为解析中国人为净氮输入(NANI)和人为净磷输入(NAPI)的来源和空间分布,本研究构建了中国市域NANI和NAPI模型,核算了 2020年中国367个市域单元NANI和NAPI,并采用标准差椭圆方程和莫兰指数对其进行空间异质性分析.主要结论为:①2020年中国NANI和NAPI分别为4596.43 kg N/(km2.a)和840.02 kg P/(km2·a);②化肥施用是NANI和NAPI的主要贡献源,其中80.93％、89.65％的市域单元分别为其最大贡献源;③中国NAN1和NAPI空间分布具有明显的聚集性和异质性,以胡焕庸线为界,东南部地区的NANI和NAPI明显高于西北部,聚集区域主要分布在华北平原地区.NANI和NAPI模型是一种定量评估区域内氮磷排放状态的模型,能够为中国氮磷污染重点区域的识别、污染治理等提供技术支撑.
Net anthropogenic nitrogen and phosphorus input and its spatial heterogeneity at urban scale in China
To analyze the sources and spatial distribution of net anthropogenic nitrogen input(NANI)and net anthropogenic phosphorus input(NAPI)in China,this study constructed regional the NANI and NAPI models for 367 urban units in China in 2020.The study utilized standard deviational ellipse and Local Moran's Index for spatial heterogeneity analysis.In addition,this study also conducted 10000 Monte Carlo simulations on the model parameters to analyze the uncertainty of the model.The main conclusions are as follows:1)In 2020,the NANI and NAPI in mainland China were 4596.43 kg N/(km2·a)and 840.02 kg P/(km2·a)respectively;2)The application of chemical fertilizers was the primary contributor to NANI and NAPI,with 80.93％and 89.65％of the urban units being their largest contributors,respectively;3)The spatial distribution of NANI and NAPI in China exhibits significant clustering and heterogeneity.The areas to the southeast of the Hu huanyong Line have notably higher NANI and NAPI compared to the northwest,with aggregation mainly occurring in the North China Plain region.4)When the coefficient of variation of the parameters is 30％,the average relative errors of NANI and NAPI are 7.3％and 13.6％,respectively,indicating good simulation results.The NANI and NAPI models serve as quantitative tools for assessing the nitrogen and phosphorus emission status in a region,providing technical support for the identification and management of nitrogen and phosphorus pollution in key areas of China.
net anthropogenic nitrogen inputnet anthropogenic phosphorus inputcontribution analysis
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