Study on non-point source pollution from corn field under different rainfall levels
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Abstract:
In order to study non-point source pollution from corn field under different rainfall levels, a series field experiments were carried out in a corn field plot in the Liao River region, and the loss rules of non-point source pollution from the corn field land under different rainfall levels between wet year of 2013 and normal year of 2014 were analyzed. Results showed that moderate rain events were difficult to form non-point source pollution in the experiment plot with a slope of 0.5‰ when the antecedent rainfall amount was less, but it would form non-point source pollution when the antecedent rainfall was large. The export coefficients of TN, TP and CODCr are 5.46 kg/hm2, 0.57 kg/hm2, 25.79 kg/hm2 in 2013, and in 2014 are 3.14 kg/hm2, 0.27 kg/hm2and 19.62 kg/hm2 respectively, which are higher than those of 2013.
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