Spatial-Temporal Changes and Driving Mechanism of Per Capita Grain Possession in Counties of Beijing-Tianjin-Hebei

Food security has been focusing extensively home and aboard in recent years. The core issue of food security was whatever the food production could meet the food demand of resident population in a region. Per capita grain possession directly reflected the relationship of food supply and demand. In order to analyze food security situation and put forward proposals to Chinese sustainable agricultural development, this study aims to determine how the spatial-temporal distribution of per capita grain possession changed in counties of Beijing-Tianjin-Hebei region from 2011 to 2015. According to Chinese situation and the per capita nutrition standardization published by FAO, 400kg food was the per capita food consumption meeting nutritional requirements per year. According to this standard, if per capita grain possession per year reached 400kg in a region, this region was considered food security region. In this study, the per capita grain possession of counties was calculated in Beijing-Tianjin-Hebei region from 2011 to 2015, and the map of per capita grain possession of counties from 2011 to 2015 in Beijing-Tianjin-Hebei was drawn to show the spatial-temporal changes of food security. Using gravity center method, the spatial gravity center of per capita grain possession from 2011 to 2015 were calculated, and the map of moving path of gravity center was drawn to research the spatial-temporal changes of per capita grain possession. According to research result, policy suggestions of regional agricultural development was put forward.