2017年春季黄东海碳水化合物的分布特征

本文采用TPTZ（2，4，6-三吡啶-s-三嗪，C₁₈H₁₂N₆）分光光度法，测定了2017年春季南黄海和中国东海海水中的溶解态单糖（MCHO）、多糖（PCHO）及总糖（TCHO）的浓度，对比了南黄海和东海表层海水中MCHO、PCHO和TCHO的浓度分布特征。结果表明，南黄海表层海水中碳水化合物浓度高于东海。通过对南黄海B断面和东海P断面的调查发现，B断面MCHO、PCHO和TCHO分布趋势总体为近岸高、远岸低，表层高、底层低，而P断面由于受到长江冲淡水、台湾暖流和黑潮的综合影响，MCHO、PCHO和TCHO未表现出与B段面相似的分布特征。对E2站位的周日变化观测结果显示，MCHO、PCHO和TCHO的高值主要集中在12:00－18:00时段，低值区段主要集中在4:00－8:00时段，PCHO和TCHO呈线性正相关，MCHO与PCHO没有相关性，但是MCHO的浓度高峰滞后于PCHO的浓度高峰，这可能是由于PCHO被分解，断裂糖苷键释放MCHO所致。

Study on the distribution of dissolved carbohydrates in the South Yellow Sea and the East China Sea during spring

Concentrations of monosaccharides (MCHO), polysaccharides (PCHO) and total dissolved carbohydrates (TCHO) were measured with 2, 4, 6-tripyridyl-s-triazine (TPTZ) method in the seawater of the South Yellow Sea and the East China Sea during spring.Our results showed that the concentrations of dissolved carbohydrates in South Yellow Sea were higher than those in the East China Sea.Moreover, distributions of MCHO, PCHO and TCHO at transect B of the South Yellow Sea and transect P of the East China Sea were investigated.The results indicated that the vertical distributions of MCHO, PCHO and TCHO at transect B displayed decreasing trend from inshore to offshore sites as well as from surface seawater to bottom seawater.In contrast, the vertical distributions of MCHO, PCHO and TCHO at transect P did not show similar trend due to the influences of the Changjiang diluted water, Taiwan warm current and Kuroshio.The results of diel variations at station E2 suggested that high peaks of MCHO, PCHO and TCHO appeared from 12:00 to 18:00 and low peaks appeared from 4:00 to 8:00.In addition, TCHO was positively correlated with PCHO, and MCHO had no correlation with PCHO.However, MCHO peaks lagged behind PCHO peaks, which might be because PCHO was decomposed to release MCHO by breaking the glycoside bond.