| 杨震,张会强,陈静,赵荣娜,张淳,张秦铭,殷宪强,范晓腾.不同氮磷比对北洛河中藻类生长的影响[J].农业环境科学学报,2023,42(9):2069-2076. |
| 不同氮磷比对北洛河中藻类生长的影响 |
| Effects of nitrogen/phosphorus ratios on algae growth in the Beiluo River |
| 投稿时间：2022-12-01 修订日期：2023-02-16 |
| DOI：10.11654/jaes.2022-1236 |
| 中文关键词: 北洛河 氮磷比 水体富营养化 藻类 |
| 英文关键词: Beiluo River nitrogen/phosphorus ratio eutrophication algae |
| 基金项目:国家自然科学基金面上项目（41877018） |
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| 中文摘要: |
| 为探究不同氮磷比条件下北洛河中藻类的生长情况与多样性变化，本研究于北洛河下桃水电站坝上水库采集水样，通过添加磷酸盐提高水体中总磷浓度、调整氮磷比，根据总磷浓度（0.02、0.05、0.10、0.15、0.20、0.25、0.30、0.35、0.40、0.45、0.50 mg·L-1）共设置11个处理组，进行5 d的藻类培养实验。结果表明：不同培养体系中共鉴定出藻类4门31属，其中蓝藻门的微囊藻属、平裂藻属和绿藻门的栅藻属、十字藻属、惠氏藻属的占比相对较高，为北洛河中的优势种属；藻类细胞丰度随着总磷浓度升高先逐渐上升，并在0.40 mg·L-1组达到最高；当总磷浓度≥0.10 mg·L-1时，优势藻类开始暴发性生长，导致物种丰富度指数显著升高（P<0.05），而Shannon多样性指数、Simpson优势度指数、Pielou均匀度指数显著下降（P<0.05）。通过对水样中氮磷浓度进行测定发现，随着外源磷输入量的增加，藻类对总氮的吸收加快；当总磷浓度高于0.10 mg·L-1时，可明显促进藻类对总氮的吸收，吸收氮磷比趋于平稳。综上所述，本研究初步发现外源磷的输入可促进北洛河中藻类对总氮的吸收，总磷浓度≥0.10 mg·L-1可明显引起蓝藻门和绿藻门等优势藻类暴发性生长，存在水华发生的风险。 |
| 英文摘要: |
| This study collected water samples from the Xiatao Hydropower Station dam, Beiluo River, and added phosphate to elevate the total phosphorus concentration and modify the nitrogen/phosphorus ratios to explore the algae growth and diversity in Beiluo River under different nitrogen/phosphorus ratios. In total, 11 groups with varying total phosphorus concentrations(0.02, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50 mg·L-1)were set up for 5-day cultures. Results showed that the identified algae belonged to 31 genera and 4 phyla in the culture conditions, among which Microcystis, Merismopedia of the phylum Cyanobacteria, and Scenedesmus, Crucigenia, and Placoma of the phylum Chlorophyta were the dominant species that accounted for a relatively high proportion of algae in the Beiluo River. The algal abundance gradually increased with the total phosphorus concentrations, and the highest was in the 0.40 mg·L-1 group. The dominant algae grew rapidly when the total phosphorus concentration was higher than 0.10 mg·L-1, resulting in a significant increase in the species richness index(P<0.05)and significant decreases in the Shannon diversity index, Simpson dominance index, and Pielou evenness index(P<0.05). Besides, the determination of nitrogen and phosphorus in water samples showed that the absorption of total nitrogen by algae was accelerated with the increased input of exogenous phosphorus concentrations. The total nitrogen uptake was accelerated, and the nitrogen/phosphorus uptake ratios tended to plateau when the total phosphorus concentration exceeded 0.10 mg·L-1. In summary, the present study found that the input of phosphorus could promote the absorption rate of total nitrogen by algae, increasing the risks of rapid growth and algal blooms of the Cyanobacteria and Chlorophyta phyla when the concentration of total phosphorus ≥ 0.10 mg·L-1. |
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