秋季黄、渤海溶解碳水化合物的分布特征及影响因素

Distributions of dissolved carbohydrates and its influences factors in the Bohai Sea and the Yellow Sea during autumn

在黄海和渤海表层和微表层中采集了68个站位的海水样品,测定了秋季这两个海域总溶解有机碳(DOC)、叶绿素a、溶解态的单糖(monosaccharides,MCHO)、多糖(polysaccharides,PCHO)和总糖(total dissolved carbohydrate,TCHO)的浓度,对其在表层、微表层的分布,MCHO/TCHO、PCHO/TCHO比值的变化及其在微表层的富集情况进行了研究。结果表明在表层海水中,MCHO、PCHO和TCHO浓度分布呈现相似规律,均表现出近岸高、外海低的特点;TCHO/DOC在黄海和渤海中的平均值分别为13.8%和16.1%,说明碳水化合物是DOC的重要组成部分;PCHO/TCHO的比值与叶绿素a浓度呈正相关;黄、渤海海域中碳水化合物在微表层中呈现一定的富集作用,MCHO、PCHO、TCHO和DOC在黄海中的富集因子平均值分别为2.63、1.81、2.0和1.5,而富集程度的高低与风速、水体的扩散运动、鼓泡作用、悬浮颗粒物的表面吸附作用等因素相关。

Concentrations of monosaccharides（ MCHO）,polysaccharides（ PCHO） and total dissolved carbohydrates（ TCHO） in the Yellow Sea and the Bohai Sea were measured using TPTZ method in autumn. The distributions of MCHO,PCHO and TCHO in the surface seawater and microlayer seawater were studied. The results indicated that the horizontal distributions of MCHO,PCHO and TCHO displayed a decreasing trend from inshore to offshore sites. A significant positive relationship was found between PCHO / TCHO ratios and chlorophyll a concentrations; Carbohydrates exhibited enrichment in the microlayer,and average EF value of MCHO,PCHO,TCHO and DOC was 2. 63,1. 81,2. 0 and 1. 5,respectively. The extent of enrichment of carbohydrates in the microlayer was related with many factors such as wind speed,diffusion,scavenging bubbles and adsorption.