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The nutrient forms, cycling and exchange flux in the sediment and overlying water system in lakes from the middle and lower reaches of Yangtze River

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Science China Earth Sciences 2006年第z1期49卷 1-13页

作者： QIN Boqiang zhu guangwei Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China

This paper is a review of research works concerning the nutrient transportation, transformation and exchange between water, sediment and biota in the lakes from the middle and lower reaches of the Yangtze River conducted in the context of project entitled 'The Processes and Mechanism of Lake Eutrophication in Middle and Lower Reaches of Yangtze River'. All the lakes from this area are shallow lakes. According to the typical lake site research, the lakes from the middle and lower reaches of Yangtze River have a higher baseline of nutrition in the history. Normally the trophic status of these lakes can be categorized into medium-trophic or eutrophic. Human activities have been enhanced during the last decades, which speed up the lake eutrophic process. Lake eutrophication control needs to reduce not only the external nutrient inputs from watershed but also the internal loading from the sediments. Investigations revealed that the lake sediments in this area are considerablly high in nutrition in which at most about 30% of phosphorus exists in the form of bio-available in the sediment. The surface sediment will exert great effects on the nutrient exchange between water-sediment interface via adsorption and release of nutrient. The nutrient release from the sediment in these shallow lakes is mainly in two ways, i.e. in the undisturbed condition the nutrient is released through diffusion created by the nutrient gradient from sediment to overlying water; whereas in disturbed condition, the nutrient release is determined by the hydrodynamic forcing intensity and the sediment resuspension. Metallic elements such as the iron, manganese and aluminium and the aerobic-anaerobic ambience will affect the release of nutrients. The disturbed release will increase the total nutrients in the water column significantly in the short period. At the beginning of sediment resuspension, the dissolved nutrient concentration will increase. This increase will be damped if the ferric oxide and

关键词： shallow lakes, nutrient baseline, internal nutrient release, microbial effects.

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In-situ observations of internal dissolved heavy metal release in relation to sediment suspension in lake Taihu, China

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Journal of Environmental Sciences 2020年第11期32卷 120-131页

作者： Tingfeng Wu guangwei zhu Jianghai Chen Tengteng Yang State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Shanghai Investigation Design&Research Institute Co. Ltd.Shanghai 200434China University of Chinese Academy of Sciences Beijing 100049China

Despite laboratory experiments that have been performed to study internal heavy metal release,our understanding of how heavy metals release in shallow eutrophic lakes remains limited for lacking in-situ *** study used automatic environmental sensors and a water sampling system to conduct high-frequency in-situ observations(1-hr intervals)of water environmental variables and to collect water samples(3-hr intervals),with which to examine the release of internal heavy metals in Lake Taihu,*** conditions of disturbance by strong northerly winds,sediment resuspension in both the estuary area and the lake center caused particulate heavy metal ***,the patterns of concentrations of dissolved heavy metals in these two areas were *** concentrations of dissolved Se and Mo increased in both areas,indicating that release of internal dissolved Se and Mo is triggered by sediment *** concentrations of dissolved Ni,Zn,As,Mn,Cu,V,and Co tended to increase in the estuary area but decrease in the lake *** different trends between these two areas were controlled by pH and cyanobacteria,which are related to *** the strong northerly winds,the decrease in concentrations of dissolved heavy metals in the lake center was attributable primarily to absorption by the increased suspended solids,and to growth-related assimilation or surface adsorption by the increased *** findings of this study suggest that,short-term changes of environmental conditions are very important in relation to reliable monitoring and risk assessment of heavy metals in shallow eutrophic lakes.

关键词： Heavy metals Sediment suspension Process observation Eutrophication

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Responses of alkaline phosphatase activity to wind-driven waves in a large,shallow lake:Implications for phosphorus availability and algal blooms

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Journal of Environmental Sciences 2021年第1期33卷 143-150页

作者： Jian Zhou Xiaoxia Han Boqiang Qin guangwei zhu Taihu Laboratory for Lake Ecosystem Research State Key Laboratory of Lake Science and EnuvironmentNanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Laboratory and Analytical Testing Center Jiangsu Academy of Enuironmental Sciences Environmental Technology Co.LtdNanjing 210036China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China

