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Response of community composition and biomass of submerged macrophytes to variation in underwater light, wind and trophic status in a large eutrophic shallow lake

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Journal of Environmental Sciences 2021年第5期33卷 298-310页

作者： Baili Dong Yongqiang Zhou Erik Jeppesen Kun Shi Boqiang Qin Taihu Laboratory for Lake Ecosystem Research State Key Laboratory of Lake Science and EnvironmentNanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Department of Bioscience Aarhus UniversityVejlsovej 258600 SilkeborgDenmark Sino-Danish Centre for Education and Research(SDC) University of Chinese Academy of SciencesBeijing 100049China Limnology Laboratory Department of Biological Sciences and Centre for Ecosystem Research and ImplementationMiddle East Technical UniversityAnkaraTurkey

Light climate is of key importance for the growth, community composition of submerged macrophytes in lakes and, they, in turn, are affected by lake depth and the degree of eutrophication. To test the relationships between submerged macrophyte presence and the ratio of Secchi disk depth(SDD) to water depth, i.e. SDD/depth, nutrients and wind, we conducted an extensive sampling campaign in a macrophyte-dominated area of the eastern region( n = 36) in 2016 in Lake Taihu, China, and combined the data gathered with results from extensive physico-chemical monitoring data from the entire lake. We confirmed that SDD/Depth is the primary factor controlling the community composition of macrophytes and showed that plant abundance increased with increasing SDD/Depth ratio( p 0.4 ensured growth of submerged macrophytes. Total phosphorus and total nitrogen also influenced the growth and community composition of macrophytes( p 0.05). The key to restore the macrophyte beds in the lake is to reduce the nutrient loading. A decrease of the water level may contribute as well in the shallow bays but will not bring plants back in the main part of the lake. As the tolerance of shade and nutrients varied among the species studied, this should be taken into account in the restoration of lakes by addition of plants.

关键词： Underwater light climate Water depth community composition Macrophyte Eutrophication

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Immediate and legacy effects of snow exclusion on soil fungal diversity and community composition

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Forest Ecosystems 2021年第2期8卷 292-302页

作者： Li Zhang Yuzhi Ren Kaijun Yang Zhijie Li Bo Tan Yang Liu Han Li Chengming You Sining Liu Lixia Wang Rui Yin Jian Zhang Zhenfeng Xu Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River&Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base Institute of Ecology&ForestrySichuan Agricultural UniversityChengdu 611130China Global Ecology Unit CREAF-CSIC-UAB CSIC08193 BarcelonaCataloniaSpain Forschungszentrum Jülich GmbH Agrosphere(IBG-3)JülichGermany Helmholtz-Centre for Environmental Research-UFZ Department of Community EcologyTheodor-Lieser-Strasse 406110 Halle(Saale)Germany

Background:Soil fungi play crucial roles in ecosystem ***,how snow cover change associated with winter warming affects soil fungal communities remains unclear in the Tibetan ***:We conducted a snow manipulation experiment to explore immediate and legacy effects of snow exclusion on soil fungal community diversity and composition in a spruce forest on the eastern Tibetan *** fungal communities were performed by the high throughput sequencing of ***:Ascomycota and Basidiomycota were the two dominant fungal phyla and Archaeorhizomyces,Aspergillus and Amanita were the three most common genera across seasons and snow *** exclusion did not affect the diversity and structure of soil fungal community in both snow-covered and snow-free ***,the relative abundance of some fungal communities was different among *** fungal groups were correlated with environmental factors(i.e.,temperature and moisture)and soil biochemical variables(i.e.,ammonium and enzyme).Conclusions:These results suggest that the season-driven variations had stronger impacts on soil fungal community than short-term snow cover *** findings may have important implications for soil microbial processes in Tibetan forests experiencing significant decreases in snowfall.

关键词： Winter climate change Snow cover Fungi community diversity community composition Illumina sequencing

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The bacterial diversity and community composition altered in the oxygen minimum zone of the Tropical Western Pacific Ocean

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Journal of Oceanology and Limnology 2021年第5期39卷 1690-1704页

作者： Qiqi SUN Jinming SONG Xuegang LI Huamao YUAN Qidong WANG Shandong Peanut Research Institute Qingdao 266100China Key Laboratory of Marine Ecology and Environmental Sciences Institute ofOceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot NationalLaboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao266071China

