Impacts of Natural and Human-Induced Hydrological Variability on Particulate Organic Carbon Dynamics in the Yellow River

被引:47
作者
Yu, Meng [1 ,2 ,3 ]
Eglinton, Timothy I. [3 ]
Haghipour, Negar [3 ]
Montlucon, Daniel B. [3 ]
Wacker, Lukas [4 ]
Hou, Pengfei [1 ]
Zhang, Hailong [1 ]
Zhao, Meixun [1 ,2 ]
机构
[1] Ocean Univ China, Inst Adv Ocean Studies, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China
[2] Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China
[3] Swiss Fed Inst Technol, Dept Earth Sci, Geol Inst, CH-8092 Zurich, Switzerland
[4] Swiss Fed Inst Technol, Dept Phys, Lab Ion Beam Phys, CH-8093 Zurich, Switzerland
基金
瑞士国家科学基金会; 中国国家自然科学基金;
关键词
WATER-SEDIMENT REGULATION; SANTA-MONICA BASIN; FATTY-ACIDS; XIAOLANGDI RESERVOIR; REGULATION SCHEME; STABLE-ISOTOPES; LOWER REACHES; N-ALKANES; HUANGHE; RADIOCARBON;
D O I
10.1021/acs.est.8b04705
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Natural and human-induced hydrological changes can influence organic carbon (OC) composition in fluvial systems, with biogeochemical consequences in both terrestrial and marine environments. Here, we use bulk and molecular carbon isotopes (C-13 and C-14) to examine spatiotemporal variations in particulate OC (POC) composition and age from two locations along the course of the Yellow River during 2015 and 2016. Dual carbon isotopes enable deconvolution of modern, pre-aged (millennial age) soil, and fossil inputs, revealing heterogeneous OC sources at both sites. Pre-aged OC predominated at the upstream site (Huayuankou) throughout the study period, mostly reflecting the upper riverine OC. Strong downstream (Kenli) intra-annual variations in modern and pre-aged OC were caused by increased contributions from modern aquatic OC production under the drier and less turbid conditions during this El Nino year. The month of July, which included the human-induced water and sediment regulation (WSR) event at Kenli, accounted for 82% of annual POC flux, with lower modern OC contribution compared with periods of natural seasonal variability. Both natural and human-induced hydrological events clearly exert strong influence on both fluxes and composition of Yellow River POC which, in turn, affect the balance between OC remineralization and burial for this major fluvial system.
引用
收藏
页码:1119 / 1129
页数:11
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