HEI Zhe,WANG Fei,HAN Jianqiao,et al.Change in Vegetation Cover and Soil Erosion in Baiyushan Hilly Area Since the Grain for Green Project[J].Research of Soil and Water Conservation,2020,27(04):39-46.
退耕还林(草)以来陕北白于山区植被覆盖与土壤侵蚀强度变化
- Title:
- Change in Vegetation Cover and Soil Erosion in Baiyushan Hilly Area Since the Grain for Green Project
- 文章编号:
- 1005-3409(2020)04-0039-08
- Keywords:
- vegetation cover change; NDVI; soil erosion risk; Baiyushan Mountain area; Grain-for-Green Project
- 分类号:
- Q948.1; S157
- 文献标志码:
- A
- 摘要:
- 为了研究白于山区土壤侵蚀特征,基于MODIS-NDVI和Landsat影像、DEM和土地利用数据,分析了白于山区2000—2018年植被盖度时空变化规律,并结合坡度和土地利用资料评估了退耕还林(草)工程以来的土壤侵蚀强度变化状况。结果表明:(1)白于山区植被覆盖呈显著增加趋势,年均NDVI增幅为0.065/10 a(p<0.01);(2)白于山区NDVI具有明显的空间分异性,高植被覆盖区主要集中在吴起县,低植被覆盖区主要集中在定边县西部和靖边县中部; 受到地形因子的影响,NDVI分别在海拔1 250～1 400 m,坡度50°～56°范围内达到最大值,且阴坡植被覆盖大于阳坡;(3)白于山区植被盖度整体呈显著增加趋势,植被退化面积与恢复面积分别占研究区面积的3.18%,64.20%;(4)白于山区轻度侵蚀和中度侵蚀的面积减少,但强烈侵蚀、极强烈侵蚀和剧烈侵蚀的面积增加;(5)土壤侵蚀强度减弱的面积占总面积的51.30%,主要集中在吴起县,农耕地面积的减少是土壤侵蚀改善的主要原因。
- Abstract:
- In order to explore the characteristics of soil erosion in Baiyushan Mountain area, based on the datasets of MODIS-NDVI(Normalized Difference Vegetation Index), Landsat, DEM and land use data, we analyzed the regional vegetation cover change in Baiyushan Mountain area from the initiation of the Grain-for-Green Project of China in 2000 till 2018, and assessed the soil erosion intensity with information of slope and vegetation coverage. The results are shown as follows.(1)The annual average NDVI of the Baiyushan Mountain area had increased signicificantly(p<0.01)with a rate of 0.065/decade over the study period.(2)The regional distribution of NDVI varied obviously spatially, and the vegetation cover in Wuqi was high but that in the western of Dingbian and the central of Jingbian were quite poor; the vegetation cover in the study area reached a relative high level at the altitude ranges of 1 250～1 400 m and the slope ranges of 50°～56°,and the vegetation cover on shady slopes was much greater than that on the slopes to southern part.(3)The areas with vegetation degradation and the vegetation recovering accounted for 3.18% and 64.20% of the total area, respectively, and the vegetation cover increased obviously during the whole period.(4)The areas suffering mild erosion and moderate erosion reduced, but the areas with intensive erosion, strong erosion and severe erosion increased.(5)The area with soil erosion decline accounted for 51.3% of the total area, mainly occurred in Wuqi County, and the main reason for erosion decline is the reduction of agricultural land area on the slopes.
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备注/Memo
收稿日期:2019-07-24 修回日期:2019-09-21
资助项目:国家重点研发计划专题计划(2016YFC0501707); 国家自然科学基金(41807067,41771558); 陕西省水利水保科技项目(2017sbkj-01)
第一作者:黑哲(1995—),女,陕西榆林人,硕士研究生,研究方向为水土保持监测评价。E-mail:heizhe17@mails.ucas.ac.cn
通信作者:王飞(1971—),男,陕西户县人,研究员,主要从事水土保持环境效应评价与流域管理研究。E-mail:wafe@ms.iswc.ac.cn