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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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Response mechanism of soil microorganisms to simulated precipitation in the source wetland of Qinghai lake

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Ecological Processes 2024年第2期13卷 61-71页

作者： Xinye Wang Ni Zhang Kelong Chen Tiexi Chen Desheng Qi Yuanxi Ma School of Geographical Sciences Qinghai Normal University National Positioning Observation and research Station of Qinghai lake wetland Ecosystem in Qinghai National Forestry and Grassland Administration key laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation(ministry of education) Qinghai Normal University School of Geographical Sciences Nanjing University of Information Science and Technology Qinghai Provincial land spatial Planning research Institute

Background Changes in precipitation patterns crucially impact soil microbial communities, and the ecosystem in Qinghai-Tibet Plateau(QTP) is highly vulnerable to climate change. However, we do not fully understand how soil microbial communities in the source wetlands of QTP respond to changes in precipitation. In this study, we employed advanced techniques such as high-throughput sequencing and metabolomics to investigate how soil microbial communities in a source wetland of Qinghai lake respond to changes in precipitation after quadrennial precipitation *** Our findings showed that the predominant microbiota in the source wetland was Proteobacteria. Interestingly, alterations in precipitation levels, whether increased or reduced, did not significantly impact the diversity or functional groups of the microbial community. However, the structure of the microbial community did respond notably to changes in precipitation, leading to shifts in the relative abundance of Spirochaetes and Treponema. A notable finding was that reduced precipitation levels(– 25% and-50%) and mild increases in precipitation(25%) within the region contributed to increased soil carbon content. However, this effect ceased to manifest when precipitation increased by 50%. Additionally, the reduction in precipitation prompted the release of soil metabolites like syringic acid and aldosterone, while enhanced precipitation resulted in a decrease in aldosterone *** Precipitation changes altered the relative abundance of soil microbial communities and metabolites, which was conducive to increasing carbon storage in this alpine wetland.

关键词： Qinghai-Tibet Plateau Climate change Precipitation gradient Carbon and nitrogen cycles LC/MS

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Taxonomy of Two New Peritrich Ciliates(Protozoa:Ciliophora)from Inland Saltwaters of China

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Journal of Ocean University of China 2024年第3期23卷 811-821页

作者： YU Ying ZHANG Yong LIANG Ziyao LI Jiqiu LIN Xiaofeng key laboratory of ministry of education for Coastal and wetland Ecosystems Fujian Provincial Key Laboratory of Coastal Ecology and Environmental StudiesCollege of the Environment and EcologyXiamen UniversityXiamen 361102China School of Life Science South China Normal UniversityGuangzhou 510631China State key laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China

The inland saltwater lakes harbor exceptional ***,two new species of solitary sessile peritrich ciliates were isolated from Qinghai lake,the largest inland saltwater lake in *** morphology,ciliature,silverline system,and molecular phylogeny were investigated based on live observation,silver staining,and analysis of the small subunit ribosomal DNA(SSU rDNA).Vorticella paraglobosa *** characterized mainly by its obconical or elongate bell-shaped zooid,C-shaped macronucleus,single ventrally located contractile vacuole,two-rowed infundibular polykinety 3,and 28-38 silverlines between peristome and aboral tro-chal band and 10-15 between aboral trochal band and *** cotyliformis *** from its congeners mainly by its double-layered peristomial lip,cup-shaped zooid,J-shaped macronucleus,single ventrally positioned contractile vacuole,three-rowed infundibular polykinety 3,and 70-85 silverlines between peristome and aboral trochal band and 21-25 between aboral trochal band and *** SSU rDNA sequences of the two new species were obtained,and the subsequent molecular phylogenetic analysis supported their taxonomic classification.

