中文关键词高邮湖南四湖东平湖有色可溶性有机物(CDOM)生物可利用性平行因子分析(PARAFAC) 英文关键词Lake GaoyouLake NansiLake Dongpingchromophoric dissolved organic matter (CDOM)bioavailabilityparallel factor analysis (PARAFAC)

作者	单位	E-mail
张柳青	中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008 西华师范大学环境科学与工程学院, 南充 637000	zlq_1994@126.com
石玉	中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
李元鹏	中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
郭燕妮	中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
周蕾	中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008 中国科学院大学, 北京 100049
周永强	中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008	yqzhou@niglas.ac.cn
张运林	中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
杨艳	西华师范大学环境科学与工程学院, 南充 637000	sister_yy@sina.cn

中文摘要 有色可溶性有机物（CDOM）的生物可利用性直接反映其生物可降解潜力，影响水体中污染物质的迁移转化和水质优劣状况.本研究运用三维荧光光谱-平行因子分析法（EEMs-PARAFAC）结合室内微生物培养实验，分析了高邮湖、南四湖和东平湖CDOM光谱组成和荧光组分的生物可利用性特征，并进一步阐述其对丰水和枯水两种水文情景的响应.结果表明：①运用EEMs-PARAFAC方法解析出4种荧光组分，微生物作用类腐殖酸C1和陆源类腐殖酸C4，类色氨酸C2和类酪氨酸C3.② 3个湖泊丰水期吸收系数差值Δa（254）（培养前-培养后）均为正值，而枯水期Δa（254）部分为负值，这意味着CDOM生物可利用性对季节的响应存在较大差异.③不同水文情境下，南四湖和东平湖类腐殖酸组分%ΔC1、%ΔC4均为负值，南四湖丰、枯水期和东平湖丰水期类蛋白组分ΔC2~ΔC3为正值（t-test，P<0.001，P=0.005）.而丰水期高邮湖类蛋白组分ΔC2~ΔC3也为正值（t-test，P=0.008，P=0.005），这意味着不稳定类蛋白组分更容易被微生物矿化，可能生成更稳定的类腐殖酸.3个湖泊腐殖化指数HIX、荧光峰积分比值I_C：I_T均大于培养前，同时斜率S_275-295均减小进一步证实该结论.④丰、枯水期3个湖泊的类蛋白组分C2~C3的生物可利用性在入湖区域较高，同时该类湖泊入湖口区域类腐殖酸累积也较高，因而需要进一步加强入湖河流水质管理，减少外源CDOM输入以确保上述3个湖泊供水安全. 英文摘要 The bio-lability of chromophoric dissolved organic matter (CDOM) directly reflects its biodegradability potential, and also affects the migration and conversion of pollutants and impacts water quality. This study combines excitation-emission matrices and parallel factor analysis (EEMs-PARAFAC) with laboratory 28 days of bio-incubation experiments, and analyzed the bioavailability characteristics of CDOM samples collected from Lake Gaoyou, Lake Nansi and Lake Dongping in flood season and dry season. Our results showed that:① four fluorescent components were obtained using EEMs-PARAFAC, including a microbial humic-like C1, a terrestrial humic-like C4, a tryptophan-like C2, and a tyrosine-like C3. ② The differences of CDOM absorption pre-and post-incubation, i.e. Δa(254) of the three lakes were positive in the three lakes in the flood season, while partially negative in the dry season, indicating a quite different response of CDOM bioavailability to hydrological seasons. ③ Under different hydrological scenarios, the two humic-like components C1 and C4 increased post-bio-incubation compared with that pre-incubation for the samples collected from Lake Nansi and Lake Dongping, and the two protein-like components in Lake Nansi in both the flood and dry seasons and in Lake Dongping in the flood season (t-test, P<0.001, P=0.005) were lower in the post-than those pre-incubation. In Lake Gaoyou, C1-C3 post-incubation were significantly lower than pre-incubation (t-test, P=0.008, P=0.005). In the dry season, in comparison, C1-C4 except for C2 increased post-incubation than pre-incubation for Lake Gaoyou. This indicated that the protein-like components are unstable and more easily uptaken by microorganisms and may be potentially converted into more stable humic-like components. HIX and I_C:I_T of the three lakes increased post-incubation while the spectral slope S_275-295 decreased, which further confirmed the aforementioned conclusion. ④ During both the flood and dry seasons, the bioavailability of the protein-like components C2-C3 and the fluorescence intensity of C1 and C4 in the inflowing river mouths of the three lakes were higher than in the remaining lake regions. It is therefore necessary to strengthen the water quality management in the inflowing river mouths of the three lakes to maintain the water quality of the lakes.

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