关键词:
Agricultural production
Environmental impact evaluation
Fertilizer
Life cycle assessment
Pesticide
摘要:
Purpose Evaluate environmental load of the agriculture industry by taking Chongming Island of Shanghai as a case study. Propose feasible approaches to reduce the environmental impact of agriculture industry based on the research findings. Methods The research boundary of our study covers from raw material extraction to agriculture product (cradle to product). Two stages are identified based on life cycle thinking: agricultural material production and planting process. In the agriculture material stage, we evaluated the consumption of agricultural machinery and equipment for diesel, gasoline and electricity;then, the embodied environmental impact of these energy sources are calculated based on life cycle assessment (LCA). For the planting stage, we calculated the environmental impact caused by agriculture sowing, fertilizing, and spraying of pesticides also according to the LCA method. Results and discussion The environmental impacts of Chongming Island in 2015 are found as ecosystem damage (2.44E+11 species year), human health (2.86E+10 DALY), and resources consumption (1.15E+09 $). The primary environmental impacts in the agricultural material production stage are revealed as marine ecological toxicity (1.01E+06), freshwater eutrophication (5.26E+05), and human toxicity (4.04E+05), of which 90% of the impacts are caused by the production of nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer. The main environmental impacts in the agricultural planting stage are freshwater ecotoxicity (1.27E+06), freshwater eutrophication (7.70E+05), and terrestrial ecotoxicity (7.70E+05), which are mainly caused by pesticide residues and loss of nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer. Conclusions The results of the environmental impact analysis of the Chongming agricultural production of 2008-2015 showed that there was a significant decline trend in 2011 and 2012, mainly due to the significant reduction in the use of nitrogen fertilize