| The traditional pollution load measurement is difficult to meticulously characterize the spatial and temporal heterogeneity of pollution load,and can not meet the needs of accurate pollution control.Agricultural pollution source inventory analysis is an effective method to describe pollutant emission characteristics from the perspective of human activity sources.However,for a long time,the water pollutant discharge list is mainly based on the demand for total accounting,and most of the time-sensitive macro statistics are used.The spatial representation can only be implemented at the administrative division level.The spatial and temporal resolution is not high,and the regional pollution cannot be accurately described.The spatio-temporal pattern of emissions and the identification of high-load sensitive periods and regions have not been able to meet the current demand for precise pollution control.In this study,the non-point source pollution sources of agricultural activities in the Wangfu River Basin were studied.Based on the on-site sampling and monitoring,the non-point source pollution load of agricultural activities in the Wangfu River Basin in 2017 was calculated,and the non-point source pollutants of agricultural activities in the basin were calculated.Features are analyzed.Research indicates:The main sources of pollution from non-point source pollution of agricultural activities in Wangjing River Basin in 2017 are paddy field drainage and livestock and poultry breeding.The non-point source pollutants are COD,NH3-N,TN and TP,among which COD,NH3-N,TN and TP The emissions are 142.5 tons,5.7 tons,16.8 tons and 2.4 tons respectively.In the discharge of COD,NH3-N and TN,paddy field drainage is higher than livestock and aquaculture,and paddy field drainage contributes 46.74%,82.31%,53.20% of total COD,total NH3-N and total TN..In TP emissions,livestock and poultry farming is higher than paddy drainage and aquaculture,and livestock and poultry farming contributes 58.85% of the total TP.In 2017,the main source of pollution from non-point source pollution of agricultural activities in Wangfu River Basin was Xishan District.The pollution of non-point source pollutants of agricultural activities was COD,NH3-N,TP and TN,which were 17,637 tons,4002 tons,17,106 tons and 3,130 tons respectively.,accounting for 77.3 %,68.4 %,78.9 % and 83 % respectively.Among the COD,NH3-N,TN and TP emissions,the distribution of the streets/towns in the basin is the highest in the Yangjian Town.Based on the above analysis,this study proposes the following countermeasures from the perspective of emission reduction and pollution control:(1)Optimize the amount of fertilizer applied according to the growth characteristics of local crops,fertilizer requirements,soil fertility performance and regional characteristics of agricultural production.,use fertilizer ratio,fertilization time and application method to improve fertilizer utilization rate;(2)actively promote the intensive breeding of livestock and poultry on the basis of limiting the expansion of livestock and poultry breeding,improve rural energy structure,and expand specialized culture of livestock and poultry manure It is used for other resource-based approaches such as feed and sales,and at the same time,it increases the proportion of pollutant treatment facilities and strengthens the comprehensive management of livestock and poultry waste;(3)strengthens the training of environmental protection knowledge and environmental protection skills for farmers and farmers,and advocates scientific farming and science.Breeding,reducing pollutants from the source;(4)The local agricultural sector and the environmental protection department further strengthen environmental publicity and expand the participation of residents in environmental supervision.Figure 24 table 13 reference 72... |
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