河南省人类活动净氮输入量与参数影响研究

为探究平原地区粮食主产区人类活动净氮输入量特征及其参数对估算结果的影响，以河南省为研究区，收集整理1990~2015年县级统计数据及NANI模型参数，对NANI的时空分布特征、变化趋势以及参数对估算结果的影响进行分析.结果表明：（1）时间尺度上看，1990~2015年河南省NANI呈升高趋势，1990、1995、2000、2005、2010、2015年NANI分别为14347、19146、21466、24251、23711、26156kg/（km²·a），化肥施用为主要贡献因子，占比为63.56%，其次是食品/饲料净氮输入量，占比14.81%；空间尺度上看，河南省NANI较高的县市主要分布在中部和东部的平原地区，而西部山地丘陵地区县市NANI较低.（2）NANI模型输入组分中受参数影响最大的是食品/饲料净氮输入量，与选用适宜参数估算结果相比较，该项变化范围在-23.1%~71.3%，作物固氮量变化范围在-31.2%~41.2%，化肥氮输入量变化范围在-2.8%~4.5%.

Net anthropogenic nitrogen input from human activities and its impacts from parameters in Henan Province

In order to explore the characteristics of net nitrogen input of human activities and the influence of its parameters on the estimation results in the main grain producing areas of plain area. The county-level statistical data from 1990 to 2015 in Henan province was collected and the relevant parameters of NANI model were selected and defined. The characteristics of temporal and spatial distribution, change trend and the influence of parameters on the estimation results of NANI were analyzed. The results show that:(1) From 1990 to 2015, the NANI of Henan province showed an increasing trend. The NANI of 1990, 1995, 2000, 2005, 2010 and 2015 were 14347, 19146, 21466, 24251, 23711 and 26156kg/(km²·a), respectively. For spatial variation, the counties with higher NANI were mainly distributed in the central and eastern plain areas, while the counties in the western hilly areas had lower NANI. (2) Among the input components of NANI model, the net nitrogen input of food/feed was the most affected by the parameters. Compared with the calculation and estimation results of selecting appropriate parameters, the variation range of this parameter was-23.1%~71.3%, the variation range of crop nitrogen fixation was -31.2%~41.2%%, and the variation range of fertilizer nitrogen input was -2.8%~4.5%.