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Total nitrogen and community turnover determine phosphorus use efficiency of phytoplankton along nutrient gradients in plateau lakes

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Journal of Environmental Sciences 2023年第2期124卷 699-711页

作者： Yun Zhang Hucai Zhang Qi Liu Lizeng Duan Qichao Zhou Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental SciencesYunnan UniversityKunming 650500China

Numerous studies support that biodiversity predict most to ecosystem functioning,but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied.We investigated 398 samples of the phytoplankton phosphorus resource use efficiency(RUE_(P)=chlorophyll-a concentration/dissolved phosphate)across two seasons in nine plateau lakes in Yunnan Province,China.We identified the main contributors to phytoplankton RUEP and analyzed their potential influences on RUEP at different lake trophic states.The results showed that total nitrogen(TN)contributed the most to RUEP among the nine lakes,whereas community turnover(measured as community dissimilarity)explained the most to RUEP variation across the two seasons.Moreover,TN also influenced RUEP by affecting biodiversity.Species richness(SR),functional attribute diversity(FAD2),and dendrogram-based functional diversity(FDc)were positively correlated with RUEP in both seasons,while evenness was negatively correlated with RUEP at the end of the rainy season.We also found that the effects of biodiversity and turnover on RUEP depended on the lake trophic states.SR and FAD2 were positively correlated with RUEP in all three trophic states.Evenness showed a negative correlation with RUEP at the eutrophic and oligotrophic levels,but a positive correlation at themesotrophic level.Turnover had a negative influence on RUEP at the eutrophic level,but a positive influence at the mesotrophic and oligotrophic levels.Overall,our results suggested that multiple factors and nutrient states need to be considered when the ecosystem functioning predictors and the biodiversityecosystem functioning relationships are investigated.

关键词： Community turnover Biodiversity Phytoplankton Resource use efficiency Taxonomic diversity Total nitrogen

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Environmental arsenic(As)and its potential relationship with endemic disease in southwestern China

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Journal of Environmental Sciences 2024年第5期139卷 46-59页

作者： Donglin Li Hucai Zhang Fengqin Chang Lizeng Duan Yang Zhang Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunming 650500China Southwest United Graduate School Kunming 650500China

Many cases of an unknown disease exhibiting the clinical features of limb gangrene,blisters,ulceration,and exfoliation have been reported in Daping village(DV)in southwestern China.However,the pathogenesis is unknown and has puzzled doctors for many years.A preliminary study on heavy metals and symptoms indicated that arsenic might pose the greatest threat to the health of local residents.Here,to explore the sources of and factors influencing arsenic enrichment in DV,whose residents exhibit signs of arsenic poisoning,the As contents in soil,water,and plants were systematically measured.The results indicated high As contents in plant and soil samples obtained from the area,and the source of As may be linked to the weathering of black shale rock.Ingestion of soil and consumption of plants were the two main As exposure pathways among children and adults,respectively,and children exhibited a higher health risk than adults.We presume and emphasize that when extreme drought events occur,humans might face unusual risks resulting from exposure to toxic elements and the direct consumption of highly polluted water.Our study provides a new perspective and sheds light on the environmental geochemistry and health links of this disease.

关键词： Endemic disease Arsenic(As) Risk assessment Black shale Climate change

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PdNi/N-doped graphene aerogel with over wide potential activity for formic acid electrooxidation

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Journal of Energy Chemistry 2021年第8期30卷 748-754,I0016页

作者： Yufei Bao Meng Zha Pengliang Sun Guangzhi Hu Ligang Feng School of Chemical Science and Technology and Institute for Ecological Research and Pollution Control of Plateau Lakes Yunnan UniversityKunming 650504China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

