Impact of exogenous nitrogen on the cyanobacterial abundance and community in oil-contaminated sediment: A microcosm study
Impact of exogenous nitrogen on the cyanobacterial abundance and community in oil-contaminated sediment: A microcosm study
复制标题
外源氮对石油污染沉积物中蓝藻丰度和群落的影响：微观研究
DOI：
10.1016/j.scitotenv.2019.136296
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发表时间：
2020-03-25
影响因子：
9.8
通讯作者：
Lu，Zhenmei
中科院分区：
文献类型：
--
作者：
Wang，Haixia;Li，Hanbo;Lu，Zhenmei
石油泄漏造成的污染是一个全球性的问题，石油污染地区蓝藻的爆发对海洋中的浮游生物有害。海洋是一个贫瘠的环境，氮和其他营养盐的低可用性限制，和进一步的氮限制所造成的石油污染被认为是导致蓝藻爆发的重要因素之一，但在这种情况下的氮修正的影响还没有得到很好的理解。在这里，我们提出了在石油污染的微观世界中进行的氮修正实验的结果。在不同时间点，每个处理组的沉积物表面上出现绿色垫。与未加氮组相比，加氮组蓝藻水华的出现时间明显延迟。此外，石油促进固氮和刺激生长的固氮蓝藻在石油污染的缩影。我们的研究结果表明，氮的限制是一个重要的因素，诱导蓝藻水华在石油污染的环境中，氮的加入减少了蓝藻的丰度高达约2.5倍，并减缓了水华的过程。
The pollution caused by oil spills is a global problem, and outbreaks of blue algae in oil-polluted areas are harmful to plankton in the ocean. The ocean is a barren environment limited by low availabilities of nitrogen and other nutrients, and further nitrogen limitation caused by oil contamination is considered one of the important factors leading to outbreaks of cyanobacteria, but the effects of nitrogen amendment in this situation are not well understood. Here, we present the results from nitrogen amendment experiments conducted in oil-contaminated microcosms. Green mats appeared on the sediment surface of each treatment group at different time points. The appearance of cyanobacterial blooms in the oil-contaminated group supplemented with nitrogen was significantly delayed compared with that in the oil-contaminated group without nitrogen addition. Moreover, oil promoted nitrogen fixation and stimulated the growth of nitrogen-fixing cyanobacteria in the oil-contaminated microcosms. Our results suggest that nitrogen limitation is a vital factor for the induction of cyanobacterial blooms in oil-contaminated environments, and the addition of nitrogen reduced the abundance of cyanobacteria by up to approximately 2.5-fold and slowed the bloom process.