Abstract: A method disclosed includes following steps: gridding on a research area to obtain grid units; performing a numerical processing on fertilization influence features to obtain fertilization influence numerical features of each grid unit; acquiring time information of the fertilization manual in the research area; calculating the fertilization influence numerical features of each grid unit by using weights of the fertilization influence features, acquiring nitrogen fertilizer application amounts of each grid unit in different time periods; performing a data processing on a first geographic information system to obtain a second geographic information system; and using the second geographic information system to estimate a nitrogen fertilizer application amount in the research area. A system disclosed includes a gridding unit, a digitizing unit, an acquisition unit, a calculation unit, a data processing unit and a nitrogen fertilizer estimation unit.

Abstract: Disclosed are a method, a system, a computer equipment and a storage medium for nitrogen pollution hierarchical calculation in a water environment, and the method includes the following steps: carrying out a gridding processing on a watershed to obtain watershed grids; constructing a nitrogen pollution biogeochemical circulation model according to calculation methods and interrelations of carbon and nitrogen variables; establishing the nitrogen pollution biogeochemical circulation model in each of the watershed grids; and calculating a total non-point source nitrogen pollution in the watershed according to the nitrogen pollution biogeochemical circulation model in each of the watershed grids.