학술논문
Increasing cascade dams in the upstream area reduce nutrient inputs to the Three Gorges Reservoir in China.
Document Type
Academic Journal
Author
Sun Y; Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, Southwest University, College of Resources and Environment, Tiansheng Road 02, Chongqing 400715, China.; Wang M; Earth Systems and Global Change, Wageningen University & Research, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands.; Yang J; Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong Road, Shijiazhuang 050021, China.; Song C; Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.; Chen X; Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, Southwest University, College of Resources and Environment, Tiansheng Road 02, Chongqing 400715, China. Electronic address: chenxj0517@swu.edu.cn.; Chen X; Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, Southwest University, College of Resources and Environment, Tiansheng Road 02, Chongqing 400715, China.; Strokal M; Earth Systems and Global Change, Wageningen University & Research, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands.
Source
Publisher: Elsevier Country of Publication: Netherlands NLM ID: 0330500 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-1026 (Electronic) Linking ISSN: 00489697 NLM ISO Abbreviation: Sci Total Environ Subsets: PubMed not MEDLINE; MEDLINE
Subject
Language
English
Abstract
The upstream cascade dams play an essential role in the nutrient cycle in the Yangtze. However, there is little quantitative information on the effects of upstream damming on nutrient retention in the Three Gorges Reservoir (TGR) in China. Here, we aim to assess the impact of increasing cascade dams in the upstream area of the Yangtze on Dissolved Inorganic Nitrogen and Phosphorus (DIN and DIP) inputs to the TGR and their retention in the TGR and to draw lessons for other large reservoirs. We implemented the Model to Assess River Inputs of Nutrients to seAs (MARINA-Nutrients China-2.0 model). We ran the model with the baseline scenario in which river damming was at the level of 2009 (low) and alternative scenarios with increased damming. Our scenarios differed in nutrient management. Our results indicated that total water storage capacity increased by 98 % in the Yangtze upstream from 2009 to 2022, with 17 new large river dams (>0.5 km 3 ) constructed upstream of the Yangtze. As a result of these new dams, the total DIN inputs to the TGR decreased by 15 % (from 768 Gg year -1 to 651 Gg year -1 ) and DIP inputs decreased by 25 % (from 70 Gg year -1 to 53 Gg year -1 ). Meanwhile, the molar DIN:DIP ratio in inputs to the TGR increased by 13 % between 2009 and 2022. In the future, DIN and DIP inputs to the TGR are projected to decrease further, while the molar DIN:DIP ratio will increase. The Upper Stem contributed 39 %-50 % of DIN inputs and 63 %-84 % of DIP inputs to the TGR in the past and future. Our results deepen our knowledge of nutrient loadings in mainstream dams caused by increasing cascade dams. More research is needed to understand better the impact of increased nutrient ratios due to dam construction.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)