Recent advances in research on algae inhibition by using low-cost straw proposed a possible mechanism that reactive oxygen species (ROS) generated by the solar irradiation of straw-derived dissolved organic matter (DOM) might contribute to cyanobacteria inhibition. However, this process is not clearly understood. Here, DOM from three types of straw (barley, rice, and wheat) and natural organic matter (NOM) isolates were investigated in terms of their photochemical properties and ROS generating abilities. Results demonstrated that the DOM derived from the aeration decomposition of barley straw (A-DOMbs) yielded the best formation efficiencies of hydrogen peroxide (H₂O₂) and hydroxyl radicals (•OH) under solar-simulated irradiation in all organic matter samples. Correlation analysis implies that optical parameters and phenolic hydroxyl group contents can signify ROS generating abilities of different DOM solutions. Bioassay results show that A-DOMbs possesses the highest inhibition performance for M. aeruginosa in all DOM samples, much higher than those of NOM isolates. The addition of catalase greatly relieves the inhibition performance, making the loss of chlorophyll a content decreased from 37.14% to 7.83% in 2 h for A-DOMbs, which implies that for cyanobacteria growth inhibition, photochemically-produced H₂O₂ from SOM is far more important than singlet oxygen (¹O₂), •OH, and even SOM itself. Our results show that H₂O₂ photochemically generated from straw-derived DOM is able to result in rapid inhibition of M. aeruginosa in a relatively short period, furthering the understanding of complicated mechanisms of cyanobacteria inhibition by using low-cost straw in eutrophic waters.

利用低成本秸秆抑制藻类的研究的最新进展提出了一种可能的机制，即太阳光照射秸秆衍生的可溶性有机物（DOM）产生的活性氧（ROS）可能有助于抑制蓝细菌。但是，此过程尚不清楚。在这里，对三种类型的稻草（大麦，水稻和小麦）和天然有机物（NOM）分离物的DOM进行了光化学性质和ROS产生能力的研究。结果表明，大麦秸秆曝气分解产生的DOM（A-DOMbs）产生最佳的过氧化氢（H ₂ O ₂）形成效率。）和所有有机物质样品在太阳模拟辐射下的羟基自由基（•OH）。相关分析表明，光学参数和酚羟基含量可以表示不同DOM溶液的ROS生成能力。生物测定结果表明，在所有DOM样品中，A-DOMbs对铜绿假单胞菌具有最高的抑制性能，远高于NOM分离株。过氧化氢酶的添加极大地减轻了抑制性能，使A-DOMbs在2 h内叶绿素a的损失从37.14％降低到7.83％，这意味着对于蓝藻的生长抑制，SOM产生的光化学生成的H ₂ O ₂为比单线态氧（¹ O₂），•OH甚至SOM本身。我们的结果表明，由稻草衍生的DOM光化学生成的H ₂ O ₂能够在相对较短的时间内快速抑制铜绿假单胞菌，从而进一步了解了在富营养化水中使用低成本稻草抑制蓝藻细菌的复杂机制的认识。 。