• 大江大河会议专刊:北运河流域植被覆盖度变化及其生态环境质量评估
  • Change of vegetation coverage and assessment of ecological environment quality in Beiyun River Basin
  • 基金项目:内陆浅水湖库变化水环境下沉水植物种群的遥感精细识别与时空监测,国家自然科学基金面上项目
  • 作者
  • 单位
  • 苏朔
  • 首都师范大学
  • 宫兆宁
  • 首都师范大学
  • 张文静
  • 首都师范大学
  • 王一飞
  • 首都师范大学
  • 张园
  • 首都师范大学
  • 摘要:北运河流域作为北京城市副中心建设涉及的重要自然地理单元,流域内人类活动剧烈,生态问题突出,生态环境质量的优劣是影响生态宜居示范区建设的关键。本文选取1990年、2004年、2018年时相相近的三期Landsat TM/OLI数据,首先采用线性光谱混合模型进行植被覆盖度(FVC)的计算,再利用主成分分析法构建遥感生态指数(RSEI),并对二者时空变化规律及相关性进行探究。结果表明:1990-2018年期间,研究区平均植被覆盖度与遥感生态指数均呈现先增后减的趋势,植被覆盖度由0.36增长至0.43再降至0.41,遥感生态指数由0.545增加为0.584后又降至0.545。1990-2004年生态质量下降的区域集中分布在北京市主城区四周,环境质量改善的区域集中分布在北运河流域北部、中心城区以及东南部,而2004-2018年生态质量下降的重点区域则向东南部流域下游转移,环境质量改善的区域则大面积减少。流域内生态质量保持稳定的区域大幅增加,生态质量差与较差区域占比连续降低,表明研究区大部分区域生态系统状况趋于稳定状态,对城市中极端生态环境问题的治理初见成效。回归分析获得的植被覆盖度与遥感生态指数相关系数表明,生态环境质量的提升与植被覆盖的增加有较强相关性。
  • Abstract:Beiyun River Basin, as an important natural geographical unit involved in the construction of Beijing's urban sub center, is characterized by intense human activities, prominent ecological problems, and the quality of ecological environment, which is the key to the construction of ecological livable demonstration area. In this paper, three similar periods of Landsat TM/OLI data in 1990, 2004 and 2018 are selected. Firstly, the linear spectral mixed model is used to calculate the vegetation coverage (FVC), and then the principal component analysis method is used to build the remote sensing ecological index (RSEI), and the temporal and spatial change law and correlation between the two are explored. The results show that during 1990-2018, the average vegetation coverage and remote sensing ecological index of the study area showed a trend of increasing first and then decreasing, the vegetation coverage increased from 0.36 to 0.43 and then decreased to 0.41, and the remote sensing ecological index increased from 0.545 to 0.584 and then decreased to 0.545. From 1990 to 2004, the areas with decreased ecological quality were concentrated around the main urban area of Beijing, the areas with improved environmental quality were concentrated in the north, central urban area and southeast of the Beiyun River Basin, while the key areas with decreased ecological quality in 2004-2018 were shifted to the downstream of the southeast River Basin, and the areas with improved environmental quality were greatly reduced. The number of regions with stable ecological quality has increased significantly, and the proportion of regions with poor and poor ecological quality has decreased continuously, indicating that most of the regions in the study area are in a stable state, and the governance of extreme ecological environment problems in cities has achieved initial results. The correlation coefficient between vegetation coverage and remote sensing ecological index obtained by regression analysis shows that the improvement of ecological environment quality has a strong correlation with the increase of vegetation coverage.

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