College of Life and Environmental Sciences, Wenzhou University, Chashan Academic Town, Ouhai, Wenzhou, 325035, Zhejiang, China.
National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China.
Sci Rep. 2022 Jan 31;12(1):1605. doi: 10.1038/s41598-022-05506-2.
To understand the potential roles of terrestrial bamboo on controlling cyanobacterial blooms in aquatic systems, growth rates of the cyanobacterium Microcystis aeruginosa and its competitor algae were examined under different concentrations of bamboo extract. In mono-species cultures with unicellular algal strains, 5.0 g L extract treatment suppressed M. aeruginosa growth, while it had little effect on the growth of green alga Scenedesmus obliquus or promoted the growth of diatom Nitzschia palea. In co-species cultures, the extract treatment increased the effect of S. obliquus and N. palea on the growth of M. aeruginosa. Under the extract treatment with a field-collected M. aeruginosa population, its cell density declined and its colony was etiolated and sank, while co-cultured N. palea increased explosively by invading the colony. These results suggest that bamboo forest stands along banks and artificially installed bamboo poles can affect the aquatic environment for phytoplankton community. Enhancing the growth of competitors, especially diatoms that can invade cyanobacterial colonies, by using extracts or by providing substrates for growth, was suggested to be the major way of the bloom control by bamboo.
为了了解陆生竹子在控制水生系统中蓝藻水华方面的潜在作用，研究了不同浓度竹子提取物对铜绿微囊藻和其竞争藻类生长速度的影响。在单细胞藻类菌株的单种培养中，5.0 g/L 的提取物处理抑制了铜绿微囊藻的生长，而对绿藻斜生栅藻或促进硅藻新月菱形藻的生长几乎没有影响。在混种培养中，提取物处理增加了斜生栅藻和新月菱形藻对铜绿微囊藻生长的影响。在野外采集的铜绿微囊藻种群的提取物处理下，其细胞密度下降，菌落白化并下沉，而共培养的新月菱形藻通过入侵菌落而急剧增加。这些结果表明，沿河岸的竹林和人工安装的竹杆可以影响浮游植物群落的水生环境。通过使用提取物或提供生长基质来增强竞争藻类（特别是可以入侵蓝藻菌落的硅藻）的生长，被认为是竹子控制水华的主要方式。
