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| Study on the Benefits of Level Terrace on Soil and Water Conservation |
| Wu Faqi1,Zhang Yubin2,Wang Jian1 |
| 1 College of Resource and Environment, Northwest Sci-Tech University of Agriculture & Forestry; 2 Institute of Soil and Water Conservation, CAS & MWR, State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau: 712100, Yangling, Shaanxi, China |
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Abstract By collecting and analyzing the survey data of runoff and sediment plots in soil and water conservation stations (Xifeng et al.) on Loess Plateau, the benefits of level terrace on soil and water conservation was studied by the method of contributing factor for soil and water conservation. It showed that the average value of benefits result is 86 7% and 87 7%,yet the difference is large because of the effect of the rain-storm, torrential rain and its quality. The benefits were 100% when rainfall synthesis parameter PI was less than 20 0mm2/min, rainfall in flood period was less than 350?mm and annual rainfall of runoff gentration was less than 125?mm. The relationship between benefit and parameters is negative correlation. Also terrace quality effects the benefits.
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Received: 24 September 2003
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