Characteristics of Nitrogen Output from Agricultural Non-point Source in Typical Watershed of Three Gorges Reservoir Area

doi:10.14088/j.cnki.issn0439-8114.2018.10.008

Abstract

Abstract: Taking the typical watershed in the Three Gorges Reservoir Area as the research unit,and the continuous sampling observation on the monitoring points of the watershed outlet set under the natural rainfall conditions were conducted. The results showed that in 2015,the Changping watershed rainfall in April-September reached 703.1 mm and the runoff amounting to 686 354.4 m³,accounting for 83.0% and 78.8% of the annual total respectively; And the runoff and rainfall were significantly correlated（r=0.056,P<; 0.01）; During this period,the total nitrogen output load accounted for 88.7% of the whole year,which was the main period of nitrogen loss in the watershed, and the runoff was the main channel and driving force of the surface nitrogen export; The average annual total nitrogen concentration was 2.0 mg/L,the peak concentration mainly in July to September; The annual output loads of total nitrogen（TN）,nitrate nitrogen（NO₃^--N）,ammonia nitrogen（NH₄⁺-N） and particulate nitrogen（PN） were 9.0,6.6,0.4 and 1.9 kg/hm²,respectively. The main forms of nitrogen loss were nitrate nitrogen,accounting for 73.7% of the total nitrogen output load.

Key words: Three Gorges Reservoir Area, non-point source pollution, rainfall runoff, nitrogen loss

CLC Number:

X832

LIU Fang-yi, FAN Xian-peng, XIA Ying, HUANG Min, ZHANG Fu-lin, WU Mao-qian. Characteristics of Nitrogen Output from Agricultural Non-point Source in Typical Watershed of Three Gorges Reservoir Area[J]. HUBEI AGRICULTURAL SCIENCES, 2018, 57(10): 31-35.

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