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| Sampling program of water erosion inventory in the first national water resource survey |
| Li Zhiguang1， Fu Suhua2， Liu Baoyuan2 |
| 1.The Monitoring Center of Soil and Water Conservation, Ministry of water Resources, RPC,100053, Beijing; 2.Beijing Normal University,100875, Beijing: China |
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Abstract The water erosion inventory is an important part of the first national water resource survey in 20102012. Sampling investigation is the main method of the water erosion inventory. Field sampling units were designed according to erosion types and actual situation of each province: Firstly, the whole country was divided into grids and sampling was complemented according to a certain density to obtain the location of the field survey units; secondly, on the basis of the fourth layer grids, the grid with the area of 1km×1km in the plain area or the small watershed with area from 0.2 to 3.0km2 in the mountainous area was selected for observation. After comprehensive analysis of impact factors including rainfall, terrain, landuse and soil conservation practice the soil erosion intensity was computed by Chinese Soil Loss Equation to evaluate the distribution, area and intensity of water erosion. The evaluation results will provide guidance and decision-making for national water and soil conservation and ecological construction. This sampling method research is of great significance for comprehensive investigation and scientific evaluation of water erosion’s present situation, trends of development and forecasting.
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Received: 24 October 2011
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