I am bangladeshi ,can I go without visa for a transit of 13 hours in Guangzhou?

I will go Bangladesh Novembor, 17, 2012 ( Japan to Gaugzhou to Bangladesh). I will arrive Gaugxhou at 19.30. i will leave next day 08.30 to Bangladesh. SO, I have to stay Gunghou Airport around 13 hours. I will at Airport only.

Can I go with out any visa.

Note that, I am a postdoctoral Student in Japan. I have one year Japaneses Viasa also. I will use China Southern Air lines.