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李孝永,匡文慧.北京城市土地利用覆盖变化及其对雨洪调节服务的影响研究.生态学报,2020,(16).http://dx.doi.org/10.5846/stxb201912182736  
北京城市土地利用覆盖变化及其对雨洪调节服务的影响研究
Urban land use/cover change and its effects on urban flood regulation ecosystem services in Beijing
投稿时间:2019-12-18  修订日期:2020-05-29
DOI: " target="_blank" title="转向doi官网查询:http://dx.doi.org">10.5846/stxb201912182736
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基金项目北京市自然科学基金重点项目(8171004)
作者单位E-mail
  xyli2019_st@rcees.ac.cn 
  kuangwh@igsnrr.ac.cn 
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摘要:
城市土地利用/覆盖变化对生态系统雨洪调节服务影响的深入认识对于提升城市生态系统服务以及改善城市环境具有重要意义。本研究以北京市为例,选取1991、2000、2009和2014年四期Landsat遥感影像,利用混合像元分解与人工目视解译集成的方法提取土地利用/覆盖数据,应用SCS-CN模型评估1a、10a、25a 和100a一遇降雨情景下的城市雨洪调节服务,并进一步分析城市建成区土地利用/覆盖变化特征及其对雨洪调节服务的影响。结果表明:1991-2014年,北京城市用地面积增长了1096.53 km2,建成区内不透水面比例上升了9.83%,绿地空间比例下降了9.90%。2000-2009年城市土地利用/覆盖变化最为剧烈,城市用地及不透水面的年均增长速度分别达到45.97 km2/yr和34.26 km2/yr。过去23年间,城市建成区的雨洪调节服务总体呈下降趋势,1a-100a一遇降雨情景下地表径流调节率下降了16.37-21.17%,新扩张区的下降幅度更加明显(19.41-24.06%),一定程度加剧了城市雨洪产流风险。同时,城市新扩张区土地利用/覆盖变化对建成区雨洪调节服务的影响较老城区更强,其影响程度超过84%。本研究能够为城市地表覆盖结构优化、新区绿色基础设施建设及城市雨洪调节服务提升提供依据。
Abstract:
Understanding the effects of urban land use/cover change on urban flood regulation ecosystem services (UFRES) is important for improving urban ecosystem services and urban environment. In this study, taking Beijing as the study area, Landsat images and hybrid classification approach including linear spectral unmixing and artificial visual interpretation were used to extract the urban land use/cover component of Beijing from 1991 to 2014. Then, the SCS-CN model was applied to access the UFRES under 1a, 10a, 25a and 100a rainfall returning periods in built-up areas. Further, we analyzed the impact of land use/cover change on UFRES. The results showed that: the area of built-up land and impervious surface in Beijing increased by 1096.53 km2 and 733.74 km2 from 1991 to 2014, respectively. Meanwhile, urban impervious surface (IS) proportion increased by 9.83%, while urban green space (GS) proportion decreased by 9.90%. Urban land use/cover changed dramatically in 2000-2009, with an annual growth rate of built-up land and impervious surface by 45.97 km2/yr and 34.26 km2/yr, respectively. In the past 23 years, UFRES showed a decreased trend with a decrease of runoff reduction efficiency by 16.37-21.17% from 1a to 100a rainfall returning periods, and the old urban area showed a higher decreasing trend (19.41-24.06%), which aggravated urban flood risk. Comparing with the old urban area, the land cover change in the new expansion urban area had a more significant impact on UFRES, with a contribution of more than 84%. This study can provide a scientific reference for urban land cover optimization and the green infrastructure planning of the new developed region to improve urban flood regulation ecosystem services.

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