WASHINGTON, May 15 (Xinhua) -- China's holdings of U.S. Treasuries decreased to 1.121 trillion U.S. dollars in March after a three-month rising streak, according to the data released Monday by the U.S. Department of the Treasury.

Still the largest foreign holder of U.S. Treasuries, China held 1.131 trillion dollars of U.S. Treasuries in February, a slight increase from a month earlier.

Japan's holdings of U.S. Treasuries increased to 1.078 trillion dollars in March, up from the 1.072 trillion dollars in February.

Combined, China and Japan hold more than one third of the total foreign holdings of U.S. Treasuries.

Aggregating net foreign acquisitions of long-term securities, short-term U.S. securities and banking flows, the result was a 8.1-billion-dollar net foreign outflow of U.S. securities in March, the data showed.