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Phytoplankton functional groups in poyang lake:succession and driving factors

Journal of Oceanology and Limnology 2024年第6期42卷 1764-1776页

作者： Jinfu LIU Haoyue ZOU Feng DENG Yutian LIU Wei LI Jinying XU Songping LIU Qiang WU Xiaoliang ZHANG Fagen WENG Qi HUANG Hailin YOU Yuwei CHEN Jiangxi key laboratory of Hydrology-Water Resources and Water Environment Nanchang Institute of TechnologyNanchang 330099China key laboratory of poyang lake Environment and Resource Utilization Ministry of Educationand School of ResourcesEnvironmental&Chemical EngineeringNanchang UniversityNanchang 330031China Lushan Botanical Garden Jiangxi Province and Chinese Academy of SciencesJiujiang 332900China China Railway Water Conservancy&Hydropower Planning and Design Group Co. Ltd.Nanchang 330029China key laboratory of poyang lake wetland and watershed research Ministry of EducationJiangxi Normal UniversityNanchang 330022China Institute of watershed Ecology Jiangxi Academy of SciencesNanchang 330096China

Phytoplankton functional groups have gained increasing attention in recent *** understand the composition of phytoplankton functional groups in poyang lake and their drivers,field investigations were conducted over three years:2013,2014,and *** were dominated by diatoms,contributing from 20.19%to 57.57%of the total biomass,followed by cyanobacteria,9.81%-39.98%.Microcystis *** Anabaena *** the dominant species among ***-six functional groups were identified among 72 genera or species,and fiver groups(P,B,MP,H1,and G)were categorized *** of dominant groups except H1 were tolerate highly fluctuating mixing intensities and showed a typical monthly succession *** temperature,water level,and nutrients are key drivers for the variation of phytoplankton communities at taxonomic and functional *** of redundancy and variation partitioning analyses showed that environmental variables might explain functional groups better than taxonomic communities,implying that the functional groups were more advantageous in showing the effects of environmental conditions than taxonomic *** conditions have a crucial influence on phytoplankton assemblage dynamics in highly variable water regime lakes,but not in the largest *** functional groups method is suitable for identifying the spatial and seasonal characteristics of aquatic environments that significantly affected by water regimes.

关键词： cyanobacteria bloom light availability nutrients dilution water level poyang lake

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Multifractal process of runoff fluctuation of the Kaidu River in Xinjiang, China

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research in Cold and Arid Regions 2018年第3期10卷 232-239页

作者： Shuang Qing Liu Zu Han Liu Wei Guo Wang Yue Ping Lu Xiao Liang Zhu Bin Guo School of Information Engineering Nanchang Institute of Technology key laboratory of the education ministry for poyang lake wetland and watershed research Jiangxi Normal University research Center for East-West Cooperation in China East China Normal University

Based on the hydrological data in the headwater region of the Kaidu River during 1972-2011, the multifractal process of runoff fluctuation was analyzed. Results indicated that, in the past 40 years, the overall runoff of the Kaidu River in Xinjiang has shown significant multifractal behavior. Its singular curve 1nχq（ε）-1n（ε） verified a favorable scale invariance over the entire time scale, r（q）-q proved that evolution of the runoff time series presented multifractal characteristics. Moreover, the multifractal spectrumf（α）-α curve was hooklike leftward which indicated that, compared to relatively large runoff events. And △f〈0 indicated that these relatively small events took the leading role; B〈0 explained the Kaidu River＇s daily-runoff ascending tendency presented during 1972-2011. Besides that, the multifractal behavior of the Kaidu River＇s runoff variability over four decades was also analyzed. Generally speaking, by decades, their four corresponding spectrum variations were not noticeable. These △α values showed larger runoff events occupied the leading position with some local values falling. During the 1970s to the 1990s, △f〈0 illustrated the probability of the daily runoff at the lowest point is always larger than that of the highest during three continuous decades. At the beginning of the 21 st century, for △f〉0 the trend presented was contrary from the 1970s to the 1990s. B values suggested an overall trend of increases during 1972-2011. Until the 21 st century, the runoff with a slightly descending tendency on the whole explained these relatively large runoff events taking the leading role for the Kaidu River; but sometimes, some small events also played the dominant role.