Phosphorus is a vital nutrient for algal growth,thus,a better understanding of phosphorus availability is essential to mitigate harmful algal blooms in *** waves are a ubiquitous characteristic of lake ***,its effects on the cycling of organic phosphorus and its usage by phytoplankton remain poorly elucidated in shallow eutrophic lakes.A mesocosm experiment was carried out to investigate the responses of alkaline phosphatase activity fractions to wind waves in large,shallow,eutrophic Lake *** showed that wind-driven waves induced the release of alkaline phosphatase and phosphorus from the sediment,and dramatically enhanced phytoplanktonic alkaline phosphatase ***,compared to the calm conditions,bacterial and dissolved alkaline phosphatase activity decreased in wind-wave ***,the gene copies of Microcystis phoX increased but bacterial phoX decreased under wind-wave *** ecological effects of these waves on phosphorus and phytoplankton likely accelerated the biogeochemical cycling of phosphorus and promoted phytoplankton production in Lake *** study provides an improved current understanding of phosphorus availability and the phosphorus strategies of plankton in shallow,eutrophic lakes.

关键词： Wind waves Alkaline phosphatase activity Phosphorus Plankton phoX

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Phosphorus forms and bioavailability of lake sediments in the middle and lower reaches of Yangtze River

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Science China Earth Sciences 2006年第z1期49卷 28-37页

作者： zhu guangwei QIN Boqiang ZHANG Lu Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China

Forms of phosphorus in sediments from 25 lakes in the middle and lower reaches of Yangtze River were analyzed by the sequential extraction procedure. Contents and spatial distrubution of algal available phosphorus (AAP) in sediments of Lake Taihu, the third largest freshwater lake of China, were also studied. Relationships between phosphorus forms in sediment and macrophytes coverage in sample sites, as well as phosphorus forms in sediments and chlorophyal contents in lake water were discussed. Exchangeable form of phosphorus (Ex-P) in surface sediments was significantly positive correlative to total phosphorus (IP), dissolved total phosphorus (DTP) and soluble reactive phosphorus (SRP) contents in the lake water. Bioavailable phosphorus (Bio-P) contents in sediments from macrophytes dominant sites were significantly lower than that in no macrophyte sites. In Lake Taihu, Ex-P content in top 3 cm sediment was highest. However, content of ferric fraction phosphorus (Fe-P) was highest in 4 - 10 cm. Bioavalilble phosphorus (Bio-P) contents in surface sediments positively correlated to Chlorophyll a contents in water of Lake Taihu with significant difference. Therefore, contents of Bio-P and AAP could be acted as the indicators of risks of internal release of phosphorus in the shallow lakes. It was estimated that there were 268.6 ton AAP in top 1 cm sediments in Lake Taihu. Sediment suspension caused by strong wind-induced wave disturbance could carry plenty of AAP into water in large shallow lakes like Lake Taihu.

关键词： shallow lakes sediments phosphorus geochemical forms bioavallabillty eutrophicatlon hydrodynamics.

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Successional conditions of Dolichospermum and Microcystis in Taihu Lake,China

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Journal of Oceanology and Limnology 2024年第6期42卷 1777-1788页

作者： Yuyang LIU guangwei zhu Yawen FAN Chaoxuan GUO College of Science and Technology Harbin Normal UniversityHarbin 150025China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China

Dolichospermum *** Microcystis *** two common cyanobacteria that form blooms in the Changjiang(Yangtze)River basin,but the environmental conditions for their succession in large lakes are still *** on daily monitoring data from Meiliang Bay in Taihu Lake from March to June,2016-2018,we studied the environmental conditions necessary for the succession of these two *** show that from March to June,the dominant genera of cyanobacteria experienced succession and co-dominated with *** succession process included three *** StageⅠ,the biomass of Dolichospermum and Microcystis was similar(March),but Dolichospermum was dominant for most of the *** StageⅡ,dominance alternated between Dolichospermum and Microcystis(April to mid-May).In StageⅢ,the biomass of Microcystis dominated(mid-May to June).In addition,temperature and nutrients across the three stages varied *** average temperature increased continuously from 10.9 to 18.4,and to 24.2℃.The total nitrogen content decreased from 2.87 to 2.40,and to 1.86 mg/*** total phosphorus content increased from 0.08 to 0.09,and to 0.12 mg/*** analysis revealed that Microcystis biomass was positively correlated with temperature and total *** biomass was positively correlated with total *** and regression tree displays that when the temperature was below 18.1℃,Dolichospermum dominated;above 18.1℃,Microcystis took *** analysis revealed that when temperature reached 18℃,the biomass of Microcystis increased exponentially,and the biomass of Dolichospermum exhibited a Gaussian distribution *** finding indicated that temperature was the key factor in the succession of Dolichospermum and Microcystis in nutrient-rich shallow *** nitrogen and phosphorus concentrations decrease,the dominant species of cyanobacteria will diversify its *** results of this study provide a foundation for risk p

