Spatiotemporal Changes of Cyanobacterial Bloom in Large Shallow Eutrophic Lake Taihu, China.
Spatiotemporal Changes of Cyanobacterial Bloom in Large Shallow Eutrophic Lake Taihu, China.
复制标题
太湖大型浅水富营养化蓝藻水华时空变化
DOI：
10.3389/fmicb.2018.00451
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发表时间：
2018
影响因子：
5.2
通讯作者：
Zhou J
中科院分区：
文献类型：
--
作者：
Qin B;Yang G;Ma J;Wu T;Li W;Liu L;Deng J;Zhou J
太湖是一个大的浅层富营养化湖泊，蓝藻水华频繁发生，在空间和时间上具有高度的可变分布。通过对蓝藻华发生情况的野外观测和遥感监测，结合室内混合效应对大菌落形成的控制实验和菌落向上移动速度的测量，发现轻微或中度的风致扰动会增大菌落的大小，使其在扰动后更容易克服混合并快速浮向水面。风对蓝藻菌落扩大的影响机制与细胞外多糖（EPS）的存在有关，EPS增加了蓝藻菌落的大小和浮力，促进了菌落在水面聚集形成水华。蓝藻菌落的垂直运动和水平迁移均受风诱导流体力学的控制。由于风和水流的高度变化，加上蓝藻的大量菌落形成，使得水华的发生在空间和时间上具有高度的可变性。这一物理因素决定蓝藻华形成的大浅湖不同于以前记录的光介导的华形成动力学。
Lake Taihu is a large shallow eutrophic lake with frequent recurrence of cyanobacterial bloom which has high variable distribution in space and time. Based on the field observations and remote sensing monitoring of cyanobacterial bloom occurrence, in conjunction with laboratory controlled experiments of mixing effects on large colony formation and colonies upward moving velocity measurements, it is found that the small or moderate wind-induced disturbance would increase the colonies size and enable it more easily to overcome the mixing and float to water surface rapidly during post-disturbance. The proposed mechanism of wind induced mixing on cyanobacterial colony enlargement is associated with the presence of the extracellular polysaccharide (EPS) which increased the size and buoyancy of cyanobacteria colonies and promote the colonies aggregate at the water surface to form bloom. Both the vertical movement and horizontal migration of cyanobacterial colonies were controlled by the wind induced hydrodynamics. Because of the high variation of wind and current coupling with the large cyanobacterial colony formation make the bloom occurrence as highly mutable in space and time. This physical factor determining cyanobacterial bloom formation in the large shallow lake differ from the previously documented light-mediated bloom formation dynamics.
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