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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Chemical characteristics and CO2 consumption of the Qingshuijiang River Basin, Guizhou Province, Southwestern China

Jiemei Lü, Yanling An, Qixin Wu, SHaoqi Zhou, Yonggui Wu
Geochemical Journal, Vol. 52, No. , P. 441-456, 2018

ABSTRACT

Water samples were collected and analyzed for major ions in the dry season and wet season in the Qingshuijiang River Basin, to understand ion compositions and solute fluxes as related to rock weathering and associated CO2 consumption rates. The total dissolved solids (TDS) varied from 35.29 to 740.90 mg·L–1, and the mean value (217.5 mg·L–1) was significantly higher than the global rivers. Ca2+ and HCO3, dominated the ionic composition, accounting for approximately 61.95% of the total ionic budgets. TDS and major element concentrations decreased from the upstream to the downstream. Correlation and spatial distribution analysis showed that anthropogenic activities had a significant effect on water chemistry, probably contributed some 4.87% of the dissolved solutes. The chemical weathering rates were estimated to be 65.43 t·(km2·a)–1 (55.01 t·(km2·a)–1 and 10.42 t·(km2·a)–1 by carbonate and silicate weathering, respectively), comparable to the Changjiang River in China, but significantly higher than the average of world rivers. Atmospheric CO2 consumption rates by rock weathering within the basin was 72.57 × 104 mol·(km2·a)–1, 2.95 times the global average. Furthermore, the atmospheric CO2 consumption by the rock weathering was estimated to be 12.45 × 109 mol·a–1 (7.86 × 109 mol·a–1 by carbonate weathering and 4.59 × 109 mol·a–1 by silicate weathering, respectively), accounting for 0.11% of the global total consumption fluxes. The CO2 consumed by rock chemical weathering in the Qingshuijiang River Basin may constitute a significant part of the global carbon budget due to the intense CO2 consumption even though with the small area in the world.

KEYWORDS

water chemistry, chemical weathering rate, CO2 consumption, karst river, Qingshuijiang River

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