Diurnal variations of pCO_2 in relation to environ-mental factors in the cascade reservoirs along the Wujiang River, China  

作　　者：PENG Xi WANG Baoli LIU Congqiang LIU Xiaolong WANG Fushun 

机构地区：[1]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China [2]Graduate University of Chinese Academy of Sciences,Beijing 100049,China [3]Applied Radiation Institute,School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200433,China

出　　处：《Chinese Journal Of Geochemistry》2012年第1期41-47,共7页中国地球化学学报

基　　金：supported by the Foundation of Chinese Academy of Sciences (Grant No. kzcx2-yw-137);National Natural Science Foundation of China (Grant Nos. 40721002 and 90610037)

摘　　要：We have investigated the diurnal variations of the pCO2 and related environmental factors in the cascade reservoirs with different trophic levels along Wujiang River. In surface water the pCO2 was 357±11 μatm in Hong-jiadu Reservoir, 338±48 μatm in Dongfeng Reservoir, 682±303 μatm in Wujiangdu Reservoir, and 1677±429 μatm in Liuguang, respectively. The results indicated that these cascade reservoirs had much lower pCO2 values in surface water than river did, and hypereutrophic reservoir showed larger diurnal variations of pCO2 than meso-eutrophic reservoir. In water column, pCO2 tended to increase with the depth. Phytoplankton and the environmental factors such as temperature and pH had different influences on pCO2 diurnal variations due to different trophic levels, and the effect of phytoplankton on pCO2 variation increased with the increase of trophic level in these reservoirs.We have investigated the diurnal variations of the pCO2 and related environmental factors in the cascade reservoirs with different trophic levels along Wujiang River. In surface water the pCO2 was 357±11 μatm in Hong-jiadu Reservoir, 338±48 μatm in Dongfeng Reservoir, 682±303 μatm in Wujiangdu Reservoir, and 1677±429 μatm in Liuguang, respectively. The results indicated that these cascade reservoirs had much lower pCO2 values in surface water than river did, and hypereutrophic reservoir showed larger diurnal variations of pCO2 than meso-eutrophic reservoir. In water column, pCO2 tended to increase with the depth. Phytoplankton and the environmental factors such as temperature and pH had different influences on pCO2 diurnal variations due to different trophic levels, and the effect of phytoplankton on pCO2 variation increased with the increase of trophic level in these reservoirs.

关 键 词：乌江渡水库 梯级水库 日变化 PCO2 中国 营养水平 环境因素 浮游植物 

分 类 号：X830.2[环境科学与工程—环境工程] TV697.11[水利工程—水利水电工程]