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| Review of research on enrichment ratio of nutrient in soil erosion process |
| Ye Zhihan1,Liu Baoyuan2,Fu Suhua2,Zeng Xianqin2 |
| 1.Beijing Hydraulic Research Institute,100048;2 State Key Laboratory of Earth Surface Processes and Resource Ecology,School of Geography,Beijing Normal University,100875: Beijing,China |
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Abstract Nutrients are usually enriched in sediment comparing with the original soil where they are eroded from.The degree of enrichment,expressed as the enrichment ratio,must be known to estimate and predict nonpoint source pollution.The purpose of this study was to do a systematic review of the research on values and equations of nutrient enrichment ratio.The reviewed literature showed that enrichment ratio of nitrogen varied from 0.99 to 8.17 and the main scope was 1.11 to 2.99.The enrichment ratio of phosphorus varied from 0.84 to 16.12 and the main scope was 1.26 to 7.17.The equations for calculating enrichment ratio could be generally classified to six groups,which are based on the relationships between enrichment ratio（ER） and sediment yield,sediment concentration,soil texture,soil specific surface area,sediment delivery ratio or some combinations of them.In this paper,analysis and comparison were made on different equations.The results presented in this paper may help to choose nutrient enrichment ratio in nonpoint source pollution estimation and further studies.
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Received: 14 November 2007
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