Life Cycle Environmental Influence Of Wheat Production In Shanxi Province

Currently, the overall yield of wheat in Shanxi province showed a declining trend, and appeared the environmental issues of food security and the excess of nitrogen fertilizer application. Because of the wheat is one of the major crops in the province, in the premise of resource consumption and environmental impact caused by the process of wheat production in Shanxi Province, discussed how to improve the agricultural production and reduce environmental influence in effective way has significance scientific significance. In this paper, as the object of study in wheat of Shanxi province, use the questionnaires of farm management date、the meteorological data and soil date of Shanxi province as the basic data, base on using DNDC model simulate environmental emission in planting process of wheat, building the Life cycle emissions listing of pollutant in wheat-growing process. We discussed the main planting area of Winter Wheat in Shanxi province in different climate, soil and farmland management measures under the environmental impact potential of Wheat Resources and its main factors based on the production of It wheat grain as the evaluation of the basic unit. The analysis results are as follows:1.During the process of wheat nitrogen input space distribution characteristics from the point of view of Shanxi province, Yuncheng, Linfen, Jincheng belong to high nitrogen fertilizer application areas. Especially in Yuncheng, the amount of nitrogen fertilizer was as high as 463.25kg.ha-1. Fertilization rate in Changzhi, Jinzhong, Lvliang is relatively low, the average amount of nitrogen applied in 280kg/ha-1 or so. Above all, the whole amounts of fertilization of wheat are high in Shanxi. Along with the high fertilizer input, it also brings a lot of environmental pollution emissions2.Comparing the urban environmental potential of six different cities which grow wheat, the environmental impact index were as follows in turn:Yuncheng,0.4186; Jincheng,0.3940;Linfen,0.3684; Jinzhong,0.3472; Changzhi,0.3418; and Lvliang,0.3007. To find out that the most important aspect to impact the environmental potential is the cultivation segment.3.In the six cities, the resource environmental influence degree of wheat production cycle was: eutrophication 0.6643, acidification 0.4424, land use 0.2841, greenhouse 0.1103 and energy consumption 0.0612, and eutrophication was the largest environmental potential of wheat production in Shanxi province. Comparing with the world per capita potential environmental impact in 2000, potential environmental index of eutrophication accounted for 39.3～45.8%. Eutrophication was mainly caused by nitrogen volatilization in the way of Nitrogen fertilization.The potential environmental index of eutrophication could be reduced by 43.4%～76.6% by changing surface application into hole application fertilizer.4.The influence factor which places an important role in improving the life cycle of wheat are the amount of nitrogen and the mode of fertilization. With the reduction of nitrogen, the amount of CO,CO2 in agricultural stage and the quantity of NH3 and N2O in planting stage were also decreased efficiently. So reducing the nitrogen application as well as improving the nitrogen utilization are the keys to control the environmental pollution.