Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
National Marine Environmental Monitoring Center, Dalian 116023, China.
Mar Pollut Bull. 2021 Jul;168:112424. doi: 10.1016/j.marpolbul.2021.112424. Epub 2021 May 8.
It has been 14 years since the world's largest Ulva bloom appeared in the Yellow Sea, China in 2007. Although it is clear that the Ulva bloom originates from the culture system of Porphyra yezoensis (Nori) in the southern Yellow Sea, how to control it is still little understood. Since overwintering banks played a crucial role in the development of spring population of green algae on the cultivation ropes, here, a promising method was presented to prevent the development of Ulva bloom by the inactivation of the overwintering banks of green algae on the P. yezoensis cultivation ropes during February and early March. Chlorine dioxide, an environment-friendly disinfectant was used as algaecide with dosage of no lower than 40 mg/L at the contact time of 1 min. The overwintering green algae gradually disappeared within two weeks after the treatment. Furthermore, the growth of spring population of green algae on the cultivation ropes was effectively inhibited for at least eight weeks, which contribute to prevent the formation of floating populations during cultivation facilities collection. It was expected that the present method, if to be applied in the P. yezoensis cultivation areas in southern Yellow Sea, may mitigate the magnitude of the Ulva blooms in the Yellow Sea at a lower cost.
自 2007 年中国黄海出现世界上最大规模的浒苔藻华以来，已经过去了 14 年。尽管浒苔藻华显然起源于南黄海紫菜（Nori）养殖系统，但如何控制它仍然知之甚少。由于越冬带在养殖绳上绿藻春季种群的发展中起着至关重要的作用，因此，这里提出了一种有前途的方法，即在 2 月和 3 月初用环境友好型消毒剂二氧化氯作为杀藻剂，用量不低于 40mg/L，接触时间为 1 分钟，来防止紫菜养殖绳上的越冬绿藻的发展。处理后，越冬绿藻在两周内逐渐消失。此外，春季绿藻在养殖绳上的种群生长至少被有效抑制了八周，这有助于防止在收集养殖设施时形成浮种群。如果将该方法应用于南黄海紫菜养殖区，预计可以以较低的成本减轻黄海浒苔藻华的严重程度。
