Nutrients regeneration pathway, release potential, transformation pattern and algal utilization strategies jointly drove cyanobacterial growth and their succession  

作　　者：Hui Li Chunlei Song Liu Yang Hangdao Qin Xiuyun Cao Yiyong Zhou 

机构地区：[1]College of Material and Chemical Engineering,TongRen University,Tongren 554300,China [2]State key laboratory of Freshwater Ecology and Biotechnology,Key laboratory of Algal Biology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China [3]College of Chemistry and Chemical Engineering,Neijiang Normal University,Neijiang 641100,China

出　　处：《Journal of Environmental Sciences》2021年第5期255-267,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41701557,41877381,91951119);Guizhou Science and Technology Department(No.KY[2017]1187);the Major Science and Technology Programme for Water Pollution Control and Treatment(No.2017ZX07603);State Key Laboratory of Freshwater Ecology and Biotechnology(No.2019FBZ01)。

摘　　要：In order to better understand the contribution of nutrients regeneration pathway, release potential and transformation pattern to cyanobacterial growth and succession, 7 sampling sites in Lake Chaohu with different bloom degree were studied every two months from February to November 2018. The carbon, nitrogen(N) and phosphorus(P) forms or fractions in surface, interstitial water and sediments as well as extracellular enzymatic activities, P sorption, specific microbial abundance and community composition in sediments were analyzed. P regeneration pathway was dominated by iron-bound P desorption and phosphorus-solubilizing bacteria solubilization in severe-bloom and slight-bloom area respectively, which both resulted in high soluble reactive phosphorus(SRP) accumulation in interstitial water. However, in severe-bloom area, higher P release potential caused the strong P release and algal growth, compared to slight-bloom area. In spring, P limitation and N selective assimilation of Dolichospermum facilitated nitrate accumulation in surface water, which provided enough N source for the initiation of Microcystis bloom. In summer, the accumulated organic N in Dolichospermum cells during its bloom was re-mineralized as ammonium to replenish N source for the sustainable development of Microcystis bloom. Furthermore, SRP continuous release led to the replacement of Dolichospermum by Microcystis with the advantage of P quick utilization, transport and storage. Taken together, the succession from Dolichospermum to Microcystis was due to both the different forms of N and P in water column mediated by different regeneration and transformation pathways as well as release potential, and algal N and P utilization strategies.

关 键 词：Lake Chaohu Sediment Phosphorus Nitrogen Cyanobacteria bloom 

分 类 号：X524[环境科学与工程—环境工程]