Oneffects of fertilizer zero growth action and the decoupling of fertilizer non-point source pollution and agricultural output value——Taking Huangshi as an example
Chemical fertilizers play an irreplaceable role in promoting the food and agricultural production,but irrational use of chemical fertilizers will bring serious non-point source pollution(NPSP).With data on the amount of chemical fertilizers applied from 2000 to 2021 in Huangshi as the sample,this paper explored the effects of fertilizer zero growth action,the decoupling relationship between fertilizer NPSP and agricultural output value and the influencing factors of fertilizer NPSP by using the grey prediction GM(1,1)model,decoupling model and Kaya identity decomposition model,so as to provide theoretical guidance for agricultural production practice in Huangshi.The results showed that after the implementation of fertilizer zero growth action,the input of nitrogen fertilizer,phosphate fertilizer and compound fertilizer in Huangshi showed a yearly decrease,among which the reduction of nitrogen fertilizer input was the most significant.In the meanwhile,the total nitrogen(TN)and total phosphate equivalent emissions caused by chemical fertilizers decreased significantly and the reduction of TN equivalent emission was more significant.For the first 15 years from 2000 to 2015,chemical fertilizer NPSP and agricultural output value in Huangshi mainly displayed a weak decoupling relationship,while for the last 7 years from 2015 to 2021,it mainly presented a strong decoupling relationship.It implied that agricultural production had a lower dependence on fertilizer input in Huangshi.Generally,there are mainly three factors influencing equivalent emissions of chemical fertilizer in Huangshi,namely,emission coefficient,chemical fertilizer consumption intensity and crop planting area.In districts and prefecture-level cities in Huangshi,fertilizer consumption intensity was presented as a positive driving factor while the crop planting area was shown as a negative driving factor for equivalent emissions of chemical fertilizers.The contribution of the three factors mentioned above to equivalent emissions of chemical fertilizers had been shifted from positive driving to negative driving during 2000-2021.
chemical fertilizernon-point source pollutiongrey predictiondecouplingdecomposition model
NETL
NSTL
万方数据
