SINGAPORE (REUTERS) - Britain's vote to leave the European Union has ramped up the urgency for some Asian central banks to ease monetary policy, as a prolonged period of uncertainty threatens a wider downshift in trade and investment.

Economists warn delayed investment decisions and a hit to jobs and consumption from Brexit will hurt exports from Asia's trade-reliant economies, which are already reeling from weak external demand, particularly from China.

A round of Asian central bank policy meetings in the region this month could reveal an increased bias to ease policy, if not deliver outright interest rate cuts.

"The uncertainty of the EU and UK relationship is likely to put a dampener on Asia's exports to that region, perhaps extending Asia's trade recession," said Mr Khoon Goh, head of research in Asia at ANZ in Singapore.

HSBC sees increased prospects of easing in Australia, New Zealand, South Korea, Japan, China and Thailand although the risks of inflation from currency weakness could constrain policy options in emerging markets like India, Indonesia and Malaysia.

"Not everyone has the same room for manoeuvre," said Hong Kong-based Frederic Neumann, co-head of Asian economics research at HSBC.

The Reserve Bank of Australia is widely expected to skip a chance to ease again when it meets on Tuesday, as it awaits second quarter consumer price data due on July 27, but markets are betting on a cut in August given low inflation and the Brexit uncertainty.

Central banks in South Korea and Malaysia meet next week and while economists don't expect them to ease either, their policy rhetoric could reveal a more dovish bias.

Korea last week unveiled an US$8.5 billion (S$11.44 billion) economic support package to weather the Brexit shock, giving the central bank some room to hold off immediate policy stimulus.

And despite policy constraints, pricing for a Bank Negara Malaysia rate cut has increased in recent days with five- and 10-year government bond yields falling to their lowest since 2013.

Looming against scheduled policy meetings this month are expectations China's central bank will offer more stimulus in the near-term to jump-start the world's second-largest economy.

The Brexit vote has also delayed expectations of US Federal Reserve interest rate increases this year.

That may pressure smaller and vulnerable economies like Singapore, whose economy is dwarfed by trade flows, as a higher local currency would weigh on its already struggling exports.

Nowhere is the currency effect more acute than in Japan where the central bank in January introduced a negative interest rate policy in a desperate effort to revive the world's third-largest economy.

The yen's spike last month, led by Brexit-driven safe-haven flows, has increased expectations the Bank of Japan's will further expand monetary stimulus at the July 28-29 meeting.

"Luckily, the BoJ is not likely to sit idly by: expect officials to try to lean against an overly rapid climb of the yen. Direct FX intervention is certainly one possibility, but additional monetary easing will need to be part of the mix," HSBC's Neumann said.