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Characterization of Bacterial Community Structure and Diversity in Rhizosphere Soils of Three Plants in Rapidly Changing salt marshes Using 16S rDNA

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Pedosphere 2007年第5期17卷 545-556页

作者： WANG Meng CHEN Jia-Kuan LI Bo Coastal Ecosystems Research Station of Yangtze River Estuary Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering Institute of Biodiversity Science Fudan University 220 Handan Road Shanghai 200433 （China）.

The structure and diversity of the bacterial communities in rhizosphere soils of native Phragmites australis and Scirpus rnariqueter and alien Spartina alterniflora in the Yangtze River Estuary were investigated by constructing 16S ribosomal DNA （rDNA） clone libraries. The bacterial diversity was quantified by placing the clones into operational taxonomic unit （OTU） groups at the level of sequence similarity of 〉 97%. Phylogenetic analysis of the resulting 398 clone sequences indicated a high diversity of bacteria in the rhizosphere soils of these plants. The members of Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, and Deltaproteobacteria of the phylum Proteobacteria were the most abundant in rhizobacteria. Chao 1 nonpaxametric diversity estimator coupled with the reciprocal of Simpson＇s index （l/D） was applied to sequence data obtained from each library to evaluate total sequence diversity and quantitatively compare the level of dominance. The results showed that Phragmites, Scirpus, and Spartina rhizosphere soils contained 200, 668, and 382 OTUs, respectively. The bacterial communities in the Spartina and Phragraites rhizosphere soils displayed species dominance revealed by 1/D, whereas the bacterial community in Scirpus rhizosphere soil had uniform distributions of species abundance. Overall, analysis of 16S rDNA clone libraries from the rhizosphere soils indicates that the changes in bacterial composition may occur concomitantly with the shift of species composition in plant communities.

关键词： 16S rDNA bacterial diversity plant succession rhizosphere salt marshes

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Trophic relationships in the Changjiang River estuarine salt marshes: preliminary investigation from δ^(13)C and δ^(15)N analysis

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Acta Oceanologica Sinica 2009年第3期28卷 50-58页

作者： QUAN Weimin HUANG Danqing CHU Tianjiang SHENG Qiang FU Cuizhang CHEN Jiakuan WU Jihua Coastal Ecosystems Research Station of Yangtze River Estuary Ministry of EducationKey Laboratory for Biodiversity Science and Ecological Engineering Fudan UniversityShanghai 200433 China

To obtain information on food web structure in salt marshes of the Changjiang （Yangtze） River Estuary, the （ δ3C and δ15N values of primary producers and consumers were determined. The mean δ13C values of 31 dominant consumers ranged from -23.13‰ to -14.37‰. Except for several species （ Eriocheir sinensis, Sinonovacula constricta and Potamocorbula ustulata）, consumers had interme- diate δ13C values between those of benthic microalgae and Spartina alterniflora. The mean δ15N values of 31 dominant consumers varied between 6.87‰ and 13.33‰, which indicate three trophic levels in salt marshes of the Changjiang River Estuary. A total of 18 macroinvertebrates species and four fish species represented primary consumers with trophic levels ranging from 2.0 to 2.7. Secondary consumers included two maeroinvertebrates and seven fishes with trophic levels varying between 3.0 and 3.9. The consumers were divided into three trophic guilds, i.e., detritivorous/algae feeders, omnivores and carnivores. The detrital food chain was the main energy flow pathway in the salt marsh food web of the Changjiang River Estuary, and the marsh vascular plants were at least as equally important as microphytobenthos for secondary production. The important trophic function of the salt marsh habitats in the estuary is revealed.

