论文部分内容阅读
采用多参数水质分析仪,对重庆金佛山药池坝湖水的地球化学、碳氧同位素特征及其昼夜变化进行研究,结果表明:研究区湖水温度、pH值、溶解氧、电导率、δ13 CDIC和δ~(18) O等指标均表现出明显的昼夜变化规律,水温、pH值、溶解氧和δ~(13)CDIC等指标白天升高,夜间降低,电导率白天降低,夜间升高,表明湖水溶解无机碳变化过程受到物理因素和生物作用的共同影响.山地岩溶湖泊地球化学指标与δ~(13)CDIC对外界环境敏感,湖泊蒸发强烈,水体中溶解无机碳(DIC)滞留时间长,湖水与大气CO_2交换程度高,使湖水δ~(13)CDIC值偏正,接近平衡状态.湖水蒸发线斜率较小,截距较大,氢氧同位素组成主要受大气降水氧同位素组成、湖泊水-气界面蒸发过程中的同位素动力分馏效应和湖底水-岩氧同位素交换的影响.
The multi-parameter water quality analyzer was used to study the geochemical and carbon-oxygen isotopic characteristics and the diurnal variation of the lake in Jinfo Mountain in Chongqing. The results show that the temperature, pH value, dissolved oxygen, conductivity, δ13 CDIC and δ 18 O and other indexes all showed obvious diurnal variation. The indexes of water temperature, pH, dissolved oxygen and δ ~ (13) CDIC increased during the day, decreased at night, decreased at daytime and decreased at night, The changes of dissolved inorganic carbon in lake water are affected by both physical and biological effects. The geochemical indicators of δ13CDIC in mountainous karst lakes are sensitive to the external environment, the lake evaporates strongly, the residence time of dissolved inorganic carbon (DIC) The exchange of CO 2 between the lake and the atmosphere is high, which makes the δ 13 CDIC of the lake to be more or less positive and close to equilibrium. The slope of the evaporation line of the lake is smaller and the intercept is larger. The composition of hydrogen and oxygen isotopes is mainly composed of oxygen isotope composition of atmospheric precipitation, EFFECT OF ISOTOPIC FESTIVITY PARTITION DEPRESSION AND WATER - OXYGEN IS OXYGEN ISOTOPIC EXCHANGE AT ELEVATION OF AIR INTERFACE.