关键词： molecular phylogeny morphology new species Qinghai lake taxonomy

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Physiochemical and biological characteristics of fouling on landfill leachate treatment systems surface

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Journal of Environmental Sciences 2024年第1期135卷 59-71页

作者： Zhourui Gong Shu Yang Rui Zhang Yangqing Wang Xiaoqing Wu Liyan Song School of resources and environmental engineering Anhui UniversityHefei 230601China Anhui Shengjin lake wetland Ecology National Long-term Scientific research Base Dongzhi 247230China key laboratory of Three Gorges Reservoir Region’s Eco-Environment Ministry of EducationChongqing UniversityChongqing 400045China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China Xing Lu Huan Jing Co.LTD. Luzhou 646000China

Fouling of landfill leachate,a biofilm formation process on the surface of the collection system,migration pipeline and treatment system causes low efficiency of leachate transportation and treatment and increases cost for maintenance of those *** addition,landfill leachate fouling might accumulate pathogens and antibiotic resistance genes(ARGs),posing threats to the *** of the landfill leachate fouling and its associated environmental behavior is essential for the management of *** this study,physicochemical and biological properties of landfill leachate fouling and the possible accumulation capacity of pathogens and ARGs were investigated in nitrification(aerobic condition)and denitrification(anaerobic condition)process during landfill leachate biological treatment,*** show that microbial(bacterial,archaeal,eukaryotic,and viral)community structure and function(carbon fixation,methanogenesis,nitrification and denitrification)differed in fouling under aerobic and anaerobic conditions,driven by the supplemental leachate water *** fouling had a higher abundance of nitrification and denitrification functional genes,while anaerobic fouling harbored a higher abundance of carbon fixation and methanogenesis *** forms of leachate fouling had a higher abundance of pathogens and ARGs than the associated leachate,suggesting the accumulation capacity of fouling on biotic ***,aerobic fouling harbored three orders of magnitude higher multidrug resistance genes mex D than its associated *** finding provides fundamental knowledge on the biological properties of leachate fouling and suggests that leachate fouling might harbor significant pathogens and ARGs.

关键词： Landfill leachate fouling Biofilm Microbiome Carbon and nitrogen cycle Pathogens Antibiotic resistance genes

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2000-2020年中国建设用地扩张侵占耕地的时空特征及其与粮食产量的空间关系

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Journal of Geographical Sciences 2024年第5期34卷 855-870页

作者：李资华丁明军谢坤李静茹陈利文 Territorial Spatial Survey and Planning Institute Department of Natural Resources of Jiangxi ProvinceNanchang 330025China Engineering Technology Innovation Center for Ecological Protection and Restoration of Land Space in the Great lakes Basin Ministry of Natural ResourcesNanchang 330025China School of Geography and Environment Jiangxi Normal UniversityNanchang 330028China key Lab of poyang lake wetland and watershed research of ministry of education and School of Geography and Environment Jiangxi Normal UniversityNanchang 330028China Yuzhang Normal University Nanchang 330103China Nanjing Engineering Vocational College of Jiangsu Province Nanjing 211135China

Construction land expansion is a key driver of urbanization and industrialization,yet it poses the risk of losing farmland and cascading impacts on food *** spatial char-acteristics of farmland occupied by construction land and its association with grain yield in China were *** analyzed the characteristics of farmland converted into construction land,and its relationship with grain yield in China for *** land increased in area in central and western regions of China,and farmland decreased in area in south-eastern *** expansion of construction land in the North China Plain,Northeast China Plain,and the Loess Plateau,occurred at the expense of *** the southeast coast of China,grain yield increase was only weakly dependent on farmland *** in which farmland was converted into construction land and grain-yield change were highly coupled in southeastern coastal China,Sichuan Basin,Shandong Peninsula,and the Hu Huanyong *** should be noted that expansion in construction land area does have some influence on grain production;ultimately it is greatly affected by yield per unitarea.

关键词： construction land expansion change in farmland grain yield temporal and spatial variation Chinese counties

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WMO:an ontology for the semantic enrichment of wetland monitoring data

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International Journal of Digital Earth 2023年第1期16卷 2189-2211页

作者： Xin Xiao Hui Lin Chaoyang Fang School of Geography and Environment&key laboratory of poyang lake wetland and watershed research Ministry of EducationJiangxi Normal UniversityNanchangPeople's Republic of China

Rich observation data generated by ubiquitous sensors are vital for wetland monitoring,spanning from the prediction of natural disasters to emergency *** sensors use different data acquisition and description methods and,if combined,could provide a comprehensive description of the ***,these data remain hidden in isolated silos,and their variety makes integration and interoperability a significant *** this work,we develop a semantic model for wetland monitoring data using an agile and modular approach,namely,wetland monitoring ontology(WMO),which containsfive modules:wetland ecosystem,monitoring indicator,monitoring context,geospatial context,and temporal *** proposed ontology supports the semantic interoperability and integration of wetland monitoring data from multiple sources,domains,modes,and spatiotemporal *** also provide two real-world use cases to validate the WMO and demonstrate the WMO’s usability and reusability.

