河南省人类活动净磷输入的时空变化与影响参数

为探究河南省人类活动净磷输入状况,基于河南省18个省辖市(县辖市)行政单元统计数据,利用人类活动净磷输入量(NAPI)模型,核算河南省1990、1995、2000、2005、2010、2015和2019年人类活动净磷输入量.结果表明:在时间尺度上,1990～2015年河南省NAPI整体呈升高趋势,2015～2019年略...

Spatio-temporal variation and the impacts from parameters analysis of net anthropogenic phosphorus inputs in Henan province

In order to explore the status of net anthropogenic phosphorus input in Henan province, this study was based on the statistics data of 18province-administered towns and used the net anthropogenic phosphorus input (NAPI) model to calculate the phosphorus flow in the province from 1990~2019. NAPI of Henan Province had an overall upward trend from 1990 to 2015 and a slight decrease from 2015 to 2019. However, the NAPI of Henan Province was always higher than the national average in China, with an average annual growth rate of 2.86%. On a spatial scale, the east was higher than the west, and gradually decreased in a radial pattern to the north, west, and south. The main cities that affected NAPI in Henan Province are the Zhoukou, Xuchang, Shangqiu, Puyang, and Luohe cities, accounting for 47.05% of the total NAPI in Henan Province. A detailed analysis demonstrated that phosphate fertilizer application was the main contributor to NAPI, with the average annual contribution rate of 85.78% that was highly correlated with NAPI (R²>0.8). The second and third most important sources were food/feed and non-food inputs, accounting for 10.63% and 2.56%, respectively. Furthermore, among the input components of the NAPI model, the net phosphorus input of food/feed was most affected by the parameters, where its variation ranged from -23.48% to 66.81%; The second input was fertilizers, which varied in a range of -1.76% to 3.52%, affected by the parameters; The higher the proportion of components in the NAPI model, the more sensitive their parameters are, and the sensitivity index of the parameters contained in the P_fer components is higher than that of P_im and P_nf.