长期以来,南京市墙体材料一直以粘土实心砖为主体,新型墙体材料发展缓慢。1989年全市墙体材料产量为34.32亿块(折标砖,以下同),其中粘土实心砖产量为33.84亿块,占全市墙体材料总产量的98.6％,而新型墙体材料的产量只有0.48亿块,仅占1.4％,低于全国平均5％和江苏省平均2.5％的水平。我市人均耕地面积只有445平方米,低于全国人均866平方米和江苏省人均680平方米的水平。前几年,我市砖瓦企业发展失控,全市拥有240座轮窑和520余座土窑,每年 For a long time, the wall material of Nanjing has been dominated by clay solid bricks, and new wall materials have developed slowly. In 1989, the city’s wall material production was 3.432 billion (a discount brick, the same below), of which the clay solid brick production was 3.384 billion, accounting for 98.6% of the city’s total wall output, while the output of new wall material was only 0.48. Billion, accounting for only 1.4%, is lower than the national average of 5% and Jiangsu’s average 2.5%. Per capita arable land in the city is only 445 square meters, which is lower than the national average of 866 square meters and Jiangsu’s per capita 680 square meters. In the past few years, the development of brick and tile enterprises in our city was out of control. The city has 240 wheel kiln and more than 520 earth kiln, each year.