Anti-CO poisoning ability is significant in formic acid oxidation in the fuel cell technique.Herein,Pd Ni alloy supported on N-doped graphene aerogel(Pd Ni/GA-N)was found to have catalytic ability toward formic acid electrooxidation over a wide potential range because of the improved anti-CO poisoning ability.This catalyst was fabricated by simple freeze-drying of mixture solution of graphene aerogel,polyvinylpyrrolidone,Pd^(2+)and Ni^(2+)and the subsequent thermal annealing reduction approach in the N2/H2 atmosphere.Pd-Ni alloy particles anchored over the folding N-doped graphene surface with a porous hierarchical architecture structure in the 3 D directions.It showed the catalytic performance of its maximum mass activity of 836 m A mg^(-1)in a broad potential range(0.2-0.6 V)for formic acid oxidation.The CO stripping experiment demonstrated its largely improved anti-CO poisoning ability with the peak potential of 0.67 V,approximately 60 and 40 m V less compared to those of Pd/GA-N and Pd/C samples.The high anti-CO poisoning ability and strong electronic effect resulting from the interaction between the3 D GA-N support and the Pd-Ni alloy makes it a promising catalyst for application in direct formic acid fuel cells.

关键词： Fuel cells Formic acid oxidation reaction PdNi Graphene aerogel

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Structural Geology and Chronology of Shear Zones along the Shangdan Suture in Qinling Orogenic Belt, China:Implications for Late Mesozoic Intra-Continental Deformation of East Asia

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Journal of Earth Science 2022年

作者： Falak Sheir Wei Li Le Zhang Basil Alabowsh Liuqing Jiang Li Liang Sainan Gao Shair Baz Umar Ashraf Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan University State Key Laboratory of Continental Dynamics Department of Geology Northwest University institute of Geology University of PunjabLahore

The Shangdan suture zone(SDZ) in the Qinling orogenic belt(QOB) is a key to understanding the East Asia tectonic evolution. The SDZ gives information about convergent processes between the North China Block(NCB) and South China Block(SCB). In the Late Mesozoic, several shear zones evolved along the SDZ boundary that helps us comprehend the collisional deformation between the NCB and SCB, which was neglected in previous studies. These shear zones play an essential role in the tectonic evolution of the East Asia continents. This study focuses on the deformation and geochronology of two shear zones distributed along the SDZ, identified in the Shaliangzi and Maanqiao areas.The shear sense indicators and kinematic vorticity numbers(0.54–0.90) suggest these shear zones have sinistral shear and sub-simple shear deformation kinematics. The quartz’s dynamic recrystallization and c-axis fabric analysis in the Maanqiao shear zone(MSZ) revealed that the MSZ experienced deformation under green-schist facies conditions at ～400–500℃. The Shaliangzi shear zone deformed under amphibolite facies at ～500–700 ℃. The40Ar/39Ar(muscovite-biotite) dating of samples provided a plateau age of 121–123 Ma. Together with previously published data, our results concluded that QOB was dominated by compressional tectonics during the Late Early Cretaceous. Moreover, we suggested that the Siberian Block move back to the south and Lhasa-Qiantang-Indochina Block to the north, which promoted intra-continental compressional tectonics.

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Detecting anthropogenic impact on forest succession from the perspective of wood exploitation on the northeast Tibetan plateau during the late prehistoric period

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Science China Earth Sciences 2022年第11期65卷 2068-2082页

作者： Fengwen LIU Shanjia ZHANG Hucai ZHANG Guanghui DONG Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environment ScienceYunnan UniversityKunming 650504China Ministry of Education Key Laboratory of Western China's Environmental System College of Earth&Environmental SciencesLanzhou UniversityLanzhou 730000China

Human activities are usually considered to have had impacts on forest degradation and/or changes of forest composition in the past.The Tibetan plateau,an environmentally sensitive area,has witnessed a high intensity of human activities since the late Neolithic,but the evidence is still incomplete concerning how human activities affected the environment,especially vegetation changes.This may result,in part,from the fact that research on prehistoric wood utilization by humans in the northeast Tibetan plateau(NETP)is scarce,especially from the perspective of charcoal analysis,which is an archaeological index directly related to human activities.To fill this gap,we report new data here concerning charcoal analysis from 24 archaeological sites dated 5200–2300 a BP in the NETP,where this period saw remarkable environmental and social changes.By coupling the results with published paleoenvironment records(especially pollen),we aim to explore the utilization of wood and its spatial-temporal changes,as well as the anthropogenic impacts on past forest dynamics in the NETP.The results suggest that the wood resources collected by humans were mainly needleleaf trees(Picea L.and Pinus L.),broadleaved trees(Populus L.,Salix L.,and Betula)as well as shrubs(Hippophae L.and Tamarix L.),and that these were distributed around the human habitation areas.There was a clear spatial difference in the woody assemblage collected by humans in the period 3600–2300 a BP.This was likely related to the diversity of natural environments in local areas,but there was an abnormal spatial pattern of forest composition with broadleaved trees dominant above 2500 masl caused not by climate change,but by the rapid increase of human settlement and wood collection in high altitude areas of the NETP since 3600 a BP.

