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Effects of nutrient limitations on the sinking velocity of Thalassiosira weissflogii

Acta Oceanologica Sinica 2024年第6期43卷 163-172页

作者： Jie Zhu Qiang Hao Wei Zhang Yingying Ma jiangning zeng Ocean College Zhejiang UniversityZhoushan 316000China Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China Key Laboratory of Marine Ecosystem Dynamics Ministry of Natural ResourcesHangzhou 310012China Zhejiang Key Laboratory of Nearshore Engineering Environment and Ecological Security Hangzhou 310012China Tianjin Key Lab of Aqua-Ecology and Aquaculture College of FisheriesTianjin Agricultural UniversityTianjin 300384China

The sinking of diatoms is critic al to the formation of oceanic biological pumps and coastal hypoxic ***,little is known about the effects of different nutrient restrictions on diatom *** this study,we measured the sinking velocity(SV) of Thalassiosira weissflogii using a new phytoplankton video observation instrument and analyzed major biochemical components under varying nutrient *** results showed that the SV of *** under different nutrient limitation conditions varied *** highest SV of(1.77±0.02) m/d was obtained under nitrate limitation,signific antly surpassing that under phosphate limitation at(0.98±0.13) m/*** the nutrient limitation was released,the SV steadily decreased to(0.32±0.03) m/d and(0.15±0.05) m/d,***;under conditions with limited nitrate and phosphate concentrations,the SV values of *** significantly positively correlated with the lipid content(P <0.001),with R~2 values of 0.86 and 0.69,*** change of the phytoplankton SV was primarily related to the intracellular compo sition,which is controlled by nutrient conditions but did not significantly correlate with transparent extracellular polymer and biosilica *** results of this study help to understand the regulation of the vertical sinking process of diatoms by nutrient restriction and provide new insights into phytoplankton dynamics and their relationship with the marine nutrient structure.

关键词： nutrient limitation Thalassiosira weissflogii sinking velocity biochemical component lipid content

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Salinity fronts shape spatial patterns in zooplankton distribution in Hangzhou Bay

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Acta Oceanologica Sinica 2024年第6期43卷 96-106页

作者： Yepeng Xu Yiqi Wang Lin Zhan Yijun Ou Kangning Jia Ming Mao Xuyu Zhu Zhibing Jiang Yuanli Zhu Wei Huang Ping Du jiangning zeng Lu Shou Feng Zhou Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Key Laboratory of Nearshore Engineering Environment and Ecological Security of Zhejiang Province Hangzhou 310012China State Key Laboratory of Satellite Ocean Environment Dynamics Ministry of Natural ResourcesHangzhou 310012China Nantong Marine Environmental Monitoring Center Ministry of Natural ResourcesNantong 226002China Key Laboratory of Ocean Space Resource Management Technology Ministry of Natural ResourcesHangzhou 310012China Observation and Research Station of Marine Ecosystem in the Yangtze River Delta Ministry of Natural ResourcesZhoushan 316021China

Ocean fronts play important roles in nutrient transport and in the shaping ecological *** zones in small bays are typically small in scale,have a complex structure,and they are spatially and temporally variable,but there are limited data on how biological communities respond to this *** Bay,a mediumsized estuary in China,is an ideal place in which to study the response of plankton to small-scale ocean fronts,because three water masses(Qiantang River Diluted Water,Changjiang River Diluted Water,and the East China Sea current) converge here and form dynamic salinity fronts throughout the *** investigate zooplankton communities,and temperature,salinity and chlorophyll a(Chl a) in Hangzhou Bay in June(wet perio d) and December(dry period) of 2022 and examine the dominant environmental factors that affect zooplankton community spatial *** then match the spatial distributions of zooplankton communities with those of salinity fronts.S alinity is the most important explanatory variable to affect zooplankton community spatial variability during both wet and dry periods,in that it contributes>60% of the variability in community ***,the spatial distributions of zooplankton match well with salinity *** December,with weaker Qiantang River Diluted Water and a stronger secondary Changjiang River Plume,zooplankton communities occur in moderate salinity(MS,salinity range 15.6±2.2) and high salinity(HS,22.4±1.7) regions,and their ecological boundaries closely match the Qiantang River Diluted Water *** June,different zooplankton communities occur in low salinity(LS,3.9±1.0),MS(11.7±3.6) and HS(21.3±1.9) *** the LS region occurs abnormally in the central bay rather than its apex because of the anomalous influence of rising and falling tides during the sampling perio d,the ecological boundaries still match salinity ***-salinity or brackish-water zooplankter taxa are relatively more abunda

关键词： zooplankton spatial distribution salinity fronts Hangzhou Bay

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甬江口浮游植物时空分布特征及驱动因子

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应用生态学报 2024年第5期35卷 1369-1378页

