改革开放以来,中国农业面貌发生了日新月异地变化。1 997年稻谷总产突破2亿t之后,政府继续推行“四分、三化、二扶、一改”和“稳量调质”政策,进行种植结构的调整,近年来产量稳定在1 8亿t左右(如图1 )。基本形成了华南食用籼稻区,华中多用籼、粳稻区,西南高原多用籼、粳区和 Since the reform and opening up, the agricultural landscape in China has changed rapidly with each passing day. After the total output of rice exceeded 200 million tons in 1997, the government continued to implement the “four quarters, three reforms, two reforms, one change” and “steady adjustment” policies to adjust the planting structure. In recent years, the output has stabilized at 18 About 100 million t (Figure 1). Basically formed the South China’s indica rice area, central China multi-purpose indica, japonica rice area, Southwest Plateau Indica, Japonica and