Diel-scale variation of dissolved inorganic carbon during a rainfall event in a small karst stream in southern China

Environmental Science and Pollution Research International
Jun-Bing PuDao-xian Yuan

Abstract

Metabolic processes of the submerged aquatic community (photosynthesis and respiration) play important roles in regulating diel cycles of dissolved inorganic carbon (DIC) and sequestering carbon in a karst stream. However, little is known of whether diel DIC cycling occurs during rainfall in a karst groundwater-fed stream, even though this question is critical for the accurate estimation of what may be a major terrestrial carbon sink. Here, we measured diel variations of water chemical composition in a small karst groundwater-fed stream in southwest China during a rainfall event to assess the influences of rainfall and rising discharge on DIC diel cycling and the potential carbon sink produced by in-stream metabolism. Our results show that water chemical composition at the source spring (CK site) is relatively stable due to chemostatic behavior during rising discharge after a rainfall period. This site lacked submerged aquatic vegetation and, thus, had no diel variations in water chemistry. However, diel cycles of all hydrochemical parameters occurred at a site 1.3 km downstream (LY site). Diel variations in pH, DO, and δ13CDIC were inversely related to diel changes in SpC, DIC, Ca2+, and pCO2. These results indicated that diel...Continue Reading

References

Aug 21, 2004·Ground Water·Zaihua LiuJoe Meiman
Jun 5, 2013·Frontiers in Plant Science·Ole PedersenKaj Sand-Jensen
Nov 28, 2015·Ecology Letters·Caleb T HaslerCory D Suski
Feb 6, 2016·The Science of the Total Environment·Arún LoomanDamien T Maher
Dec 4, 2016·The Science of the Total Environment·Junbing PuDaoxian Yuan
Jul 25, 2017·The Science of the Total Environment·Tao ZhangDaoxian Yuan

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