Temporal characteristics and impact factors of nitrogen loss in Shanmei Reservoir watershed
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Abstract:
Based on the development o f SWAT model in the Shanmei Reser voir water shed, var iatio n char act eristics of T N load and concentrat ions with the precipit at ion and r uno ff during the pr ocesses o f rainstorm at the o ut let of the w atershed wer e simu2 lated. Furthermore, linear co rr elation analysis w as co nducted to analyze t he r elationship between runo ff and nitro gen lo ss under differ ent pr ecipitatio n intensities. T he results showed that the peak of runoff lagg ed one da y behind the peak o f rainfall. Dur ing the pro cess of rainstorm, nitr og en lo ss var ied consistent ly w ith t he var iatio n process o f precipitat ion and r unoff, and T N load show ed hy steresis propert ies lagg ing behind precipitation peak wit h o ne or two additio nal day s, while TN co ncentrat ion pr ocess show ed the o pposite tr end w ith pr ecipitatio n process. Under differ ent conditio ns of rainfall intensit ies, aver age lo ss rate of nitro2 g en incr eased wit h the increasing o f rainfall intensity, and runoff showed a st atistically sig nificant ( P< 0. 01) positive linear re2 latio nship with TN lo ad. Runoff is the pr imary factor affecting nitro gen lo ss.
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