CAJ | 학술논문

以太湖流域西北部殷村港和陈东港两条入湖河流为研究对象,于2012年9月至2013年8月每月采集表层水体样品,测定了水温、叶绿素a浓度和浮游细菌丰度,并分析了溶解性有机碳DOC( dissolved organic carbon)浓度及其碳稳定同位素特征值(δ13CDOC )、紫外吸光度SUVA254( specific UV absorbance)以及溶解性碳水化合物浓度的变化规律.结果表明,殷村港和陈东港δ13CDOC变化范围为-27.03‰±0.30‰~-23.38‰±0.20‰,以外源性碳为主.浮游植物光合作用产物的释放和外源输入是河流中溶解性碳水化合物的主要来源.两条入湖河流中多糖PCHO( polysaccharides)和单糖MCHO( monosaccharides)浓度在春夏季与秋冬季具有显著差异(P﹤0.01, n＝12；P﹤0.01, n＝12).这与碳水化合物的来源及组分的可利用性有关.秋冬季藻类消亡过程中释放的 PCHO 在低温下不易被降解,容易堆积,因此两条入湖河流总溶解性碳水化合物 TCHO ( total dissolved carbohydrates)以PCHO为主；而在春夏季,随着温度升高,PCHO被微生物分解利用转化为MCHO, MCHO是TCHO中主要组分.
이태호류역서북부은촌항화진동항량조입호하류위연구대상,우2012년9월지2013년8월매월채집표층수체양품,측정료수온、협록소a농도화부유세균봉도,병분석료용해성유궤탄DOC( dissolved organic carbon)농도급기탄은정동위소특정치(δ13CDOC )、자외흡광도SUVA254( specific UV absorbance)이급용해성탄수화합물농도적변화규률.결과표명,은촌항화진동항δ13CDOC변화범위위-27.03‰±0.30‰~-23.38‰±0.20‰,이외원성탄위주.부유식물광합작용산물적석방화외원수입시하류중용해성탄수화합물적주요래원.량조입호하류중다당PCHO( polysaccharides)화단당MCHO( monosaccharides)농도재춘하계여추동계구유현저차이(P﹤0.01, n＝12；P﹤0.01, n＝12).저여탄수화합물적래원급조분적가이용성유관.추동계조류소망과정중석방적 PCHO 재저온하불역피강해,용역퇴적,인차량조입호하류총용해성탄수화합물 TCHO ( total dissolved carbohydrates)이PCHO위주；이재춘하계,수착온도승고,PCHO피미생물분해이용전화위MCHO, MCHO시TCHO중주요조분.
Surface water samples of Yincungang and Chendonggang Rivers were collected from September 2012 to August 2013 in Lake Taihu. Water temperature, Chlorophyll a and bacterial abundance were analyzed, as well as dissolved organic carbon ( DOC ) concentrations, stable carbon isotope of DOC (δ13CDOC ) , specific UV absorbance ( SUVA254 ) and dissolved carbohydrates concentrations. δ13CDOC ranged from-27. 03‰± 0. 30‰to-23. 38‰± 0. 20‰, indicating a terrestrial source. Both the autochthonous and allochthonous sources contributed to the carbohydrates pool in the tributaries. Significant differences in PCHO ( polysaccharides) and MCHO (monosaccharides) concentrations were observed between spring-summer and autumn-winter ( P ﹤0. 01, n =12; P ﹤0. 01, n=12), which might be caused by the variation in the sources and bioavailability of carbohydrates. PCHO contributed a major fraction to TCHO ( total dissolved carbohydrates) in autumn and winter, which could be explained by the accumulation of undegradable PCHO limited by the low water temperature; MCHO contributed a major fraction to TCHO in spring and summer, which might be caused by the transformation from PCHO by microbes at high water temperature.