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| Simulation study on the effects of typical gully land consolidation on runoff-sediment-nitrogen emissions in the loess hilly-gully region |
| Received:January 09, 2017 |
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| KeyWord:loess hilly-gully region;gully land consolidation;precipitation transformation;runoff and sediment;nitrogen |
| Author Name | Affiliation | E-mail | | SUN Peng-cheng | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | GAO Jian-en | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China | gaojianen@126.com | | HAN Sai-qi | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | YIN Yan | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | ZHOU Mei-fang | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China | | | HAN Jian-qiao | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| It is necessary but difficult to evaluate the influence of gully land consolidation on water resources and water quality in the loess hilly-gully region. Through the rainfall simulation experiments in different rainfall intensities and channel land consolidation ratios, this study evaluated impacts of gully land consolidation project on surface and underground runoff, analyzed responses of gully land consolidation project on nitrogen emissions and also discussed the mechanism of gully land consolidation on precipitation distribution and nitrogen emissions. Results indicated that the gully land consolidation project could regulate the distribution of precipitation, intercept rainfall runoff and promote the transformation of underground runoff. The regulation level increased with the increase of gully land consolidation ratio,and the average proportions of surface runoff, soil retention and underground residence from precipitation of different rainfall intensities can be adjusted from 62:21:17 to 45:22:33 and 27:23:50 when the gully land consolidation ratios were designed as 30% and 60% respectively. The gully land consolidation project reduced the discharge of sediment, nitrate nitrogen and ammonium nitrogen in surface runoff but with an increased risk of nitrate nitrogen output in groundwater runoff.The gully land consolidation with a proportion of 60% could reduce 69%~82% of sediment output, 63%~74% of ammonium nitrate output, and 31%~48% of nitrate nitrogen output in surface runoff, but increased 160%~337% of nitrate nitrogen output and had no effect on the ammonium nitrogen output in groundwater runoff. |
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