China's exports rose a less-than-expected 2.3% in January and February from a year earlier while imports fell more than 8% in a slow start to a year dogged by uncertainty over U.S. tariffs and other policies.

Economists had forecast that exports would rise 5% year-on-year and that imports would edge higher. China's overall trade surplus grew to $170.52 billion in the first two months of the year.