Temporal and Spatial Variation of Grain Production in Jiangsu Province and Its Influencing Factors

In order to study the temporal and spatial variation of grain production of agricultural land in Jiangsu Province and its influencing factors,this article researches the spatial patterns of grain yield and the total output of agricultural land in 2000 and 2006 in Jiangsu Province and their changes between the two years,and analyses the impact of human factors and meteorological factors on grain yield of agricultural land by statistical method and special analysis of GIS.The result shows that the difference in spatial distribution of grain yield of agricultural land presents the pattern of constant from south to north in Jiangsu Province.This pattern has remained unchanged between these two years,however,as demonstrated in recent years,the grain yield of agricultural land has increased in northern and central parts more than that in the southern part of Jiangsu Province,and grain yield advantage in the southern part has gradually disappeared.The central part becomes another high-value area of grain yield in Jiangsu Province,and in some localities it is close to the level of grain yield in southern Jiangsu.Lianyungang City witnessed the greatest increase of grain yield.The increase rate of grain yield in 2006 is between 1286 and 1797 kg/hm2 compared with that in 2000.Nanjing and Zhenjiang experienced the greatest reduction of grain yield,with the rate reaching 254-612 kg/hm2.The distribution of total grain output in 2000 shows a pattern of multi-center of the high value area,which is mainly distributed in the northern and central parts,but after 2006,the high value area of total grain output in the northern and central parts became a continuous area.Meanwhile,all other high-value area of total grain output disappeared.The pattern of total grain output in recent years shows that it is reducing in southern Jiangsu while increasing in northern and central Jiangsu.The greatest increase is in northern Jiangsu and the greatest reduction is in the southern.Human influencing factors and precipitation change are the main influencing factors of the change in spatial pattern of the grain yield in Jiangsu in recent years.The relevant departments need to pay attention to the variation of the spatial and temporal patterns of grain production,and this research can provide a basis for decision-making.