摘要:垂向湍流、温、光等是影响藻类生长和垂向分布的关键因素。基于大型浅水湖泊（太湖）的背景物理场（辐射、水深、水温和消光等），利用藻类生长-扩散模型的敏感性试验，探讨物理过程对浅水湖泊中下沉藻的垂向分布的影响机制。水温是次表层叶绿素峰值（Subsurface Chlorophyll Maxinmum：SCMax）或谷值（Subsurface Chlorophyll Minimum：SCMin）形成的限制性条件；当水温大于阈值时，随深度的增大，过强光能抑制藻类的生长转变为弱光限制藻类的生长是SCMax形成的关键；垂向湍流的裹挟作用是弱化SCMax强度的关键过程。该研究有利于厘清物理过程对藻类群落演替的作用机制，强化对水生态系统的修复效果。



Abstract:Physical processes such as vertical turbulence, temperature, and light are key factors affecting vertical distribution and algae growth. Based on the radiation, water depth, water temperature and water attenuation, sensitivity studies were conducted using algae growth-diffusion model to explore the mechanism of physical processes affecting the vertical distribution of sinking algae. The results showed that the vertical distributions of sinking algae were affected by vertical turbulence, temperature and light. Water temperature was the limiting factor for the generation of the Subsurface Chlorophyll Maxinmum (SCMax) or Subsurface Chlorophyll Minimum (SCMin). When the water temperature was higher than the threshold, with the increase of the depth, the key to the generation of SCMax was that the too much light could inhibit the growth of algae, and the weak light could limit the growth of algae. The entrainment of vertical turbulence was the key process of weakening SCMax intensity. This study favored to clarify the mechanism of cyanobacterial bloom and strengthen the restoration for aquatic ecosystem.





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