作者：欧奕君江志兵徐满秋于培松杜伟王德刚蒋雨露曾江宁浙江大学海洋学院浙江舟山316021 自然资源部第二海洋研究所自然资源部海洋生态系统动力学重点实验室杭州310012 浙江省近海海洋工程环境与生态安全重点实验室杭州310012 浙江省海洋科学院自然资源部海洋空间资源管理技术重点实验室杭州310012 自然资源部长三角海洋生态环境科学野外观测研究站浙江舟山316021

为探究小型河口浮游植物群落的时空变化特点,于丰水期、平水期及枯水期采集甬江口表层水样,分析浮游植物的主要驱动因子。结果表明:共检出浮游植物9门123属358种,丰水期、平水期和枯水期物种数分别为276、154和151种,丰度分别为(170.45... 详细信息

为探究小型河口浮游植物群落的时空变化特点,于丰水期、平水期及枯水期采集甬江口表层水样,分析浮游植物的主要驱动因子。结果表明:共检出浮游植物9门123属358种,丰水期、平水期和枯水期物种数分别为276、154和151种,丰度分别为(170.45±225.43)×10~3、(51.92±30.28)×10~3和(31.65±12.79)×10^(3)cells·L^(-1)。浮游植物群落以硅藻为主,优势种有梅尼小环藻、中肋骨条藻、具槽帕拉藻等。Shannon多样性指数与Pielou均匀度指数在丰水期由口门内向口门外呈下降趋势,在平水期和枯水期空间差异较小。多维尺度分析和相似性分析表明,不同区域(口门内、口门和口门外)与不同水文期的浮游植物群落组成均差异显著。相关性分析表明,在丰水期,浮游植物丰度与温度、溶解无机氮、活性磷酸盐呈显著正相关,与盐度呈显著负相关;在平水期,丰度与温度呈显著负相关;在枯水期,丰度与环境因子无明显相关性。冗余分析表明,温度、盐度、铵氮和活性磷酸盐分别解释了浮游植物群落变化的19.5%、11.9%、9.4%和8.2%。甬江口浮游植物群落以硅藻主导,温度、盐度和营养盐是其主要驱动因子。

关键词：甬江口浮游植物群落结构环境因子冗余分析

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2021—2022年春、秋季嵊泗列岛浮游植物群落状况及长期变化特征

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生态学报 2024年第13期44卷 5867-5881页

作者：詹琳江志兵杜伟孙振皓王德刚蒋雨露杜萍李宏亮曾江宁自然资源部第二海洋研究所自然资源部海洋生态系统动力学重点实验室杭州310012 浙江省海洋科学院自然资源部海洋空间资源管理技术重点实验室杭州310012 浙江省近海海洋工程环境与生态安全重点实验室杭州310012 自然资源部长三角海洋生态环境科学野外观测研究站舟山316021

为更好地了解嵊泗列岛海域在人类活动和气候变暖影响下的生态现状以及变化特征,于2020年秋季和2021年春季在该海域进行了浮游植物的拖网与水样采集及环境要素分析。水采样品中共检出浮游植物6门54属105种。其中,硅藻33属68种,甲藻14属30... 详细信息

为更好地了解嵊泗列岛海域在人类活动和气候变暖影响下的生态现状以及变化特征,于2020年秋季和2021年春季在该海域进行了浮游植物的拖网与水样采集及环境要素分析。水采样品中共检出浮游植物6门54属105种。其中,硅藻33属68种,甲藻14属30种,蓝藻、金藻和隐藻各2属2种,绿藻1属1种。春、秋季浮游植物主要优势种为骨条藻(Skeletonema spp.),并在秋季占据绝对优势(Y=0.975)。春季平均细胞丰度[(7.17±7.78)个/mL]明显低于秋季[(77.23±73.44)个/mL]。春季Shannon-Wiener多样性指数和Pielou均匀度指数均高于秋季。Spearman相关分析表明,浮游植物丰度与水温和透明度呈显著正相关,与盐度呈显著负相关。冗余分析显示,浮游植物群落组成与水温、营养盐密切相关。网采样品中共检出浮游植物4门46属94种,硅藻占比最大;春、秋季平均细胞丰度分别为838.17×10^(3)和19406.43×10^(3)个/m^(3)。与水样相比,骨条藻仍为主要优势种,且优势度更高;网采获得的秋季多样性指数和均匀度指数(分别为0.23和0.05)低于水采(分别为0.38和0.10)。将本次网采结果与1990年、2007年调查资料对比发现,嵊泗列岛春、秋季浮游植物群落组成发生了明显改变:丰度明显升高,硅甲藻占比无明显变化,暖水种种类数明显增加,骨条藻优势地位增强,多样性指数和均匀度指数下降。这可能与变暖与富营养化加剧相关。近30年来,溶解无机氮在春季无显著变化,但在秋季显著升高;活性磷酸盐浓度在春、秋季均显著降低;氮磷比在春、秋季均显著升高。浮游植物的变化特征较好地指示了嵊泗列岛海域在富营养化和气候变暖下的生态环境变化。

