源头溪流氮磷耦合吸收效应及动力学模拟

合肥城郊的 2 条源头溪流,开展 5 次由单、双营养盐添加构成的示踪试验,利用 TASCC 技术方法,分别以 Michaelis-Menten (M-M)方程和双营养耦合吸
收曲面模型拟合营养盐吸收动力学过程.结果表明,双添加试验的 NO3-N、PO4-P 吸收速率均明显高于单添加情形,意味着溪流中 NO3-N 与 PO4-P 吸收
不同程度的偏差,其中 M-M 方程低估了 Umax-N 和 Umax-P,相应幅度分别达 3.91%~16.11%、3.23%~23.63%.
关键词：源头溪流；氮磷耦合吸收；TASCC；Michaelis-Menten(M-M)方程；响应曲面模型
中图分类号：X522
文献标识码：A
百度文库
文章编号：1000-6923(2019)02-0648-09
Coupling uptake kinetics and mechanism of nitrogen and phosphorus in headwater streams. LI Ru-zhong*, XU Da-qiang, QUE Feng-xiang (School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China). China Environmental Science, 2019,39(2)：648~656 Abstract：Five conservative tracer tests including single nutrient and dual-nutrient injection were conducted to reveal the coupling mechanism of nitrogen and phosphorus uptake in two headwater streams of Ershibu River in the suburb of Hefei, Chaohu Lake Basin, from October 2017 to March 2018. NaCl and NaBr were selected as the conservative tracers; the reactive nutrients were KNO3 and KH2PO4. Based on the TASCC (Tracer Additions for Spiraling Curve Characterization) method, the Michaelis-Menten (M-M) model and the two-substrate M-M response surface model were applied to simulate the kinetics of nutrients uptake. The results showed that the uptake rates of NO3-N and PO4-P in the dual-nutrient injection test were significantly higher than those obtained in the single nutrient injection test, which implied that mutual promotion between NO3-N and PO4-P for nutrient uptake in the two headwater streams. The dual-nutrient uptake response surfaces presented the evolutionary trends of uptake rates at different concentrations and ratios of nitrogen and phosphorus. Additionally, it also explained the interaction mechanism of NO3-N (or PO4-P) uptake rate increasing with the increase of the available PO4-P (or NO3-N) at their low concentration. The fitting results of NO3-N and PO4-P maximum uptake rates (Umax-N and Umax-P) obtained by the two kinetic models presented deviations in a certain degree. The parameters of Umax-N and Umax-P were underestimated by the M-M model ranging from 3.91%~16.11% and 3.23%~23.63%, respectively. Key words：headwater stream；coupling uptake of nitrogen and phosphorus；TASCC；Michaelis-Menten (M-M) model；response surface model
存在相互促进作用;双营养耦合吸收响应曲面直观展示了氮、磷营养盐不同浓度水平及浓度比情形下吸收速率的演化趋势,诠释了较低浓度水平下溪流
NO3-N(或 PO4-P)吸收速率随 PO4-P(或 NO3-N)可利用量增加而增大的作用机制;两种动力学模型在 NO3-N、PO4-P 最大吸收速率拟合结果上均存在
中国环境科学 2019,39(2)：648~656
China Environmental Science
源头溪流氮磷耦合吸收效应及动力学模拟
李如忠*,许大强,阙凤翔 (合肥工业大学资源与环境工程学院,安徽 合肥 230009)
摘要：为揭示源头溪流氮磷耦合吸收作用机制,选择 NaCl 和 NaBr 为保守型示踪剂、KNO3 和 KH2PO4 为添加营养盐,于 2017 年 10 月~2018 年 3 月在