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How sediment dredging alters phosphorus dynamics in a lowland rural river?

Journal of Environmental Sciences 2025年第1期147卷 189-199页

作者： Qimou Zhang Jiacong Huang Yulai Ji Jing Zhang Shuai Zhang Junfeng Gao Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 10094China

China’s lowland rural rivers are facing severe eutrophication problems due to excessive phosphorus(P)from anthropogenic ***,quantifying P dynamics in a lowland rural river is challenging due to its complex interaction with surrounding areas.A P dynamic model(River-P)was specifically designed for lowland rural rivers to address this *** modelwas coupled with the Environmental Fluid Dynamics Code(EFDC)and the Phosphorus Dynamic Model for lowland Polder systems(PDP)to characterize P dynamics under the impact of dredging in a lowland rural *** on a two-year(2020-2021)dataset from a representative lowland rural river in the Lake Taihu Basin,China,the coupled model was calibrated and achieved a model performance(R^(2)>0.59,RMSE<0.04 mg/L)for total P(TP)*** research in the study river revealed that(1)the time scale for the effectiveness of sediment dredging for P control was~300 days,with an increase in P retention capacity by 74.8 kg/year and a decrease in TP concentrations of 23%after dredging.(2)Dredging significantly reduced P release from sediment by 98%,while increased P resuspension and settling capacities by 16%and 46%,respectively.(3)The sediment-water interface(SWI)plays a critical role in P transfer within the river,as resuspension accounts for 16%of TP imports,and settling accounts for 47%of TP *** the large P retention capacity of lowland rural rivers,drainage ditches and ponds with macrophytes are promising approaches to enhance P retention *** study provides valuable insights for local environmental departments,allowing a comprehensive understanding of P dynamics in lowland rural *** enable the evaluation of the efficacy of sediment dredging in P control and the implementation of corresponding P control measures.

关键词： Lowland rural river Phosphorus Sediment dredging Model ensemble Retention capacity

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Reduction of thermal stratification due to global warming in winter and spring

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Journal of Oceanology and limnology 2025年第1期43卷 1-15页

作者： Jie LIU Jianming DENG Xiangming TANG State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China School of geography and Ocean Science Nanjing UniversityNanjing 210023China

Global warming has been reported to enhance thermal stratification and decrease the mixlayer depth(MLD)in waters due to higher surface water temperatures,especially in *** studies were conducted for individual cases or specific *** present,there is a lack of global assessments on the influence of climate warming in different seasons on thermal *** ECMWF Reanalysis v5(ERA5)dataset was used to estimate the variability of water body mixing and its drivers in different seasons and *** indicate that global warming could enhance thermal stratification and decrease the MLD globally in *** speed was the primary driver of MLD changes,followed by ***,ice melt due to global warming enhanced the mixing in icecovered waters in the Northern Hemisphere,and early ice melt led to early *** depth was the primary driver of MLD changes in the Northern Hemisphere due to delayed ice formation and earlier melting,while wind speed was the primary driver in other regions or during ice-free *** enhanced mixing due to earlier ice melt out in late winter and early spring could promote water circulation and nutrient turnover,and replenish dissolved oxygen in deep water,thereby promoting the maximum biomass of cyanobacteria and advance harmful algal blooms.

关键词： global warming mix-layer depth(MLD) thermal stratification ice depth ECMWF Reanalysis v5(ERA5)dataset

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Rainfall impacts on nonpoint nitrogen and phosphorus dynamics in an agricultural river in subtropical montane reservoir region of southeast China

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Journal of Environmental Sciences 2025年第3期149卷 551-563页

作者： Yuanyi Wang Hai Xu Xingchen Zhao Lijuan Kang Yu Qiu Hans Paerl Guangwei Zhu Huiyun Li Mengyuan Zhu Boqiang Qin Yunlin Zhang Mingliang Liu Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography&LimnologyChinese Academy of SciencesNanjing 210008China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China School of geography and Ocean Science Nanjing UniversityNanjing 210023China institute of Marine Sciences University of North Carolina at Chapel HillNC 28557USA Hangzhou institute of Ecological and Environmental Sciences Hangzhou 310005China