关键词：嵊泗列岛浮游植物环境因子富营养化长期变化

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全球海岸带国家蓝碳资源价值与类型研究

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应用海洋学学报 2024年第1期43卷 1-11页

作者：冯翠翠龚语嫣叶观琼曾江宁唐剑武方秦华杜建国浙江大学海洋学院浙江舟山316021 自然资源部第二海洋研究所、自然资源部海洋生态系统动力学重点实验室浙江杭州310012 华东师范大学河口海岸学国家重点实验室上海200241 厦门大学环境与生态学院福建厦门361102 自然资源部第三海洋研究所福建厦门361005

海岸带蓝碳生态系统已成为应对气候变化重要的基于自然的解决方案。本研究梳理了全球海岸带蓝碳生态系统的分布、碳封存量和封存价值,并根据经济、科技、蓝碳封存量三个指标对各海岸带国家和地区进行分类。海岸带蓝碳生态系统分布最广... 详细信息

海岸带蓝碳生态系统已成为应对气候变化重要的基于自然的解决方案。本研究梳理了全球海岸带蓝碳生态系统的分布、碳封存量和封存价值,并根据经济、科技、蓝碳封存量三个指标对各海岸带国家和地区进行分类。海岸带蓝碳生态系统分布最广的国家是澳大利亚、印度尼西亚、墨西哥和美国,而印度尼西亚、澳大利亚、马来西亚和巴西碳埋藏量最高。全球每年蓝碳埋藏价值在碳交易和碳税价格下分别为3.47×109美元和2.35×109美元。中国拥有丰富的海岸带蓝碳资源,生态系统面积排名第10,年封存量排名第21;然而蓝碳自然资源的赋存禀赋与现有碳价格体系下的价值匹配性较差,基于碳交易价格的中国海岸带蓝碳埋藏价值全球排名第27,基于碳税价格仅排名第39。碳价格低迷将会导致在国际蓝碳交易中处于劣势,中国后续应不断完善碳排放交易市场。中国具有在蓝碳研究以及修复投入与实践方面的优势,以及贝藻养殖、海洋牧场等特色蓝碳资源,可结合不同类型的蓝碳国家经济科技条件与自然条件制定多元合作策略。

关键词：海洋环境科学海岸带蓝碳生态系统碳达峰基于自然的解决方案国际合作

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“双碳”背景下宁波市海洋碳汇发展路径研究

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自然资源情报 2024年第2期 33-38页

作者：宋蝶钱利炜胡秋成陈丽君李洁曾江宁浙江省发展规划研究院浙江杭州310030 自然资源部第二海洋研究所浙江杭州310012

作为地球上最大的“碳库”,海洋具有巨大的储碳潜力。海洋碳汇发展对于实现碳达峰碳中和目标具有重要意义。宁波市是海洋大市,“双碳”背景下海洋碳汇发展是宁波的突出优势和特色所在,是实现宁波“双碳”目标的重要方式。本文总结归纳... 详细信息

作为地球上最大的“碳库”,海洋具有巨大的储碳潜力。海洋碳汇发展对于实现碳达峰碳中和目标具有重要意义。宁波市是海洋大市,“双碳”背景下海洋碳汇发展是宁波的突出优势和特色所在,是实现宁波“双碳”目标的重要方式。本文总结归纳海洋碳汇发展情况,科学研判宁波市海洋碳汇发展条件和存在的问题,在此基础上,提出海洋碳汇发展路径,拟为宁波实现海洋碳汇能力提升、助力“双碳”目标实现等提供参考借鉴。

关键词：海洋碳汇碳达峰碳中和发展路径价值实现

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Sustainable Utilization of Agricultural Straw for Harmful Algal Blooms Control:A Review

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Journal of Renewable Materials 2020年第5期8卷 461-483页

作者： Kokoette Effiong Jing Hu Caicai Xu Tao Tang Haomin Huang jiangning zeng Xi Xiao Ocean College Zhejiang UniversityZhouShan316021China School of Environment and Energy South China University of TechnologyGuangzhou510006China Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China Key Laboratory of Marine Eco-monitoring and Remediation Technology Ministry of Natural ResourcesShanghai200137China

The use of agricultural straw for algal bloom control has been studied for more than 30 *** this article,we have reviewed the promising potentials of using agricultural straw as source of anti-algal agents,including the effectiveness of each major straw type so far used in this regard,and the investigated algal *** pre-treatment methods have also been widely *** progress has been made in natural product chemistry and molecular biology with regards to agricultural straw,especially in relation to the extraction of antialgal allelochemicals,degradation processes of agricultural straws and the mechanisms through which these inhibitions *** development of biotechnologies using agricultural straw to successfully inhibit growth of bloom forming algae has been generally accepted as environmentally *** current research status and that of the future should include isolation and discovery of antialgal allelochemicals,development of models that would illustrate the sequence of physiologic events that match the species-specific inhibitor phenomenon,and products fit in the field applications.

