南昌市湖水可溶解无机碳与碳同位素特征及其影响因素分析

摘要

This paper studied concentration of DIC and Carbon isotopes' composition in 7 major lakes and Gan-jiang river in Nanchang, resulting that; concentration of DIC and Carbon isotopes in the lakes differ greatly with Ganjiang river; concentration of DIC in the lakes is higher in spring than fall, DIC Carbon isotopes in reverse, whereas, concentration of DIC and Carbon isotopes at Ganjiang river barely change with seasons.Aquatic plants in the lakes flourish, but water at Ganjiang river is clear with much fewer aquatic plants.Thus, concentration of DIC and Carbon isotopes in the lakes are influenced by aquatic plants, while concentration of DIC and Carbon isotopes in Ganjiang river depend more on balance of CO2 in water and atmosphere.%研究了南昌市内7个主要湖泊和赣江水体春秋季可溶解无机碳(DIC)浓度和碳同位素组成.结果表明,各湖泊水体可溶解无机碳浓度与碳同位素与赣江水体差别较大；湖泊水体DIC浓度春季高于秋季,而DIC碳同位素则相反,而赣江水体DIC浓度和碳同位素值几乎不随季节变化.南昌市湖泊内水生植物繁盛,而市内赣江段水体清澈,水生植物较少,反映湖泊水体中DIC浓度和碳同位素组成受水生植物的影响,而赣江水体DIC浓度与碳同位素组成更多取决于水体与大气中CO2的收支平衡.