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Potential Effects of Episodic Deposition on Nutrients and Heavy Metals in Decomposing Litters of Suaeda glauca in Salt Marsh of the Yellow River Estuary, China

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Chinese Geographical Science 2020年第3期30卷 466-482页

作者： CHEN Bingbing sun zhigao Key Laboratory of Humid Subtropical Eco-geographical Process(Fujian Normal University) Ministry of EducationFuzhou 350007China Institute of Geography Fujian Normal UniversityFuzhou 350007China Fujian Provincial Key Laboratory for Subtropical Resources and Environment Fujian Normal UniversityFuzhou 350007China

Episodic deposition has been recognized as a major factor affecting the decomposition rate of detrital material in salt marshes. In this paper, three one-off burial treatments, no burial treatment(0 cm, NBT), current burial treatment(10 cm, CBT) and strong burial treatment(20 cm, SBT), were designed in intertidal zone of the Yellow River Estuary to determine the potential influences of episodic deposition on nutrient(C, N) and heavy metal(Pb, Cr, Cu, Zn, Ni, Mn, Cd, V and Co) variations in decomposing litters of Suaeda glauca. Results showed that although various burial treatments showed no statistical difference in decomposition rate of S. glauca, the values generally followed the sequence of CBT(0.002 403/d) > SBT(0.002 195/d) > NBT(0.002 060/d). The nutrients and heavy metals in decomposing litters of the three burial treatments exhibited different variations except for N, Cu, Cr, Ni and Co. Except for Mn, no significant differences in C, N, Pb, Cr, Cu, Zn, Ni, V and Co concentrations occurred among the three treatments(P > 0.05). With increasing burial depth, Cr and Cd levels generally increased while Cu, Ni and Mn concentrations decreased. Although episodic deposition was generally favorable for C and N release from S. glauca, its influence on release was insignificant. In the three burial treatments, Pb, Cr, Zn, Ni, Mn, V and Co stocks in S. glauca generally evidenced the export of metals from litter to environment, and, with increasing burial depth, the export amounts increased greatly. The S. glauca were particular efficient in binding Cd and releasing Pb, Cr, Zn, Ni, Mn, V and Co, and, with increasing burial depth, stocks of Cu in decomposing litters generally shifted from release to accumulation. The experiment indicated that the potential eco-toxic risk of Pb, Cr, Zn, Ni, Mn, V and Co exposure would be serious as the strong burial episodes occurred in S. glauca marsh.

关键词： decomposition nutrient and metal episodic deposition Suaeda glauca Yellow River Estuary

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Nitrogen cycle of a typical Suaeda salsa marsh ecosystem in the Yellow River estuary

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Journal of Environmental Sciences 2011年第6期23卷 958-967页

作者： Xiaojie Mou zhigao sun Lingling Wang Chuanyuan Wang Key laboratory of Coastal Environment Processes CAS Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

The nitrogen（N） biological cycle of the Suaeda salsa marsh ecosystem in the Yellow River estuary was studied during 2008 to *** showed that soil N had significant seasonal fluctuations and vertical *** N/P ratio（15.73±1.77） of *** was less than 16,indicating that plant growth was limited by both N and *** N absorption coefficient of *** was very low（0.007）,while the N utilization and cycle coefficients were high（0.824 and 0.331,respectively）.The N turnover among compartments of *** marsh showed that N uptake from aboveground parts and roots were 2.539 and 0.622 g/m2,*** N translocation from aboveground parts to roots and from roots to soil were 2.042 and 0.076 g/m2,*** N translocation from aboveground living bodies to litter was 0.497 g/m2,the annual N return from litter to soil was far less than 0.368 g/m2,and the net N mineralization in topsoil during the growing season was 0.033 g/m2.N was an important limiting factor in *** marsh,and the ecosystem was classified as unstable and *** was seemingly well adapted to the low-nutrient status and vulnerable habitat,and the nutrient enrichment due to N import from the Yellow River estuary would be a potential threat to the *** *** nutrient loading might favor invasive species and induce severe long-term degradation of the ecosystem if human intervention measures were not *** N quantitative relationships determined in our study might provide a scientific basis for the establishment of effective measures.