关键词： multifractal runoff Kaidu River decadal scale

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Testing mechanisms underlying elevational patterns of lakeshore plant community assembly in poyang lake, China

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Journal of Plant Ecology 2019年第3期12卷 438-447页

作者： Zhichun Lan Yasong Chen Lei Li Feng Li Binsong Jin Jiakuan Chen Jiangxi Province key laboratory of watershed Ecosystem Change and Biodiversity Center for Watershed EcologyInstitute of Life ScienceSchool of Life SciencesNanchang UniversityNanchang 330031China Coastal Ecosystems research Station of the Yangtze River Estuary Ministry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringSchool of Life SciencesFudan UniversityShanghai 200438China key laboratory of watershed Ecology and Geographical Environment Monitoring NASGNanchang 330029China key laboratory of poyang lake Environment and Resource Utilization Ministry of EducationNanchang UniversityNanchang 330031China National Ecosystem research Station of Jiangxi poyang lake wetland Nanchang 330038China key laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China

Aims Plant community assembly in wetlands usually changes with eleva-tion gradients,which may be due to the direct effect of flooding and indirect effects such as changes in soil properties and ***,the respective importance of each factor remains to be *** We investigated patterns of plant diversity,community biomass and soil properties along an elevation gradient of a lakeshore meadow at poyang lake,*** Findings(i)With increasing elevation,species richness and Simpson diver-sity index *** aboveground biomass(AGB)and below-ground biomass(BGB)increased with elevation,however,the BGB/AGB ratio also increased,which suggests a significant effect of belowground competition.(ii)Soil N content and soil N:P ratio increased,whereas soil pH decreased with *** soil properties showed no significant response.(iii)Structural equa-tion modeling showed that variation of plant diversity was mainly explained by ***,intensified belowground competition seems to be the primary mechanism causing lower plant diversity at higher elevations.(iv)These findings were further supported by the observed greater response ratio of N and P storage in plant commu-nities than the response ratio of soil N and P content to elevation,suggesting that soil nutrient limitation and belowground nutrient competition increased with *** study has important implications to wetland management and biodiversity conserva-tion under environmental change(*** in flooding regimes,eutrophication).

关键词： belowground competition aboveground competition flooding tolerance nutrient limitation biomass allocation

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Effects of diet shift on the gut microbiota of the critically endangered Siberian Crane

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Avian research 2023年第3期14卷 443-452页

作者： Wenjuan Wang Yafang Wang Qing Chen Huifang Ding School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing100083China Center for East Asian–Australasian Flyway Studies Beijing Forestry UniversityBeijing100083China Jiangxi Province key laboratory of watershed Ecosystem Change and Biodiversity Center for Watershed EcologyInstitute of Life ScienceNanchang UniversityNanchang330031China Jiangxi poyang lake wetland Conservation and Restoration National Permanent Scientific research Base National Ecosystem Research Station of Jiangxi Poyang Lake WetlandNanchang330031China

