Luo Jia-Chen, Mao Rong, Li Si-Yue
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2018 Jul 8;39(7):3134-3141. doi: 10.13227/j.hjkx.201711098.
An extensive investigation on the main tributaries of the Three Gorges Reservoir (TGR) region was conducted in autumn (Oct. 2015), with focuses on riverine CO partial pressure (CO) and its associated controls. Our results indicated that CO in the main rivers of the TGR region ranged from 18.75 to 296.31 Pa, with a mean value of (141.06±77.51) Pa in the autumn, which was much higher than the atmospheric CO concentration. Therefore, the studied rivers acted as an atmospheric CO source, and the mean CO emission rate to the atmosphere was estimated at (101.1±78.0) mmol·(m·d). The highest and lowest values were (131.9±101.8) and (70.3±54.3) mmol·(m·d), respectively. CO in the main rivers of the TGR area was significantly related to DO, pH, and bicarbonate. Furthermore, the biogeochemical process of within-river respiration of organic carbon rather than photosynthesis resulted in negative relationships between CO and DO or pH because of the high velocities and short residence time in these mountainous rivers and streams. Our results will help to accurately develop the carbon budget for the rivers of the Three Gorges Region.
2015年10月秋季期间，对三峡水库（TGR）区域的主要支流进行了广泛调查，重点关注河流中二氧化碳分压（CO）及其相关控制因素。我们的结果表明，三峡水库区域主要河流中的CO范围为18.75至296.31帕，秋季平均值为（141.06±77.51）帕，远高于大气中的CO浓度。因此，所研究的河流充当了大气CO源，估计向大气排放的平均CO速率为（101.1±78.0）毫摩尔·（米·天）。最高值和最低值分别为（131.9±101.8）和（70.3±54.3）毫摩尔·（米·天）。三峡水库区域主要河流中的CO与溶解氧（DO）、pH值和碳酸氢盐显著相关。此外，由于这些山区河流和溪流流速快、停留时间短，河流内部有机碳呼吸而非光合作用的生物地球化学过程导致了CO与DO或pH值之间的负相关关系。我们的结果将有助于准确制定三峡地区河流的碳预算。