关键词： compartment model nitrogen biological cycle Suaeda salsa Yellow River estuary

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Potential Impacts of Exogenous Nitrogen Enrichment on Distribution and Transfer of Nitrogen in Plant-Soil System of Suaeda salsa Marsh in the Yellow River Estuary, China

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Journal of Ocean University of China 2023年第1期22卷 258-270页

作者： HU Xingyun sun zhigao YU Linying CHEN Bingbing Fujian Provincial Key Laboratory for Subtropical Resources and Environment Fujian Normal UniversityFuzhou 350007China Key Laboratory of Humid Subtropical Eco-Geographical Process(Fujian Normal University) Ministry of EducationFuzhou 350007China Institute of Geography Fujian Normal UniversityFuzhou 350007China

To determine the potential impacts of exogenous nitrogen(N)enrichment on distribution and transfer of N in Suaeda salsa marsh in the Yellow River Estuary,the variations of N in plant-soil system during the growing season were investigated by field N addition *** experiment included four treatments:NN(no N input treatment,0gNm^(−2) yr^(−1)),LN(low N input treatment,3.0 gNm^(−2) yr^(−1)),MN(medium N input treatment,6 gNm^(−2) yr^(−1))and HN(high N input treatment,12 gNm^(−2) yr^(−1)).Results showed that N additions generally increased the contents of total nitrogen(TN),ammonia nitrogen(NH_(4)^(+)-N)and nitrate nitrogen(NO_(3)^(−)-N)in different soil layers and the increasing trend was particularly evident in *** with the NN treatment,the average contents of TN in topsoil in the LN,MN and HN treatments during the growing season increased by 10.85%,30.14%and 43.98%,the mean contents of NH_(4)^(+)-N increased by 8.56%,6.96%and 14.34%,and the average contents of NO_(3)^(−)-N increased by 35.73%,45.99%and 46.66%,*** exogenous N import did not alter the temporal variation patterns of TN contents in organs,the N transfer and accumulation differed among tissues in different *** increasing N import,both the N stocks in soil and plant showed increasing trend and the values in N addition treatments increased by 9.43%–38.22%and 13.40%–62.20%,*** was worth noting that,compared with other treatments,the *** in the MN treatments was very likely to have special response to N enrichment since not only the period of peak growth was prolonged by about 20 days but also the maximum of TN content in leaves was advanced by approximately one *** paper found that,as N loading reached MN level in future,the growth rhythm of *** and the accumulation and transference of N in its tissues would be altered significantly,which might generate great impact on the stability and health of *** marsh ecosystem.

关键词： nitrogen import nitrogen transfer plant-soil system Suaeda salsa Yellow River Estuary

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Emissions of Biogenic Sulfur Gases(H2S,COS)from Phragmites australis Coastal Marsh in the Yellow River Estuary of China

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Chinese Geographical Science 2016年第6期26卷 770-778页

作者： LI Xinhua ZHU Zhenlin YANG Liping sun zhigao Shandong Institute of Agricultural Sustainable Development Jinan 250100China Institute of Geography Fujian Normal UniversityFuzhou 350007China Key Laboratory of Humid Subtropical Eco-geographical Process Fujian Normal UniversityMinistry of EducationFuzhou 350007China

Emissions of biogenic sulfur gases(hydrogen sulfide(H_2S) and carbonyl sulfide(COS)) from Phragmites australis coastal marsh in the Yellow River estuary of China were determined during April to December in 2014 using static chamber-gas chromatography technique with monthly sampling. The results showed that the fluxes of H_2S and COS both had distinct seasonal and diurnal variations. The H_2S fluxes ranged from 0.09 μg/(m^2·h) to 7.65 μg/(m^2·h), and the COS fluxes ranged from –1.10 μg/(m^2·h) to 3.32 μg/(m^2·h). The mean fluxes of H_2S and COS from the P. australis coastal marsh were 2.28 μg/(m^2·h), and 1.05 μg/(m^2·h), respectively. The P. australis coastal marsh was the emission source of both H_2S and COS over the whole year. Fluxes of H_2S and COS were both higher in plant growing season than in the non-growing season. Temperature had a dramatic effect on the H_2S emission flux, while the correlations between COS flux and the environmental factors were not found during sampling periods. More in-depth and comprehensive research on other related factors, such as vegetation, sediment substrates, and tidal action is needed to discover and further understand the key factors and the release mechanism of sulfur gases.

