China's monetary tightening in 2011 may occur mainly in the first half as officials tackle the fastest inflation in more than two years, JPMorgan Chase & Co and Morgan Stanley said.

The People's Bank of China increased key one-year lending and deposit rates by 25 basis points on Christmas Day in its second move since mid-October.

The change took effect on Sunday. China's stocks rose on Monday and yuan forwards climbed to the highest level in five weeks as the decision bolstered speculation that inflation will be contained.

Premier Wen Jiabao aims to limit asset bubbles in the real estate market and prevent rising prices after flooding the economy with cash from late 2008 to drive a recovery.

Officials may keep raising interest rates and banks' reserve requirements, sell bills to soak up cash, and allow more gains by the yuan against the dollar, according to JPMorgan.

"These policy moves could be front-loaded in the coming months, as headline inflation figures remain high and economic growth faces overheating risks early next year," said Wang Qian, the brokerage's Hong Kong-based chief China economist.

Industrial companies' profits rose 49.4 percent in the 11 months through November from a year earlier, a report showed on Monday. That's compared with a 7.8 percent gain in the same period in 2009.

The benchmark lending rate rose to 5.81 percent, compared with 7.47 percent before cuts from late 2008 to counter the global financial crisis.

It will climb to 6.56 percent by the end of next year, according to the median forecast in a Bloomberg News survey of economists this month.

The deposit rate increased to 2.75 percent, compared with the 5.1 percent annual pace of inflation in November. China may raise rates as many as three times in the first half of next year, according to Morgan Stanley, while JPMorgan forecast two increases in that period.

Officials have raised bank reserve ratios six times this year and trimmed loan growth from record levels. They scrapped the yuan's almost two-year peg to the dollar in June.

Since then, the currency has gained about 3 percent, with non-deliverable forwards showing that traders are betting on a further increase of 2.3 percent in the next 12 months.

Wen said "inflation expectations are more dire than inflation itself" and urged people to remain confident, Xinhua News Agency reported on Sunday. The government can keep prices at a reasonable level through measures such as boosting agricultural output, he said in a radio broadcast.

A central bank survey this quarter showed consumers are more concerned about inflation than at any time in the past decade.

Consumer prices rose 5.1 percent in November from a year earlier, the most in 28 months, mainly driven by food costs. Across 70 major cities in China, property prices climbed 7.7 percent.

China's latest rate increase may precede a year in which emerging-market central banks break away from their counterparts in the industrial world by tightening monetary policy.

Morgan Stanley economists forecast a period of "polarizing policy paths" as officials from China to Brazil become increasingly confident that they can, and should, raise rates because of robust growth and accelerating inflation.

At the same time, the Federal Reserve, the European Central Bank and the Bank of Japan will leave their benchmarks on hold throughout the year to bolster sluggish recoveries, they say.

Morgan Stanley analysts predict 17 of 23 emerging economies they monitor will lift rates in 2011 including Brazil, China and India.

The likely policy split illustrates how the economic "center of gravity" is shifting toward emerging nations, said David Cohen, an economist at Action Economics Ltd in Singapore.

HSBC Holdings Plc economist Qu Hongbin said on Saturday that he expects "more hikes in both interest rates and reserve ratios in the coming months" in China.

In contrast, Federal Reserve policymakers this month renewed a pledge for an "extended period" of low interest rates and affirmed a plan to buy $600 billion of bonds through June, as part of efforts to spur growth and reduce unemployment.

China is tightening after a record expansion of credit to counter the effects of the world financial crisis.

The broadest measure of money supply, the M2, has surged by 55 percent over the past two years and outstanding yuan-denominated loans have climbed 60 percent to 47.4 trillion yuan ($7.1 trillion).

The nation needs "a slowdown in money and credit growth in order to bring inflation fully under control," Goldman Sachs Group Inc analysts Song Yu and Helen Qiao said in a note. "The balancing act of keeping growth high and inflation low is leaning increasingly towards the latter."