FRANKFURT (Reuters) - Volkswagen (>> Volkswagen AG) is slashing car production at its plant in Kaluga, Russia, in face of a weakening rouble and declining real wages, a German industry magazine reported on Sunday.

Volkswagen is set to lower production at Kaluga to 120,000 vehicles this year, compared with the 150,000 originally planned, Automobilwoche reported, without citing sources.

The Kaluga plant manufactures the Volkswagen Polo and Tiguan models as well as the Skoda Fabia and Octavia.

A Volkswagen spokesman declined to comment on figures the magazine's report but said the company was temporarily reducing production volumes at Kaluga due to the economic situation in Russia, with a 10-day shutdown due to start on Sept. 8.

"Nevertheless Volkswagen Group is fully committed to the Russian market and is consecutively fulfilling its investment programme in Russia," the spokesman added, pointing out that a new body shop opened at Kaluga this year and that engine production in Kaluga and a new depot in near Moscow will start operating in 2015.

Automobilwoche also cited Opel's (>> General Motors Company) board member responsible for sales, Peter Christian Kuespert, as expressing worries about Russia, one of Opel's biggest markets in Europe, compounded by Moscow's intervention in Ukraine.

"There is no doubt that the situation in Russia is a concern. The market has shrunk substantially over the past few months and the Ukraine crisis has added to the uncertainty," Kuespert told the magazine.

Auto parts suppliers are also seeing declining orders and are putting off investment plans in Russia, the magazine added.

Foreign carmakers have invested at least $5 billion (3.06 billion pounds) in setting up local production in Russia since the mid-2000s. The government encouraged the trend by raising import duties on cars and lowering tariffs on parts.

Besides Volkswagen, U.S. automaker Ford Motor Co (>> Ford Motor Company), France's Renault SA (>> RENAULT), Japan's Toyota Motor Corp (>> Toyota Motor Corp) and South Korea's Hyundai Motor Co (>> Hyundai Motor Co) are among those which produce locally.

Russia's top car maker Avtovaz (>> AVTOVAZ OAO) said in August it planned to cut production of its Lada cars in the coming months due to the falling Russian market.

(Reporting by Jonathan Gould; Editing by Rosalind Russell)