wetlands worldwide have suffered from serious degradation and transformation,leading to waterbirds increasingly dependent on agricultural fields for *** gut microbiota is an essential component of host health,the impacts of agricultural feeding on gut microbial community and pathogen transmission remain poorly *** fill this knowledge gap,we used 16S rRNA sequencing to characterize the fecal bacterial community of the Siberian Crane(Grus leucogeranus),a Critically Endangered species,that recently has shifted its foraging from largely Vallisneria tubers in poyang lake natural wetlands to crops(i.e.,rice seeds and lotus rhizomes) in agricultural *** compared the bacterial communities between tuber foraging cranes and crop foraging *** results indicate that diet shift greatly modified the gut microbiota diversity,composition and *** foraging cranes had higher microbiota diversity than tuber foraging *** alteration in microbiota composition and function were correlated with change in food ***(i.e.,high in fiber)foraging cranes were enriched in Clostridiaceae with fiber digestion ability,and crop(i.e.,high in carbohydrate)foraging cranes were enriched in bacterial taxa and functions related to carbohydrate *** flexibility of gut microbiota might enhance Siberian Cranes’ ability to adapt to novel diet and ***,many enriched families in crop foraging cranes were pathogenic bacteria,which might increase the susceptibility of cranes to pathogenic *** caution should be taken to agricultural feeding waterbirds in Asia,where the widespread poultry-keeping in over-harvested rice fields might increase the transmission probability of pathogenetic bacteria among wild birds,domestic poultry and humans.

关键词： Diet shift Pathogenic bacteria poyang lake Siberian Crane Vallisneria tuber wetland degradation

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Local temperature and El Niño Southern Oscillation influence migration phenology of East Asian migratory waterbirds wintering in poyang,China

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Integrative Zoology 2017年第4期12卷 303-317页

作者： Fei XU Guanhua LIU Yali SI ministry of education key laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijingChina Jiangxi poyang lake National Nature Reserve Authority Jiangxi Poyang Lake Wetland Ecosystem National Research StationNanchangChina Resource Ecology Group Wageningen UniversityWageningenthe Netherlands Center for Tropical research Institute of the Environment and SustainabilityUniversity of CaliforniaLos AngelesCaliforniaUSA

Temperature is a critical factor influencing avian phenology,due to its direct impact on food and water *** previous studies have focused on the timing of spring migration and the arrival of birds at breeding grounds along the European and American flyways;little is known about migration ecology at the wintering sites along the Asian *** linear regression models,this study investigates how local temperature variation and EI Niño Southern Oscillation(ENSO)influences the arrival and departure timing of 9 waterbird species breeding in Mongolia or Siberia and overwintering in poyang,China from 2002 to *** mainly arrive at poyang in October and depart for their breeding sites in *** of the 9 species,6 show a strong negative relationship between departure time and overwintering temperature in *** dates also show a negative association with overwintering ENSO and March ENSO for two *** local and large-scale climate indices show no influence on the arrival timing of *** suggest that birds react to the annual variation of overwintering temperature:an earlier departure of waterbirds is facilitated by a warmer overwintering period and vice *** long-term accumulated temperature effect is more pronounced than ENSO and the short-term local temperature *** findings could help quantify the potential impact of global warming on waterbirds.

关键词： annual temperature variation arrival and departure time ENSO local accumulated temperature overwintering birds

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Processes and events in the center: a taxi trajectory-based approach to detecting traffic congestion and analyzing its causes

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International Journal of Digital Earth 2023年第1期16卷 509-531页

作者： Yufeng He Barbara Hofer Yehua Sheng Yue Yin Hui Lin key laboratory of poyang lake wetland and watershed research Ministry of EducationJiangxi Normal UniversityNanchangPeople’s Republic of China School of Geography and Environment Jiangxi Normal UniversityNanchangPeople’s Republic of China Department of Geoinformatics–Z_GIS University of SalzburgSalzburgAustria School of Geography Nanjing Normal UniversityNanjingPeople’s Republic of China

A novel approach is introduced for the detection of the location and direction of traffic congestion using GPS data from *** approach uses a dynamic model that conceptualizes events,processes,and *** states are the locations of the taxis,the processes are the motion of taxis,and the events are *** model is implemented as a graph database,which represents the relationships between states,events,processes,and things(such as points of interest and road grid).Algorithms for constructing and updating the relationships and taxi behaviors dynamic retrieval method in Neo4j are presented and are used to demonstrate the capabilities in dynamic expression and *** implementation of Shanghai in 2015finally demonstrated the ability of congestion direction detection and the cause searching of traffic congestion.

