Source identification and phosphorus transformation of suspended particulate matter in the eutrophic bays of a large lake (Lake Taihu, China).

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-10-20 DOI:10.1016/j.watres.2025.124835

Yaobin Lv, Man Zhang, Ming Kong, Lingyan Zhang, Hongbin Yin

{"title":"Source identification and phosphorus transformation of suspended particulate matter in the eutrophic bays of a large lake (Lake Taihu, China).","authors":"Yaobin Lv, Man Zhang, Ming Kong, Lingyan Zhang, Hongbin Yin","doi":"10.1016/j.watres.2025.124835","DOIUrl":null,"url":null,"abstract":"<p><p>In shallow eutrophic lakes, particulate P (PP) normally accounts for a large proportion of the total phosphorus (TP) in the water column and strongly influences lake eutrophication. However, the source of PP and their seasonal transformation characteristics remain unclear. Here, we used δ¹³C, δ¹⁵N, and isotopic multivariate mixture models to identify the sources of SPM, while simultaneously analyzing the relationship between P forms and microbial community in SPM. Moreover, a 30-day indoor incubation experiment explored P transformation under varying pH/DO values and its impact on eutrophication. The results show that SPM was derived mainly from phytoplankton and algae in the summer, while it was derived mainly from terrestrial C3 plants and soil organic matter in the other seasons. Compared with sediments, SPM had a significantly higher P content, with Fe-P accounting for the greatest proportion. Firmicutes was the dominant taxon in the microbial community of SPM, facilitating the release of Org-P. Indoor incubations revealed that anaerobic and high-pH conditions significantly promoted the release of Al-P and Fe-P from SPM. According to the eutrophication index model, the water eutrophication index of the SPM group was \"extremely eutrophic\", whereas that of the sediment group was between \"eutrophic\" and \"hyper eutrophic\". The contribution of SPM to water eutrophication is approximately 1.47 times that of sediments. These results indicate that SPM has wider sources and high P activity and is more easily activated by environmental and microbial factors, exacerbating eutrophication.</p>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"289 Pt A","pages":"124835"},"PeriodicalIF":12.4000,"publicationDate":"2025-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water Research","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1016/j.watres.2025.124835","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}

引用次数: 0

Abstract

In shallow eutrophic lakes, particulate P (PP) normally accounts for a large proportion of the total phosphorus (TP) in the water column and strongly influences lake eutrophication. However, the source of PP and their seasonal transformation characteristics remain unclear. Here, we used δ¹³C, δ¹⁵N, and isotopic multivariate mixture models to identify the sources of SPM, while simultaneously analyzing the relationship between P forms and microbial community in SPM. Moreover, a 30-day indoor incubation experiment explored P transformation under varying pH/DO values and its impact on eutrophication. The results show that SPM was derived mainly from phytoplankton and algae in the summer, while it was derived mainly from terrestrial C3 plants and soil organic matter in the other seasons. Compared with sediments, SPM had a significantly higher P content, with Fe-P accounting for the greatest proportion. Firmicutes was the dominant taxon in the microbial community of SPM, facilitating the release of Org-P. Indoor incubations revealed that anaerobic and high-pH conditions significantly promoted the release of Al-P and Fe-P from SPM. According to the eutrophication index model, the water eutrophication index of the SPM group was "extremely eutrophic", whereas that of the sediment group was between "eutrophic" and "hyper eutrophic". The contribution of SPM to water eutrophication is approximately 1.47 times that of sediments. These results indicate that SPM has wider sources and high P activity and is more easily activated by environmental and microbial factors, exacerbating eutrophication.

查看原文本刊更多论文

太湖富营养化海湾悬浮颗粒物来源识别及磷转化

在浅层富营养化湖泊中，颗粒磷（PP）通常占水体总磷（TP）的很大比例，对湖泊富营养化具有重要影响。然而，PP的来源及其季节变化特征尚不清楚。在这里，我们使用δ¹³C、δ¹5 N和同位素多元混合模型来确定SPM的来源，同时分析SPM中P形态与微生物群落之间的关系。此外，通过30天室内培养实验，探讨了不同pH/DO值下磷的转化及其对富营养化的影响。结果表明，夏季SPM主要来源于浮游植物和藻类，其他季节SPM主要来源于陆生C3植物和土壤有机质。与沉积物相比，SPM的P含量显著高于沉积物，其中Fe-P所占比例最大。厚壁菌门是SPM微生物群落的优势类群，有利于Org-P的释放。室内培养表明，厌氧和高ph条件显著促进了SPM中Al-P和Fe-P的释放。根据富营养化指数模型，SPM组水体富营养化指数为“极度富营养化”，而泥沙组水体富营养化指数介于“富营养化”和“超富营养化”之间。SPM对水体富营养化的贡献约为沉积物的1.47倍。这些结果表明，SPM来源广泛，磷活性高，更容易被环境和微生物因子激活，加剧富营养化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.