九龙江流域河水溶解态碳的时空变化

Temporal and Spatial Variations of Dissolved Carbon in the Jiulongjiang River Basin

为了研究九龙江流域河流中溶解碳变化规律,分别于2017年7月与2018年1月对九龙江河水溶解无机碳(DIC)与溶解有机碳(DOC)进行了分析。丰水季河水DIC浓度为7. 50~49. 04 mg/L,平均值为22. 12 mg/L,枯水季DIC浓度为8. 84~84. 91 mg/L,平均浓度41. 17 mg/L,丰水季河水中的DOC浓度为0. 54~2. 89 mg/L,平均值为1. 04 mg/L,枯水季河水中DOC浓度变化在1. 34~3. 56 mg/L之间,平均值为2. 34 mg/L,据此计算了九龙江河水DOC、DIC的入海通量。研究结果表明九龙江河水中溶解碳具有显著的时空变化特征,通过与中国其他河流溶解碳数据对比,解释了碳酸盐岩的风化、气候变化、河流中浮游植物以及人类活动对九龙江河流溶解碳浓度的影响。

In order to study the variations of dissolved carbon in Jiulongjiang River,the water samples were collected in July 2017and January 2018,respectively,and dissolved inorganic carbon (DIC)and dissolved organic carbon (DOC)in rivers waters were also analyzed.The concentrations of DIC in river water are between 7.50and 49.04mg/L in the wet season,and the average value is 22.12mg/L.The DIC concentrations in the dry season are between 8.84and 84.912mg/L and the average value is 41.17mg/L.The DOC concentrations in the river water during the wet season are between 0.54and 2.89rag/L,average concentration is 1.04mg/L, dry season water DOC concentrations are and 1.34-3.56mg/L,average concentration is 2.34mg/L.The results show that the dissolved carbon in Jiulongjiang River has significant temporal and spatial characteristics.On the base of the discharge of Jiulongjiang River,we also calculated budget of dissolved carbon to the sea.This paper analyzes the dissolved carbon data from different tributaries in the Jiulongjiang River,combines with previous dissolved carbon data from other rivers in China,we disclose the controlling factors of dissolved carbon in river waters.And we also understand the effects of weathering of carbonate rocks,climate change, phytoplankton in rivers,and human activities on dissolved carbon concentrations in rivers.