Abstract:

The revised wind erosion equation (RWEQ) is used to calculate the spatial and temporal changes of the wind erosion in Horqin Left Back Banner from 2010 to 2016, to evaluate the implementation effect of “Double Ten Million Mu” comprehensive management project in Horqin sandy land carried out by Tongliao Government. The results show that the wind erosion decreases significantly in Horqin Left Back Banner from 2010 to 2016, and the total wind erosion decreases from 38.93 million tons in 2010 to 18.83 million tons in 2016, down by 51.63%. The average wind erosion in the project implementation area is higher than the average wind erosion in Horqin Left Back Banner, which shows that the project construction achieves remarkable achievements and reduces the erosion effectively in the project area with high wind erosion. Project area construction has certain extraterritorial effect, and the positive effect of the project construction works not only within the project area, but also in the surrounding areas. The effective range is about 3 km far from the project area. After two years of project implementation, the relative wind erosion coefficient of different distance buffers decreases, and the closer to the project area the buffer is, the more positive effects it behaves.

Key words: wind erosion, RWEQ, “Double Ten Million Mu&rdquo, comprehensive management project, Horqin Left Back Banner

摘要：

以通辽市科尔沁左翼后旗(科左后旗)为研究区, 通过修正的风蚀方程(revised wind erosion equation, RWEQ)计算科左后旗2010—2016年的风蚀强度时空变化, 评价通辽市开展科尔沁沙地“双千万亩”综合治理工程的风沙治理效果。研究结果表明: 1) 2010— 2016年, 科左后旗风蚀强度呈现明显下降的趋势, 总风蚀量从2010年的3893.87万t下降到2016年的1883.56万t, 降幅为51.63%; 2) 工程实施区内平均风蚀强度高于全旗平均风蚀强度, 且相对风蚀系数在2016年明显下降, 说明项目建设成效显著, 有效地削弱了风蚀较高的项目区内的侵蚀; 3) 项目区建设具有一定的域外效应, 范围在3 km左右, 项目实施后, 不同距离缓冲区的相对风蚀系数均明显下降, 且越靠近项目区下降越明显, 从而减小了缓冲区之间的差距。

关键词: 风蚀, 修正的风蚀方程(RWEQ), “双千万亩”综合治理工程, 科尔沁左翼后旗