Uses of the Geographical Detector Method to Analyse Spatiotemporal Changes and Impact Factors Related to Chinese Food Security

The issue of Chinese food security has attracted close attention from within China as well as from abroad. In this study, grain surplus was used to measure food security. The grain surplus of 340 cities in China was calculated. Cities were used as research units; and agricultural areas were used as regional units to study spatial distribution of Chinese food security. The geographical detector method was used to analyze 10 impact factors of food security in China, and the leading factors of each agricultural region were determined. According to the spatial pattern of Chinese food security and the influence of the 10 impact factors on each agricultural region, corresponding measures should be taken for each of China's different agricultural regions. According to the research result, the black soil should be protected to prevent loss of water and soil erosion in northeast China, the enthusiasm of agricultural production should be raised in south-eastern coast China.