关键词： shallow lake cyanobacteria bloom advantage genera meteorological condition nutrient

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Extraction and characterization of bound extracellular polymeric substances from cultured pure cyanobacterium(Microcystis wesenbergii)

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Journal of Environmental Sciences 2014年第8期26卷 1725-1732页

作者： Lizhen Liu Boqiang Qin Yunlin Zhang guangwei zhu Guang Gao Qi Huang Xin Yao State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography & LimnologyChinese Academy of Sciences University of Chinese Academy of Sciences School of Environment and Planning Liaocheng University

Preliminary characterization of bound extracellular polymeric substances（bEPS） of cyanobacteria is crucial to obtain a better understanding of the formation mechanism of cyanobacterial bloom. However,the characterization of bEPS can be affected by extraction methods. Five sets（including the control） of bEPS from Microcystis extracted by different methods were characterized using three-dimensional excitation and emission matrix（3DEEM） fluorescence spectroscopy combined chemical spectrophotometry; and the characterization results of bEPS samples were further compared. The agents used for extraction were NaOH,pure water and phosphate buffered saline（PBS） containing cationic exchange resins,and hot water. Extraction methods affected the fluorescence signals and intensities in the bEPS. Five fluorescence peaks were observed in the excitation and emission matrix fluorescence spectra of bEPS samples. Two peaks（peaks T1 and T2） present in all extractions were identified as protein-like fluorophores,two（peaks A and C） as humic-like fluorophores,and one（peak E） as a fulvic-like *** these substances,the humic-like and fulvic-like fluorescences were only seen in the bEPS extracted with hot water. Also,NaOH solution extraction could result in strong fluorescence intensities compared to the other extraction methods. It was suggested that NaOH at pH 10.0 was the most appropriate method to extract bEPS from Microcystis. In addition,dialysis could affect the yields and characteristics of extracted bEPS during the determination process. These results will help us to explore the issues of cyanobacterial blooms.

关键词： Bound extracellular polymeric substances(bEPS) Extraction Fluorescence intensities Microcystis Three-dimensional excitation and emission matrix(3DEEM)

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

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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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Mechanism and control of lake eutrophication

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Chinese Science Bulletin 2006年第19期51卷 2401-2412页

作者： QIN Boqiang YANG Liuyan CHEN Feizhou zhu guangwei ZHANG Lu CHEN Yiyu Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China College of Environmental Sciences Nanjing University Nanjing 210093 China National Natural Science Foundation of China Beijing 100085 China

A review about lake naturally eutrophi- cating, the internal loading of nutrients from lake sediment as well as the mechanism of algal blooms and the control practices was made, especially the eutrophication problem of shallow lakes since sev- enty percent of fresh water lakes in China are shallow lakes. It was found that shallow lakes are apt toward eutrophication than deep lakes. Without any influ- ences of human activity, shallow lakes in the middle and lower reaches of Yangtze River are still easily eutrophicated, which may be owing to the effects of flood in this area. In shallow lakes, sediments are frequently disturbed by wind-wave and resuspended, which result in huge nutrients release to overlying water. This may be the major reason for higher in- ternal loading of nutrients in shallow lakes than in deep lakes. Algal bloom is an extreme response of lake ecosystem to the eutrophication. Appearance of algal blooms is related to physical condition of lakes, such as underwater radiation (or transparency), temperature, and hydrodynamic conditions, or related to geochemical conditions of lakes, like concentra- tions of nutrients and ratio of nitrogen to phosphorus, as well as the physiological advantage of cyanobac- teria such as vacuole for moving towards the radiant energy-rich zone and the mycosporine-like amino acids (MAAs) for resisting the harm of ultraviolet ra- diation. In shallow lakes, these advantages of cyanobacteria are favorable in the competition than in deep lakes. Also being the shallowness, it is more difficult to reduce nutrient loading and to control algae blooms in shallow lakes. For the control of eutrophi- cation, people should follow the sequence from pollution sources control, ecological restoration tocatchment management. To control the internal nu- trient release, physical, chemical, biological tech- niques, and even bionic techniques could be selected. The idea of ecological restoration for a eutrophic lake is to shift the ecosystem fr

