SHANGHAI, May 19 (Reuters) - China's two main stock exchanges in Shanghai and Shenzhen and its futures and commodities exchanges in Shanghai, Zhengzhou and Dalian will halt trade for three minutes from 2:28 p.m. (0628 GMT) on Monday to observe a national period of mourning for victims of last week's earthquake.

The three-minute halt will come exactly one week after the quake struck southwest China's Sichuan province, where the death toll now exceeds 30,000.

China has declared a three-day national period of mourning for the disaster, in which public entertainment will be suspended, flags flown at half-mast and the Olympic torch relay temporarily halted.

The Shanghai Stock Exchange, the Shenzhen Stock Exchange, the Shanghai Futures Exchange, the Zhengzhou Commodity Exchange and the Dalian Commodity Exchange will participate in the three-minute trading halt, the China Securities Regulatory Commission said in a notice on its website. (Reporting by Edmund Klamann; )

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