The oxygen minimum zones(OMZs)are globally expanding,yet the variation pattern of microbial communities related to dissolved oxygen levels remain *** variability of bacterial diversity and community composition(repre sented by 16 S rRNA)of six stations was investigated within the water column in the seamount area of Tropical Western Pacific Ocean(TWPO)in May *** seawater has dissolved oxygen(DO)concentration of 3.01-6.68 mg/L and the core of the oxygen minimum zones was located between the depths of 650 m and 1750 *** bacterial alpha-diversity showed unimodal pattern with the decreasing DO with depths and peaked in the upper oxycline(UO)of *** bacterial community structure of the mixed layer(ML)and the bottom layer clustered and separated from each other,while those of UO and the OMZ core(OM)clustered and ***,bacterial community composition transitioned from being Alphaproteobacteria and Gammaproteobacteria-dominant in ML to being Gammaproteobacteria and Nitrososphaeria/Deltaproteobacteria-dominant in UO and OM,and then changed to being Clostridia and unidentified Actinobacteria-dominant in the bottom ***,both bacterial alpha-diversity and the abundant classes fitted varying sectioned functions with *** DO solely explained 40.37%of the variation of bacterial community composition among layers(Pcommunity composition,and help to clarify the potential responses of microbes and their involved biogeochemical processes to the expansion and intensification of OMZs.

关键词： bacterial diversity community composition oxygen minimum zones(OMZs) dissolved oxygen Tropical Western Pacific Ocean(TWPO)

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Effects of seasonal variations on soil microbial community composition of two typical zonal vegetation types in the Wuyi Mountains

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Journal of Mountain Science 2016年第6期13卷 1056-1065页

作者： WU Ze-yan LIN Wen-xiong LI Jian-ju LIU Jin-fu LI Bai-lian WU Lin-kun FANG Chang-xun ZHANG Zhi-xing Life Sciences College of Fujian Agriculture and Forestry University Fuzhou 350002 China Ecological Complexity and Modeling Laboratory University of California Riverside Riverside CA92507 USA Forestry College of Fujian Agriculture and Forestry University Fuzhou 350002 China Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring School of Life Sciences Fujian Agriculture and Forestry University Fuzhou 350002 China Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University Fuzhou 350002 China

Seasonal shifts play an important role in soil microbial community composition. This study examined the hypothesis that soil microbial community structure would vary with seasonal shifts in the Wuyi Mountains in Southeast China, and that two representative tree species （Castanopisi carlesii and Cunninghamia lanceolata） may have different soil microbial community composition. Phospholipids fatty acid analysis （PLFA） of seasonal shifts and was used to assess the effect vegetation types on soil microbial community structure. A total of 22 different PLFAs were identified from all the soil samples. The bacterial PLFAs accounted for 62.37% of the total PLFAs, followed by fungi （28.94%）, and the minimum was actinomycetes （6.41%）. Overall, the level of PLFAs in C. carlesii soil was greater than those in C. lanceolata soil, and significant differences were observed in some seasons. The amounts of total, bacteria, actinomycic and fungal PLFAs significantly changed with the seasons and followed a sequence order （summer 〉 autumn 〉 spring 〉 winter）. The bacteria/fungi PLFAs and G （＋）/G （-） PLFAs of two vegetation types also changed with the seasons and the ratios in summer and autumn were higher than those in spring and winter. The correlation analysis of microbial PLFAs and soil physicochemical properties showed that the total, bacteria, fungal, actinomycic, G （＋） and G （-） PLFAs were significantly positive correlation with TOC, TN, TP, TK and moisture content. We concluded that the seasonal shifts and vegetation types affect soil microbial community composition by changing the soil physicochemical properties.

关键词： Seasonal shifts Soil microbes community composition Castanopisi carlesii Cunninghamia lanceolata

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Effects of long-term straw incorporation on nematode community composition and metabolic footprint in a rice–wheat cropping system

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Journal of Integrative Agriculture 2021年第8期20卷 2265-2276页

作者： CHEN Yun-feng XIA Xian-ge HU Cheng LIU Dong-hai QIAO Yan LI Shuang-lai FAN Xian-peng Key Laboratory of Fertilization from Agricultural Wastes Ministry of Agriculture and Rural Affairs/Institute of Plant Protection and Soil FertilizerHubei Academy of Agricultural SciencesWuhan 430064P.R.China

