Ni Hong-Gang, Lu Feng-Hui, Luo Xian-Lin, Tian Hui-Yu, Zeng Eddy Y
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Mar Pollut Bull. 2008 Jun;56(6):1150-7. doi: 10.1016/j.marpolbul.2008.02.030. Epub 2008 Apr 18.
A total of 1008 samples were collected from the eight major riverine runoff outlets in the Pearl River Delta (PRD) during 2005-2006 to estimate the fluxes of total organic carbon (TOC) to the coastal ocean off South China. The average dissolved organic carbon (DOC) concentration was 1.67 mg/L with a range of 1.38-2.13 mg/L. Concentrations of particulate organic carbon (POC) ranged from 2.66-4.12% of total suspended particulate matter (SPM). The fluxes of TOC and SPM from the PRD via the eight outlets were 9.2 x 10(5) and 2.5 x 10(7)tons/yr, respectively. Temporal variations in POC and DOC were observed at all outlets due to the large variability in runoff levels because of the seasonality of rainfall, and the riverine discharge amount was an important factor controlling TOC flux. The net contribution of organic carbon from the PRD to the coastal ocean represented approximately 0.1-0.2% of total organic carbon transported by rivers worldwide.
2005年至2006年期间，从珠江三角洲（PRD）的八个主要河流径流出口共采集了1008个样本，以估算向中国南部沿海海洋输送的总有机碳（TOC）通量。溶解有机碳（DOC）的平均浓度为1.67毫克/升，范围在1.38 - 2.13毫克/升之间。颗粒有机碳（POC）的浓度范围为总悬浮颗粒物（SPM）的2.66 - 4.12%。通过八个出口从珠江三角洲输出的TOC和SPM通量分别为9.2×10⁵吨/年和2.5×10⁷吨/年。由于降雨季节性导致径流水平变化很大，所有出口处均观测到POC和DOC的时间变化，河流排放量是控制TOC通量的一个重要因素。珠江三角洲向沿海海洋输送的有机碳净贡献约占全球河流输送的总有机碳的0.1 - 0.2%。
