浙江省农用化肥时空分析及环境风险评价

基于化肥投入强度、使用效率和安全阈值的概念,利用农田化肥使用的环境风险评价模型,分析了浙江省1978—2017年农用化肥情况.结果表明:浙江农用化肥总量和耕地化肥使用强度从1978年到2017年呈现先升高再降低的趋势,地区间存在明显差异.2017年,浙江省农用化肥风险指数为0.69,处于中度风险,其中钾肥使用处于低风险...

Environmental Risk Assessment and Spatial-temporal Features of Fertilizer Utilization in Zhejiang

Based on the fertilization intensity, environmental safety threshold and fertilization efficiency, a model of environmental risk assessment was adopted to analyze the spatial-temporal features of chemical fertilization in Zhejiang Province from 1978 to 2017. The results showed that the total amount and the intensity of fertilizer used in cultivated land of Zhejiang increased and then decreased from 1978 to 2017, and obvious differences existed in different areas. In 2017, total environmental risk index due to fertilizer use was 0.69, which was at a medium risk level. The environmental risk index of potassium fertilizer application was at low level, and that of nitrogen and phosphate fertilizer application was at medium level. The environmental risk index of fertilizer application in Huzhou and Zhoushan was at a safe level, and that of other regions of Zhejiang Province was at medium level. The nitrogen fertilizer application of 2 cities and potassium fertilizer application of 3 cities were at severe risk level. It is suggested that scientific fertilization technologies should be studied to reduce environmental risks and increase fertilizer use efficiency.