关键词： Charcoal records Late prehistoric period Northeast Tibetan plateau Climate change Anthropogenic impacts

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Competition between acidic sites and hydrogenation sites in Cu/ZrO_(2) catalysts with different crystal phases for conversion of biomass-derived organics

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Green Energy & Environment 2021年第4期6卷 557-566页

作者： Yuewen Shao Tingting Wang Kai Sun Zhanming Zhang Lijun Zhang Qingyin Li Shu Zhang Guangzhi Hu Xun Hu School of Material Science and Engineering University of JinanJinan250022China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunming 650504China

Oxides with different crystal phases can have important effects on the configuration of surface atoms,which can further affect the distribution of hydrogenation sites and acidic sites as well as the competitions of these varied types of catalytic sites.This could be potentially used to tailor the distribution of the products.In this study,zirconium oxides with different crystal phases supported copper catalysts were prepared for the hydrogenation of the biomass-derived furfural,vanillin,etc.The results showed that both calcination temperature and Cu species affected the shift of zirconia from tetragonal phase to the monoclinic phase.Monoclinic zirconia supported copper catalyst can effectively catalyze the hydrogenation of furfural to furfuryl alcohol via hydrogenation route due to its low amount of Brønsted acidic sites,although the surface area and the exposed metallic Cu surface area were much lower than the tetragonal zirconia supported copper catalyst.Zirconia with tetragonal or tetragonal/monoclinic phases supported copper catalysts contain abundant acidic sites and especially the Br?nsted acidic sites,which catalyzed mainly the conversion of furfural via the acid-catalyzed routes such as the acetalization,rather than the hydrogenation.The acidic sites over the Cu/ZrO_(2)catalyst played more predominant roles than the hydrogenation sites in determining the conversion of the organics like furfural and vanillin.

关键词： Zirconia supported copper catalyst Crystal phase Hydrogenation Hydrogenation sites Acidic sites

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NiCo_(2)O_(4) hollow microsphere-mediated ultrafast peroxymonosulfate activation for dye degradation

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Chinese Chemical Letters 2021年第8期32卷 2495-2498页

作者： Pengjia Ding Jianrui Niu Fengqin Chang Zhuang He Thomas Wagberg Zaixing Li Guangzhi Hu College of Environmental Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunming 650504China Department of Physics Umea UniversityUmeå90187Sweden

Morphology and dispersity are key factors for activating peroxymonosulfate(PMS).In this study,we designed a recyclable open-type NiCo_(2)O_(4) hollow microsphere via a simple hydrothermal method with the assistance of an NH_(3) vesicle.The physical structure and chemical properties were characterized using techniques such as scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD),N2 adsorption and X-ray photoelectron spectroscopy(XPS).The test results confirm that the inner and outer surfaces of open-type NiCo_(2)O_(4) hollow-sphere can be efficiently utilized because of the hole on the surface of the catalyst,which can minimize the diffusion resistance of the reactants and products.Under optimized conditions,the total orga nic carbon(TOC) removal efficiency of rhodamine B(RhB) can reach up to 80% in 40 min,which is almost 50% shorter than the reported values.The reactive radicals were identified and the proposed reaction mechanism was well described.Moreover,the disturbances of HCO_(3)^(-),NO_(3)^(-),Cl^(-)and H_(2) PO_(4)^(-)were further investigated.As a result,HCO_(3)-and NO_(3)-suppressed the reaction while Cl-and H_(2) PO4-had a double effect on reaction.

