扬州市粮食作物生产潜力研究

Study on Production Potential of Food Crops in Yangzhou City

对潜力递减法的基本参数逐个研究,给出各个参数的取值或者是具体的计算模型,计算扬州市粮食作物玉米、水稻和小麦的生产潜力。结果表明,光能利用率取3.51%,水稻、小麦、玉米的经济系数分别取0.50、0.40、0.35,在最差气候条件下生产潜力与平均状态分别相差4%、4%和2%,最佳气候条件下,分别比平均条件高3%、7%和2%,相差在较低的水平上,且产潜比都是在30%左右,验证了所选参数适合应用于计算扬州市粮食作物生产潜力的计算。扬州市粮食作物的生产潜力平均在20 751～21 709、26 239～27 954、15 857～17 611 kg/km2,增产潜力大,温度和土地质量是主要的限制因子。

Based on the study of potential modification method＇ s parameters, the values of various parameters or specific computing model were given. The potential productivity of corn, rice and wheat in Yangzhou City was calculated. Taking light energy utilization rate as 3.51%, economical coefficient of rice, wheat and corn as 0.50, 0.40 and 0.35 resp. , the productive potential was 4% , 4% and 2% lower than average level respectively under the worst weather conditions. Under the best climate conditions, the productive potential was 3% , 7% and 2% higher than average level. The difference was at very low level and the actual production was 30% of potential production, so the selected parameters were suitable for calculating the production potential of food crops in Yangzhou City. The potential for the production of food crops were 20 751 -21 709, 26 239 -27 954, 15 857 - 17 611 kg/km2, potential output was large, temperature and soil quality were the major limiting factors.