Li Gan-rong, Liu Cong-qiang, Chen Chuan, Wang Bao-li, Li Jun, Li Si-liang, Liu Xiao-long, Wang Fu-shun
School of Life Science, Guizhou Normal University, Guiyang 550001, China.
Huan Jing Ke Xue. 2009 Oct 15;30(10):2891-7.
Water samples along water column in the front of dams and samples at 0.5 m below surface water from tributary rivers were collected in July and October, 2007. The water chemistry, concentrations of dissolve inorganic carbon and its carbon isotopic compositions were determined, in order to investigate the geochemical behavior of carbon in the Maotiao River. This study aimed to understand the variations of the concentrations of dissolved inorganic carbon (DIC) and delta13 C(DIC) during its transport along the cascade reservoirs and river system. The results showed that DIC concentrations in summer were lower than that in autumn. In summer, the DIC concentrations were 1.35-2.84 mmol/L, with an average value of 2.12 mmol/L; and in autumn they fell into 2.03-3.98 mmol/L, with an average value of 2.67 mmol/L. The delta13 CD1 in surface water along Maotiao River ranged from -10.3% per hundred to -5.1% per hundred in summer, with a value of -8.6% per hundred in average, and in autumn, delta3 C(DIC) became more negative, and had a range from -13.0% per hundred to -6.9% per hundred, with an average value of -9.0% per hundred. Generally, DIC in surface water showed a trend to decrease from the upper reaches to lower reaches along Maotiao River, and t3 Cc1 gradually becam me more negative downstream. On the water column, DIC concentrations were higher in hypolimnion, while a delta13 C(DIC) had a reverse trend with higher values occurred in epilimnion. The results indicated that the hydrochemistry of river could be significantly changed by river damming processes. As for carbon, reservoir should be an important place for the transformation among the different carbon species.
2007年7月和10月，采集了大坝前端水柱中的水样以及支流距地表水表面以下0.5米处的水样。测定了水化学性质、溶解无机碳浓度及其碳同位素组成，以研究猫跳河碳的地球化学行为。本研究旨在了解溶解无机碳（DIC）浓度和δ13C（DIC）在其沿梯级水库和河流系统输送过程中的变化。结果表明，夏季DIC浓度低于秋季。夏季，DIC浓度为1.35 - 2.84 mmol/L，平均值为2.12 mmol/L；秋季则为2.03 - 3.98 mmol/L，平均值为2.67 mmol/L。猫跳河地表水的δ13CD1在夏季范围为-10.3‰至-5.1‰，平均值为-8.6‰，秋季时，δ3C（DIC）变得更负，范围为-13.0‰至-6.9‰，平均值为-9.0‰。总体而言，猫跳河地表水的DIC沿上游至下游呈降低趋势，而δ13Cc1在下游逐渐变得更负。在水柱上，DIC浓度在湖下层较高，而δ13C（DIC）则相反，在湖上层较高。结果表明，筑坝过程可显著改变河流的水化学性质。对于碳而言，水库应是不同碳物种转化的重要场所。