关键词： energy base food web salt marshes stable isotope trophic level Changjiang River Estuary

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Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes

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Fundamental Research 2023年第6期3卷 868-879页

作者： Guangliang Zhang Junhong Bai Jia Jia Wei Wang Dawei Wang Qingqing Zhao Chen Wang Guozhu Chen State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Advanced Institute of Natural Sciences Beijing Normal UniversityZhuhai 519087China Henan Key Laboratory of Ecological Environment Protection and Restoration of Yellow River Basin Yellow River Institute of Hydraulic ResearchZhengzhou 450003China Shandong Provincial Key Laboratory of Applied Microbiology Ecology InstituteQilu University of Technology(Shandong Academy of Sciences)Ji'nan 250103China

Salinity stress is one of the critical environmental drivers of soil organic matter(SOM)decomposition in coastal *** the temperature sensitivity(Q_(10))of SOM decomposition has been widely applied in Earth system models to forecast carbon processes,the impact of salinity on SOM decomposition by restructuring microbial communities remains ***,we conducted a microcosm experiment with soils collected from the coastal salt marsh in the Yellow River Estuary,which is subjected to strong dynamics of salinity due to both tidal flooding and *** setting a gradient of salt solutions,soil salinity was adjusted to simulate salinity stress and soil carbon emission(CO_(2))rate was measured over the *** showed that as salinity increased,the estimated decomposition constants based on first-order kinetics gradually decreased at different *** the 20‰salinity treatments,which doubled the soil salinity,Q_(10)increased with increasing salinity;but higher salinity constrained the temperature-related response of SOM decomposition by inhibiting microbial growth and carbon *** bacteria were more sensitive to salinity stress than fungi,which can be inferred from the response of microbial beta-diversity to changing *** them,the phylotypes assigned to Gammaproteobacteria and Bacilli showed higher salt tolerance,whereas taxa affiliated with Alphaproteobacteria and Bacteroidota were more easily inhibited by the salinity *** fungal taxa belonging to Ascomycota had higher adaptability to the *** the substrate was consumed with the incubation,bacterial competition intensified,but the fungal co-occurrence pattern changed weakly during ***,these findings revealed the threshold effect of salinity on SOM decomposition in coastal salt marshes and emphasized that salt stress plays a key role in carbon sequestration by regulating microbial keystone taxa,metabolisms,and interactions.

关键词： salt marshes Salinity stress Soil organic matter decomposition Temperature sensitivity Threshold effect Microbial community

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Holocene coastal envi ronmental changes in west coast of the Korean Peninsula inferred from salt marshes in Pyeongtaek wetland,Korea

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地球环境学报 2011年第1期 327-327页

作者： YI Sang-heon YANG Dong-Yoon Geologic Environment Division Korea Institute of Geoscience and Mineral Resources Policy and Networking Division Korea Institute of Geoscience and Mineral Resources

Pyeongtaek wetland,whose name means "flat swamp",is a wide flat paleo-swamp formed during the early *** Pyeongtaek wetland is located near the central part of the west coast of the Korean Peninsula,and as it was formed during the early Holocene,this area can be particularly useful for investigating coastal plant community ecological responses to climate change and sea-level *** this study,we attempted to reconstruct the Holocene coastal depositional environment of the Pyeongtaek area in response to sea-level changes,based on agecontrolled pollen and phytoplanktonic algae *** East Asian monsoon-controlled coastal area is an open system that experiences an intensive interplay between oceanic and terrestrial *** ecological response of sensitive terrestrial ecosystems can provide independent data complementing the almost exclusively marine body of ***,coastal-especially intertidal-ecosystems can provide valuable information on past depositional environmental changes because such systems are very sensitive to environmental changes in the sea-continent *** 10400 cal;000 cal a BP,halophytic Chenopodiaceae pollen and marine dinoflagellates indicate the depositional environment was an intertidal *** 8000 cal and 6000 cal a BP,no marine dinoflagellates and abundant meso- to hypersaline salt marshes of Gramineae,with a later increase of mesosaline marshes of Cyperaceae,indicate a transition from intertidal flat to freshwater *** 6000 cal to 4500 cal a BP,aquatic genera and freshwater algae indicate that the study area completely changed to freshwater *** directional sequence in relative abundance of taxa（maximum percentage of pollen of Chenopodiaceae followed by Gramineae,Cyperaceae,and aquatics） suggests a gradational pattern indicative of marked environmental clines typical of intertidal habitats.

