关键词: 水土保持, 土地生态系统, 土壤保持量, 土壤保持价值量, 陕北黄土高原

Abstract: [Objective] Soil erosion is caused by mankind's survival increasingly scarce land resources degradation. To quantitatively calculate the value of the Soil and Fertilization Conservation,the paper provide the scientific decision-making for the sustained use of land for regional socio-economic development and ecological environment. [Method] Supported by “3S” technology , this paper brought for ththe landuse change in Loess Plateau in northern Shaanxi, from 1978 to 2000 , then studied the distribution rules of soil erosion under different landuse pattern quantificationally by Universal Soi Erosion Equation during that period, and emphasized the impact of changes of landuse patternon soil erosion. So, using market price, opportunity cost and alternative project, the value of vegetation’s soil conservation is calculated on its role in conserving soil fertility, reducing land abandon and reducing sediment accumulation.[Results] From the entire time, maintain the soil for the growth of 94.18%, nearly doubled from 1978 to 2000. The value of Soil and Fertilization Conservation in the Loess Plateau in northern Shaanxi province is 18.503 billion in1978;the value in 1990 an increase of nearly 800 million yuan than in 1978;the valure in 1990 is an increase of 241.4 million yuan than that is in 2000. [Conclusion] The value of the Soil and Fertilization Conservation in the loess plateau in northern shaanxi province trend from increasing to decreasing in 1978~2000 years, this feature is basically identical with the natural environment. If three different types of landscape areas, the results are : mountains in southern zone> sandstorm transitional zone in northern >Central loess hills area. But from 1978 to 2000 the average amount of soil map can see that The average amount significantly larger areas southward, it is mainly the weather conditions in recent years has had close relations.

Key words: Soil and Fertilization Conservation, landuse, matter amount, value amount, the loess plateau in northern shaanxi province