the lake are very famous. In 1363, the Battle of Lake Poyang took place. Some say it was the largest naval battle ever. During the Tang dynasty, the lake was very large. Its area reached 20,000 square kilometers back then. In early 2012, the lake faced a hard time. Drought and sand digging made it very small. The area dropped to only 2,665 square kilometers that year.

Today, people work to keep the lake healthy. Large ships move through the lake very often. Two ships enter or leave every single minute. This noise makes it hard for porpoises to hear food. Also, digging for sand makes the water very muddy. This makes it hard for them to see. In 2020, China started a 10-year fishing ban. This ban protects 332 sites to help wildlife. Groups like Conservation International are also working to protect the area.

Poyang Lake is the largest freshwater lake in China.

It is located within the Jiujiang Prefecture of Jiangxi Province. Three specific rivers feed the lake: the Gan, Xin, and Xiu rivers. These rivers flow into the lake before moving north. The water then flows into the Yangtze River through a single channel. The surface area of the lake fluctuates dramatically between wet and dry seasons. In recent years, the overall size of the lake has been decreasing.

The lake's formation is tied to the changing path of the Yangtze River. Before the Han dynasty, the Yangtze followed a more northerly course. It flowed through what is now known as Longgan Lake. At that time, the Pengli Marsh formed the lower reaches of the Gan River. The area of the current Poyang Lake was simply a plain along the Gan River. Around AD 400, the Yangtze River switched to a more southerly course. This change caused the Gan River to back up further. This process eventually formed Lake Poyang.

History provides several names and stories for this water system. It was called Pengli Lake in the past, though it is not the same as the modern lake. The lake was named after Poyang County. This county, along with Haihun County, was flooded by the lake. This flooding forced a mass migration to Wucheng Township. Wucheng is located in what is now Yongxiu County. This event created the Chinese idiom, "Drowning Haihun County gives rise to Wucheng Township." The name Poyang also relates to the earlier Po County from the Qin dynasty. That county was named for the city of Poyi in the state of Chu.

The lake has reached massive sizes throughout history. During the Tang dynasty, the lake reached its greatest size. Its area was approximately 20,000 square kilometers during that period. However, modern environmental factors have caused the lake to shrink. In early 2012, the lake area dropped to about 2,665 square kilometers. This was caused by drought, sand quarrying, and water storage at the Three Gorges Dam. In October of that year, only 1,500 square kilometers of land were underwater. This is much smaller than the normal area when the lake is full.

Many animals depend on this ecosystem for survival. The lake provides a habitat for half a million migratory birds. It is a major destination for birdwatching. During the winter, many Siberian cranes migrate to the lake. Up to 90% of this critically endangered species spend their winters there. The lake is also home to the finless porpoise. Locals call this animal the "jiangzhu," or river pig. There are about 500 of these porpoises in Poyang and Dongting Lakes. However, their population is dropping by 7.3 percent every year. In 2007, their numbers were less than half of what they were in 1997.

Several human activities impact the wildlife in the lake. Sand dredging is a major source of revenue for the local economy. However, high-density dredging is a principal cause of wildlife death. Dredging makes the water much muddier. This makes it hard for porpoises to see. They must rely on sonar, which is a system of sound waves, to find food. Additionally, two large ships enter or leave the lake every minute. This high density of shipping makes it hard for porpoises to hear their food. It also prevents them from swimming freely between banks.

Conservation efforts are currently underway to protect the region. In January 2020, China imposed a 10-year fishing moratorium. This ban covers 332 sites along the Yangtze, including Poyang Lake. This measure aims to protect marine biodiversity. In 2019, Conservation International China began working in the Poyang Lake basin. They use the Freshwater Health Index to identify challenges. This helps them prioritize actions for wetland protection and sustainable resource use. The local government has also proposed a Poyang Lake Dam. This would involve a sluice wall to maintain water levels. However, scientists argue this could hurt wildlife diversity.