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- W2392739322 abstract "Diurnal variations in hydrochemistry were monitored at a spring and two pools in a travertine-depositing stream at Baishuitai,Yunnan,SW China.Water temperature,pH and specific conductivity were measured in intervals of 5 and 30 minutes for periods of 1 to 2 days.From these data the concentrations of Ca~(2+),HCO~-_3,calcite saturation index,and CO_2 partial pressure were derived.The measurements in the spring of the stream did not show any diurnal variations in the chemical composition of the water.Diurnal variations,however,were observed in the water of the two travertine pools downstream.In one of them rise in temperature(thus more CO_2 degassing) during day time and consumption of CO_2 due to photosynthesis of submerged aquatic plants accelerated the deposition of calcite,whereas in the other pool,where aquatic plants flourished and grew out of the water(so photosynthesis were taking place in the atmosphere),obervations suggest that temperature-dependent root respiration underwater took place,which dominated until noon.Consequently,due to the release of CO_2 by the root respiration into water,which dominated CO_2 production by degassing induced by temperature increase,the increased dissolution of calcite was observed.This is the first time anywhere that the effect of root respiration on the diurnal hydrochemical variations has been observed.Given that the temperature of the Baishuitai stream waters is a function of insolation,changes in the travertine deposition downstream under the base flow conditions are a direct function of the prevailing weather.This has implications for the paleoclimatic interpretation of fossil travertine deposits.Fossil travertine may also provide information on growth status of the paleo-aquatic plants,which could complicate the paleo-environmental interpretation." @default.
- W2392739322 created "2016-06-24" @default.
- W2392739322 creator A5003855092 @default.
- W2392739322 date "2005-01-01" @default.
- W2392739322 modified "2023-09-26" @default.
- W2392739322 title "Diurnal variations in hydrochemistry in a travertine-depositing stream at Baishuitai,Yunnan,SW China: Observations and Explanations" @default.
- W2392739322 hasPublicationYear "2005" @default.
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