基于Landsat影像的雄安新区2013—2021年土地利用变化检测和生态政策评估

Detection of changes in land use and evaluation of ecological quality in the Xiong’an New Area from 2013 to 2021 from Landsat images

  • 摘要: 利用2013—2021年共9期Landsat8影像,采用面向对象的监督分类方法,得到新区逐年土地利用与覆盖分类结果,进行LUCC分析及生态品质评价.结论:1)分类结果总体精度>86.8%,K为 0.81~0.88,优于同期FROM-GLC及GLC_FCS全球分类产品;2)雄安新区设立至今耕地面积减少,不透水面和林地面积增长,蓝绿空间面积占比由12%增加至30%,雄安3县(雄县、容城县和安新县)建设严格遵循了新区《规划纲要》中植树造林、城市发展、湿地涵养3项不同的建设任务,各县主要土地利用覆盖变化分别为耕地向林地的转变、耕地与不透水面的相互转变以及耕地向水体和水生植被的转变;3)不透水面扩张与城市建设对生态品质的负面影响正逐步被森林覆盖率、蓝绿空间面积增加带来的正面影响所抵消.总体看,雄安新区土地利用/覆盖变化遵循新区规划要求,体现了经济社会发展和生态建设的成果.

     

    Abstract: Nine Landsat8 images from 2013 to 2021 were used to obtain year-by-year land use and land cover classification results in Xiong’an New Area, with object-oriented supervision classification method and LUCC analysis to carry out ecological quality evaluation. Overall accuracy of the classification results was greater than 86.8%, the Kappa coefficients ranged from 0.81 to 0.88, superior to FROM-GLC and GLC_FCS global land cover product. Since the establishment of Xiong’an New Area, total area of cropland has decreased, impervious area and forest increased, but proportion of blue-green space has increased from 12% to 30%. Different LUCC patterns were observed in three counties in Xiong’an New Area, meeting the planning requirements very well. Construction of the three counties in Xiong’an New Area has been in strict incompliance with the construction tasks of afforestation, urban development, wetland conservation in the Outline Plan of the New Area. Main land use coverage changes in each county are: a shift from cropland to forested land, mutual shift between cropland and impervious surface, and shift from cropland to water bodies and aquatic vegetation. Negative impacts of impervious surface expansion and urban construction on ecological quality are gradually being offset by positive impacts of increased forest cover and blue-green space. In conclusion, LUCC in Xiong’an New Area complies with construction policy, reflects achievements of economic and social development in the area.

     

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