China's per capita arable land resources is less than the world average of 40%, due to urban and rural housing fired clay bricks a year actually damaged 70 acres of fertile land. This is the warning issued by the 12 southern provinces and cities of new wall materials Symposium 2004 held in Nanchang.
It is understood that China's arable land accounts for only 10% of the land area multi-point distribution in low-yielding fields, hills, plateaus, accounting for 66% and 40% of arid, semi-arid farmland varying degrees of degradation. By 2003, the country's per capita arable land resources is only 1.43 acres, of which 30% of the counties, the city's per capita arable land has been less than 0.8 mu per capita of the United Nations-mandated warning line. However, for various reasons, China is still one of the world's few solid clay brick as the main wall materials.
In China, the wall materials accounted for approximately 70% of overall housing construction materials, including clay bricks hold a dominant position in the wall materials required for the production of solid clay bricks, clay resources are arable land quality clay, so the destruction of land resources is evident. According to statistics, there are brick enterprises, more than 90,000, covers an area of more than 5 million acres, the annual production of about 600 billion pieces of clay bricks, clay drain resources of 1.3 billion cubic meters, according to the average excavation depth of 3 m translation, the equivalent of about 70 million mu of annual eradication. Such as in the "Land of Abundance Chengdu Plain, there are still more than 300 clay brick and tile factory, the annual production capacity of more than 30 billion pieces, occupied of 2.6 million mu of high-quality farmland abandoned.
For the transformation of this serious waste of land resources traditional firing, the State Council approved and transmitted as early as 12 years ago, the former State Bureau of Building Materials and other departments jointly issued the views on the development and promotion of new wall materials, and the National 170 large and medium-sized cities "prohibit the use of solid clay bricks schedule.
