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| Characteristics of runoff and sediment and N、P loss in Nicotiana tabacum land slope in typical small watershed of Fuxian Lake |
| Bai Wenzhong,Wang Keqin |
| Environmental Engineering Department in Southwest Forestry College,650224,Kunming,China |
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Abstract Based on the continuous observation of the nitrogen and phosphorus loss in surface runoff and sediment in under rainfall events from June to September in 2007 with a standard plot method on a Nicotiana tabacum land slope in the typical small watershed of Fuxian Lake,this article studied the characteristics the loss of nitrogen and phosphorus with runoff and sediment,the results showed that: 1) The runoff amount has strong correlation with the maximum rainfall intensity of 10 minutes(R2=0.878 9),and sediment yield has strong correlation with the maximum rainfall intensity of 30 minutes(R2=0.944 5);2) The loss amount concentration of TN、NH+4-N gradually reduced with fertilizing time;3) TP loss has a significant correlation with the maximum rainfall intensity of 10 minutes(R2=0.897 1);4) TN loss has a significant positive correlation with runoff amount,and TP loss has a very significant correlation with runoff amount and sediment yield,TN loss has a positive correlation with TP loss,the pearson coefficient is 0.542(sig.=0.106).
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Received: 07 November 2008
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