Ball A S, Williams M, Vincent D, Robinson J
Department of Biological Sciences, John Tabor Laboratories, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK.
Bioresour Technol. 2001 Apr;77(2):177-81. doi: 10.1016/s0960-8524(00)00148-6.
In recent years, there has been an apparent increase in the occurrence of harmful algal blooms occurring in potable waters. The potential of a simple barley straw extract to inhibit algal growth was assessed. Algal growth in lakewater was inhibited by the addition of barley straw (1% w/v), with the chlorophyll a concentration remaining below the original level (40 micrograms l-1) throughout the experiment. In contrast, in the presence of wheat straw, algal biomass increased, reaching a final chlorophyll a concentration of 1160 micrograms l-1 after 28 days. Analysis of the remaining particulate straw at the end of the experiment showed that the lignin content of barley straw had increased significantly from 10-33% (w/w). Further, a preparation of a simple aqueous extract from the decomposed-barley straw was found to inhibit the cyanobacteria Microcystis sp. and the algal species Scenedesmus, with chlorophyll a levels some 10-fold lower than in untreated flasks. This study shows that a decomposed-barley extract, even in a very dilute concentration (0.005%) was capable of inhibiting the growth of Microcystis sp., a commonly occurring cyanobacterium which produces the toxin microcystin and has been responsible for some of the most serious pernicious algal blooms in the UK.
近年来，饮用水中有害藻华的发生明显增加。对一种简单的大麦秸秆提取物抑制藻类生长的潜力进行了评估。添加大麦秸秆（1% w/v）可抑制湖水中藻类的生长，在整个实验过程中叶绿素a浓度保持在原始水平（40微克/升）以下。相比之下，在小麦秸秆存在的情况下，藻类生物量增加，28天后叶绿素a最终浓度达到1160微克/升。实验结束时对剩余颗粒状秸秆的分析表明，大麦秸秆的木质素含量从10%-33%（w/w）显著增加。此外，发现从分解后的大麦秸秆中制备的一种简单水提取物能够抑制蓝藻微囊藻属和绿藻栅藻属，叶绿素a水平比未处理的烧瓶低约10倍。这项研究表明，即使是非常稀浓度（0.005%）的分解大麦提取物也能够抑制微囊藻属的生长，微囊藻属是一种常见的蓝藻，会产生毒素微囊藻毒素，并且是英国一些最严重的有害藻华的罪魁祸首。
