| 三峡水库小江回水区水华期间水环境因子对微囊藻丰度的影响 |
| Impact of Environmental Factors on Microcystis Abundance During Algae Blooms in the Xiaojiang Backwater of Three Gorges Reservoir |
| 投稿时间：2017-11-07 修订日期：2018-11-19 |
| DOI：10.15928/j.1674-3075.2018.06.003 |
| 中文关键词:小江回水区 水华 微囊藻 水环境因子 |
| 英文关键词:Xiaojiang backwater algal bloom Microcystis water environmental factors |
| 基金项目:国家重点研发计划重点专项（2017YFC0404705）；国家自然科学基金（51409177） |
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| 中文摘要: |
| 小江是三峡库区北岸流域面积最大的一条支流，其回水区富营养化备受关注。2016年4月下旬至5月，中旬小江回水区高阳断面和双江断面爆发了水华。以高阳断面和双江断面为监测区域，采用冗余分析方法，探究水华爆发期微囊藻丰度与水环境因子的关系，以期找出水华应急阶段关键水环境因子，为小江回水区微囊藻水华预警监测和防控提供科学依据。结果表明，随着水深逐渐增加，微囊藻的丰度逐渐减少，高阳断面上表层（水下0.5 m）、中层（1/2水深）、底层（底部以上0.5 m）微囊藻丰度为2467.67×104个/L、792.58×104 个/L和729.72×104 个/L；双江断面表、中、底层分别为1337.57×104个/L、298.75×104个/L和108.79×104个/L；高阳断面微囊藻丰度明显高于双江断面。高阳断面的水温、溶解氧和高锰酸盐指数明显高于双江断面，其他水环境指标的差异性不显著。冗余分析Monte Carlo检验结果显示，高阳断面溶解氧（P=0.045）与微囊藻丰度呈显著正相关，电导率（P=0.047）与微囊藻丰度呈显著负相关，双江断面水温（P=0.002）与微囊藻丰度呈极显著正相关，透明度与微囊藻丰度呈显著负相关（P=0.011）。 |
| 英文摘要: |
| Xiaojiang River is one of the largest tributaries to the north basin of Three Gorges Reservoir. Eutrophication and frequent algae blooms in the backwater of Xiaojiang River have intensified and attracted increasing attention. From late April to mid-May of 2016, an algae bloom occurred in the Gaoyang and Shuangjiang sections of Xiaojiang River and intensive monitoring of water quality and Microcystis abundance was carried out during the bloom. Monitoring of water quality was also conducted before (February to March) and after (June to July) the algae bloom. Differences in the water quality parameters before and after the algal bloom, and the relationship between environmental factors and Microcystis abundance were analyzed using redundancy analysis. The objective was to identify the primary environmental factors affecting Microcystis abundance and provide a scientific basis for controlling Microcystis blooms. There were large differences in water quality parameters before and after the algal bloom in both the Gaoyang and Shuangjiang sections, particularly in conductivity and dissolved oxygen (DO). During the bloom, conductivity was significantly higher and DO was significantly lower than before or after the bloom. Microcystis abundance decreased with depth. In the Gaoyang section, the average abundance of Microcystis was 2467.67×104 cells/L at the surface (0.5 m below the surface), 792.58×104 cells/L in the middle (1/2 water depth) and 729.72×104 cells/L at the bottom (0.5 m above the bottom). In the Shuangjiang section, the average abundances at the surface, middle and bottom layers were, respectively, 1337.57×104 cells/L, 298.75×104 cells/L, 108.79×104 cells/L. Microcystis abundance in the Gaoyang backwater was significantly higher than in the Shuangjiang backwater. Water temperature, DO and the permanganate index were also significantly higher in Gaoyang section while differences in the other environmental factors were not significant between the two sections. Redundancy analysis combined with the Monte Carlo permutation test showed, in the Gaoyang section, a significant positive correlation between Microcystis abundance and DO (P=0.045) and a significant negative correlation with conductivity (P=0.047). In the Shuangjiang section, Microcystis abundance was positively correlated with water temperature (P=0.002) and negatively correlated with water transparency (P=0.011). No significant correlations were found between Microcystis abundance and nutrients, such as nitrogen and phosphorus, or pH. This does not prove that these factors are not important as the lack of correlation may be due to study circumstances, such as an insufficient study period or limited sampling. A better understanding of the relationship of Microcystis abundance with water quality and hydrodynamics will require continued research. |
| 袁玉洁,朱梦灵,万成炎,徐德毅,彭建华,邹曦.2018.三峡水库小江回水区水华期间水环境因子对微囊藻丰度的影响[J].水生态学杂志,39(6):16-22. |
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