冬季东海海水中碳水化合物的分布及影响因素

本文采用TPTZ法测定了2010年冬季东海48个站位海水中溶解单糖（MCHO）、溶解多糖（PCHO）和溶解总糖（TCHO）的浓度，并对其水平分布和PN断面9个站位的垂直分布特征进行了研究。结果表明，表层海水中MCHO、PCHO与TCHO的平均浓度和范围分别为3.8（0.7~14.9）、6.9（1.1~20.8）和10.7（3.0~25.0）μmol C/L。水平分布大致呈现由近岸向外海递减的趋势，但是高值区各有不同，受各种水团如长江冲淡水、台湾暖流和黑潮的作用明显。冬季东海陆架海区海水垂直混合强烈，MCHO、PCHO及TCHO浓度分布在垂直方向上无明显规律，均在混合层（0~100 m）出现高值区分布。对长江口3个断面碳水化合物和环境因子的相关性研究表明，TCHO与温度、盐度均呈现显著的线性负相关，MCHO与叶绿素a（Chl a）呈现显著的线性正相关关系。

Distribution of dissolved carbohydrates and its influencing factors in the East China Sea during winter

Seawater samples were collected from 48 stations, including 9 vertical stations, in the East China Sea during winter in 2010. Concentrations of dissolved monosaccharides (MCHO), polysaccharides (PCHO) and total carbohydrates (TCHO) were measured with TPTZ method and their horizontal and PN vertical distributions were studied. The results showed that mean (range) concentrations of MCHO, PCHO and TCHO in the surface seawater were 3.8 (0.7~14.9), 6.9 (1.1~20.8) and 10.7 (3.0~25.0) μmol C/L, respectively. The horizontal distributions of carbohydrates were influenced by the Yangtze River Diluted Water, the Taiwan Warm Current and the Kuroshio, and generally exhibited a decreasing trend from inshore to offshore sites. No obvious pattern was observed in the vertical distribution of carbohydrates because of the strong vertical-mixing caused by the northeast wind in winter. The high values in the water column were found in the mixed layer (0~100 m). The correlation analysis between the carbohydrates concentrations and the environmental factors at 3 transects outside the Yangtze River Estuary. The results showed that concentrations of TCHO had a significant linear negative correlation with temperature and salinity, respectively, while the MCHO concentrations had a significant positive linear correlation with chlorophyll a (Chl a).