While China has traditionally been an isolated nation, in the past half century that has changed drastically. Originally, this opened many markets for Chinese goods and fostered rapid growth of the Chinese economy. However, this has also increase the level of outside influence in China. This new outside influence has ramped up an economic down turn in China. International investors has begun loosing confidence in China, decreasing the amount of foreign investment. These investors are using other slowing emerging economies, such as Argentina and Turkey, as reasons for pulling investment. Internally, investors are concerned with a decline in foreign exports as well as increased rates of inflation. They believe this forecasts a weakening China.
The action of foreign investors as well as internal factors have forced the Chinese government to react in a number of ways. Primarily, the central bank has been removing liquidity in the economy in a hopes of discouraging investment and encourage consumption. The government hopes this would increase GDP and restore confidence in China. Economists worry that if these measures are not successful there could be a wide spread economic crisis within China.
Further Reading: http://blogs.wsj.com/economics/2014/02/09/early-look-a-shaky-economic-start/