近10年来北方干旱区水土流失演变趋势分析

Analysis on evolution trend of soil erosion in arid regions of North China in recent 10 years

以青海、甘肃、宁夏、内蒙古、陕西和山西6个省区为研究区域,在分析区域近10年水土流失和水土流失治理面积的基础上,首次建立了水土流失面积计算模型,并研究计算出近10年来研究区域水土流失面积变化。研究表明,截至2008年末,研究区域水土流失面积为5 056.63万hm2,与1999年相比,绝对值减少489.29万hm2,相对值减少8.82%。

Taking 6 provinces i.e.Qinghai,Gansu,Ningxia,Inner Mongolia,Shaanxi and Shanxi in China as the case study regions,the model for calculating the soil erosion areas is established at the first time and then the evolutions of the soil erosion areas in the case study regions in the recent 10 years are also studied and analyzed based on the analyses made on both the soil erosion areas and the soil erosion controlled areas therein concerned.The study shows that by the end of 2008,the total soil erosion area in the case study areas was 5 056.63×104 hm2;compared with that of 1999,the absolute and relative values were reduced by 489.29×104 hm2 and 8.82% respectively.