Impacts of anthropogenic activities on weathering and carbon fluxes:a case study in the Xijiang Rive

• 作 者: Shi Yu Shiyi He Ping'an Sun Junbing Pu Jie Huang Huixian Luo Yongshan Li Rui Li Yaqiong Yuan
• 机 构: School of Environmental Studies,China University of Geosciences,Wuhan 430074,China;Karst Dynamics La
• 出 处: 国土资源部广西岩溶动力学重点实验室和国土资源部岩溶生态系统与石漠化治理重点实验室2016年度学术委员会会议
• 发表日期: 2016年6期
• 关键词: Anthropogenic activities Rock weathering DICcarbonate acid DICnitric acid sulfur

　　Monthly hydrogeochemical and discharge values were collected in the middle and upper reaches of the Xijiang River basin from April 2011 to March 2012 for the purpose of assessing the impact of anthropogenic activities on geological carbon sinks.The results of this study show that(1)the main ions in river water were influenced by different natural conditions and anthropogenic activities ;(2)in a hydrological year,weathering fluxes of dissolved inorganic carbon(DIC)were 50.00×108,1.52 ×108,and 1.79×108 kg CO2 in the Wuzhou,Zhaoping,and Yangshuo transects,respectively ; and furthermore,DICcarbonate acid(carbon flux caused by carbonic acid)were 37.71× 108,1.31 ×108,and 1.56 ×108 kg CO2,respectively,which represents approximately 31.56,10.15,and 15.29 g CO2 m-2 in the monitoring period ;(3)the carbon flux from the participation of allogenic acid(such as sulfuric acid or nitric acid)in carbonate rock weathering was obvious,which must be eliminated from the calculation of the net carbon sink in carbonate rock weathering because it would be released into the atmosphere as a carbon source ; and(4)in the geological processes,there was a clearly carbon sink loss caused by anthropogenic activities in various ways,which is attributed to the addition of nitric acid and sulfuric acid,such as through agricultural and industrial activities,and hydropower stations.