小微河流周丛生物膜氮磷滞留特征及影响因素

为揭示小微河流周丛生物膜氮磷滞留特征，文章采用原位培养观测实验，开展环境背景质量浓度、2倍背景质量浓度和4倍背景质量浓度情形下周丛生物膜的氨氮$\left(\mathrm{NH}_{4}^{+}-\mathrm{N}\right)$ 、硝态氮 $\left(\mathrm{NO}_{3}^{-}-\mathrm{N}\right)$ 和磷酸盐 $\left(\mathrm{PO}_{4}^{3-}-\mathrm{P}\right)$ 吸收效应研究，分析周丛生物膜氮磷吸收速率与环境影响因素的相关关系。研究结果证明了小微河流周丛生物膜氮磷滞留的有效性，定量刻画了周丛生物膜氮磷吸收速率及其对氮磷富集水平的响应效应。相关性分析表明，周丛生物膜氮磷吸收速率与温度、pH值、电导率和水面光照强度存在显著相关关系，随着营养盐富集水平的提高，相关性总体呈现下降趋势。

To reveal the nitrogen and phosphorus retention characteristics of biofilms in small and micro rivers, in situ cultivation observation experiments were conducted to study the absorption effects of ammonia nitrogen$\mathrm{(NH_4^+ - N)}$ , nitrate nitrogen $\mathrm{(NO_3^- - N)}$ , and phosphate $\mathrm{(PO_4^{3-} - P)}$ in biofilms under environmental background concentration, double background concentration, and quadruple background concentration. The correlation between the nitrogen and phosphorus absorption rate of biofilms in small and micro rivers and environmental impact factors was analyzed. The research results proved the effectiveness of biofilm nitrogen and phosphorus retention in small and micro rivers, quantitatively characterized the nitrogen and phosphorus absorption rate of biofilms in small and micro rivers and its response to nitrogen and phosphorus enrichment level. Correlation analysis showed that the nitrogen and phosphorus absorption rate of biofilms in small and micro rivers was significantly correlated with temperature, pH value, electrical conductivity, and solar reflectance index(SRI). However, with the increase of nutrient enrichment level, the correlation generally showed a downward trend.