关键词： biogenic sulfur gases hydrogen sulfide carbonyl sulfide emission flux Phragmites australis coastal marsh the Yellow River estuary

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Responses of CH_4 Emissions to Nitrogen Addition and Spartina alterniflora Invasion in Minjiang River Estuary, Southeast of China

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Chinese Geographical Science 2014年第5期24卷 562-574页

作者： MOU Xiaojie LIU Xingtu TONG Chuan sun zhigao Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Centre of Wetlands in Sub-tropical Regions Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education Fujian Normal University Key laboratory of Coastal Environment Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences

The nitrogen （N） input and Spartina alterniflora invasion in the tidal marsh of the southeast of China are increasingly serious. To evaluate CH4 emissions in the tidal marsh as affected by the N inputs and S. alterniflora invasion, we measured CH4 emissions from plots with vegetated S. alterniflora and native Cyperus malaccensis, and fertilized with exogenous N at the rate of 0 （NO）, 21 （N1） and 42 （N2） g N/（***）, respectively, in the Shanyutan marsh in the Minjiang River estuary, the southeast of China. The average CH4 fluxes during the experiment in the C. malaccensis and S. alterniflora plots without N addition were 3.67 mg CHa/（m2.h） and 7.79 mg CH4/（m2-h）, respectively, suggesting that the invasion of S. alterniflora into the Minjiang River estuary stimulated CH4 emission. Exogenous N had positive effects on CH4 fluxes both in native and in invaded tidal marsh. The mean CH4 fluxes of NI and N2 treat- ments increased by 31.05% and 123.50% in the C. malaccensis marsh, and 63.88% and 7.55% in the S. alterniflora marsh, respectively, compared to that of NO treatment. The CH4 fluxes in the two marshes were positively correlated with temperature and pH, and nega- tively correlated with electrical conductivity and redox potential （Eh） at different N addition treatments. While the relationships between CH4 fluxes and environmental variables （especially soil temperature, pH and Eh at different depths） tended to decrease with N additions. Significant temporal variability in CH4 fluxes were observed as the N was gradually added to the native and invaded marshes. In order to better assess the global climatic role of tidal marshes as affected by N addition, much more attention should be paid to the short-term temporal variability in CH4 emission.

关键词： nitrogen addition CH4 emission tidal marsh Spartina alterniflora invasion temporal variability

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Bupi Hewei decoction ameliorates 5-fluorouracil-induced intestinal dysbiosis in rats through T helper 17/T regulatory cell signaling pathway

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Journal of Traditional Chinese Medicine 2020年第1期40卷 38-48页

作者： sun zhigao Hu Yazhuo Wang Yuguo Feng Jian Dou Yongqi Department of Traditional Chinese Medicine Chinese PLA General HospitalBeijing 100853China&Department of Traditional Chinese MedicineHainan Branch of Chinese PLA General HospitalSanya 572013China Institute of Gerontology Chinese PLA General HospitalBeijing 100853China Department of Traditional Chinese Medicine Chinese PLA General HospitalBeijing 100853China

OBJECTIVE:To observe the effects of the Bupi Hewei(BPHW)decoction on diarrhea and intestinal flora disorder induced by 5-fluorouracil(5-FU)and investigate the possible mechanism underlying these ***:Thirty-five male Sprague-Dawley rats were randomly divided into four groups:normal control,5-FU,5-FU+BPHW decoction(10.5 g/kg for 5 consecutive days),and 5-FU+Bacillus licheni-formis capsule groups(0.2 g/kg for 5 consecutive days).Animal models were established via the intraperitoneal injection of 5-FU(30 mg/kg for 5 consecutive days).At the end of the treatment period,diarrhea was assessed,and the change of the intestinal flora was examined using 16 S r DNA highthroughput ***(IL)-17,IL-21,IL-6,IL-10,RAR-related orphan receptor gamma(RORγt),and forkhead box P3(Foxp3)expression in the jejunum was detected using immunohistochemistry,quantitative real-time polymerase chain reaction(PCR),Western blotting,and enzymelinked immuno sorbent ***:In this study,the BPHW decoction effectively lowered the diarrhea score,increased the proportions of Bacteroidetes and Prevotellaceae-Alloprevotella species,and reduced the proportions of Proteobacteria,Escherichia-Shigella,Ruminococcaceae NK4 A214,and Ruminococcaceae UCG-005 species in the rat intestine after 5-FU *** addition,the BPHW decoction significantly suppressed the expression of IL-17,IL-21,IL-6,IL-10,RORγt,and Foxp3 in the ***:Our findings suggest that the BPHW decoction can improve the intestinal immune balance and reduce intestinal inflammation by targeting T helper cell/T regulatory cell-associated factors.

