ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
广西桂林漓江典型河段水化学昼夜动态变化 及其对岩溶碳循环的影响
  
关键词:aqueous chemistry  day and night changes  photosynthesis  watershed geological background  Lijiang of Guilin
基金项目:中国地质科学院基本科研业务费项目(编号: YYWF201639)
作者单位E-mail
章程 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室
联合国教科文组织国际岩溶研究中心 
chzhang@karst.ac.cn 
肖琼 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室
联合国教科文组织国际岩溶研究中心 
 
苗迎 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室
联合国教科文组织国际岩溶研究中心 
 
郭永丽 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室
联合国教科文组织国际岩溶研究中心 
 
汤庆佳 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室
联合国教科文组织国际岩溶研究中心 
 
郝玉培 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室
联合国教科文组织国际岩溶研究中心 
 
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摘要:
Day and Night Aqueous Chemical Changes and Their Impact on Karst Carbon Cycle at Typical Monitoring Sites of the Lijiang River, Guilin, Guangxi
      The study of day and night aqueous chemistry in karst region provides the foundation for river monitoring planning at the yearly scale and flux estimation of carbon cycling. The Lijiang River, a typical medium river in southwest China karst region, was selected in this study. 2-day monitoring work with high resolution data logger and high frequency sampling at 2-hour interval was conducted at four sites of the Lijiang River. Day and night change of hydrochemistry and its variation along the river flow were investigated and the influences of geological background, photosynthesis and metabolism were analyzed. The results show that the changes in aqueous chemistry at four sites are quite different with varied day and night cycling features. Total ion concentration in the reaches charged by silicate-dominant rock area is much lower than that in the reaches of carbonate-dominant rock area. Controlled directly by geological background, water temperature, pH value, specific conductivity, and concentrations of Ca2+ and HCO– 3 increase from northern mountain area to southern karst peak-forest plain, i.e., from the upstream area to the downstream area, by 3.63 ℃, 1.99, 125.23 μS/cm, 22.42 mg/L, and 73.32 mg/L respectively. Day and night changes of dissolved oxygen, pH, specific conductivity, concentrations of Ca2+ and HCO– 3, δ13CDIC are mainly caused by photosynthesis of aquatic vegetation, with maximum amplitude being 19.4 mg/L, 2.02, 56.4 μS/cm, 12 mg/L, 48.8 mg/L, and –2.05‰ respectively. Con-centration changes of K+, Na+, NO– 3 are mainly controlled by the metabolism process (assimilation). Along the reaches near Guilin City, vegetation photosynthesis consumes dissolved inorganic carbon simultaneously with calcite precipitation, which can influence saturation with respect to calcium and partial pressure of CO2 and result in decrease of pCO2 pressure and the formation of over-saturated waterbody during the daytime, thus inhibiting the degassing process in the water-gas interface. Moreover, at the downstream area near Ynagshuo Town, waterbody is over-saturated during the monitoring period and pCO2 values are close to the value equivalent to atmospheric CO2, suggesting the decrease of degassing potentiality with the increase of waterflow path. This means that carbon sink resulting from karst processes is relatively stable during the winter season in Lijiang watershed.
ZHANG Cheng,XIAO Qiong,MIAO Ying,GUO Yong-li,TANG Qing-jia,HAO Yu-pei.2018.Day and Night Aqueous Chemical Changes and Their Impact on Karst Carbon Cycle at Typical Monitoring Sites of the Lijiang River, Guilin, Guangxi[J].Acta Geoscientica Sinica,39(5):613-621.
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