BEIJING, July 15 (Reuters) - China"s economy grew more slowly than expected in the second quarter, as slowing manufacturing activity, higher raw material costs and new COVID-19 outbreaks weighed on the recovery momentum. Gross domestic product (GDP) expanded 7.9% in the April-June quarter from a year earlier, official data showed on Thursday, missing expectations for a rise of 8.1% in a Reuters poll of economists. read more Growth slowed significantly from a record 18.3% expansion in the January-March period, when the year-on-year growth rate was heavily skewed by the COVID-induced slump in the first quarter of 2020. June activity data slowed from the month before but beat expectations. "The numbers were marginally below our expectation and the market"s expectation (but) I think the momentum is fairly strong," said UOB economist Woei Chen Ho in Singapore. "Our greater concern is the uneven recovery that we"ve seen so far and for China the recovery in domestic consumption is very important...retail sales this month was fairly strong and that may allay some concerns." While the world"s second-largest economy has rebounded strongly from the COVID-19 crisis, buoyed by solid export demand and policy support, data in recent months suggest some loss in momentum. Higher raw material costs, supply shortages and pollution controls are weighing on industrial activity, while small COVID-19 outbreaks have kept a lid on consumer spending. Investors are watching to see if the central bank is shifting to an easier policy stance after the People"s Bank of China announced last week it would cut the amount of cash that banks must hold as reserves. The move released about 1 trillion yuan ($154.64 billion) in long-term liquidity to bolster the recovery and came even as policymakers have sought to normalise policy after the economy"s strong rebound from the coronavirus crisis to contain financial risks. On a quarterly basis, GDP expanded 1.3% in the April-June period, the National Bureau of Statistics said, just beating expectations for a 1.2% rise in the Reuters poll. The NBS revised down growth in the first quarter from the fourth quarter last year to 0.4%. The NBS data also showed China"s industrial output grew 8.3% in June from a year ago, slowing from a 8.8% rise in May. Economists in the poll had expected a 7.8% year-on-year rise. Retail sales grew 12.1% from a year earlier in June. Analysts in the poll had expected a 11.0% increase after May"s 12.4% rise. "The domestic economic recovery is uneven," said Liu Aihua, an official at the NBS at a briefing on Thursday. "We must also see that the global epidemic continues to evolve, and there are many external instabilities and uncertain factors," she said. Data earlier this week showed China"s exports grew much faster than expected in June, but a customs official said overall trade growth may slow in the second half of 2021, partly reflecting COVID-19 pandemic uncertainties. read more Economists in the Reuters poll expected a 8.6% GDP expansion in 2021, which would be the highest annual growth in a decade and well above the country"s official target for growth higher than 6%. China was the only major economy to have avoided a contraction last year, expanding 2.3%. read more Premier Li Keqiang reiterated on Monday that China would not resort to flood-like stimulus. Still, economists in the Reuters poll expected more support this year, forecasting a further cut in the bank reserve requirement ratio (RRR) in the fourth quarter. Fixed asset investment grew 12.6% in the first six months from the same period a year earlier, versus a forecast 12.1% uptick and down from a 15.4% jump in January-May. ($1 = 6.4665 yuan)