关键词： VGE Spatio-temporal dynamics geographic processes traffic congestion trajectory

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Spatio-temporal differences in cloud cover of Landsat-8 OLI observations across China during 2013–2016

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Journal of Geographical Sciences 2018年第4期28卷 429-444页

作者：肖池伟李鹏封志明吴兴元 Institute of Geographic Sciences and Natural Resources research CAS College of Resources and Environment University of Chinese Academy of Sciences key laboratory of poyang lake wetland and watershed research Ministry of Education Jiangxi Normal University

Currently, the historical archive images of Landsat family sensors are probably the most effective data products for tracking global longitudinal changes since the 1970 s. However, the issue of the degree and extent of cloud coverage is always a challenge and varies distinctively worldwide. So far, acquisition probability（AP） analyses of cloud cover（CC） of Landsat observations have been conducted with different sensors at regional scale. To our knowledge, CC probability analysis for the newly-launched Landsat-8 Operational Land Imager（OLI） across China is not reported. In this paper, monthly, seasonal, and annual APs for Landsat OLI（44,228 in total） images over China acquired from April 2013 to October 2016 with various CC thresholds were analyzed. The results showed that： first, the cumulative average APs of all OLI data over China at the CC thresholds ≤30% was about 49.6% which illustrated the availability of OLI imagery across China. Second, the spatial patterns of 10%, 20%, and 30% CC thresholds of OLI observations, coincided well with the precipitation distributions separated by the respective 200 mm, 400 mm, and 800 mm isohyetal lines. Third, the APs of images with the 30% CC threshold are the highest in autumn and winter especially in October of 58.7%, while the corresponding lowest probability occurred in June of 41.0%. Finally, the spatial differences in APs of targeted images with ≤30% CC thresholds were quite significant. At regional scales, the arid and semi-arid areas, Inland River and Songliao River basins, and northwestern side of the Hu Huanyong population line had the larger probabilities of obtaining high-quality images. Our study suggested that OLI imagery satisfy the data requirements needed for land surface monitoring, although there existed obvious spatio-temporal differences in APs over China at the 30% CC threshold.

关键词： cloud cover(CC) spatio-temporal changes Landsat-8 OLI acquisition probability(AP) China

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Preparation of nZVI embedded modified mesoporous carbon for catalytic persulfate to degradation of reactive black 5

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 237-246页

作者： Zhifei Ma Huali Cao Fengchun Lv Yu Yang Chen Chen Tianxue Yang Haixin Zheng Daishe Wu key laboratory of poyang lake Environment and Resource Utilization(ministry of education) School of Resources Environmental&Chemical EngineeringNanchang UniversityNanchang330031China State key laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing100012China

High-efficiency and cost-effective catalysts with available strategies for persulfate(PS)activation are critical for the complete mineralization of organic contaminants in the environmental remediation and protection fields.A nanoscale zero-valent iron-embedded modified mesoporous carbon(MCNZVI)with a core-shell structure is synthesized using the hydrothermal synthesis method and high-temperature *** results showed that nZVI could be impregnated within mesoporous carbon frameworks with a comparatively high graphitization degree,rich nitrogen doping content,and a large surface area and pore *** material was used as a persulfate activator for the oxidation removal of Reactive Black 5(RB5).The effects of the material dosage,PS concentration,pH,and some inorganic anions(i.e.,Cl^(−),SO_(4)^(2−))on RB5 degradation were then *** highest degradation efficiency(97.3%)of RB5 was achieved via PS(20 mmol/L)activation by the MCNZVI(0.5 g/L).The pseudo-first-order kinetics(k=2.11×10^(−2)min^(−1))in the MCNZVI/PS(0.5 g/L,20 mmol/L)was greater than 100 times than that in the MCNZVI and *** reactive oxygen species(ROS),including^(1)O_(2),SO_(4)^(·−),HO^(.),and·O_(2)^(−),were generated by PS activation with the *** oxygen was demonstrated to be the primary ROS responsible for the RB5 *** MCNZVI could be reused and regenerated for *** work provides new insights into PS activation to remove organic contamination.