关键词： Ontology knowledge graph wetland monitoring semantic interoperability spatiotemporal data

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Effects of Water-table Depth and Soil Moisture on Plant Biomass, Diversity, and Distribution at a Seasonally Flooded wetland of poyang lake, China

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Chinese Geographical Science 2015年第6期25卷 739-756页

作者： XU Xiuli ZHANG Qi TAN Zhiqiang LI Yunliang WANG Xiaolong key laboratory of watershed Geographic Sciences Nanjing Institute of Geography and Limnology Chinese Academy of Sciences University of Chinese Academy of Sciences key laboratory of poyang lake wetland and watershed research Ministry of Education Jiangxi Normal University

Hydrological regime has been widely recognized as one of the major forces determining vegetation distribution in seasonally flooded wetland. poyang lake, the largest freshwater lake in China, has been encountering dramatic changes in hydrological conditions in last decade, which greatly influenced the wetland vegetations. To explore the relationships between hydrology and vegetation distri- bution, water-table depth, soil moisture, species composition, diversity and biomass were measured at a seasonally flooded wetland section at Wucheng National Nature Reserve. Three plant communities, Artemisia capillaris, Phragmites australis and Carex cineras- cens communities, were examined which are zonally distributed from upland to lakeshore with decreasing elevation. Canonical corre- spondence analysis （CCA）, spearmen correlation and logistic regression were adopted to analyze the relationships between vegetation characteristics and hydrological variables of water-table depth and soil moisture. Results show that significant hydrological gradient exist along the wetland transect. Water-table demonstrates a seasonal variation and is consistently deepest in A. capillaris community （ranging from q）.5 m above ground to ＋10.3 m below ground）, intermediate in P. australis community （-2.6 m to ＋7.8 m） and shallow- est in C. cinerascens community （-4.5 m to ＋6.1 m）. Soil moisture is lowest and most variable in A. capillaris community, highest and least variable in P. australis community, and intermediate and moderate variable in C. cinerascens community. The CCA ordination indicated that variables of water-table depth and soil moisture are strongly related to community distribution, which explained 81.7% of the vegetation variations. Species diversity indices are significantly positively correlated with soil moisture and negatively correlated with moisture variability, while above- and belowground biomass are positively correlated with moisture. Above- and belowground biomass presen

关键词： water-table depth soil moisture species diversity biomass Gaussian model poyang lake wetland

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Atmospheric correction of HJ-1A/B CCD images over Chinese coastal waters using MODIS-Terra aerosol data

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Science China(Technological Sciences) 2010年第S1期53卷 191-195页

作者： TIAN LiQiao 1,LU JianZhong 1,CHEN XiaoLing 1,2,3,YU ZhiFeng 1,XIAO JingJing 1,QIU Feng 1 & ZHAO Xi 1 1 State key laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China 2key laboratory of poyang lake wetland and watershed research,ministry of education,Jiangxi Normal University,Nanchang 330022,China 3 The key laboratory of poyang lake Environment and Resource Utilization,ministry of education,Nanchang University,Nanchang 330031,China State key laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan China key laboratory of poyang lake wetland and watershed research Ministry of Education Jiangxi Normal University Nanchang China The key laboratory of poyang lake Environment and Resource Utilization Ministry of Education Nanchang University Nanchang China

This paper demonstrates an atmospheric correction method to process HJ-1A/B CCD images over Chinese coastal waters with the aid of MODIS-Terra aerosol *** on the assumption of zero water-leaving radiance at the two near-infrared (NIR)bands or the shortwave infrared(SWIR)bands,the atmospheric aerosol optical depth(AOD)is firstly retrieved from MODIS-Terra with a simple extension of the NIR-SWIR combined atmospheric correction approach embedded in SeaDAS (SeaWiFS data analysis system).Then the"turbid"and"non-turbid"waters are separated by the turbid water *** probability of AOD at 551 nm band is derived based on the NIR information over"non-turbid"waters and FLAASH model is selected to do the atmospheric correction of the HJ-1A/B CCD imagery using the AOD values of highest probabilities as ***,according to the histogram of the AOD distribution at 551 nm band,the studied turbid water area is divided into several blocks and HJ-1A/B CCD imagery is corrected with the corresponding AOD values displayed with the highest frequency in each *** method has been applied to several HJ-1A/B images over Chinese coastal waters and validated by synchronous in-situ *** results have shown that this method is effective in the atmospheric correction process of HJ-1A/B CCD images for ocean color remote sensing study and application in the coastal waters.