The increased frequency and intensity of heavy rainfall events due to climate change could potentially influence the movement of nutrients from land-based regions into recipient ***,little information is available on how the rainfall affect nutrient dynamics in subtropicalmontane rivers with complex land *** study conducted high-frequency monitoring to study the effects of rainfall on nutrients dynamics in an agricultural river draining to Lake Qiandaohu,a montane reservoir of southeast *** results showed that riverine total nitrogen(TN)and total phosphorus(TP)concentrations increased continuously with increasing rainfall intensity,while TN:TP *** heavy rainfall and rainstorm drove more than 30%of the annual N and P loading in only 5.20%of the total rainfall period,indicating that increased storm runoff is likely to exacerbate eutrophication in montane ***_(3)^(−)-N is the primary nitrogen form lost,while particulate phosphorus(PP)dominated phosphorus *** source of N is cropland,and themain source of P is residential ***,forestedwatersheds have better drainage quality,while it is still a potential source of nonpoint pollution during rainfall *** and TP concentrations were significantly higher at sites dominated by cropland and residential area,indicating their substantial contributions to deteriorating river water ***,TN and TP concentrations reached high values in May-August when rainfall was most intense,while they were lower in autumn and winter than that in spring and summer under the same rainfall *** results emphasize the influence of rainfall-runoff and land use on dynamics of riverine N and P loads,providing guidance for nutrient load reduction planning for Lake Qiandaohu.

关键词： Non-point source pollution Rainfall events Land use type Mountain area Deepwater reservoir

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Climate changes drive phytoplankton community through complementarity and selection effects in a large mesotrophic reservoir

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Journal of Oceanology and limnology 2025年第1期43卷 119-133页

作者： Yue WU Qi YE Siwen CHEN Lei JIANG Kaining CHEN Shuzhan MA Yiheng CHANG Jie LIU Xiaoli SHI State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China College of nanjing University of Chinese Academy of SciencesNanjing 211135China China State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River Jiangsu Provincial Academy of Environmental ScienceNanjing 210036China School of geography and Ocean Science Nanjing UniversityNanjing 210023China

Understanding the response of the phytoplankton community to climate change is essential for reservoir *** analyzed a long-term data series(2009–2020)on the phytoplankton community in a large mesotrophic reservoir in the wet season to investigate the impacts of temperature and precipitation increases caused by climate change on the functioning and trait composition of the phytoplankton *** the last twelve years,the 3-month accumulative precipitation increased from 291.03 mm to 590.91 mm,and the surface water temperature increased from 25.06℃to 26.49℃in wet season,*** changes caused a higher water level,stronger thermal stratification and lower nitrogen concentration in Daxi *** dynamic equilibrium model indicated that the increased precipitation and water temperature-related environmental changes would result in a more diverse and productive phytoplankton *** effects of increasing water temperature and precipitation on the niche complementarity and selection effects within the phytoplankton community were analyzed using structural equation model by means of the functional divergence index and functional evenness index,respectively,elucidating the reasons for the increase in cyanobacteria in the absence of a significant increase in nutrient *** on these results,it is advisable that more stringent phosphorus control standards might be conducted to reduce the risks of cyanobacteria proliferation in the context of global warming.

关键词： global warming climate change reservoir trait-based phytoplankton functional group cyanobacteria

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Holocene ecological evolution of Tengchong Qinghai Lake responses to climate changes and human activities in Yunnan,southwestern China

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Science China Earth Sciences 2025年第2期68卷 498-508页

作者： Enlou ZHANG Wenxiu ZHENG Yanmin CAO Zhenyu NI Yanjie ZHAO Weiwei SUN Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Nanjing 211135China College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi 435002China College of Resources and Environment South-Central Minzu UniversityWuhan 430074China

Holocene climate change's impact on ecosystems has attracted considerable *** human activities increasingly influenced ecosystems during the Holocene,many paleo-records primarily reconstruct natural environmental changes,often neglecting the pre-instrumental human influenceon ecological *** understand ecosystem responses comprehensively,it is essential to consider anthropogenic impacts alongside natural ***,we present a Holocene chironomid record from Qinghai Crater Lake in Tengchong,southwestern China,examining the timing and magnitude of natural and anthropogenic impacts on the lake ecosystem throughout the *** results reveal that early to midHolocene chironomid communities,especially in terms of species richness,were mainly driven by rising summer temperatures associated with increased solar *** the late-Holocene,the weakening Indian Summer Monsoon led to fluctuating lake levels and intensified human impacts,impacting both chironomid species richness and community *** 0.8 ka BP,enhanced human disturbances shifted the chironomid community composition from mesotrophic taxa dominance(e.g.,Cladotanytasus,Macropelopia)to eutrophic taxa dominance(e.g.,Chironomus,Polypedilum).Over the past few centuries,human influence has further increased chironomid species richness but has led to declining community stability.

