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China's trade surplus with US soars in Q1 but March exports falter

* China posts strong Q1 trade data even as tensions with US rise

* Q1 data suggests demand still solid at home and abroad for now

* Exporters may be rushing out shipments to beat tariffs-analyst

* March more mixed: exports in surprise drop but may be seasonal China posts rare trade deficit, first since Feb 2017

* Q1 trade surplus with US up nearly 20 pct but narrows in March (Adds detail on trade with U.S., additional analyst comment)

By Elias Glenn and Stella Qiu

BEIJING, April 13 (Reuters) - China's trade surplus with the United States surged nearly 20 percent in the first quarter, with some analysts speculating exporters were rushing out shipments to get ahead of threatened tariffs that are spurring fears of a full-blown trade war.

The latest readings on the health of China's trade sector are unlikely to ease tensions following weeks of tit-for-tat tariff threats by Washington and Beijing, though they suggest China's economy is still in relatively solid shape.

Even as China's trade surplus narrowed overall in the first three months of the year, its surplus with the U.S. surged 19.4 percent to $58.25 billion from a year earlier, customs data showed on Friday.

While China was busy selling more to the U.S., it was buying more from other countries, and ran a $9.86 billion deficit with the rest of the world in the quarter.

China's overall exports and imports both grew at a strong double-digit clip early in the year, and while exports unexpectedly fell in March -- resulting in a rare trade deficit -- most analysts chalked it up to seasonal factors and said it was too early to call a trend.

Still, while no hard timeline has been set by either Washington or Beijing for the actual imposition of tariffs, analysts said China's exporters may already be adapting their strategies as punitive trade measures loom.

China's first-quarter exports to the U.S. rose 14.8 percent from a year earlier, despite a 5.6 percent drop in March. Its imports from the U.S. rose 8.9 percent in the quarter and 3.2 percent in March.

That helped narrow its surplus with the U.S. in March alone to $15.43 billion from $20.96 billion in February, but that was still nearly 18 percent higher than March 2017.

"The sharp decline in March export growth after very solid performance in January and February suggests some exporters may have front-loaded exports (early) this year due to concern over the possibility of a Sino-U.S. trade war after the U.S. hiked tariffs on global imports on solar panels and washing machines," said Lisheng Wang, an economist at Nomura in Hong Kong.