关键词： salt marshes coastal environment Holocene wetland Pyeongtaek Korea

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Mercury in sediments and vegetation in a moderately contaminated salt marsh (Tagus Estuary, Portugal)

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Journal of Environmental Sciences 2010年第8期22卷 1151-1157页

作者： Joao Canário Carlos Vale Laurier Poissant Marta Nogueira Martin Pilote Vasco Branco INRB I.P./IPIMAR Av. Brasília Environment Canada Science and Technology Branch

Depth variations of total mercury （Hg） and methylmercury （MeHg） concentrations were studied in cores from non-colonized sediments, sediments colonized by Halimione portulacoides, Sarcocornia fruticosa and Spartina maritima and belowground biomass, in a moderately contaminated salt marsh （Tagus Estuary, Portugal）. Concentrations in belowground biomass exceeded up to 3 （Hg） and 15 （MeHg） times the levels in sediments, and up to 198 （Hg） and 308 （MeHg） times those found in aboveground parts. Methylmercury in colonized sediments reached 3% of the total Hg, 50 times above the maximum values found in non-colonized sediments. The absence of correlations between total Hg concentrations in sediments and the corresponding MeHg levels suggested that methylation was only dependent on the environmental and microbiological factors. The analysis of belowground biomass at high-depth resolution （2 cm） provided evidence that Hg and MeHg were actively absorbed from sediments, with higher enrichment factors at layers where higher microbial activity was probably occurring. The results obtained in this study indicated that the biotransformation of Hg to the toxic MeHg could increase the toxicity of plant-colonized sediments.

关键词： mercury methylmercury salt marshes Tagus Estuary Portugal

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A global synthesis of the effectiveness and ecological impacts of management interventions for Spartina species

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Frontiers of Environmental Science & Engineering 2023年第11期17卷 263-272页

作者： Shengyu Wang Philip A.Martin Yan Hao William J.Sutherland Gorm E.Shackelford Jihua Wu Ruiting Ju Wenneng Zhou Bo Li Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering National Observations and Research Station of Wetland Ecosystems of the Yangtze EstuaryInstitute of Biodiversity Science and Institute of Eco-ChongmingSchool of Life SciencesFudan UniversityShanghai 200438China Biosecurity Research Initiative at St Catharine’s(BioRISC) St Catharine’s CollegeUniversity of CambridgeCambridgeCB21RLUK Conservation Science Group Department of ZoologyUniversity of CambridgeCambridgeCB23QZUK State Key Laboratory of Grassland Agro-Ecosystems and College of Ecology Lanzhou UniversityLanzhou 730000China Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds School of EcologyEnvironment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China Yunnan Key Laboratory of Plant Reproductive AdaptationEvolutionary Ecology and Centre for Invasion BiologyInstitute of BiodiversitySchool of Ecology and Environmental ScienceYunnan UniversityKunming 650504China

Invasions by Spartina species pose serious threats to global coastal *** many studies have examined the effectiveness and ecological impacts of invasive Spartina management,no comprehensive global synthesis has been conducted to assess the effects of management on Spartina per se and on wider ***,we conducted a global meta-analysis of 3,459 observations from 102 studies to quantify the effects of different management interventions(physical,chemical,biological,and integrated control)on Spartina per se and native biodiversity and *** found that physical measures quickly suppressed Spartina but that their effectiveness declined over *** contrast,chemical measures decreased the abundance and growth of Spartina to a lesser degree in the early stage,but the effectiveness increased over *** management measures did not significantly decrease the diversity of native biota on the whole,but native-plant diversity significantly decreased with time after physical *** management measures did not affect abiotic factors *** results support the use of chemical measures to control invasive Spartina,although their effectiveness would depend on the time since the management *** the problem of Spartina regrowth following physical control requires improved *** hold that initial states of invaders and subsequent environmental changes after management interventions should be weighed in evaluating control efficacy.

