Food security is a goal and means of global sustainable development, and an important component of China’s national security. Based on grain production data from 2000 to 2020, 31 provinces (cities, autonomous regions) in China were used as research units to analyze the spatiotemporal differences and driving forces of grain production in China using a combination of local correlation index, center of gravity transfer model, and geographic detector. The results as follows, ① During the research period, China’s total grain production showed a decrease followed by an increase, and the yield per unit area of grain showed an increasing trend. Corn has become the "largest staple food" in China; ② During the research period, the focus of China’s grain production continued to shift northward, with Heilongjiang, Henan and Shandong provinces becoming the main grain production areas, with Henan being the province where China’s grain production center was located. Among the factors affecting grain yield, the effective irrigation area (0.971) has the strongest explanatory power. Finally, countermeasures and suggestions were proposed from five aspects, stabilizing grain production, reducing grain inventory pressure, implementing regional grain security responsibilities, improving grain circulation efficiency, promoting high-quality grain engineering construction, adjusting grain production structure, strictly implementing farmland protection responsibilities, scientifically applying pesticides, fertilizers and other production materials, emphasizing agricultural infrastructure construction and stabilizing the number of agricultural labor force.

Economic and social factors pose an enormous threat to forest ecological security, which in turn affects the development of ecological civilization. This paper applies a geographically weighted regression model to study the impact of urbanization, industrial structure, and foreign direct investment on forest ecological security of 30 provinces in 2013 and 2018 and reveals the spatial differences of various influencing factors in different provinces. First, the overall forest ecological security in China is at an average level, with slight improvement. Second, urbanization has the greatest impact on forest ecological security in all provinces, which shows a rising trend. Third, the positive impact of industrial structure on forest ecological security has improved. Fourth, in 2013, FDI (foreign direct investment) had a negative correlation with forest ecological security. In 2018, FDI had a positive impact on the forest ecological security index of 16 provinces, while it had a negative correlation in other provinces. Therefore, it is necessary to formulate a coordinated security improvement plan for neighboring provinces. The government should promote rural revitalization, plan the layout of cities rationally, increase the proportion of tertiary industry, appropriately raise access barriers to foreign investment and strengthen environmental supervision over existing foreign-invested enterprises.

Based on summarizing the factors that influence consumers’ purchasing of fruits and vegetables, by establishing the theoretical framework that describes the factors influencing the behavior of purchasing enterprise brand fruits, designing the questionnaire, collecting data, and analyzing the data of 312 consumers by binary logistic regression, this article finds that there are mainly 6 factors influencing the behavior of purchasing enterprise brand fruits, namely, gender, the convenience of purchase, taste, evaluation after tasting, tasted or not, and whether relatives or friends buy. Among them, the first four factors have a positive effect, while the last two have a negative effect. The biggest influential factor is whether relatives or friends buy, followed by tasted or not, the third is an evaluation after tasting, and the fourth is the convenience of purchase. Taste and gender are, respectively, ranked fifth and sixth. Based on the above conclusions, this article puts forward some countermeasures and suggestions, which can be listed as follows: to expand the marketing channels of enterprise brand fruits, to improve the convenience of purchase, to improve the quality of enterprise brand fruits, to pay attention to the improvement of taste, to give full play to the publicity role of the government and enterprises, and to improve the popularity of enterprise brand fruits.