China's land watchdog is guaranteeing there will be enough building sites available for the construction of the 10 million affordable homes the country has called for this year and said it will complete a detailed land-use plan before the end of March.

Xu Shaoshi, minister of land and resources, told China Daily on Saturday the land is "absolutely guaranteed".

If the land provided falls short of what is required, those to blame will face severe punishments, Xu said.

He added that the general land supply plan will include an additional plan specifically about the provision of land for affordable housing.

China plans to build 36 million affordable homes during the coming five years, including 10 million in 2011 and 10 million in 2012. The remaining 16 million will be finished during the final three years of the 12th Five-Year Plan (2011-2015) period, said Xu Xianping, deputy head of the National Development and Reform Commission, at a news conference in Beijing on Sunday.

The affordable homes are part of the plan to help solve the problem of rapidly rising house prices caused by an overheated real estate sector.

Compared to the target of 5.8 million new affordable homes in 2010, the challenge of finding enough land for the 10 million affordable homes in 2011 will put pressure on land resources.

The central government reiterated on Jan 26 that, of the total supply of land for housing, more than 70 percent should be for affordable housing, small- and medium-sized homes and the reconstruction of shantytowns. A report from the ministry showed the ratio in 2010 was 67.9 percent across 30 provinces, municipalities and autonomous regions.

Illegal land use, such as leaving land idle that was earmarked for building, is something the ministry is trying to counter.

Xu said more severe punishments will be introduced for such practices.