关键词： ocean color remote sensing atmospheric correction turbid coastal waters HJ-1A/B MODIS

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Spatial and Temporal Change of Habitat Quality of poyang lake Basin in China at Small watershed Scale and Its Multidimensional Response to Landscape Pattern

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Chinese Geographical Science 2023年第3期33卷 565-582页

作者： BI Manyu ZHONG Yexi XIAO Zeping FENG Xinghua MA Hongzhi School of Geography and Environment Jiangxi Normal UniversityNanchang 330022China key laboratory of poyang lake wetland and watershed research ministry of education(Jiangxi Normal University) Nanchang 330022China

The health and function of ecosystems are largely determined by the quality of habitat,and the optimal regulation of landscape patterns has become an important way to improve regional habitat *** article takes the poyang lake Basin of China as a case,reveals the spatial and temporal change of its habitat quality at the small watershed scale,and attempts to examine the multidimensional response of habitat quality to landscape pattern changes with respect to landscape compositions and landscape *** results show:1)from 2000 to 2020,the overall landscape fragmentation of the basin decreased,the landscape aggregation in the central small watersheds changed significantly,and the spatial distribution of landscape elements in the central and southern small watersheds were relatively homogeneous.2)The overall habitat quality of the poyang lake Basin is at a middle to high level,with significant spatial differentiation,showing the distribution characteristics of‘high in the periphery,low in the center,high in the south and low in the north’.3)Both landscape compositions and landscape configurations influenced habitat quality,but there were obvious differences in the response *** the landscape composition and configuration dimension,the influence of landscape composition on habitat quality was greater than that of landscape configuration;from the multilevel landscape configuration dimension,compared to landscape level,landscape configuration at the class level impacted habitat quality more *** the end,this article proposes a differentiated regulation strategy for habitat quality conservation in small watersheds from the perspective of landscape patterns to improve the ecological service level of poyang lake Basin.

关键词： landscape watershed Spatial

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Atmospheric correction of ocean color imagery over turbid coastal waters using active and passive remote sensing

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Chinese Journal of Oceanology and Limnology 2009年第1期27卷 124-128页

作者：田礼乔陈晓玲张亭禄龚威陈莉琼陆建忠赵羲张伟于之锋 State key laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University The key Lab. of poyang lake Environment and Resource Utilization Ministry of Education Nanchang University The key laboratory of poyang lake wetland and watershed research Ministry of Education Jiangxi Normal University laboratory of Ocean Remote Sensing Ministry of Education Ocean Remote Sensing Institute Ocean University of China

This paper demonstrates an atmospheric correction method to process MODIS/Aqua (Moderate-resolution Imaging Spectroradiometer) ocean color imagery over turbid coastal waters with the aid of concurrent CALIOP (Cloud-Aerosol LIdar with Orthogonal Polarization) aerosol data, assuming that there exists "nonturbid" water in the study area where MODIS aerosol optical properties can be retrieved accurately. Aerosol properties from CALIOP measurements were obtained and related to those from MODIS. This relationship, combined with CALIOP aerosol data, was extended to turbid water to derive MODIS aerosol properties, where atmospheric correction using MODIS data alone often fails. By combining MODIS and CALIOP data, aerosol signals were separated from the total signals at the satellite level, and water-leaving radiances in turbid waters were subsequently derived. This method was tested on several MODIS/Aqua ocean color images over South China turbid waters. Comparison with field data shows that this method was effective in reducing the errors in the retrieved water-leaving radiance values to some extent. In the Zhujiang (Pearl) River Estuary, this method did not overestimate the aerosol effects as severely, and provided far fewer negative water-leaving radiance values than the NASA (National Aeronautics and Space Administration) default methods that used MODIS data alone.

关键词： Ocean color remote sensing atmospheric correction turbid coastal waters CALIOP MODIS

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