EVOLUTION AND INFLUENCING FACTORS OF THE SPATIAL PATTERN OF GRAIN PRODUCTION IN THE HUANG-HUAI-HAI PLAIN
To accurately grasp the evolution characteristics and influencing factors of the spatial pattern of grain production in the Huang-Huai-Hai Plain,and optimize the grain production pattern in the Huang-Huai-Hai Plain.The Logarithmic Mean Divisia Index model was used to decompose and compare the influencing factors of grain output change in the seven provinces(cities)involved in the Huang-Huai-Hai Plain from 2003 to 2021,and the influences of grain total output,cumulative effect of grain yield per unit area and grain planting structure on grain yield increase were analyzed.The results were listed as follows.(1)The total grain yield in the Huang-Huai-Hai region showed a rising trend in general,and the spatial pattern of grain yield increase shifted from the western region to the eastern region;(2)The main factor of grain yield increase was the cumulative effect of yield per unit area.The grain output in the Huang-Huai-Hai Plain increased steadily from 2004 to 2016,and the grain planting area had a positive impact on the grain yield increase for 13 consecutive years,but the effect showed a weakening trend,and starting from 2017,the grain output increase began to have a negative impact.(3)From the perspective of planting structure,maize sowing area effect and wheat yield effect had obvious effects on grain yield increase.The increase of rice yield in Jiangsu and Anhui provinces shifted from relying on sown area to increasing yield per unit area;Henan and Shandong province had strong wheat production capacity,and the improvement effect of wheat yield per unit area was remarkable.The reduction of corn planting area affected the overall corn yield,and Henan,Shandong and Hebei provinces were greatly affected,but Hebei province had a significant increase in corn yield per unit area;The provinces of increasing legume production were transferred from Anhui to Henan province with high yield per unit area and Shandong province with increasing planting area.The yield of potato in Shandong,Jiangsu and Anhui was negatively affected by the yield effect.Therefore,it is necessary to improve grain support policies,raise the level of breeding,optimize planting structure,do disaster prevention and mitigation,and continuously explore new ways to increase grain yield.
Huang-Huai-Hai Plaingrain productionspatial patterngrain production increaseLogarithmic Mean Divisia Index(LMDI)
NETL
NSTL
万方数据
