| 乌溪江水库富营养化程度及其影响因子时空分布探讨 |
| Temporal and Spatial Distribution of Eutrophication and Influencing Factors in Wuxijiang Reservoir |
| 投稿时间：2022-03-03 修订日期：2022-04-22 |
| DOI：10.15928/j.1674-3075.202203030056 |
| 中文关键词:富营养化 理化因子 叶绿素a 时空分布 乌溪江 |
| 英文关键词:eutrophication physicochemical parameters chlorophyll-a temporal and spatial distribution Wuxijiang reservoir |
| 基金项目:国家重点研发计划项目（2019YFD0900605）；丽水市紧水滩、乌溪江、千峡湖三大水库洁水渔业研究项目（浙大采招2019 341号） |
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| 中文摘要: |
| 为了解乌溪江水库主要水质指标的时空分布特征，探究其营养化程度的变化趋势，2019―2020年，对丽水市乌溪江水库的7个采样点（S1~S7）的水温（WD）、pH、总氮（TN）、总磷（TP）、叶绿素a（Chl-a）等理化因子进行了监测。分析对比综合营养指数和理化因子等关键指标在不同时期的分布特征，结果显示，乌溪江水库的营养盐浓度呈现春夏高秋冬低、从上游（S1）至下游（S7）逐渐下降的趋势，平均综合营养指数从47.1（S1）下降到32.5（S7），整体上属于中营养化水库。TP浓度在0.002~0.040 mg/L，平均值为0.012 mg/L；TN浓度在0.412~2.826 mg/L，氮的主要赋存形式为硝酸盐。Chl-a含量均值为3.77 μg/L，河流区的Chl-a含量显著高于下游的过渡区和湖泊区。分析表明：汛期地表径流带来的富营养化压力最大，同时也是氮磷等外源性营养盐输入水体的主要途径；WD、pH、TP和Chl-a含量中等程度相关，水库生态系统具备很强的净化能力，但近年来富营养化程度加剧。研究结果为改善乌溪江水库水质、维护其生态系统提供了数据参考和理论依据。 |
| 英文摘要: |
| In this study, we analyzed the spatial and temporal distribution of primary water quality indicators and the changes in trophic status in Wuxijiang reservoir of Lishui City, and then compared the comprehensive nutritional index and physicochemical factors of different periods. During 2019 and 2020, five water quality parameters [water temperature (WT), pH, total nitrogen (TN), total phosphorus (TP), and chlorophyll-a (Chl-a)] were monitored monthly at seven sampling sites (S1: riverine; S2-4: transition zone; S5-7: lake) in Wuxijiang reservoir. Results show that nutrient concentrations in the reservoir were higher in spring and summer, and lower in autumn and winter, and tended to decrease from upstream (S1) to downstream (S7). The average comprehensive nutrient index decreased gradually from 47.1 (S1) to 32.5 (S7), indicating an overall mesotrophic state. The TP range was 0.002-0.040 mg/L (mean = 0.012 mg/L) and the TN range was 0.412-2.826 mg/L, occurring primarily as nitrate. The mean Chl-a concentration was 3.77 μg/L, and it was significantly higher in the river than downstream in the transition zone and lake. Pearson correlation analysis shows that surface runoff associated with precipitation had the strongest influence on eutrophication, and was the primary source of exogenous nitrogen and phosphorus. The WT, pH and TP were moderately correlated with Chl-a concentration. While the reservoir has a strong purification ability, eutrophication in Wuxijiang reservoir has intensified in recent years. Our study provides a reference and scientific data to support water quality improvement and ecosystem conservation in Wuxijiang reservoir. |
| 李其轩,张真,徐梦娇,刘珂珂,葛航,姚子亮,刘其根.2024.乌溪江水库富营养化程度及其影响因子时空分布探讨[J].水生态学杂志,45(2):31-38. |
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