县域水稻生产区域差异与增产效应OA北大核心CSTPCD

In order to clarify the regional differences of rice production in recent years in China and grasp the regional rice yield increase capacity,using national county-level sample rice production data(Data do not include those of Hong Kong,Macao and Taiwan regions.The same below),this study analyzed the regional differences in rice production capacity,and adopted the Logarithmic Mean Divisia Index to investigate the contribution of driving factors for rice yield increase in counties from both temporal and spatial dimensions.The results showed that:From 2016 to 2019,the rice production pattern in China showed an increasing trend in the north and decreasing trend in the south,with a significant increase in yield in the Sanjiang Plain in the northeast of Heilongjiang Province.The spatial distribution pattern of rice planting area and total yield in the county was relatively close.At the national level,the planting area and yield jointly promoted the growth of rice yield,but the cumulative effect of yield per unit area contributed more than 93％,and the contribution of planting area was relatively small;The driving force of increasing yield per unit area on rice production in the time dimension was gradually increasing,while the effect of planting area was gradually weakening and transforming into a yield reduction effect.Regionally,the overall rice yield in the Northeast Plain region displayed an increasing trend,with the main driving factor was the planting area;The decrease in rice yield in the middle and lower reaches of the Yangtze River and the coastal areas of South China was mainly dominated by the sowing area;The rice yield in the Huanghuaihai region was increased,which was driven by the combined effects of planting area and yield per unit area;The rice yield in the southwest region showed a downward trend,and both the planting area and yield had a negative inhibitory effect.Therefore,on the basis of stabilizing the rice planting area,the Northeast Plain region should deeply explore the potential for yield improvement;The middle and lower reaches of the Yangtze River and the coastal areas of southern China will continue to strengthen yield improvement,accelerate the construction of high standard farmland,build suitable combinations of early and late rice varieties,and strengthen the protection of high-quality rice fields around the city;and the construction of reservoirs in the southwest region should be strengthened to solve the problem of seasonal water shortage.