Phosphorus supply pathways and mechanisms in shallow lakes with different regime.
Phosphorus supply pathways and mechanisms in shallow lakes with different regime.
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不同状况浅水湖泊磷素供给途径与机制.
DOI：
10.1016/j.watres.2021.116886
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发表时间：
2021-02
期刊：
影响因子：
12.8
通讯作者：
Yiyong Zhou
中科院分区：
文献类型：
--
作者：
Hui Li;Chunlei Song;Liu Yang;Hangdao Qin;Xiuyun Cao;Yiyong Zhou
为了更好地了解不同状况下磷（P）供应的途径和机制，2017年10月至2018年7月，对中国武汉市2个湖泊4个流域的12个采样点进行了季节性研究。分析了表层水和间隙水中不同形态的磷和氮（N）的浓度，碳（C）、N、P和铁（Fe）化合物的含量以及相关的细胞外酶活性、磷吸附、溶磷细菌（PSB）丰度、沉积物中总和特定（含磷酸酶基因）微生物群落组成。在水生植物占优势的湖泊中，从沉积物到水体的磷供应途径被阻断。在水生植物向藻类转变初期的湖泊中，外源磷输入是主要的磷供给方式。在水生植物向藻类转变后期的湖泊中，PSB驱动的有机磷水解和钙结合磷解离对磷再生贡献很大，且是连续的、滴流式的。在此过程中，快速的碳和氮循环促进了磷的再生。在藻类占主导地位的湖泊中，由于铁结合磷(Fe(OOH)~P)显着较高，平衡磷浓度和脱氢酶活性，主要的磷再生途径可能是缺氧驱动的Fe(OOH)~P的解吸，表现出季节性和脉冲特征。此外，在水生植物向藻类转变的过程中，优势藻类从蓝藻向绿藻转变。溶磷微生物与环境因素相关，表明多个营养循环的耦合，特别是C、N、P、氧（O）和Fe，可以有效增加途径的多样性和磷再生的强度。
In order to better understand the pathways and mechanisms of phosphorus (P) supply under different regimes, 12 sampling sites from 4 basins of 2 lakes were studied seasonally from October 2017 to July 2018 in Wuhan City, China. Concentrations of different forms of P and nitrogen (N) in surface and interstitial water, contents of carbon (C), N, P and iron (Fe) compounds as well as related extracellular enzymatic activities, phosphorus sorption, abundance of phosphorus-solubilizing bacteria (PSB), total and specific (containing phosphatase gene) microbial community composition in sediments were analyzed. In lakes with macrophyte dominance, P supply pathway from sediment to water column was blocked. In lakes being early period of regime shifting from macrophyte to algae, exogenous P input was the main P supply mode. In lakes being later period of regime shifting from macrophyte to algae, organic P hydrolysis and calcium-bound P dissociation driven by PSB contributed greatly to P regeneration, which was continuous and trickling. In this process, rapid C and N cycles fueled P regeneration. In lakes with algal dominance, given the significantly higher iron-bound P (Fe(OOH)~P), equilibriums phosphorus concentration and dehydrogenase activity, the main P regeneration pathway might be the desorption of Fe(OOH)~P driven by anoxia, showing the seasonal and pulsed characteristics. In addition, during the process of regime shift from macrophyte to algae, the dominant algal species switched from cyanobacteria to Chlorophyta. P-solubilizing microorganisms correlated with environmental factors, suggesting the coupling of multiple nutrient cycles, especially C, N, P, oxygen (O) and Fe, could effectively increase the pathways diversification and the strength of P regeneration.
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