Abstract：[Background] The proportion of measures to conserve soil and water in Shaanxi province is a necessity while determining the quantity of water-and-soil conservation measures in the whole province defined in Regulations of Conserving Soil and Water in Shaanxi province, which has important guiding meanings to scientifically make allocation plans of comprehensively controlling measures for conserving soil and water in small watersheds and for improving the efficiency of soil and water loss control. To conduct researches about the proportion of water-and-soil conservation measures in Shaanxi province and to determine the types and quantities of water-and-soil conservation measures based on local conditions has important realistic meanings in constructing ecological civilization at local regions and promoting the regional economy.[Methods] With the summary of the already implemented comprehensive controlling projects of conserving soil and water in recent years in Shaanxi province, this study chose typical and representative small watersheds to conduct actual investigation regarding different regions based on the regulations of soil and water conservation in Shaanxi province. According to the coverage, types and quantities of measure of the already existed water-and-soil conservation measures at typical small watersheds, as well as the regulated coverage, types and quantities of measures, we calculated the proportions of water-and-soil conservation measures in all regions after actual verifications.[Results] On the basis of the proportions of measures in all regions and using the controlling coverage and weighted mean, the proportion of the already-taken measures in Shaanxi province is that the major six measures such as the prime farmland (including terrace, dam land and other water-and-soil conservation measures), arbor forest, shrub forest, economic forest, grass-growing and enclosing treatment take 22.3%, 27.7%, 17.2%, 14.0%, 8.3% and 10.5% respectively. Among the already controlled water-and-soil loss area of 1 000 km2, there are 35 large dams, 125 medium-sized dams, 297 small dams, 245 km long cut ditches and 9 209 reservoirs. The proportion of regulated measures is that the major six measures such as the terrace, arbor forest, shrub forest, economic forest, grass-growing, and closed treatment take 5.6%, 12.3%, 11.7%, 6.7%, 4.7% and 59.0% respectively. In every controlled water-and-soil loss area of 1 000 km2, it needs to build 29 large dams, 66 medium-sized dams, 255 small dams, 354 km long cut ditches and 93 ponds. All these need to be allocated to the current 12 cities (or regions) in Shaanxi province.[Conclusions] The index of the proportion of water-and-soil conservation measures in Shaanxi province may provide a basis for the municipal regulating work of water and soil conservation in future and serve as a reference for the management of comprehensive controlling projects of water and soil loss invested by national, the provincial and the city-level governments.
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2018, Vol. 16 
