不同雨强下黄土裸坡水-沙-氮磷流失耦合模拟

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Abstract The simulated rainfall experiment was conducted to explore the effect of rainfall intensity on coupling loss rules of runoff and sediment and nutrients under different loess bare slopes.Results showed that:1) The linear fitting coefficients between rainfall intensity and soil infiltration rate,runoff or sediment were all greater than 0.8,there were strong positive correlations;2) At 25°slope:The initial NO₃^--N concentration was high,it was decreased with increased rainfall duration,the scouring effect was significant;The initial NH₄⁺-N concentration increased from 0.6057 to 1.3076mg/L with increased rainfall intensity from 90 to 120mm/h,but NH₄⁺-N concentration decreased with increased rainfall duration;TN concentrations were 0.6056,0.8011 and 1.3076mg/L under rainfall intensities of 90,105 and 120mm/h,which increased with increased rainfall intensity;The initial TP concentration had the maximum value in 105mm/h and the minimum value in 90mm/h,and TP concentrations in different rainfall intensities were intertwined and unstable.3) There was a strong linear correlation between runoff yield and nutrient loss,while there was a significant power correlation between sediment and nutrient loss.At 15°slope:the loss forms of nitrogen was mainly in particulate state under six rainfall intensities,which approximately accounted for an average of 72%,but the proportion of particulate nitrogen decreased first and then increased with increased rainfall intensity;the contribution of particulate phosphorus accounted for more than 90%,which was no direct relation with rainfall intensity and slope.

Key words： rainfall intensities loess slope bare land runoff and sediment loss of nitrogen and phosphorus

Received: 15 August 2017

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	PENG Meng-ling
	WU Lei
	QIAO Shan-shan

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PENG Meng-ling,WU Lei,QIAO Shan-shan. Coupling simulation of runoff-sediment-nutrient loss on loess bare sloping land under different rainfall intensities[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 1109-1116.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/1109

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