| 邵薇薇,邵蕊,倪广恒,王义成,杨志勇,刘家宏.北京市主城区高分辨率的城市水碳通量模拟研究[J].水利学报,2024,55(5):516-527 |
| 北京市主城区高分辨率的城市水碳通量模拟研究 |
| High-resolution modeling of urban water and carbon fluxes in the main urban area of Beijing，China |
| 投稿时间：2023-09-19 |
| DOI：10.13243/j.cnki.slxb.20230581 |
| 中文关键词: 城市化 生态系统 蒸散发 北京市 水分利用效率 |
| 英文关键词: urbanization ecosystems evapotranspiration Beijing water use efficiency |
| 基金项目:北京市自然科学基金项目(8222036);国家自然科学基金项目(51979285，U2240223);国家重点实验室自主研究课题(SKL2022TS11);水利部重大科技项目(SKS-2022126);中国水利水电科学研究院基本科研业务费专项(WR110145B0042023) |
|
| 摘要点击次数: 1059 |
| 全文下载次数: 489 |
| 中文摘要: |
| 城市化通过影响地表蒸散发(ET)过程改变了区域水热平衡等水文和生态过程，进而改变了陆地生态系统的结构与功能。为科学评估城市水碳过程，基于哨兵二号卫星数据的植被信息，估算了2016—2021年逐月北京市主城区10 m×10 m空间分辨率的植被指数，进一步结合PT-JPLim四源蒸散发模型、InVEST模型以及解析型生态系统水分利用效率(WUE)模型，模拟了2016—2021年北京市主城区10 m×10 m空间分辨率的蒸散发、蒸散发分量(植被蒸腾Et、土壤蒸发Eb、截留蒸发Ei和不透水面蒸发Eu)、总初级生产力(GPP)、碳储量以及WUE的月值，并分析了其相关关系。植被指数较大值集中在西部山区，其次为北京市的公园区域，归一化植被指数NDVI最大值为0.65。主城区多年平均蒸散发量为497 mm，ET随着叶面积植被指数LAI和增强植被指数EVI的增加而增加。2016—2021年期间，NDVI、LAI和EVI分别以每年0.0048、0.016 m2·m-2和0.0047的速度增加。区域平均Et为141.51 mm，Ei为50.77 mm，Eb为272 mm，不透水面上的Eu/ET为18.2%。碳储量较高的区域主要分布在西部山区，该区域海拔相对较高，植被覆盖率较高，总碳储量密度高值超过5 t/hm2。研究区GPP的平均值为2.7 g·m-2·d-1，多年平均WUE为0.63 g·mm-1。WUE和Et/ET呈显著负相关(R=-0.44，p<0.001)，WUE随GPP的增加呈现显著的上升趋势。精细化的城市水碳模拟能够为海绵城市的建设和评估提供理论基础，对“双碳”目标的实现具有重要意义。 |
| 英文摘要: |
| Urbanization alters hydrological and ecological processes，such as regional water-heat balance，by affecting surface evapotranspiration(ET) processes，which in turn changes the structure and function of terrestrial ecosystems.To scientifically assess the urban water-carbon process，this study estimated the monthly vegetation index at 10 m×10 m spatial resolution in the main urban area of Beijing from 2016 to 2021 based on the vegetation information from Sentinel-2 data，and further combined with the PT-JPLim model，the InVEST(Integrated Valuation of Ecosystem Services and Tradeoffs)，and the analytical WUE(Water Use Efficiency) model to simulate the monthly ET ，ET partitioning(transpiration Et，soil evaporation Eb，interception evaporation Ei，and impervious surface evaporation Eu)，gross primary productivity(GPP)，carbon storage，and ecosystem WUE for the main urban area of Beijing at a spatial resolution of 10 m×10 m.Larger values of vegetation index were concentrated in the western mountainous areas，and the park areas of Beijing also presented larger NDVI(Normalized Differnce Vegetation Index) with a maximum value of 0.65.The annual mean ET in the main urban area of Beijing is 497 mm，with the highest ET in the western mountainous area，exceeding 1000 mm.ET increases with the increase of LAI(Leaf Area Index) and EVI(Enhanced Vegetation Index).Increases in NDVI，LAI，and EVI were observed at a rate of 0.0048，0.016 m2·m-2，and 0.0047 per year，respectively，from 2016 to 2021.The regional average Et was 141.51 mm，Ei was 50.77 mm，and Eb was 272 mm.Eu was distributed only on impervious surfaces of building sites，and Eu/ET on impervious surfaces was 18.2%.The areas with higher carbon storage were mainly distributed in the western mountains，which had relatively high elevation，high vegetation cover，and high values of total carbon storage density exceeding 5 t/hm2.The mean value of GPP in the study area was 2.7 g·m-2·d-1，and the annual mean WUE was 0.63 g·mm-1.There was a significant negative correlation between WUE and Et/ET(R=-0.44，p<0.001)，and WUE tended to increase significantly with increasing GPP.The refined urban water and carbon simulation can provide a theoretical basis for the construction and evaluation of sponge cities，and the simulation of urban water and carbon fluxes is of great significance for the achievement of the carbon peaking and carbon neutrality goals. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |