摘要
多伦县位于浑善达克沙地南缘,是京津冀生态安全的前沿阵地。2000年以来,该县陆续实施了京津风沙源治理工程、百万亩樟子松造林工程等多项生态恢复治理工程。基于2000—2024年美国陆地卫星Landsat TM/OLI遥感影像计算植被覆盖度(FVC),并运用修正风蚀方程(RWEQ)模型计算固沙量,利用Sen趋势分析和Mann-Kendall检验方法分析了植被覆盖和固沙量的时空变化,探究生态恢复治理工程驱动下多伦县防风固沙功能的变化趋势。研究结果表明:(1)2000—2024年,多伦县植被覆盖度显著上升,全县平均植被覆盖度的年际增长率为0.84%/a,生态治理重点区域植被覆盖改善尤为明显。(2)25年间,多伦县防风固沙量呈明显上升趋势,全县固沙总量年际增长率为1.56万t/a。固沙量显著提升的区域面积为2263.98 km^(2),占比达58.64%,主要分布在蔡木山乡西部和多伦诺尔镇南部等生态治理重点区域。(3)植被覆盖度和防风固沙功能的时间变化及空间分布体现了较强的一致性,表明该地区通过大规模实施生态恢复治理工程提高植被覆盖度,有效提升了防风固沙服务功能,成效显著。本研究为多伦县生态恢复治理规划和成效评估提供了科学依据,并为干旱半干旱区风蚀防治和区域可持续发展提供参考。
Duolun County is located on the southern edge of the Hunshandak Sandy Land and serves as a frontier for ecological security in the Beijing-Tianjin-Hebei region.Since 2000,the county has successively implemented several ecological restoration projects,including the Beijing-Tianjin Sandstorm Source Control Project and the Million-Mu(666.67 km^(2))Larix olgensis Afforestation Project.This study calculated fractional vegetation coverage(FVC)based on Landsat TM/OLI remote sensing images from^(2)000 to 2024,and estimated the sand fixation amount using the Revised Wind Erosion Equation(RWEQ)model.The spatiotemporal variations of vegetation coverage and sand fixation amount were analyzed using Sen's trend analysis and Mann-Kendall test methods to explore the trend of windbreak and sand fixation functions in Duolun County driven by ecological restoration projects.The results show that:(1)from^(2)000 to 2024,vegetation coverage in Duolun County significantly increased,with an average annual growth rate of 0.84%/a.The improvement in vegetation coverage was especially noticeable in the key ecological restoration areas.(2)During these 25 years,the sand fixation amount in Duolun County showed a significant upward trend,with an annual growth of 15600 t/a.The area with a significant increase in sand fixation amounted to 2263.98 km^(2),accounting for 58.64%,primarily located in the key ecological restoration areas such as the western part of Caimushan Township and the southern part of Duolunnor Town.(3)The temporal changes and spatial distribution of vegetation coverage were strongly consistent with those of windbreak and sand fixation functions,indicating that the large-scale implementation of ecological restoration projects has significantly improved vegetation coverage and effectively enhanced windbreak and sand fixation.The results of this study provide scientific evidence for ecological restoration planning and effectiveness assessment in Duolun County,and offer valuable insights for wind erosion control and sustainable regional development in arid and semi-arid areas.
作者
李慧融
王甜甜
郑琳
崔鑫
袁雨晨
孙琳丽
LI Huirong;WANG Tiantian;ZHENG Lin;CUI Xin;YUAN Yuchen;SUN Linli(Xilinhot National Climate Observatory,Xilinhot,Inner Mongolia 026000,China;Xilinhot Field Research Station for Grassland Ecological Meteorology,China Meteorological Administration,Xilinhot,Inner Mongolia 026000,China;Jiangsu Province Key Laboratory of Remote Sensing Monitoring for Ecological Environment Protection(Under Preparation),Nanjing,Jiangsu 210019,China;Erenhot Meteorological Bureau,Erenhot,Inner Mongolia 011100,China;Duolun County Meteorological Bureau,Duolun,Inner Mongolia 027300,China;Tongliao Meteorological Bureau,Tongliao,Inner Mongolia 028000,China)
出处
《环境监控与预警》
2025年第4期37-45,共9页
Environmental Monitoring and Forewarning
基金
内蒙古自治区气象局科学试验项目(nmqxkxsy202411,202412)
内蒙古自治区气象局科技创新科目(nmqxkjcx202421)
内蒙古自治区气象局引导性创新基金项目(nmqxydcx202215)。
关键词
遥感
植被覆盖度
修正风蚀模型
生态恢复治理工程
防风固沙
Remote sensing
Vegetation coverage
Revised wind erosion equation(RWEQ)
Ecological restoration projects
Wind prevention and sand fixation
