BEIJING--A closely watched early indicator of Chinese manufacturing activity rose in September, data showed Tuesday, a welcome sign given the struggles of the world's second-largest economy.

Improved sentiment on the factory floor comes as economists and investors look to China to give the global economy a push. In August, China's industrial production, energy consumption and fixed-asset investment all weakened, while the housing market is slumping. These have been tempered somewhat by strong growth in exports and steady performance in retail and services.

"Economic activity in the manufacturing sector showed signs of stabilization in September," HSBC economist Qu Hongbin said.

"Overall, the data still point to modest expansion. The property downturn remains the biggest downside risk to growth," Mr. Qu added.

The preliminary HSBC China Manufacturing Purchasing Managers Index rose to 50.5 in September, compared with a final reading of 50.2 in August, HSBC Holdings PLC and data provider Markit said Tuesday.

The HSBC/Markit gauge tends to reflect sentiment among smaller, private companies. China's official PMI reading, which is due on Oct. 1, focuses more on large, state-owned companies. A reading above 50 indicates expansion from the previous month, while a reading below 50 indicates contraction.

HSBC said the subindexes covering both new orders and new export orders increased at a faster pace, while the employment subindex continued to decline.

Tuesday's results follow comments by Finance Minister Lou Jiwei at the Group of 20 meeting last weekend repeating Beijing's message that the government wouldn't resort to broad-based stimulus measures. Mr. Lou added that Beijing was focused on several economic indicators and that a shortfall in one area wouldn't necessarily force a policy response.

The China Beige Book survey of bankers and 2,000 companies, a broader look at the economy also released Tuesday, suggests that Asia's largest economy continued to struggle in the third quarter, with year-over-year deterioration in a range of sectors from apparel and autos to furniture and luxuries.

Factory owners faced headwinds, although not as pronounced as in the third quarter of 2013, the survey found, as new domestic orders decelerated. But a recovery in services in the third quarter prevented the economy from decelerating further. While much has been made of China's stimulus efforts, there is little evidence that a great deal of this is coursing through the economy, the beige book survey found, amid more weakness in capital investment.

Liyan Qi and Mark Magnier

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