Combined use of radiocarbon and stable carbon isotope to constrain the sources and cycling of particulate organic carbon in a large freshwater lake, China

被引：51

作者：

Chen, Jingan ^{[1
]}

Yang, Haiquan ^{[1
]}

Zeng, Yan ^{[1
]}

Guo, Jianyang ^{[1
]}

Song, Yilong ^{[1
]}

Ding, Wei ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2018年 / 625卷

基金：

中国国家自然科学基金;

关键词：

Radiocarbon; Stable carbon isotope; Particulate organic carbon; Sources and cycling; Large freshwater lake; DEEP LAKE; MATTER; FUXIAN; DOC; DELTA-C-14; QUALITY; SIZE; C-14; ASSIMILATION; VARIABILITY;

D O I：

10.1016/j.scitotenv.2017.12.275

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The concentrations and isotopic compositions of dissolved inorganic carbon (DIC) and particulate organic carbon (POC) were measured in order to better constrain the sources and cycling of POC in Lake Fuxian, the largest deep freshwater lake in China. Model results based on the combined delta(13)Cand Delta C-14, showed that the average lake-wide contributions of autochthonous POC, terrestrial POC, and resuspended sediment POC to the bulk POC in Lake Fuxian were 61%, 22%, and 17%, respectively. This indicated autochthonous POC might play a dominant role in sustaining large oligotrophic lake ecosystem. A mean 17% contribution of resuspended sediment POC to the bulk POC implied that sediment might have more significant influence on aquatic environment and ecosystem than previously recognized in large deep lakes. The contributions of different sources POC to the water- column POC were a function of the initial composition of the source materials, photosynthesis, physical regime of the lake, sediment resuspension, respiration and degradation of organic matter, and were affected indirectly by environmental factors such as light, temperature, DO, wind speed, turbidity, and nutrient concentration. This study is not only the first systematic investigation on the radiocarbon and stable isotope compositions of POC in large deep freshwater lake in China, but also one of themost extensive radiocarbon studies on the ecosystemof any great lakes in theworld. The unique data constrain relative influences of autochthonous POC, terrestrial POC, and resuspended sediment POC, and deepen the understanding of the POC cycling in large freshwater lakes. This study is far from comprehensive, but it serves to highlight the potential of combined radiocarbon and stable carbon isotope for constraining the sources and cycling of POC in large lake system. More radiocarbon investigations on the water-column POC and the aquatic food webs are necessary to illuminate further the fate of autochthonous POC, terrestrial POC, and resuspended sediment POC, and their eco-environmental effects. (c) 2017 Elsevier B.V. All rights reserved.

引用

页码：27 / 38

页数：12

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