从1999年开始,由于受耕地面积的减少、农民生产积极性下降等因素影响,我国粮食生产出现全面下滑趋势,总产量由5.1亿吨下降到去年的4.3亿吨,降幅达15.3%,粮食安全形势非常严峻。中国农业大学教授王树安认为,进入21世纪后,粮食的增产途径再也不能走扩大面积、广种薄收和破坏环境 Since 1999, due to the reduction of arable land and the decline of peasants’ production enthusiasm, China’s grain production has experienced an overall downward trend. The total output has dropped from 510 million tons to 430 million tons last year, a drop of 15.3%. The food security situation Very serious. Wang Shuan, a professor at the China Agricultural University, believes that after entering the 21st century, the means of increasing grain production can no longer expand the area, produce a wide variety of crops and damage the environment.