| Cite this article: | 杨海洋,袁 远,王江彦,等.河南淮河流域褐土非点源氮输出的人工降雨模拟研究[J].灌溉排水学报,2022,():-. |
| YANG Hai-yang,YUAN Yuan,WANG Jiang-yan,et al.河南淮河流域褐土非点源氮输出的人工降雨模拟研究[J].灌溉排水学报,2022,():-. |
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| Rainfall simulation of non-point source nitrogen output from typical soils in Huaihe River Watershed, Henan Province |
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YANG Hai-yang, YUAN Yuan, WANG Jiang-yan, SHENG Chong, YANG Guo-xin, WU Ming-zuo
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School of Forestry,Henan Agricultural University,Zhengzhou Henan 450002
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| Abstract: |
| 【Objective】The aim is to identify the effects of rainfall intensity and straw returning on nitrogen loss, to provide a basis in Huaihe River watershed for quantifing and controlling of farmland non-point source output and for regional environment management.【Method】Taking typical soil (cinnamon soil) and its straw mixed soils in Huaihe River watershed of Henan Province as object, rainfall intensity of 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 mm/min were simulated to study the surface runoff, sedment and nitrogen loss.【Result】The larger the rainfall intensity, the larger the cumulative runoff, sediment, nitrogen output and their output rate. The nitrogen concentration in runoff changed much at early stage of the rainfall process, showing an earlier flush effect, and then fluctuated to be relative stable or slightly decline at the end; its average concentration without straw mixed reached highest at 2.0 mm/min and higher at 3.0 mm/min, while highest at 1.5 mm/min when mixed straw. The amount of nitrogen loss through sediment accounts for above 92.8% of total loss, and lower when mixed straw. After straw returning, surface runoff and sediment loss could be reduced under low rainfall intensity, but sediment loss can be increased under high rainfall intensity; the nitrogen concentration is higher than that without mixed straw, which increases the cumulative nitrogen output. There is a good power function relationship between cumulative runoff and sediment and nitrogen output, all the correlation coefficients were above 0.900.【Conclusion】Rainfall intensity, soil type and straw returning had effects on surface runoff, sediment and nitrogen output; there is a rainfall intensity induced an obvious change of nitrogen output, the intensity is 1.0 mm/min without mixed straw and 1.5 mm/min when mixed straw; the important mean for controlling farmland non-point source load include controlling nitrogen loss at earlier rainfall stage and sediment loss, appropriate returning time should be considered when return straw. |
| Key words: farmland non-point source; nitrogen output; artificial rainfall; runoff; sedment loss; straw returning; Huaihe River Watershed; Henan Province |
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