李如忠,何瑞亮,刘超,林保国,许大强.水库泄洪闸下溪流深潭氮磷营养盐滞留特征及动力学模拟[J].环境科学学报,2021,41(11):4606-4614
水库泄洪闸下溪流深潭氮磷营养盐滞留特征及动力学模拟
- Retention characteristics and kinetics simulation of nitrogen and phosphorus in a stream pool under the sluice gate of a small reservoir
- 基金项目：国家自然科学基金项目（No.51579061）；安徽省重点研究与开发计划项目（No.202004i07020005）
- 李如忠
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 何瑞亮
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 刘超
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 林保国
- 安徽皖欣环境科技有限公司, 合肥 230601
- 许大强
- 安徽皖欣环境科技有限公司, 合肥 230601
- 摘要：为解析水库泄洪闸下溪流深潭氮磷营养盐滞留特征，选择NaBr为保守示踪剂，分别以NH4Cl和KH2PO4为添加营养盐，在合肥板桥河源头溪流开展野外示踪实验，据此估算氨氮（NH4+）、磷酸盐（PO43-）营养螺旋指标，识别主流区和暂态存储区NH4+、PO43-滞留贡献水平，模拟深潭地貌的氮磷吸收动力学特征.结果表明，深潭具有较好的氮磷滞留潜力，且对PO43-的滞留潜力超过NH4+；暂态存储区对NH4+的滞留贡献率平均为91.49%，表明NH4+滞留主要发生在暂态存储区；主流区对PO43-的滞留贡献率平均为96.09%，意味着主流区是PO43-滞留的主要场所；Michaelis-Menten（M-M）方程可以较好的模拟深潭氮磷滞留动力学效应，模拟得到的最大吸收速率Umax-NH4、Umax-PO4均值分别为0.48、0.08 mg·m-2·s-1，半饱和常数Km-NH4、Km-PO4均值分别为0.26、0.19 mg·L-1.
- Abstract：To investigate the retention characteristics of nitrogen and phosphorus in natural deep pool geomorphic pattern of streams, several field tracer experiments by taking NH4Cl and KH2PO4 as nutrient additions, and NaBr as a conservative tracer were performed in the headwater stream of Banqiao River, Hefei district. The nitrogen and phosphorus spiraling metrics were measured, and the contribution of main channel and transient storage zone to NH4+ and PO43- retention were estimated, respectively. Moreover, dynamics simulation for nitrogen and phosphorus retention was conducted as well. Results showed that the deep pool had a good potential for nitrogen and phosphorus retention, and retention potential for PO43- was higher than that of NH4+. NH4+ retention in transient storage zone was taken up to 91.49%, indicating that NH4+ retention mainly occurred in the transient storage zone. PO43- retention in main channel zone was up to 96.09%. In addition, Michaelis-Menten (M-M) equation could well simulate the dynamics of NH4+ and PO43- retention in the deep pool. The mean maximum uptake rates of Umax-NH4 and Umax-PO4 obtained from the M-M equation were 0.48 and 0.08 mg·m-2·s-1, respectively. And the half-saturation constants Km-NH4 and Km-PO4 were 0.26 and 0.19 mg·L-1, respectively.
