西江河口段溶解无机碳稳定同位素组成的时空变化

X13; For researching the spatio-temporal variation of the stable isotopic composition of the riverine dissolved inorganic carbon (DIC), we had carried out a survey throughout the hydrologic year during which the δ13CCIC of the surface water and its physicochemical pa- rameter were examined along the Xijiang River Inner Estuarine waterway from September 2006 to June 2007. There was a striking seasonal variation on the average δ13CDIC, as the average δ13CDIC in summer (-13.91‰) or autumn (-13.09‰) was much less than those in spring (-11.71‰) or winter (-12.26‰). The riverine δ13CDIC was controlled by decomposed condition of the riverine organic matter linking the seasonal variation of the physicochemical parameter in the surface water according to the correlation analysis which indicated notable relations between δ13CDIC and water temperature (p = 0.000; r = -0.569) or between (δ13CDIC and oxide-reduction potential (p = 0.000; r = 0.646). The striking positive correlation between δ13CDIC and the sampling distan