关键词： Gastrointestinal microbiome Fluorouracil Drug therapy T-Lymphocytes,regulatory Th17 cells Bupi Hewei decoction

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Spatial Variation and Risk Assessment of Arsenic and Heavy Metals in Surface Water and Suspended Particulate Matter in Tail Reaches of the Yellow River, China

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Chinese Geographical Science 2021年第1期31卷 181-196页

作者： sun zhigao LI Jing TIAN Liping CEHN Bingbing HU Xingyun Key Laboratory of Humid Subtropical Eco-geographical Process(Fujian Normal University) Ministry of EducationFuzhou 350007China Institute of Geography Fujian Normal UniversityFuzhou 350007China Fujian Provincial Key Laboratory for Subtropical Resources and Environment Fujian Normal UniversityFuzhou 350007China

To determine the pollution levels and potential toxic risks of arsenic(As) and heavy metals(Cr, Ni, Cu, Zn, Pb and Cd) in water and suspended particulate matter(SPM) in tail reaches(including freshwater reach and low-salinity reach) of the Yellow River as the Flow-Sediment Regulation Project(FSRP) has been carried out for approximately 15 yr, the surface water and SPM were sampled at pre-flood(April) and post-flood seasons(October). Results showed that similar changes of As and metal levels in water and SPM were observed along the tail reaches at pre-flood or post-flood season. Compared to pre-flood season, the levels of As, Cu, Cr and Ni in freshwater reach and the concentrations of Cr and Ni in low-salinity reach rose greatly at post-flood season. The levels of As and metals in SPM of freshwater reach or low-salinity reach at pre-flood season were significantly higher than those at post-flood season(P < 0.01).The pollutions of As and metals in surface water of tail reaches at pre-flood or post-flood season were not serious. The SPM in freshwater reach at pre-flood season were polluted by Cd, As, Cr, Cu and Ni while those in low-salinity reach were polluted by Cd and Cr. The SPM in freshwater reach at post-flood season were polluted by Cd and Pb while those in low-salinity reach were polluted by Cd and *** was identified as heavy metal of primary concern at both pre-flood and post-flood seasons. Combined with the existed data reported in present research, this study found that the toxic risk of As and metals in SPM of tail reaches at pre-flood season was higher than that at post-flood season, implying that the implementation of FSRP during flooding season, to a great extent, reduced the toxic risk of these elements. With the long-term implementation of FSRP, the pollution levels of As and metals(particularly for Cd) in SPM of tail reaches might be elevated and the potential toxic risk primarily produced by Cr, Ni and As might be increased if effective measures we

关键词： arsenic and heavy metals surface water suspended particulate matter tail reaches Yellow River

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Nitrogen Biological Cycle Characteristics of Seepweed(Suaeda salsa) Wetland in Intertidal Zone of Huanghe(Yellow) River Estuary

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Chinese Geographical Science 2012年第1期22卷 15-28页

作者： sun zhigao MOU Xiaojie sun Jingkuan SONG Hongli YU Xiang WANG Lingling JIANG Huanhuan sun Wanlong sun Wenguang Shandong Key Laboratory for Eco-Environmental Science of Yellow River Delta Coastal Wetland Ecological Research Base of Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Binzhou 256603 China Key Laboratory of Coastal Environment Processes of Chinese Academy of Sciences Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

From April 2008 to November 2009, the nitrogen （N） cycle of plant-soil system in seepweed （Suaeda salsa） wetland in the intertidal zone of the Huanghe （Yellow） River estuary was studied. Results showed that soil N had sig- nificant seasonal fluctuations and vertical distribution, and the net N mineralization rates in topsoil were significantly different in growing season （p 〈 0.01）. The N/P ratio （9.87 ±1.23） of S. salsa was less than 14, indicating that plant growth was limited by N. The N accumulated in S. salsa litter at all times during decomposition, which was ascribed to the N immobilization by microbes from the environment. Soil organic N was the main N stock of plant-soil system, accounting for 97.35% of the total N stock. The N absorption and utilization coefficients of S. salsa were very low （0.0145 and 0.3844, respectively）, while the N cycle coefficient was high （0.7108）. The results of the N turnovers among compartments of S. salsa wetland showed that the N uptake amount of aboveground part and root were 7.764 g/m2and 4.332 g/m2, respectively. The N translocation amounts from aboveground part to root and from root to soil were 3.881 g/m2 and 0.626 g/m2, respectively. The N translocation amount from aboveground living body to litter was 3.883 g/m2, the annual N return amount from litter to soil was more than 0.125（-） g/m2 （minus represented immobili- zation）, and the net N mineralization amount in topsoil （0-15 cm） in growing season was 1.190 g/m2. The assessment of N biological cycle status orS. salsa wetland indicated that N was a very important limiting factor and the ecosystem was situated in unstable and vulnerable status. The S. salsa was seemingly well adapted to the low-nutrient status and vulnerable habitat, and the N quantitative relationships determined in the compartment model might provide scientific base for us to reveal the special adaptive strategy orS. salsa to the vulnerable habitat in the following studies.

