| 引用本文: | 李昂松,武闯,朱琳,徐丽桦,张劲,李兆华,蔡伟,冯学高.菹草腐解期上覆水浮游细菌群落动态模拟及其环境驱动因子分析.湖泊科学,2024,36(2):389-402. DOI:10.18307/2024.0215 |
| Li Angsong,Wu Chuang,Zhu Lin,Xu Lihua,Zhang Jin,Li Zhaohua,Cai Wei,Feng Xuegao.Simulation of bacterioplankton community dynamics and their environmental driving factors in overlying water during Potamogeton crispus decomposition. J. Lake Sci.2024,36(2):389-402. DOI:10.18307/2024.0215 |
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| 菹草腐解期上覆水浮游细菌群落动态模拟及其环境驱动因子分析 |
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李昂松1,2, 武闯3, 朱琳1, 徐丽桦1, 张劲1,2, 李兆华1,2, 蔡伟1,2, 冯学高4
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1.湖北大学资源环境学院, 武汉 430062;2.湖北大学生态文明建设研究院, 武汉 430062;3.武汉市生态环境安全中心, 武汉 430062;4.荆门市生态环境局沙洋县分局, 荆门 448299
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| 摘要: |
| 菹草生长期内可以从水体中吸收大量的营养物质,有效抑制水体富营养化。但在季节交替期,菹草衰亡后,其残体腐解会向上覆水释放大量营养物质,对湖泊生态系统造成瞬时冲击。通过实验室模拟,将菹草分别浸泡在不同稀释比的上覆水中自然腐解,旨在研究菹草残体腐解过程上覆水水质变化及环境因子对浮游细菌的驱动作用。结果表明:(1)在稀释组(B、C组)中,菹草腐解的氮素均出现了短期冲击(第1天),冲击程度与稀释比呈正相关。(2)上覆水水质越好,浮游细菌共有OTUs(operational taxonomic units,操作分类单元)数量占比越高,且浮游菌群结构受氮素冲击的变化越剧烈。实验第30天时,稀释湖水4倍组(C组)共有OTUs占比为61%,高于原水组(A组,OTUs占比40%)和稀释2倍组(B组,OTUs占比45%)。群落结构的剧烈变化主要通过影响厚壁菌门(Firmicutes)、疣微菌门(Verrucomicrobiota)、放线杆菌门(Actinobacteriota)和蓝藻菌门(Cyanobacteria)的相对丰度大小实现。(3)变形杆菌门(Proteobacteria)是整个腐解过程中的第一大优势菌群,A、B、C三组的第一大优势菌门均为变形杆菌门,水质提升有助于厚壁菌门的生长和繁殖,在B组和C组中的第二大优势菌群是厚壁菌门,稀释比越高两类细菌门的总相对丰度越大。(4)总悬浮物、氧化还原电位、浊度和总氮对水体中的细菌群落结构产生显著影响,腐解进程可分为2个时段,环境因子对菌群结构影响的变化与腐解进程有关。因此,相关人员可通过适度收割沉水植物残体,调节水体氮素、浊度等上覆水理化指标,调控水体中细菌的群落结构及优势菌群种类,从而降低季节性水生植物腐解引发的负面影响,最终达到科学管理沉水植物的目的。 |
| 关键词: 菹草腐解 上覆水 氮素 浮游细菌 典范对应分析 网络分析 |
| DOI：10.18307/2024.0215 |
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| 基金项目:湖北省重点研发计划项目(2021BCA129)资助。 |
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| Simulation of bacterioplankton community dynamics and their environmental driving factors in overlying water during Potamogeton crispus decomposition |
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Li Angsong1,2, Wu Chuang3, Zhu Lin1, Xu Lihua1, Zhang Jin1,2, Li Zhaohua1,2, Cai Wei1,2, Feng Xuegao4
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1.Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, P.R. China;2.Research Institute for Ecological Civilization Construction, Hubei University, Wuhan 430062, P.R. China;3.Wuhan Ecological Environment Security Center, Wuhan 430062, P.R. China;4.Shayang County Branch, Jingmen Ecological and Environmental Bureau, Jingmen 448299, P.R. China
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| Abstract: |
| Potamogeton crispus absorbs a large amount of nutrients from the water during its growing period thus can effectively inhibit water eutrophication. However, the decay of Potamogeton crispus when it is dead, its residues will release nutrients to the overlying water, causing instantaneous impact on the lake ecosystem. Through laboratory simulation, Potamogeton crispus was immersed in different concentrations of overlying water for natural decomposition, in order to study the change of overlying water quality during the decomposition of Potamogeton crispus residues and the driving effects of environmental factors on bacterioplankton. Results showed that: (1) In the diluted groups (group B and C), there was a short-term shock (1st day) of nitrogen in the decomposition of Potamogeton crispus and the degree of shock was positively correlated with the dilution ratio. (2) The better quality of the overlying water, the higher the percentage of the common OTUs (operational taxonomic units) of bacterioplankton, and the more drastic change of the structure of the bacterioplankton population by the nitrogen shock. On the 30th day of the experiment, the proportion of mutual OTUs in the 4-fold diluted group (group C) was 61%, which was higher than that in the raw water group (group A, OTUs accounted for 40%) and the 2-fold diluted lake water group (group B, OTUs accounted for 45%). The dramatic changes in community structure were mainly achieved by affecting the relative abundance size of Firmicutes, Verrucomicrobiota, Actinobacteriota and Cyanobacteria. (3) Proteobacteria was the first dominant group in the whole decomposition process and in all three groups. Water quality enhancement helped the growth and reproduction of Firmicutes. The second dominant group in groups B and C was Firmicutes, the higher the dilution ratio, the greater the total relative abundance of the two phylums of bacteria. (4) Total suspended solids, oxidation-reduction potential, turbidity and total nitrogen had major effects on the structure of bacterium communities. The decomposition process could be divided into 2 stages, and the changes of environmental factors on bacterial community structure were related to the decomposition process. Hence, by strategically harvesting the residues of submerged plants and adjusting the overlying water's physicochemical parameters such as nitrogen and turbidity, relevant authorities can mitigate the negative repercussions caused by seasonal aquatic plant decomposition, thereby accomplishing the ultimate objective of scientifically managing submerged plants. |
| Key words: Decomposed Potamogeton crispus overlying water nitrogen bacterioplankton canonical correspondence analysis network analysis |
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