Abstract:Data were collected in two cruises in February and May 2012 in the Yangtze River Estuary, and the spatial- temporal distribution and transportation of particulate organic carbon (POC) and its affecting factors were analyzed. POC concentration in the estuary ranged 0.23~31.61mg/L in spring with average of 2.55mg/L, which was obviously higher than that in winter (0.16~5.82mg/L with average 1.42mg/L). Spatial distribution showed that POC concentration decreased seaward and the highest value occurred in the coastal zones and the mouth area, meanwhile POC concentration was higher in bottom layer than in the surface. POC was strongly and positively related to total suspended matter (TSM), but weakly to chlorophyll a (Chl a), which indicated that a large impact by terrestrial inputs on the POC distribution. POC/Chl a ratio revealed that organic detritus was the main source and carrier of POC. In addition, the contribution of phytoplankton biomass to POC could become explicit but very small for only 1.26% and 0.9% when TSM content was less than 110and 100mg/L in spring and winter, respectively. Organic carbon was transported into sea mainly in particulate form when TSM content was higher than 117 and 335mg/L in spring and winter, respectively, or otherwise in dissolved form. Only 0.9% or 0.4% of the POC was conveyed into the estuary in suspended matter, and 89% or 69% of POC would be filtrated by and deposited in the maximum turbidity zone in spring or winter, respectively.
邢建伟, 线薇微, 绳秀珍. 春、冬季长江口颗粒有机碳的时空分布及输运特征[J]. 中国环境科学, 2014, 34(9): 2380-2386.
XING Jian-Wei, XIAN Wei-Wei, SHENG Xiu-Zhen. Spatial-temporal distribution and transportation of particulate organic carbon in the Yangtze River Estuary in spring and winter 2012. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2380-2386.