关键词： Plant invasion Biodiversity Meta-analysis Restoration salt marshes Treatment timing

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The impact of geomorphology of marsh creeks on fish assemblage in Changjiang River estuary

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Chinese Journal of Oceanology and Limnology 2014年第2期32卷 469-479页

作者：金斌松许旺郭立陈家宽傅萃长 Center for Watershed Ecology Institute of Life Science and Key Laboratory of Poyang Lake Environment and Resource UtilizationMinistry of EducationNanchang University Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering Institute of Biodiversity ScienceFudan University State Key Laboratory of Earth Surface Process and Resource Ecology Beijing Normal University

Tidal marshes are an important habitat and nursery area for fi *** the past few decades,rapid economic development in the coastal areas of China has led to the interruption and destruction of an increasing number of tidal *** growing interest in tidal marsh restoration has increased the need to understand the relationship between geomorphological features and fi sh assemblages in the design of marsh restoration *** studied temporal variations in,and the effects of creek geomorphological features on,the estuarine tidal creek fi sh *** modifi ed channel nets,we sampled fi sh monthly from March 2007 to February 2008 from seven tidal creeks along an intertidal channel system in Chongming Dongtan National Nature *** creek geomorphological variables were measured or derived to characterize intertidal creek geomorphological *** Gobiidae,with 10 species,was the most speciesrich *** most abundant fi sh species were Liza affi nis,Chelon haematocheilus,and Lateolabrax *** fi sh community was dominated by juvenile marine transients,which comprised about 80% of the total *** highest abundance of fi sh occurred in June and July,and the highest biomass occurred in *** redundancy analyses demonstrated that depth,steepness,cross-sectional area,and volume signifi cantly affected the fi sh species *** nis favored small creeks with high *** ommaturus,Acanthogobius luridus,and Carassius auratus preferred deep,steep creeks with a large cross-sectional area and *** fi ndings indicate that the geomorphological features of tidal creeks should be considered in the conservation and sustainable management of fi sh species and in the restoration of salt marshes.

关键词： intertidal environment habitat selection geomorphology restoration salt marshes Changjiang (Yangtze) River estuary

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Invading cord grass vegetation changes analyzed from Landsat-TM imageries: a case study from the Wanggang area, Jiangsu coast, eastern China

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Acta Oceanologica Sinica 2010年第3期29卷 26-37页

作者： LI Jing GAO Shu WANG Yaping Key Laboratory of Ministry of Education for Coastal and Island Development Nanjing University Nanjing 210093 China

Cord grass colonization on the Jiangsu coast, eastern China, modifies the native salt marshes in terms of ecosystem structure. The Landsat TM images from 1992 to 2003 were analyzed to identify salt-marsh vegetation distribution patterns and their changes over this coastal region, in order to evaluate the effects of the spreading of the artificially introduced halophyte Spartina. Supervised classification was performed using Bands 3, 4 and 5 in conjunction with in situ training samples, to derive the distribution pattern of the vegetation in the study area. Further, in order to identify the intertidal areas with different tidal elevations, a data treatment procedure was designed to combine regional water level data using harmonic analysis with the waterlines on the TM images extracted by density slice. The results show that：（1） the Spartina alterniflora area has been expanding towards the sea rapidly since it was introduced, especially at initial stages; （2） in the upper part of the inter-tidal zone, the local marsh plant Suaeda salsa and the exotic species Spartina anglica were present only near the sea dyke, occupying only a small part of the entire salt marsh, and the area of these two species has been reduced by land reclamation; （3） there has been a trend for Spartina alterniflora to become the dominant species in the salt marshes in the study area; and （4） the elevation of Spartina alterniflora’s seaward fringe was close to mean high water on neaps, and its landward boundary was slightly higher than mean high water. The salt marsh environment of the study area has been modified rapidly by the Spartina vegetation for the last 12 years.

关键词： tidal flats salt marshes remote sensing vegetation cover Jiangsu coast

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