| 过氧化钙对武汉东湖浮游植物群落及水环境的影响 |
| Effects of Calcium Peroxide on the Phytoplankton Community and Water Quality of Donghu Lake, Wuhan |
| 投稿时间：2021-05-06 修订日期：2022-11-19 |
| DOI：10.15928/j.1674-3075.202105060134 |
| 中文关键词:浮游植物 过氧化钙 水环境 武汉东湖 |
| 英文关键词:phytoplankton calcium peroxide water environment Donghu Lake |
| 基金项目:国家十三五水专项（No2017zx07108-001） |
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| 中文摘要: |
| 蓝藻等浮游植物的过量繁殖会严重污染水质，常常需要借助化学手段进行处置；过氧化钙是一种对环境友好且具有高效性的强氧化剂，能在水中缓慢释放过氧化氢。为探讨过氧化钙作为化学除藻剂对浮游植物群落和水质的影响，2020年10月采集武汉东湖原水，利用特制装置，模拟深度为2 m的水柱中使用不同剂量的过氧化钙进行处理。通过I3-法测定释放的过氧化氢含量，利用磷钼蓝-抗坏血酸法和丙酮萃取法来分别测定水柱中正磷酸盐以及叶绿素a含量，对不同处理的原水进行浮游植物群落鉴定。结果显示，40 mg/L、60 mg/L和80 mg/L的过氧化钙在东湖原水中释放的过氧化氢最高浓度分别为(17.04±0.82) mg/L、(22.21±0.81) mg/L和(31.67±2.47) mg/L；0~1.0 m水层的过氧化氢含量高于1.0~2.0 m水层，持续释放时间可达36~48 h。过氧化钙能显著减少底层水体的正磷酸盐含量，还可显著降低水柱中叶绿素a含量和蓝藻的相对丰度（P<0.05），提高绿藻和硅藻的相对丰度，改变浮游植物群落的物种优势度，具有选择性杀灭蓝藻的效果，在改善水生态系统方面能有效缓解水体磷含量，调整浮游植物群落结构并相对减少蓝藻生物量。本研究可为过氧化钙在蓝藻水华处置、水体富营养化治理等方面提供参考。 |
| 英文摘要: |
| Overgrowth of phytoplankton, particularly cyanobacteria, seriously impairs water quality and is frequently removed with chemicals. Calcium peroxide is an environment friendly and highly effective strong oxidant that slowly releases hydrogen peroxide to water. Although calcium peroxide is widely used for substrate improvement and oxygenating aquaculture ponds, little research has been conducted on its effects on water quality and phytoplankton. In this study, we investigated the effects of calcium peroxide on the phytoplankton community and water quality of Donghu Lake, Wuhan, aiming to provide guidance for the application of calcium peroxide for treating cyanobacteria blooms and managing eutrophication. Water was collected from Donghu Lake on October 27, 2020 and placed in 2.0 m cylindrical containers, with three calcium peroxide treatments (40, 60, 80 mg/L) and a control group. Twenty-four hours before and after treatment, water samples from each treatment were collected for quantitative and qualitative determination of phytoplankton and water quality parameters. The hydrogen peroxide concentration was determined by the I3- method, orthophosphate by the phosphomolybdenum blue-ascorbic acid method and chlorophyll-a by the acetone extraction method. The highest concentrations of hydrogen peroxide released in the calcium peroxide treatments (40 mg/L, 60 mg/L and 80 mg/L) were, respectively, (17.04±0.82) mg/L, (22.21±0.81) mg/L and (31.67±2.47) mg/L. Release of hydrogen peroxide lasted 36-48 h in all calcium peroxide treatments, and the hydrogen peroxide content at a water depth of 0-1.0 m was higher than at 1.0-2.0 m. Calcium peroxide significantly reduced the orthophosphate content of bottom water as well as the chlorophyll-a concentration and the relative abundance of cyanobacteria in all treatments (P<0.05). The relative abundances of chlorophyta and diatoms increased, consequently altering the dominant phytoplankton species. Calcium peroxide effectively improves water quality by reducing phosphorus, restructuring the phytoplankton community and reducing the biomass of cyanobacteria. |
| 张羽珩,李 波,宋高飞,邱昌恩,毕永红.2022.过氧化钙对武汉东湖浮游植物群落及水环境的影响[J].水生态学杂志,43(6):35-42. |
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