Soil nematode communities can provide valuable information about the structure and functions of soil food webs,and are sensitive to agricultural practices,including short-term straw ***,currently,such effects under longterm straw incorporation conditions at different fertility levels are largely ***,we conducted a 13-year ongoing experiment to evaluate the effects of long-term straw incorporation on the structure and functions of the soil food web in low and high fertility soils through analyzing its effects on nematode communities,food web indices and metabolic *** treatments were included:straw removal(–S)under non-fertilized(–NPK)or fertilized(+NPK)conditions;and straw incorporation(+S)under–NPK or+NPK *** samples from a 0–20 cm depth layer were collected when wheat and rice were *** with straw removal,straw incorporation increased the abundances of total nematodes,bacterivores,plant-parasites and omnivores-predators,as well the relative abundances of omnivores-predators with increases of 73.06,89.29,95.31,238.98,and 114.61%in–NPK soils and 16.23,2.23,19.01,141.38,and 90.23%in+NPK soils,*** of sampling times and fertilization effects,straw incorporation increased the diversity and community stability of nematodes,as indicated by the Shannon-Weaver diversity index and maturity *** and structure index did not show significant responses to straw incorporation,but a slight increase was observed in the structure *** analysis of nematode metabolic footprints showed that straw incorporation increased the plant-parasite footprint and structure footprint by 97.27 and 305.39%in–NPK soils and by 11.29 and 149.56%in+NPK soils,but did not significantly influence enrichment,bacterivore and fungivore *** conclusion,long-term straw incorporation,particularly under a low fertility level,favored the soil nematodes and regulated the soil food web mainly via a top-down

关键词： soil nematodes community composition metabolic footprint straw incorporation rice-wheat cropping system top-down effect

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Phytoplankton pigment patterns and community composition in the northern South China Sea during winter

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Chinese Journal of Oceanology and Limnology 2011年第2期29卷 233-245页

作者：翟红昌宁修仁唐学玺郝锵乐凤凤乔静 College of Marine Life Science Ocean University of China Second Institute of Oceanography SOA State Key Lab of Satellite Ocean Environment Dynamics

Phytoplankton pigment patterns and community composition were investigated in the northern South China Sea using high-performance liquid chromatography and the CHEMTAX software from February 11 to 23, 2009. We recognized four different vertical distribution patterns of pigments: chlorophyll a (Chl a)-like type, divinyl chlorophyll a (DV Chl a) type, even distribution type, and surface type. The average value of ratios of accessory photo-protective pigments (APP) to accessory photo-synthetic pigments was 0.89±0.63 in the upper 50 m and 0.16±0.06 below 50 m depth. With increasing depth, APP decreased and photo-synthetically active radiation was attenuated. There was an obvious succession in the phytoplankton community from inshore to the open sea. Diatoms were dominant in the inshore region, while pelagophytes, Prochlorococcus, cyanobacteria and prymnesiophytes were dominant in the open sea. The vertical distribution of phytoplankton also differed greatly from inshore to the open sea. In the coastal and shelf region, diatoms were important components in the whole water column. Cyanobacteria also had a high abundance at the Subsurface Chlorophyll a Maxima (SCM) in the shelf region. In the slope and open sea, Prochlorococcus and cyanobacteria were important groups above the SCM, while pelagophytes dominated below the SCM.

关键词： phytoplankton pigment community composition northern South China Sea HPLC CHEMTAX

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Effect of land use on soil nematode community composition and co-occurrence network relationship

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Journal of Integrative Agriculture 2024年第8期23卷 2807-2819页

作者： Xiaotong Liu Siwei Liang Yijia Tian Xiao Wang Wenju Liang Xiaoke Zhang Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China Tillage and Cultivation Research Institute Liaoning Academy of Agricultural SciencesShenyang 110161China University of Chinese Academy of Sciences Beijing 100049China Key Lab of Conservation Tillage and Ecological Agriculture in Liaoning Province Shenyang 110016China

Land use influences soil biota community composition and diversity,and then belowground ecosystem processes and *** characterize the effect of land use on soil biota,soil nematode communities in crop land,forest land and fallow land were investigated in six regions of northern *** richness,diversity,abundance and biomass of soil nematodes was the lowest in crop *** richness and diversity of soil nematodes were 28.8and 15.1%higher in fallow land than in crop land,*** significant differences in soil nematode indices were found between forest land and fallow land,but their network keystone genera composition was *** the keystone genera,50%of forest land genera were omnivores-predators and 36%of fallow land genera were *** proportion of fungivores in forest land was 20.8%lower than in fallow *** network complexity and the stability were lower in crop land than forest land and fallow *** pH,NH_(4)^(+)-N and NO_(3)^(–)-N were the major factors influencing the soil nematode community in crop land while soil organic carbon and moisture were the major factors in forest *** nematode communities in crop land influenced by artificial management practices were more dependent on the soil environment than communities in forest land and fallow *** use induced soil environment variation and altered network relationships by influencing trophic group proportions among keystone nematode genera.