关键词：湖泊超营养作用负载控制生态恢复

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Outbreak of 2-methylisoborneol in a drinking water reservoir attributed to the cyanobacterium Pseudanabaena sp.

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Journal of Oceanology and Limnology 2024年第6期42卷 1789-1804页

作者： Man XIAO Yanzhang WEI Danping ZHENG Liandong SHI Changchun HUANG Yang WANG guangwei zhu Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China School of Geography Sciences Nanjing Normal UniversityNanjing 210023Chin a 3 Shaoxing Yuanshui Group Co. Ltd.Shaoxing 312000China

Taste and odor compounds(T&Os),which is often associated with plankton in water sources,pose significant challenges to water quality in the *** the potential producers and understanding the driving factors are critical for effective *** most studies focused on outbreak of T&Os linked with summer cyanobacterial blooms,questions remain about the mechanisms and environmental factors driving spring outbreaks when cyanobacteria are typically in low ***,changes in the concentrations of T&Os,i.e.,2-methylisoborneol(2-MIB)and three others,in relation to the phytoplankton community,the physico-chemical and hydrological conditions in a mesotrophic reservoir surrounded by hills in East China were investigated from March to June *** show that 2-MIB was the main T&O during the spring outbreak of phytoplankton,and peaked at 96.10 ng/L,which is nearly 10 times of its odor threshold concentration(OTC)of 10 ng/*** filamentous cyanobacterium Pseudanabaena *** identified as the primary producer of 2-MIB,and the cell concentration of 4000 cells/mL of Pseudanabaena *** potentially result in 10 ng/L of 2-MIB in this *** abundance of Pseudanabaena *** 2-MIB were correlated significantly with turbidity,suggesting that a lower light environment might be critical to promote the dominance of Pseudanabaena *** the subsequent production of ***,the combination of consistently decreased water level,moderate water stratification,optimal water temperature ranging~14-23℃,the increase of the chemical oxygen demand using permanganate as an oxidant(CODMn)and total nitrogen(TN)concentration were likely to drive the accumulation and outbreak of *** hydrodynamic disturbance(i.e.,a sudden rapid flow of water)triggered the abrupt disappearance of both Pseudanabaena *** *** study suggests that proliferation of Pseudanabaena *** spring is important in contributing to 2-MIB outbreak,and flushing may be an

关键词： 2-methylisoborneol(2-MIB) cyanobacteria hydrodynamic disturbance Pseudanabaena sp. thermal stratification

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Wind-wave affected phosphate loading variations and their relationship to redox condition in Lake Taihu

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Science China Earth Sciences 2006年第z1期49卷 154-161页

作者： ZHANG Lu zhu guangwei LUO Liancong GAO Guang ZHANG Yunlin QIN Boqiang FAN Chengxin Nanjing Institute of Geography&Limnology Chinese Academy of SciencesNanjing 210008China

Variation of wind speed and the physico-chemical parameters,such as dissolved phosphate,ferrous and manganese in lake water were observed on *** with the chemistry analysis and simulated experiment in lab,the change of phosphate concentration in lake water was *** variation of ferrous/phosphate ratio explained that along with the enhancement of wind-wave effect and the oxidation ability of lake water,the effects of co-precipitation and removal of dissolved phosphate and iron in the lake water were *** ferrous/phosphate ratio in pore water was less than 2.0,demonstrating that the dissolved phosphate can be released into the overlying ***,in the lake water,the stability of phosphate was controlled by the water *** phosphate release experiment showed that molecular release was only part of the whole and the direct discharge of phosphate in the pore water was also a *** mineralization and biological process of suspended particulates in the water may be another important reason for the whole phosphate loadings.

关键词： phosphate internal release redox condition ferrous/phosphate ratio Lake Taihu.

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