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Using the Guancun River,an underground stream-fed river,in Rong’an County of Guangxi, China as a case study,the daily biochemical cycle was examined in this paper based on the data collected a weeklong via high resolution data logger monitoring and high-frequency sampling. Furthermore,the loss of inorganic carbon along its flow path was estimated.Results show that chemical components of the groundwater input are quite stable,showing little change extent;while all of the chemical parameters from two downstream monitoring stations show diel variation over the monitoring period,suggesting that plant activity in the river has a strong influence on water chemistry of the river.The comparison of the input fluxes from the groundwater with the output fluxes of HCO_3~- estimated at the downstream monitoring station during the high-frequency sampling period shows a strong decrease of HCO_3~-,indicating that the river is losing inorganic carbon along its flow path.The loss is estimated to be about 1,152 mmol/day/m of HCO_3~- which represent about 94.9 kg/day of inorganic carbon along the 1,350 m section of the Guancun River.It means that HCO_3~- entering the river from karst underground stream was either consumed by plants or trapped in the authigenic calcite and thus constitutes a natural sink of carbon for the Guancun karst system.
Using the Guancun River, an underground stream-fed river, in Rong’an County of Guangxi, China as a case study, the daily biochemical cycle was examined in this paper based on the data collected a week long via high resolution data logger monitoring and high -frequency sampling. Furthermore, the loss of inorganic carbon along its flow path was estimated. Results show that chemical components of the groundwater input are quite stable, showing little change extent; while all of the chemical parameters from two downstream monitoring stations show diel variation over the monitoring period, suggesting that plant activity in the river has a strong influence on water chemistry of the river. the comparison of the input fluxes from the groundwater with the output fluxes of HCO_3 ~ - estimated at the downstream monitoring station during the high- frequency sampling period shows a strong decrease of HCO_3 ~ -, indicating that the river is losing inorganic carbon along its flow path. The loss is estimated to be abou t 1,152 mmol / day / m of HCO 3 ~ - which represent about 94.9 kg / day of inorganic carbon along the 1,350 m section of the Guancun River. It means that HCO 3 ~ - entering the river from karst underground stream was either consumed by plants or trapped in the authigenic calcite and thus constituted a natural sink of carbon for the Guancun karst system.