关键词： Open-type sphere Hollow NiCo_(2)O_(4) Vesicle Inner and outer surface Ultra peroxymonosulfate activation

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Eco-chemical mechanisms govern phytoplankton emissions of dimethylsulfide in global surface waters

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National Science Review 2021年第2期8卷 43-50页

作者： Xuwei Deng Jun Chen Lars-Anders Hansson Xia Zhao Ping Xie Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology of ChinaInstitute of HydrobiologyChinese Academy of Sciences Department of Biology/Aquatic Ecology Lund University State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan University

The anti-greenhouse gas dimethylsulfide(DMS) is mainly emitted by algae and accounts for more than half of the total natural flux of gaseous sulfur to the atmosphere, strongly reducing the solar radiation and thereby the temperature on Earth. However, the relationship between phytoplankton biomass and DMS emissions is debated and inconclusive. Our study presents field observations from 100 freshwater lakes, in concert with data of global ocean DMS emissions, showing that DMS and algal biomass show a hump-shaped relationship, i.e. DMS emissions to the atmosphere increase up to a p H of about 8.1 but, at higher p H, DMS concentrations decline, likely mainly due to decomposition. Our findings from lake and ocean ecosystems worldwide were corroborated in experimental studies. This novel finding allows assessments of more accurate global patterns of DMS emissions and advances our knowledge on the negative feedback regulation of phytoplankton-driven DMS emissions on climate.

关键词： phytoplankton lake ecosystem biological regulation of global climate dimethylsulfide global surface oceans

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Who is the missing “matchmaker” between proteins and nucleic acids?

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The Innovation 2021年第3期2卷 26-27页

作者： Ping Xie Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and BiotechnologyInstitute of HydrobiologyChinese Academy of SciencesWuhan 430072P.R.China Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunming 650500P.R.China

Sixty years has passed since the cracking of the genetic code by Nirenberg and Matthaei in 1961;however,the origin of the code remains one of the greatest mysteries.It is great for a cell to innovate protein synthesis manipulated by RNA,and vice versa,which is a still unsolved“chicken-and-egg”paradox.Finding a solution is of crucial importance.Yet,most biologists hold a pessimistic view that no one knows exactly how the genetic code came into being,as an exact reconstruction of the process of the construction of genetic code may never be possible,or as there is no evidence in physics or chemistry of the control of chemical reactions by a sequence of any sort or of a code between sequences,and many papers have been published with titles indicating that their subject is the origin of the genetic code,while the content actually deals only with the evolution of the genetic code1.

关键词： exact exactly synthesis

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Do alternative stable states exist in large shallow Taihu Lake,China?

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Journal of Oceanology and Limnology 2023年第3期41卷 959-971页

作者： Yan LI Yu MA Haijun WANG Hongzhu WANG Yongde CUI Shijun BIAN Miao ZHANG Mengmei LIU Yexin YU Marc SCHALLENBERG State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunming 650504China University of Chinese Academy of Sciences Beijing 100049China Department of Zoology University of OtagoPO Box 56Dunedin 9054New Zealand

Regime shifts from submersed macrophyte dominance to phytoplankton dominance have been widely reported in small-to medium-sized shallow lakes.However,alternative stable states in large shallow lakes(surface area>500 km^(2))remain unconfirmed.To understand the alternative stable states and the main influencing factors of submersed macrophytes in large lakes,the ecosystem states from monitoring data from 1959 to 2019 in large shallow Taihu Lake(2338 km^(2)in average depth of 2.12 m)in China were examined.Changes in submersed macrophyte coverage(C_(Mac))and phytoplankton chlorophyll a(Chl a)in the time series and their relationships with environmental factors were analyzed.During the field investigation from August 2018 to May 2019,nutrients and Chl a showed obvious heterogeneity across the lake,being generally higher in the western and northern areas and lower in the southeast area,while C_(Mac)was only observed in the eastern areas,e.g.,East Taihu Lake,Xukou Bay,and Gonghu Bay.During the long-term monitoring from 1959 to 2019 in the Central Region,Meiliang Bay,and East Taihu Lake,Chl a increased significantly in the time series.C_(Mac)varied slightly among different subareas,always at low levels(lakes but generally presented with higher values of nonalgal turbidity(TurbNonAlg),as did their contribution to total turbidity as a percentage.This study suggested that large shallow Taihu Lake may have no alternative

关键词： alternative stable state submersed macrophyte phytoplankton Taihu Lake large shallow lake

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