Karst Related Carbon Sink Flux Driven by Water Cycle in Typical Karst Catchments of Guizhou Province and Its Main Controlling Factors
Hydrological and Hydrochemical variations of the three karst catchments,Banzhai,Huanghou(both in peak-cluster depression region) and Houzhai(in plateau hilly region)with similar subtropical monsoonal climate in South Guizhou Province were monitored with high-resolution hydrological and hydrochemieal automatic data loggers during the period of May 2007-October 2013.Linear correlations between bicarbonate,calcium and magnesium concentrations with electrical conductivity were established with titration in field and chemical analysis in laboratory of major components of discharge waters.The continuous data of CO2 partial pressure,calcite saturation index and karst related carbon sink were therefore calculated.Statistical analyses show that the annual average karst related carbon sink fluxes in Banzhai,Huanghou and Houzhai karst catchments were 29,33 and 39 t-CO2 km-2a-1,respectively.There is a chemostatic behavior of bicarbonate ion in the catchments.Runoff(karst river discharge)plays a key role in controlling the karst related carbon sink flux.
NETL
NSTL
万方数据
维普