关键词： MCNZVI Core-shell structure Reactive Black 5 Persulfate Mechanism

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Using Weights of Evidence in the Spatial Relation Between Infected Snails and Geographic Factors

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Geo-Spatial Information Science 2009年第3期12卷 217-224页

作者：赵安鲍曙明宫鹏 School of Geography and Environmental Science Jiangxi Normal University key Lab of poyang lake wetland and watershed research Jiangxi Normal University and Ministry of Education

Schistosomiasis is a serious public health problem in the middle-lower Yangtze River Basin in China. Study of spatial variation of snail distribution that is related to microgeographic factors can help to choose pertinent measures for snail extinguishment and environment rebuilding. This paper studied the theoretical architecture of weights-of-evidence approach. The case study was made for spatial relation between the occurrence of infected snails and geographic factor combinations in Waijiazhou marshland of poyang lake region in China. The multievidence data came from the geographical factor combinations by crossing operation of vegetation coverage grade layer, cattle route distance grade layer, and special environment layer (181 combinations in total) in GIS. The calculation of weight contrast index shows that high vegetation coverage, cattle route distance of <45 meters, and special geographic factor "ground depression" had direct spatial relation with the occurrence of infected snails. The verification by crossing operation in GIS indicated 72.45% of the infected snails concentrated on the areas of positive weight contrast index (sequenced in an order of weight contrast index from high to low), demonstrating the high efficiency of the model established in finding infected snails according to the geographic factor combinations that can be explicitly discerned in the study area.

关键词： weights of evidence Bayesian conditional probability infected snail poyang lake region

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Temporal changes in mixing effects on litter decay and nitrogen release in a boreal riparian forest in northeastern China

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Journal of Forestry research 2024年第2期35卷 33-41页

作者： Simin Wang Bo Liu Rui Li Xiaoxin Sun Rong Mao key laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of poyang lake watershed College of ForestryJiangxi Agricultural UniversityNanchang 330045People’s Republic of China key laboratory of wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102People’s Republic of China key laboratory of Sustainable Forest Ecosystem Management of ministry of education School of ForestryNortheast Forestry UniversityHarbin 150040People’s Republic of China Heilongjiang Sanjiang Plain wetland Ecosystem research Station Fuyuan 156500People’s Republic of China

In riparian forests,litter decay provides essential energy and nutrients for both terrestrial and fluvial *** mixing effects(LMEs)are crucial in regulating litter decay and nutrient dynamics,yet how LMEs change over time is unclear in riparian *** this study,leaf litter of three common species(Alnus sibirica *** Turcz,Betula platyphylla Sukaczev,and Betula fruticosa Pall.)were mixed in an equal mass ratio and LMEs were measured for mass and nitrogen(N)remaining in whole litter mixtures over a 3-year period in a boreal riparian forest,northeastern *** were also assessed for component litter mass and N remaining by separating litter mixtures by *** the decay of litter mixtures,antagonistic effects on mass and N remaining were dominant after one and two years of decay,whereas only additive effects were observed after three *** correlated negatively with functional diversity after the first and two years of decay but disappeared after three *** sorting litter mixtures by species,non-additive LMEs on mass and N remaining decreased over incubation ***,non-additive LMEs were more frequent for litter of both *** and *** with lower N concentration than for *** litter with higher N *** results indicate that incubation time is a key determinant of litter mixing effects during decay and highlight that late-stage litter mixture decay may be predicted from single litter decay dynamics in boreal riparian forests.

关键词： Biodiversity Litter quality Litter mixtures Synergistic effects Functional diversity

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