Impact of cascade reservoir on the sources of organic matter in sediments of Lancang river
Yufei Bao,
Meng Sun,
Yuchun Wang,
Ji Lu,
Yajie Wu,
Hao Chen,
Shanze Li,
Yong Qin,
Zhuowei Wang,
Jie Wen,
Xinghua Wu,
Zhongjun Wang
Affiliations
Yufei Bao
State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Ecological Environment Engineering Research Center of the Yangtze River, China Three Gorges Corporation, Beijing 100038, China
Meng Sun
State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Yuchun Wang
State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Corresponding author
Ji Lu
Technology R&D Center, Huaneng Lancang River Hydropower Inc., Kunming 650000, China; Corresponding author
Yajie Wu
Technology R&D Center, Huaneng Lancang River Hydropower Inc., Kunming 650000, China
Hao Chen
Technology R&D Center, Huaneng Lancang River Hydropower Inc., Kunming 650000, China
Shanze Li
State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Yong Qin
State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Zhuowei Wang
State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Jie Wen
State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Xinghua Wu
Ecological Environment Engineering Research Center of the Yangtze River, China Three Gorges Corporation, Beijing 100038, China
Zhongjun Wang
Technology R&D Center, Huaneng Lancang River Hydropower Inc., Kunming 650000, China
Summary: The construction of dams to intercept natural rivers constitutes the most severe human activity influencing the underlying surface. This study focuses on four cascade reservoirs of the Lancang River and explores their impact on the migration of organic matter in sediments. The research reveals significant spatial variations in total organic carbon (TOC) and total nitrogen concentrations in the sediments of the four reservoirs. The carbon and nitrogen isotopes indicate that terrigenous organic matter is the main source of TOC in the sediments, contributing an average of 66.80%. Endogenous algal-derived organic matter is the second significant source, contributing between 14.30% and 32.91%. The sources contributed from upstream organic matter are the lowest, ranging from 6.36% to 15.33%. Our study demonstrates that the construction of cascade reservoirs may significantly alter the processes of material sources in the river basin ecosystem, particularly in the large reservoir which increased more endogenous algal-derived organic matter.
