Analysis of the nutrient supply of tributaries in the Three Gorges Reservoir during impounding period
SU Qing-qing1,2, LIU De-fu3, LIU Lü-bo4, JI Dao-bin1,2, CUI Yu-jie1,2, SONG Lin-xu1,2, LI Xin1,2, CHEN Xiu-xiu5
1. College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China;
2. Engineering Research Center of Ecoenvironment in Three Gorges Reservoir Region, Ministry of Education, Three Gorges University, Yichang 443002, China;
3. River-Lake Ecological Restoration and Algae Use Hubei Key Laboratory, Hubei University of Technology, Wuhan 430068, China;
4. Department of Civil and Geomatics Engineering, California State University Fresno, Fresno, California 93740, USA;
5. Water Authority of Xuanzhou District, Xuancheng 242000, China
Hydrogen-oxygen isotope and nutrients including nitrogen and phosphorus in the sediments and overlying water were monitored in the bay of the XiangXi River (XXB), the first tributary of the Three Gorges Reservoir(TGR), during the impoundment period. The measured data were used to analyze the distribution characteristics of hydrogen-oxygen isotopes and the nutrients during the impoundment period. A binary mixed linear model was utilized to determine the contribution ratio of the main stream of the Yangtze River (CJ River) to GuFuYuanTou (GFYT), the upstream of the river. The study results showed that the sediments simutaneously functioned as source releasing NH4+-N (ammonia nitrogen), DTP (total dissolved phosphorus), and PO43--P (phosphates), and as absorbent collecting NO3--N (nitrate nitrogen) during the entire impoundment period. The computed results of the contribution ratios indicated that most nitrogen in the sediment (especially for DTN (total dissolved nitrogen) and NO3--N) came from the main stream before the impoundment. After the impoundment, the contribution rate of GFYT increased significantly, with sampling points No. 3 and 4 as the most obvious. Among all the nutrients, most DTP were from GFYT before and after the impoundment and the main stream was the main source of PO43--P before the impoundment. Therefore, while the water in the bay of the reservoir was largely dominated by the influx of the main stream during the impoundment period, the impact of GFYT is more significant than that of the main stream on the sediment-overlying water system.
苏青青, 刘德富, 刘绿波, 纪道斌, 崔玉洁, 宋林旭, 李欣, 陈秀秀. 三峡水库蓄水期支流水体营养盐来源估算[J]. 中国环境科学, 2018, 38(10): 3925-3932.
SU Qing-qing, LIU De-fu, LIU Lü-bo, JI Dao-bin, CUI Yu-jie, SONG Lin-xu, LI Xin, CHEN Xiu-xiu. Analysis of the nutrient supply of tributaries in the Three Gorges Reservoir during impounding period. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(10): 3925-3932.
White J W C, Cook E R, Lawrence J R, et al. The DH ratios of sap in trees:Implications for water sources and tree ring DH ratios[J]. Geochimica Et Cosmochimica Acta, 1985,49(1):237-246.
Wang P, Song X F, Han D M, et al. A study of root water uptake of crops indicated by hydrogen and oxygen stable isotopes:a case in Shanxi Province, China.[J]. Agricultural Water Management, 2010, 97(3):475-482.
Yang Z J, Liu D F, Ji D B, et al. Influence of the impounding process of the Three Gorges Reservoir up to water level 172.5m on water eutrophication in the Xiangxi Bay[J]. Chinese science:technical science, 2010,53(4):1114-1125.
Yang Z J, Liu D F, Ji D B, et al. Influence of the impounding process of the Three Gorges Reservoir up to water level 172.5m on water eutrophication in the Xiangxi Bay[J]. Science China Technological Sciences, 2010,53(4):1114-1125.