关键词： Holocene Chironomid community Climate change Human impact Ecological response Qinghai Crater Lake

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Effects of water level variations on the water quality of Huayang Lakes,China

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Journal of Geographical Sciences 2025年第1期35卷 173-188页

作者： AN Lesheng LIU Chun FAN Zhongya LIAO Kaihua WANG Wencai WANG Nan School of Resources and Environment Anqing Normal UniversityAnqingAnhui246133China South China institute of Environmental Sciences Ministry of Ecology and EnvironmentGuangzhou510655China The Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyCASNanjing210008China

To explore water level variations and their dynamic influence on the water quality of Huayang Lakes,the water level from 1967 to 2023 and water quality from 2015 to 2023 were analyzed using the Mann–Kendall trend test,box plots,and violin *** results show a notable hydrological rhythm of water level alternation between dry and flood seasons in Huayang Lakes,with an average water level of 12.82 m and a monthly range of 11.21–*** 2017,the water level of Huayang Rivers has shown a decreasing trend of–0.02 m/*** phosphorus(TP)has become the primary *** TP concentrations in Longgan Lake(the largest lake)during the dry,rising,flood,and retreating seasons from 2015 to 2023were 0.083,0.061,0.050,and 0.059 mg/L,*** effect of water level on TP was mainly observed during the low-water *** the water level in the dry season rose to 12.25 and 13.00 m,the percentage of TP exceeding 0.1 mg/L in Longgan Lake decreased to 55.8%and 33.3%,*** the dry season,wind and wave disturbances caused the release of endogenous phosphorus in Huayang *** led to drastic fluctuations in TP concentration,reducing the correlation between water level and *** external control is limited,the water level during the dry season should be maintained between 12.25 and 13.0 ***,it is necessary to accelerate the restoration of submerged macrophyte species(such as Hydrilla verticillata and Vallisneria natans)in the Huayang Rivers.

关键词： shallow lake water level water quality total phosphorus Huayang Lakes

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Atmospheric CO_(2) Removal Efficiency through Enhanced Silicate Weathering in Croplands:A Review with Emphasis on the Contribution of Fungi

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Journal of Earth Science 2025年第1期36卷 197-211页

作者： Zi-Bo Li Gaojun Li Jonathan M.Adams Dong-Xing Guan Liang Zhao Rongjun Bian Qing Hu Xiancai Lu Junfeng Ji Jun Chen State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Key Laboratory of Surficial Geochemistry Ministry of EducationSchool of Earth Sciences and Engineering and Frontiers Science Center for Critical Earth Material CyclingNanjing UniversityNanjing 210023China School of geography and Ocean Science Nanjing UniversityNanjing 210023China institute of Soil and Water Resources and Environmental Science College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China institute of Resource Ecosystem and Environment of AgricultureNanjing Agricultural UniversityNanjing 210095China Xiong'an institute of Innovation Chinese Academy of SciencesXiong'an 071700China

Enhanced silicate weathering(ESW)is a geoengineering method aimed at accelerating carbon dioxide(CO_(2))removal(CDR)from atmosphere by increasing the weathering flux of silicate rocks and *** has emerged as a promising strategy for *** studies underscore ESW’s substantial potential for CDR and its diverse benefits for crops when applied to ***,the well-known significant discrepancies in silicate weathering rates between laboratory and field conditions introduce uncertainty in CDR through *** compiling data from recent literature,we calculated and compared CDR efficiency(t CO_(2)t^(-1)_(silicate)ha^(-1)y^(-1))observed in mesocosm experiments and field *** findings indicate that CDR efficiencies in field trials are comparable to or exceeding that observed in mesocosm experiments by 1-3 orders of magnitude,particularly evident with wollastonite *** hierarchy of CDR efficiency among silicates suitable for ESW is ranked as follows:olivine≥wollastonite>basalt>albite≥*** suggest the potential role of biota,especially fungi,in contributing to higher CDR efficiencies observed in field trials compared to mesocosm *** further emphasize introducing fungi known for their effectiveness in silicate weathering could potentially enhance CDR efficiency through ESW in *** before implementing fungal-facilitated ESW,three key questions need addressing:(i)How does the community of introduced fungi evolve over time?(ii)What is the long-term trajectory of CDR efficiency following fungal introduction?and(iii)Could fungal introduction lead to organic matter oxidation,resulting in elevated CO_(2)emissions?These investigations are crucial for optimizing the efficiency and sustainability of fungal-facilitated ESW strategy.

关键词： enhanced weathering carbon dioxide removal efficiency fungi weathering rate altered surface layers

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SDG space:Revealing the structure and complementarities among sustainable development goals in China

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Fundamental Research 2025年第1期5卷 360-369页

作者： Mimi Gong Ke Yu Changchang Zhou Zhouyi Liu Zhenci Xu Ming Xu Shen Qu Center for Systems Integration and Sustainability Department of Fisheries and WildlifeMichigan State UniversityEast LansingMI 48824USA Center for Energy and Environmental Policy Research Beijing Institute of TechnologyBeijing 100081China School of geography Nanjing Normal UniversityNanjing 210023China Department of geography The University of Hong KongHong Kong 999077China School of Environment Tsinghua UniversityBeijing 100084China

