Method for predicting agricultural non-point source pollution county-scale surface runoff total nitrogen emissions

Abstract

The invention provides a method for predicting agricultural non-point source pollution county-scale surface runoff total nitrogen emissions. The method comprises the steps of 1) obtaining county-level administrative division ranges in different zones through the agricultural non-point source pollution occurring zoning, and as for county-level biological chemical detection of a zone, obtaining N-year county-level surface runoff total nitrogen emissions; 2) selecting N-x-year nitrogen emission data affecting the surface runoff total nitrogen emissions, and establishing an N-year surface runoff total nitrogen county-level prediction model; 3) applying the surface runoff total nitrogen county-level prediction model, and through N-year data affecting the surface runoff total nitrogen emissions, obtaining the N+x-year surface runoff total nitrogen emissions. Aimed at the difficult problem that the county-scale agricultural non-point source pollution surface runoff total nitrogen cannot be predicted and based on the agricultural non-point source pollution occurring zoning, the invention establishes the surface runoff total nitrogen emission prediction model, predicts the agricultural surface runoff total nitrogen emissions, and provides technical support for agricultural non-point source pollution prevention and control.

Description

technical field [0001] The invention belongs to the field of measurement, and in particular relates to a method for predicting total nitrogen discharge. Background technique [0002] With the rapid development of my country's agriculture and rural economy, the problem of agricultural non-point source pollution has become increasingly prominent, especially in intensive agricultural areas. An important reason for the reduction of farmland productivity. According to the results of the first national survey of pollution sources carried out in 2007, the annual emissions of nitrogen and phosphorus from agricultural sources have reached 2.7046 million tons and 284,700 tons, accounting for 57.2% and 67.4% of the country's total nitrogen and phosphorus emissions, respectively. [0003] At present, the research methods used to predict the discharge of nitrogen and phosphorus from non-point source pollution in farmland mainly include the physical model method of non-point source pollut...

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Problems solved by technology

At present, there is no prediction model for farmland non-point source pollution at the county scale in my country.

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