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| Technique and evaluation of soil and water conservation monitoring of the poverty alleviation project in the Yellow River region of Ningxia |
| (Ningxia Agricultural Institute of Survey & Design, Hi-Tech Development Zone，750002, Yinchuan, China) |
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Abstract The objective of this study was to evaluate the effect of poverty alleviation project construction in the Yellow River region of Ningxia on environment and the degree of destroying water and soil resources. Four methods were adopted to measure the loss of water and soil, i.e., water erosion runoff field method, erosion gully monitoring method, bayonet check station of the water erosion control section monitoring method and the simple wind erosion area monitoring method. An index system was used to evaluate the implementation effect in the process of engineering construction. The index system is comprised of soil erosion hazard degree index, ecological environment index, measures of soil and water conservation project, vegetation measures and comprehensive measures. Through real-time monitoring, we concluded that: during the eight-year project, the rate of renovation of disturbed land reached 98.2%, the general harnessing degree of water and soil erosion reached 98%, the soil erosion control ratio reached 1.24, vegetation recovery rate of the project achieved 93.7%, vegetation coverage rate achieved 10.7%, intensity of disturbance of soil erosion was up to 9600t/(km2·a), the sediment reduction rate of engineering revetment was 50%, the sediment reduction rate of artificial afforestation was 65.22%, and the sediment reduction rate of planted grass was 71.52%. The methods of soil and water conservation monitoring, the measured data, the applied indexes etc. used in this project, are of important reference value in investment decision, construction implementation and late evaluation for similar construction projects in the future.
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Received: 02 January 2013
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