关键词： nitrogen biological cycle seepweed wetland Huanghe (Yellow) River estuary

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Application of Stable Isotope Techniques in Studies of Carbon and Nitrogen Biogeochemical Cycles of Ecosystem

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Chinese Geographical Science 2011年第2期21卷 129-148页

作者： sun zhigao MOU Xiaojie LI Xinhua WANG Lingling SONG Hongli JIANG Huanhuan Key Laboratory of Coastal Environment Processes of Chinese Academy of Sciences Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Shandong Institute of Agriculture Sustainable Development Jinan 250100 China

Stable isotope techniques have been proved useful as tools for studying the carbon (C) and nitrogen (N) biogeochemical cycles of ecosystem. This paper firstly introduced the basic principles and the distribution characteristics of stable isotope, then reviewed the recent advances and applications of stable isotope in the C and N biogeochemical cycles of ecosystem. By applying the 13 C natural abundance technique, ecologists are able to understand the photosynthetic path and CO 2 fixation of plants, the CO 2 exchange and C balance status of ecosystem, the composition, distribution and turnover of soil organic C and the sources of organic matter in food webs, while by using the 13 C labeled technique, the effects of elevated CO 2 on the C processes of ecosystem and the sources and fate of organic matter in ecosystem can be revealed in detail. Differently, by applying the 15 N natural abundance technique, ecologists are able to analyze the biological N 2 -fixation, the N sources of ecosystem, the N transformation processes of ecosystem and the N trophic status in food webs, while by using the 15 N labeled technique, the sources, transformation and fate of N in ecosystem and the effects of N input on the ecosystem can be investigated in depth. The applications of both C and N isotope natural abundance and labeled techniques, combined with the elemental, other isotope ( 34 S) and molecular biomarker information, will be more propitious to the investigation of C and N cycle mechanisms. Finally, this paper concluded the problems existed in current researches, and put forward the perspective of stable isotope techniques in the studies on C and N biogeochemical cycles of ecosystem in the future.

关键词： stable isotope isotope fractionation isotope natural abundance biogeochemical cycle carbon nitrogen

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Effects of Anthropogenic Disturbance on Sediment Organic Carbon Mineralization Under Different Water Conditions in Coastal Wetland of a Subtropical Estuary

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Chinese Geographical Science 2018年第3期28卷 400-410页

作者： MOU Xiaojie LIU Xingtu sun zhigao TONG Chuan HUANG Jiafang WAN Siang WANG Chun WEN Bolong Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Institute of Geography Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education Fujian Normal University

The changes in soil organic carbon(C) mineralization as affected by anthropogenic disturbance directly determine the role of soils as C source or sink in the global C budget. The objectives of this study were to investigate the effects of anthropogenic disturbance(aquaculture pond, pollutant discharge and agricultural activity) on soil organic C mineralization under different water conditions in the Minjiang River estuary wetland, Southeast China. The results showed that the organic C mineralization in the wetland soils was significantly affected by human disturbance and water conditions(P aquaculture pond sediment > soil near the discharge outlet > rice paddy soil. This indicated that human disturbance inhibited the mineralization of C in soils of the Minjiang River estuary wetland, and the inhibition increased with the intensity of human disturbance. The data for cumulative mineralized CO_2-C showed a good fit(R^2 > 0.91) to the first-order kinetic model C_t = C_0(1 – exp(–kt)). The kinetic parameters C_0, k and C_0 k were significantly affected by human disturbance and water conditions. In addition, the total amount of mineralized C(in 49 d) was positively related to C_0, C_0 k and electrical conductivity of soils. These findings indicated that anthropogenic disturbance suppressed the organic C mineralization potential in subtropical coastal wetland soils, and changes of water pattern as affected by human activities in the future would have a strong influence on C cycling in the subtropical estuarine wetlands.

关键词： human disturbance carbon mineralization water conditions coastal wetland

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