关键词： soil nematode trophic groups community composition co-occurrence network land use

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Database and primer selections affect nematode community composition under different vegetations of Changbai Mountain

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Soil Ecology Letters 2023年第1期5卷 142-150页

作者： Yixin Sun Xiaofang Du Yingbin Li Xu Han Shuai Fang Stefan Geisen Qi Li CAS Key Laboratory of Forest Ecology Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Nematology Wageningen UniversityWageningenThe Netherlands

High-throughput sequencing technology is increasingly used in the study of nematode ***,the annotation difference of commonly used primers and reference databases on nematode community is still *** compared two pairs of primers(3NDf/C_1132rmod,NF1F/18Sr2bR)and three databases(NT_V20200604,SILVA138/18s Eukaryota and PR2_v4.5 databases)on the determination of nematode community from four different vegetation types in Changbai Mountain,including mixed broadleaf-conifer forest,dark coniferous forest,betula ermanii Cham and alpine *** results showed that the selection of different primers and databases influenced the annotation of nematode taxa,but the diversity of nematode community showed consistent pattern among different vegetation *** findings emphasize that it is necessary to select appropriate primer and database according to the target taxonomic *** difference in primers will affect the result of nematode taxa at different classification levels,so sequencing analysis cannot be used for comparison with studies using different *** terms of annotation effect in this study,3NDf/C_1132rmod primers with NT_v20200604 database could provide more information than other combinations at the genus or species levels.

关键词： Soil nematodes Primer Database High-throughput sequencing community composition

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Estimating areal carbon fixation of intertidal macroalgal community based on composition dynamics and laboratory measurements

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Journal of Oceanology and Limnology 2019年第1期37卷 93-101页

作者： DU Guoying ZHAO Ezi LIU Chunrong TANG Xianghai Key Laboratory of Marine Genetics and Breeding Chinese Ministry of Education College of Marine Life Sciences Ocean University of China

The community dynamics and potential carbon ?xation of intertidal macroalgae were investigated monthly from April 2014 to April 2015 in the northwest coast of Yellow Sea. Seasonal variations in biomass and carbon ?xation were presented and showed close relationship with community *** carbon ?xation rate ranged from 0.48±0.13 mg C/(g FW ·d) to 4.35±0.12 mg C/(g FW ·d). Sargassum thunbergii, Chondrus ocellatus and Ulva intestinalis were three most in?uential species which contributed27%, 21.9% and 18.5% variation of carbon ?xation rate, respectively. Standing carbon stocks ranged from7.52 g C/m^2 to 41.31 g C/m^2, and estimated carbon stocks varied from 11.77 g C/m 2 to 96.49 g C/m^2. The larger dif ference between estimated and standing carbon stocks implied that more ?xed carbon was exported from the community in summer and autumn than in winter. This study suggested that intertidal macroalgal community could provide a potential function in carbon ?xation of coastal ecosystem.

关键词： carbon fxation carbon stock community composition intertidal macroalgae Yellow Sea

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Drought decreases the positive impact of warming on an alpine grassland community

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Science China Earth Sciences 2024年第10期67卷 3226-3238页

作者： Wang A Wangwang LV Yang ZHOU Bowen LI Jianping SUN Jingya LV Lanying CHEN Dorji TSECHEO Shiping WANG Key Laboratory of Tibetan Plateau Earth Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China School of Ecology and Environment Tibet UniversityLhasa 850000China University of the Chinese Academy of Sciences Beijing 100049China

Temperature and precipitation are the main factors determining plant community succession and aboveground net primary productivity(ANPP)in natural ***,most climate manipulative experiments have mainly focused on their impacts in isolation,especially in alpine *** we explored the relative effects and interaction of warming and precipitation alteration on succession and ANPP using a 7-year experiment involving warming with precipitation alteration(increase(IP)or decrease(DP))in precipitation relative to ambient precipitation(AP)on the Tibetan *** results showed that warming and warm-wet conditions increased species richness,diversity index,height and cover of overall ***,decreasing precipitation reduced them,but increased *** and the rate of change in community ***,warming mitigated the impacts of decreased precipitation on plant community composition,and the interactive effects of warming and altered precipitation on cover,height and plant ANPP varied with year and plant ***,warming increased community ANPP through increases in forb ANPP or non-dominant species ANPP and biodiversity regardless of change in ***,decreased precipitation reduced community ANPP via decreases in the ANPP of sedges and forbs and *** alteration affected the relationship between biodiversity and community ANPP regardless of warming(IP

关键词： Alpine grassland Climate warming Precipitation alteration community composition Biodiversity Above-ground net primary productivity

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