| 东部地区大型湖库有色可溶性有机物来源组成及潜在驱动因素 |
| 摘要点击 1811 全文点击 628 投稿时间：2021-08-24 修订日期：2021-09-11 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 长潭水库 太湖 洪泽湖 高邮湖 有色可溶性有机物(CDOM) 平行因子分析(PARAFAC) 生物可利用性 |
| 英文关键词 Reservoir Changtan Lake Taihu Lake Hongze Lake Gaoyou chromophoric dissolved organic matter (CDOM) parallel factor analysis (PARAFAC) bioavailability |
| 作者 | 单位 | E-mail | | 陈丽丽 | 湖南师范大学地理科学学院, 长沙 410081
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 | 877494639@qq.com | | 肖启涛 | 中国科学院南京地理与湖泊研究所, 流域地理学重点实验室, 南京 210008 | | | 俞晓琴 | 湖南师范大学地理科学学院, 长沙 410081
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 | | | 陈慧敏 | 湖南师范大学地理科学学院, 长沙 410081
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 | | | 韩龙飞 | 湖南师范大学地理科学学院, 长沙 410081 | hanlf@hunnu.edu.cn |
|
| 中文摘要 |
| 近几十年来，我国东部平原和丘陵区城市化快速发展，大量的工农业废水和生活污水被排入湖库，直接影响湖库水质和水生生态系统安全.作为特大及大中型城市集中型供水水源地，湖库有色可溶性有机物（CDOM）来源组成极大程度影响着供水安全和城市居民生命健康.通过2021年4月采集长潭水库（11个）、太湖（25个）、洪泽湖（18个）和高邮湖（14个）共68个样品，运用三维荧光光谱结合平行因子分析法（EEMs-PARAFAC）和室内生物培养实验对水体CDOM组成来源和生物可利用性特征进行分析.结果表明，4个湖库溶解性有机碳（DOC）经28 d生物培养后其生物可利用性ω（BDOC）均可达50%以上.PARAFAC分析得到4个荧光组分，分别是由农业活动作用的类腐殖酸C1、类色氨酸C2、类酪氨酸C3和C4，其中类蛋白质组分（C2+C3+C4）贡献率在洪泽湖可达（90.0±2.2）%.洪泽湖荧光组分C1~C3均与TP存在显著相关关系，因而C1~C3可用于预测洪泽湖TP变化情况.4个湖库CDOM的吸收系数a254与DOC呈极显著正相关关系（R2=0.96，P<0.01），因而上述湖库可以利用a254反演DOC浓度.太湖腐殖化指数HIX较低，生物作用鲜活指数BIX较高，CDOM组成以内源自生作用为主，而其他湖库外源输入信号强烈.增强4个湖库周边地区工农业废水和生活污水的排放监控，合理规划农业、旅游业和城镇建设，能有效保护湖库水质和水生态环境安全与健康. |
| 英文摘要 |
| Intensified urbanization has been occurring in the eastern region of China in recent decades, and excessive industrial and household sewage has been discharged into lakes and reservoirs, which has directly lowered water quality and destructed the functions of aquatic ecosystems. Lakes and reservoirs are typically drinking water sources supplying water for metropolitan areas as well as large- and medium-sized cities. Chromophoric dissolved organic matter (CDOM) is the colored fraction of DOM, and its source and optical composition strongly affect water supply safety and the health of surrounding citizens. In April 2021, we collected 68 samples from Reservoir Changtan (n=11), Lake Taihu (n=25), Lake Hongze (n=18), and Lake Gaoyou (n=14), and we further carried out 28 days of laboratory bio-incubation, together with optical measurements and parallel factor analysis (EEMs-PARAFAC) to analyze the bio-degradability ω(BDOC), sources, and optical composition of CDOM in these waters. The results showed that after 28 days of laboratory bio-incubation, the bioavailability of dissolved organic carbon (BDOC) of the four lakes and reservoirs were all higher than 50%. PARAFAC results showed that CDOM collected from the four lakes was composed of four fluorescent components, including a terrestrial humic-like C1, a tryptophan-like C2, and tyrosine-like C3 and C4. Protein-like components (C2, C3, and C4) contributed importantly to the CDOM pool in the four waterbodies, and in Lake Hongze the contribution of C2-C4 was as high as (90.0±2.2)%. In Lake Hongze, total phosphorus (TP) correlated closely with C1-C3, indicating that those components can be used to trace the variability of TP. Among the four waterbodies, a254 was positively correlated with DOC (R2=0.96, P<0.01), indicating that a254 can be used to estimate the dynamics of DOC in these waters. In Lake Taihu, we found a low level of humification index (HIX) and a high level of biological index (BIX), indicating that autochthonous substances contributed importantly to the CDOM pool in this lake. In comparison, allochthonous sources contributed importantly to the CDOM pool in the remaining three waters. The enhanced monitoring of the discharge of industrial and agricultural effluents in the upstream watersheds of the four waters can help to protect the water quality and maintain healthy aquatic ecosystems. |
|
|
|
