双台子河口水体有机碳分布特征研究

Distribution of Organic Carbon in the Estuary of the Shuangtaizi River

于2011年5月和8月通过研究双台子河口水体溶解有机碳（DOC）、颗粒有机碳（POC）和化学耗氧量（COD）的分布特征,阐述双台子河口水体有机碳的河口过程及其影响因素,并探讨总有机碳（TOC）和COD表征河口有机污染的区域性和季节性特征.研究表明：2011年5月双台子河口DOC、POC和COD含量范围分别为4.04～5.06 mg/L（平均4.60mg/L）、2.93～10.85 mg/L（平均7.01 mg/L）和5.65～14.07 mg/L（平均9.04 mg/L）;8月分别为10.87～46.04 mg/L（平均26.75 mg/L）、0.88～17.27 mg/L（平均4.16 mg/L）和2.42～67.62 mg/L（平均17.85 mg/L）.DOC、POC和COD的含量由河到海总体呈现逐渐降低的趋势,双台子河口不同区段DOC、POC和COD的时空分布,及其主要和次要影响因素具有一定的差别.有机碳来源和海水的稀释作用是影响双台子河口有机碳分布的主要因素,现场生物生产和悬浮颗粒物影响较小.双台子河口水体中TOC和COD呈现线性不显著正相关关系,二者关系的季节差异显著.

Dissolved and particulate organic carbon （DOC and POC）, as well as chemical oxygen demand （COD） were investigated on the Estuary of the Shuangtaizi River in May and August, 2011. Results showed that DOC, POC and COD ranged at 4.04-5.06, 2.93-10. 85 and 5.65-14. 07 mg/L, with the averages at 4.60, 7.01 and 9.04 mg/L in 2.42-67.62 mg/L, with the averages at 26.75, May, while those at 10.87-46.04, 0. 88-17.27 and 4.16 and 17.85 mg/L in August, correspondingly. DOC, POC and COD gradually reduced from fresh water to sea water. The input of organic carbon and dilution of the seawater were the primary reasons to control the distribution of organic carbon in the Estuary of the Shuangtaizi River, followed by the biological production in situ and patterns of suspended particles. However, the complexity of the estuary processes led to clear special and temporal variations on DOC, POC and COD. A non-significant linear relationship was presented between TOC and COD in the studying area, as well as a different relationship between May and August.