Impacts of Dam Operation on Vegetation Dynamics of Mid-Channel Bars in the Mid-Lower Yangtze River, China
文献类型：期刊论文
| 作者 | Zhou, Xu1,3,4; Wen, Zhaofei3,4 ; Huang, Yuanyang2; Yi, Xuemei3,4; Ma, Maohua3,4; Liao, Tao1,3,4; Wu, Shengjun3,4
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| 刊名 | REMOTE SENSING
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| 出版日期 | 2021-10-01 |
| 卷号 | 13期号:20页码:14 |
| 关键词 | Three Gorges Dam flood disturbances remote sensing monitoring vegetation colonization sandbars |
| DOI | 10.3390/rs13204190 |
| 通讯作者 | Wen, Zhaofei(wenzhaofei@cigit.ac.cn) |
| 英文摘要 | Vegetation dynamics on mid-channel bars (MCBs) is essential for supporting ecosystem functions and associated services in river systems, especially in dammed large rivers. Generally, there are two possible changing patterns that vegetation of MCBs downstream a dam would experience. On one hand, the vegetation area may shrink because of a decrease in the MCB area in the post-dam period, which has been observed in many rivers around the world. On the other hand, the MCB vegetation area may expand because flood disturbances would be weakened by dam operation. However, little evidence has been reported to clarify such confusion. Therefore, vegetation dynamics of MCBs in the mid-lower Yangtze River downstream the Three Gorges Dam (TGD; the world's largest dam) is selected as a case study to address the issue. Using long-term (1987-2017) Landsat archive images, this study reveals the spatiotemporal variations of vegetation area change intensities (VACIs; indicated by dynamic trends) on MCBs in the mid-lower Yangtze River. Results show that an overall VACI in the post-dam period (2003-2017) is about three times faster than that in the pre-dam period (1987-2002). In other words, the rate of vegetation colonization accelerated after the TGD operation began in 2003. Moreover, the VACIs in the post-dam period are size dependent, where large size MCBs are likely to gain higher VACIs: Small-sized MCBs (0.33 km(2)/yr), medium-sized MCBs (1.23 km(2)/yr), large-sized MCBs (1.49 km(2)/yr). In addition, VACIs of individual MCBs in the post-dam period are distance dependent, where the further a MCB was from the TGD, the higher the VACI. It is also suggested that the weakened flood disturbances in the post-dam could explain the rapid vegetation growth and colonization. This work is not only beneficial for managing and protecting MCBs downstream the TGD after its operation, but is also helpful in understanding vegetation dynamics of MCBs in other dammed river systems around the world. |
| 资助项目 | National Natural Science Foundation of China[51779241] ; National Natural Science Foundation of China[41501096] ; Chongqing Water Resources Bureau[5000002021BF40001] |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology |
| 语种 | 英语 |
| WOS记录号 | WOS:000714050700001 |
| 出版者 | MDPI |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/14439]  |
| 专题 | 中国科学院重庆绿色智能技术研究院 |
| 通讯作者 | Wen, Zhaofei |
| 作者单位 | 1.Chongqing Jiaotong Univ, Coll Architecture & Urban Planning, Chongqing 400074, Peoples R China 2.Minist Nat Resources, Chongqing Inst Geol & Mineral Resources, Observat & Res Stn Ecol Restorat Chongqing Typ Mi, Chongqing 401120, Peoples R China 3.Univ Chinese Acad Sci, Chongqing Sch, Chongqing 400714, Peoples R China 4.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Xu,Wen, Zhaofei,Huang, Yuanyang,et al. Impacts of Dam Operation on Vegetation Dynamics of Mid-Channel Bars in the Mid-Lower Yangtze River, China[J]. REMOTE SENSING,2021,13(20):14. |
| APA | Zhou, Xu.,Wen, Zhaofei.,Huang, Yuanyang.,Yi, Xuemei.,Ma, Maohua.,...&Wu, Shengjun.(2021).Impacts of Dam Operation on Vegetation Dynamics of Mid-Channel Bars in the Mid-Lower Yangtze River, China.REMOTE SENSING,13(20),14. |
| MLA | Zhou, Xu,et al."Impacts of Dam Operation on Vegetation Dynamics of Mid-Channel Bars in the Mid-Lower Yangtze River, China".REMOTE SENSING 13.20(2021):14. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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