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New insights into eutrophication management:Importance of temperature and water residence time

Journal of Environmental Sciences 2022年第1期34卷 229-239页

作者： Feng Zhao Xu Zhan Hai Xu Guangwei Zhu Wei Zou Mengyuan Zhu Lijuan Kang Yulong Guo Xingchen Zhao Zicong Wang Wei Tang State Key Laboratory of lake and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China School of Environmental and Civil Engineering Jiangnan UniversityWuxi 214122China

Eutrophication and harmful cyanobacterial blooms threaten water resources all over the *** is a great controversy about controlling only phosphorus or controlling both nitrogen and phosphorus in the management of lake *** primary argument against the dual nutrients control of eutrophication is that nitrogen fixation can compensate the nitrogen ***,it is of great necessary to study the factors that can significantly affect the nitrogen *** to the difference of climate and human influence,the water quality of different lakes(such as water temperature,N:P ratio and water residence time)is also quite *** studies have reported that the low N:P ratio can intensify the nitrogen fixation ***,the effects of temperature and water residence time on the nitrogen fixation remain ***,30 shallows freshwater lakes in the eastern plain of China were selected to measure dissolved N_(2) and Ar concentrations through N_(2):Ar method using a membrane inlet mass spectrometer to quantify the nitrogen fixation capacities and investigate whether the temperature and water residence time have a great impact on nitrogen *** results have shown that the short lake water residence time can severely inhibit the nitrogen fixation capacities through inhibiting the growth of nitrogenfixing cyanobacteria,changing the N:P ratio and resuspending the solids from ***,lakes with low water temperature also have a low nitrogen fixation capacity,suggesting that controlling nitrogen in such lakes is feasible if the growth of cyanobacteria is limited by nitrogen.

关键词： Eutrophication N_(2):Ar method Temperature N:P ratio lake water residence time

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