Environmental Impacts Derived From Nitrogen And Phosphorus Flows In Agricultural Production System Of Anhui Province

Nitrogen and phosphorus play an important role in agricultural production.Frequent human activities seriously interfere with the social metabolic system of nitrogen and phosphorus,causing serious pollution problems.Therefore,it is necessary to analyze the environmental impact of nitrogen and phosphorus in agricultural production systems.In this study,nitrogen and phosphorus flows in agricultural production systems,including planting and aquaculture,were studied.The life cycle assessment method was used to construct an environmental impact analysis model for nitrogen and phosphorus in agricultural production systems.Quantitative analysis of fertilizer production—crop cultivation and livestock and poultry farming The resulting energy consumption,global warming,acidification and eutrophication.Taking Anhui Province as an example,the paper analyzes the impact of nitrogen and phosphorus on agricultural production in Anhui Province from time and space,and proposes an optimization plan for agricultural nutrient management.The main findings are as follows:1.The environmental impact index of the production of 1t crops in Anhui Province is in the order of rapeseed,soybean,wheat,corn,rice.The environmental impact index of the production of 1t livestock and poultry products in Anhui Province is in the order of beef,mutton,poultry eggs,pork.From 1990 to 2015,the comprehensive environmental impact index(EII)of 1 t wheat,soybean,rape,beef and mutton production showed a fluctuating downward trend,with an increase of 0.17 for rice and 9.39 for poultry eggs.Eutrophication,acidification,global warming and energy consumption are the environmental impacts of each agricultural production process from high to low.2.In the agricultural production activities of the cities under the jurisdiction of Anhui province in 2015,Fuyang,Suzhou and Bozhou are in the forefront of the overall comprehensive environmental impact index and the comprehensive environmental impact index of unit area,the environmental load is serious.While the comprehensive environmental impact index of Huangshan and Chizhou is low.The environmental impact load caused by agricultural nitrogen and phosphorus flows in the northern region is more obvious than that in the central and southern regions.3.The production activities of rice,wheat,pigs and poultry are important factors that have caused the impact of agricultural nitrogen and phosphorus in most cities.The contribution rate is above 55.00%.The energy consumption of planting industry in Anhui Province is much higher than that of aquaculture,accounting for 85.47% of the total energy consumption of agricultural production.The prominent problem in the aquaculture industry is eutrophication,and the average contribution rate of eutrophication in the aquaculture industry is 62.65%.4.The most important thing in the planting industry is rational fertilization.Through the methods of soil testing and other methods to determine the reasonable amount of fertilizer,play a role in saving costs.The aquaculture industry needs to vigorously improve the manure disposal technology and improve related supporting facilities,reduce the environmental impacts caused by the random disposal of manure,and promote the sustainable development of agriculture and animal husbandry.Figure 27;Table 9;Reference 127...