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| Dilemma and prospect of modelling in agricultural non-point source pollution in China |
| Received:August 31, 2022 |
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| KeyWord:non-point source pollution model;field loss process;watershed transportation process;multiple water bodies;migration pathway |
| Author Name | Affiliation | | XIA Yongqiu | Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | ZHAO Di | Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | YAN Xing | Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | QIU Jie | Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | YAN Xiaoyuan | Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
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| Abstract: |
| Agricultural non-point source pollution is still serious in China, and model is an effective tool for decision-making support for the prevention and control of non-point source pollution. Based on the classification of agricultural non-point source pollution models, this paper systematically concludes the construction methods of various models in the processes of nutrient loss from field, and transfer and removal in watershed. In the simulation of nutrient loss from field, most models adopt single excess infiltration or excess storage only. In modelling of nutrient transfer and removal in watershed, nutrient is traced based on D8 algorithm, and removal is simulated by using a fixed coefficient. Based on the understanding of non-surface source pollution, this paper further summarizes the challenges in the modelling of agricultural non-surface source process. In the process of nutrient loss from field, the model should be built including both excess infiltration and excess storage processes because of the coexistence of dry land and paddy land. In the southern China with large water area, ammonia deposition from volatilization in planting system should be further included. In the process of watershed transportation, the impacts of multiple terrains（watershed and plains）and multiple water bodies should be emphasized. While in the subsurface migration process, biogeochemical and hydrological retention processes should be considered. In view of the above difficulties, the paper finally discusses the possible solution of Chinese non-point source pollution model, which can provide reference for the model construction with simplification and high accuracy. |
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