关键词: 经济作物 种植结构 变化

Abstract:

According to the national data from 1998 to 2002 including farm crops, cash crops and non-cash crops, the types of the planting structure were defined, in which the types named increasing, increasing-lower decreasing, increasing-higher decreasing, decreasing for sown areas, the types named double increasing, single increasing, double decreasing for production and yield. The cash crops production has been developed because of the adjustment of agriculture structure. According to authors＇ analysis, the sown areas of cash crops in 24 provinces and the yields of cash crops in 25 provinces increased, the proportion of the cash crops sown areas increased by 1.4% from 1998 to 2002.The sown area and total output of cotton had a great fluctuation, the unit yield increased stably. The sown area, total output of oil crops increased. The sown area and total output of sugar decreased in the first three yearsand increased in the recent two years, the unit yield increased stably. The sown area of sugar has begun to concentrate in Guangxi, Yunnan. The sown area and yield of fiber crop increased, and the sown area has begun to concentrate in Heilongjiang, Xinjiang and Hunan. The total output and sown area of tobacco increased a little and regions moved to Yunnan, Guizhou and Henan. The sown area and total output of medicinal materials crops developed fast in all provinces of China. Through the agriculture structure adjustment, sown areas of cotton, sugar and tobacco in the cash crops have been decreased by 
3%, 1.5% and 0.7%. The sown areas of oil crops, fiber crops and medicinal materials increased 2.5%, 0.4% and 2.4%.

Key words: cash crops, planting structure, change