To achieve the United Nations Sustainable Development Goals(SDGs)by 2030,it is essential to understand the interlinkages between the *** research has investigated these interactions by focusing on their ***,few studies have systematically prioritized them from a structural perspective through the complementarity measurements and empirically validated their policy effectiveness,such as which goals and indicators impact other SDGs most,especially in *** study introduces a new concept known as the‘SDG space’by employing the“Product Space”approach in network science and *** measures the complementarities between SDGs and indicators through their network structures in investigating effective policy *** the most recent available but unpublished data for 31 Chinese provinces,the SDG space was constructed at the 17 SDG and 118 indicator levels by analyzing the probability of comparative advantage between each SDG or indicator pair co-occurring in the same *** data confirm that in the‘SDG Space’network,a goal connected to other well-developed goals would enjoy better future growth and vice *** structure reveals that SDG 4(Quality Education),15(Life on Land),and 1(No Poverty)are critical goals with transformative synergies to other ***,we identified strong complementarities between land-based ecosystems and clean water and climate actions using the finer-grained indicator-level *** findings help pave the way for China toward a sustainable future by providing science-based policy recommendations for *** can be generally applied to other countries and regions to assist in navigating toward sustainable development.

关键词： Sustainable development goals Network analysis SDG space Product space China

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Characteristics of an early Holocene climate and environment from lake sediments in Ebinur region, NW China

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Science China Earth Sciences 2005年第2期48卷 258-265页

作者： WU Jinglu SHEN Ji WANG Sumin JIN Zhangdong YANG Xiangdong nanjing institute of geography & limnology Chinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China

The characteristics of climatic environment in the early Holocene epoch were studied through analyzing environmental proxies from the sediments in the Ebinur Lake--a closed one in the arid region. The pollen assemblage and other geochemical indices showed that, the temperature was somewhat low in the period (8.0-11.5 cal kaBP) as a whole, but in the early period (11.5-10.6 cal kaBP) the temperature was higher, in company with more precipitation. In the conversion period from the early Holocene epoch to the middle Holocene epoch (8.9-8.0 cal kaBP) the climate fluctuated remarkably. Particularly the three layers of peat sediment revealed the strong instability of climate in the early Holocene epoch in the Ebinur region. All information on the development of peat and the experimental data of pollen and stable isotopes implied that, the climatic condition at 8.2, 8.6 and 10.5 cal kaBP was characterized by noticeable cold and humidness, and could be regarded as three cold and humid events in the early Holocene epoch.

关键词： early Holocene epoch, climatic evolution, pollen assemblege, stable isotopic record, Ebinur Lake.

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Historical trophic evolutions and their ecological responses from shallow lakes in the middle and lower reaches of the Yangtze River: Case studies on Longgan Lake and Taibai Lake

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Science China Earth Sciences 2006年第z1期49卷 51-61页

作者： YANG Xiangdong SHEN Ji DONG Xuhui LIU Enfeng WANG Sumin 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 Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China

The evolutions of diatom floras and the total phosphorous (TP) concentrations in the historical period were reconstructed for two lakes, Longgan and Taibai in the middle Yangtze River,based on high resolutional fossil diatom study from two sediment cores and an established regional diatom-TP transfer function. The TP concentration in Longgan Lake changed slightly in the range of 36-62 μg/L and kept its middle trophic level in the past 200 years. The changes of diatom assemblages reflect a macrophyte-dominated history of the lake. During the nineteenth century, the lake TP concentration increased comparatively, corresponding to the increase in abundance of benthic diatoms. The progressive increase of epiphytic diatoms since the onset of the twentieth century indicates the development of aquatic plants, coinciding with the twice drops of water TP level. The TP concentration in Taibai Lake kept a stable status about 50 μg/L before 1953 AD, while diatoms dominated by facultative planktonic Aulacoseira granulata shifted quickly to epiphytic diatom species, indicating a rapid expansion of aquatic vegetation. During 1953-1970 AD, the coverage of aquatic plants decreased greatly inferred by the low abundance of epiphytic diatoms as well as declined planktonic types, and the reconstructed TP concentration shows an obvious rising trend firstly, suggesting the beginning of the lake eutrophication. The lake was in the eutrophic condition after 1970, coinciding with the successive increase of planktonic diatoms. The comparison of the two lakes suggests the internal adjustment and purification function of aquatic plants for nutrients in water. The discrepancy of TP trends in the two lakes after 1960 reflects two different patterns of lake environmental response to human disturbance. Sediments in Taibai Lake clearly recorded the process of lake ecological transformation from the macrophyte-dominated stage to the algae-dominated stage. The limits of TP concentration (68-118 μg/L) i

关键词： diatom, quantitative reconstruction of total phosphorous, trophic evolution, lake ecology, the middle and lower reaches of Yangtze River.

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