China, as a large agricultural country as well as a major country with great demand for grain, has played a more and more important role in the international grain market. As Northeast China is one of the major commodity grain bases in China as well as one of the regions with the highest intensity of human activities, it plays an important role in influencing the global food security. This study first generally analyzed the cultivated land reclamation and the climate change of temperature and precipitation in Northeast China during 2000–2010. Then, on the basis of these data, the climatic effects of cultivated land reclamation in Northeast China during 2030–2040 were simulated by the weather research forecast (WRF) model. Finally, the possible effects of the climate change on the grain yield and the potential influence on the food security were analyzed. The simulation result indicated that the temperature in Northeast China would be increasing on the whole, while the precipitation would be decreasing. The result of this study can provide some theoretical support to the agricultural economic development in Northeast China and serve the national macropolicy and food security strategy of the whole China. 1. Introduction Northeast China as an important commodity grain production base in China plays an important role in guaranteeing the global food security, while the historical large-scale cultivated land reclamation is of great importance to the formation and development of this commodity grain production base. Northeast China currently provides 30–35 million tons of grain every year, accounting for 13% of the national total grain output [1]. Besides, China being a large agricultural country, as well as a major country with great demand for grain, plays a very important role in the international grain market. According to the Medium and Long Term Planning Outline of National Food Security (2008–2020), the grain output of China will have reached 545 billion kg by 2020. Northeast China as the core region of grain production of China will undertake the tasks of making the grain output increase by 15.05 billion kg, which will account for 30.1% of the newly increased grain output. Therefore, the grain production in Northeast China will have great impacts on the Asian and even the global food security [2, 3]. The cultivated land reclamation in Northeast China has lasted for many years since the last century due to the continual population growth and economic development at the cost of large-scale overconsumption of resources [4]. As a result, the frequent and
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