The Major Food Crops in Response to Climate Change and Its Yield Effect in Northeast of China

This article reviewed the effect of climate changes on the variation of agricultural climate resources, characteristics of agricultural disaster and the response of the main crops in Northeast China under the condition of global warming. The results showed that there were advantages and disadvantages to the effects of climate warming on agriculture of China. The growing temperature in main crop season in North-east China, the increasing of heat resources, the extended growth period and the expansion of region suitable for crop, which were potential possible for raising the output of crop production and light-temperature potential productivity. Because of the light and the limitation of water resources and the increase of CO2 concentration which were caused by the greenhouse effect, the yield and quality of the crop had a negative effect. With extreme weather events increasing, agricultural ecological environment deterioration, drought, flood and waterlogging, salinization speed, the most obvious effect was drought disaster in Northeast China, especially for the effect of global warming in recent years. With the to-tal amount of precipitation reduction and precipitation uneven distribution, the Northeast China became one of the most sensitive and vulner-able areas affected by climate change.