| Agriculture is the foundation of human survival and development, crop production is the foundation of agriculture, which can guarantee social needs. Therefore, the analysis of characteristics and capacity with crop production sustainability has fatal research significance. However, researchers generally only consider economic and social benefits at present but idea with little consideration of ecological environment benefit, this is mainly because crop production's influence on environment has been a difficult problem. So, the paper tries to make a breakthrough in researches of the production of planting industry, and searches for the scientific solution to the puzzles.Based on this, the paper uses the improved ecological footprint method in order to find a more scientific and reasonable method to study on crop production sustainable development status, from the angle of comparison that crop production natural resources use, energy consumption and waste discharge whether have exceed capacity of ecological environment. The application can show the crop production eco-footprint and local ecological carrying capacity, as well as reflect crop production sustainable development ability. The method is proposed to supplement the current researches, which analyze crop production without considering the eco-environment aspect. Beside, there are inter-regional trade activities of crop products. The amounts of crop products which were produced and the amounts of crop consumption maybe were not equal. So the paper put forward the concept of the crop consumption eco-footprint in order to evaluate the ecosystem pressure of crop consumption. Based on the practical significance of the crop production eco-footprint and the crop consumption eco-footprint, the author made a comparison between the two concepts, from which we can put forward suggestions for the local crop planting. The results can be used as important reference index in planting ecological impact assessment, from which we can establish sustainable development target and make relevant policy.This paper takes use of the improved ecological footprint method and analyzes the status of crop production and crop consumption in Jiangsu province; based on the evaluation result we get these conclusions:First, the crop production of the thirteen prefecture-level cities in Jiangsu province was all in the situation of ecological surplus in 2007, as well as the crop production of Jiangsu province in 1998-2007. The resources consumption of the crop production is relatively safe now. The regional ecological capacity can maintains the balance of crop production system and realize the sustainable of crop production. At the same time, the paper makes the space-time difference evaluation. The trend of the crop production eco-footprint per unit output value is wavelike raised, which show that the crop production of Jiangsu province neglect the importance of environmental protection and the ecology economy synthesis benefit is not high. The crop production eco-footprint per unit output value is the least in Nan Jing, as well as the crop production eco-footprint per unit output value is the largest in Lian Yun-gang. The crop production ecological sustainable index is in the range of 0.5-0.75, which shows that the resource utilization of crop production is in the weak sustainable state.Second, the trend of the crop consumption eco-footprint is wavelike raised because of more and more big crop products consumption demands. The crop consumption of Jiangsu province was all in the situation of ecological surplus in 1998-2007. It shows that the natural capital of Jiangsu province can meet the crop consumption demands. There are great differences of the crop consumption eco-footprint among the thirteen prefecture-level cities in Jiangsu province. The crop consumption eco-footprint is the largest in Su Zhou, while the crop consumption eco-footprint is the least in Zhen Jiang. The crop consumption of Nanjing, Wuxi, Changzhou and Zhenjiang in southern Jiangsu was in the situation of ecological deficit in 2007, as well as the crop consumption in the other cities was in the situation of ecological surplus.Third, the paper makes the breakeven analysis of the crop production eco-footprint and the crop consumption eco-footprint. In recent ten years, the crop production eco-footprint is larger than the crop consumption eco-footprint of Jiangsu province in 2001,2002, and 2004, as well as the crop production eco-footprint is less than the crop consumption eco-footprint of Jiangsu province in the other years. The crop production eco-footprint is larger than the crop consumption eco-footprint in Xu Zhou, Lian Yun-gang, Huai an, Yan Cheng, Tai Zhou, Su Qian. The crop production eco-footprint is less than the crop consumption eco-footprint in Nan Jing, Wu Xi, Chang Zhou, Nan Tong, Yang Zhou and Zhen Jiang. When the crop production eco-footprint is less than the crop consumption eco-footprint, it shows that the regional crop products can not meet the demands of crop consumption and need to import some crop products, which exercise pressure to other places indirectly. When the crop production eco-footprint is larger than the crop consumption eco-footprint, it shows that the regional crop products can not only meet the crop consumption demands but also can export some crop products. These crop products are consumed by other areas, but the produce pressure of these products are applied in Jiangsu. Besides, maybe there are resource wastes because of the low efficiency resource utilization that caused the higher crop production eco-footprint. |
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