关键词： Agricultural straw eutrophication harmful algal blooms allelochemicals algal inhibition bioremediation

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Seasonal and regional diff erences in long-term changes in large mesozooplankton(>505μm)biomass and abundance in a semi-enclosed subtropical bay

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Journal of Oceanology and Limnology 2021年第6期39卷 2281-2294页

作者： Ping DU Zhibing JIANG Yuanli ZHU Yibo LIAO Quanzhen CHEN jiangning zeng Lu SHOU Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural Resources(MNR)Hangzhou 310012China Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Ocean Space Resource Management Technology MNRHangzhou 310012China

Obvious spatiotemporal heterogeneity is a distinct characteristic of ecosystems in subtropical *** aid targeted management and ecological restoration in long and narrow semi-enclosed subtropical bays,we analyzed seasonal and regional differences in long-term changes(1980-2019)in the biomass and abundance of large mesozooplankton(LMZ;>505μm)in Xiangshan Bay,Zhejiang,*** found spatiotemporal heterogeneity in the historical changes of *** negative trends in LMZ biomass were found in the inner and middle bay during the warm season(summer and autumn),when the nutrient concentration(especially dissolved inorganic nitrogen)and temperature increased *** changes in Xiangshan Bay began in the late 1980s or early 1990s,coinciding with large-scale fish cage development.A rapid decline in LMZ biomass occurred after 2005 when power plants commenced operation,accelerating the warming ***,the joint stress of eutrophication and warming likely precipitated the decline in LMZ ***,a significant increase in LMZ biomass was found in the outer bay in *** trend was consistent with the trend of LMZ biomass near the Changjiang(Yangtze)River estuary,which indicates that the pelagic ecosystem in the outer bay was aff ected by water from the Changjiang River estuary during *** on our results,ecosystem management and restoration in semi-enclosed subtropical bays should focus on internal waters,which have a poor capacity for water *** Xiangshan Bay,the changes in the Changjiang River estuary ecosystem during the cold season(winter and spring)should also be considered.

关键词： large mesozooplankton long-term changes spatiotemporal heterogeneity Xiangshan Bay

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Seasonal Variations of Net-Phytoplankton Community Structure in the Southern Yellow Sea

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Journal of Ocean University of China 2013年第4期12卷 557-567页

作者： GAO Yu JIANG Zhibing LIU Jingjing CHEN Quanzhen zeng jiangning HUANG Wei Second Institute of Oceanography State Oceanic Administration Laboratory of Marine Ecosystem and Biogeo-chemistry State Oceanic Administration Key Laboratory of Applied Marine Biotechnology Ministry of Education Marine College of Ningbo University

Based on the field survey data of four cruises in 2011,all phytoplankton communities in the southern Yellow Sea (SYS) were investigated for the species composition,dominant species,abundance and diversity indices.A total of 379 species belonging to9 phyla were identified,of which the most abundant group was Bacillariophyta (60.9%) ,followed by Pyrrophyta (23.7%) and Haptophyta (6.9%) .The seasonal distribution of abundance was:summer (4137.1×103ind m 3) >spring (3940.4×103ind m 3) >winter (3010.6×103ind m 3) >autumn (340.8×103ind m 3) ,while the horizontal distribution showed a decreasing tendency from inshore to offshore *** dominant species of phytoplankton varied in different *** dominant species were Thalassiosira pacifica,Skeletoema *** Chaetoceros cinctus in spring,Chaetoceros debbilis,Chaetoceros pseudocurvisetus and Chaetoceros curvisetus in summer,Thalassiosira curviseriata,Alexandrium catenella and Ceratium fusus in autumn,Paralia sulcata,Phaeocystis *** Bacillaria paradoxa in winter,*** SYS,the group of temperate coastal species was the major ecotype,and the groups of the central SYS species and oceanic species were also important *** average values of Shannon-Weaver diversity index (H’) and Pielou evenness index (J) were 2.37 and 0.65 *** indices H’and J in the open sea were higher than those in coastal *** co-variation tendencies between H’and J were observed in all but the summer cruise of this survey.

关键词：季节变化植物群落结构南黄海浮游植物群落多样性指数沿海水域球形棕囊藻均匀度指数

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The Ecological Distributions of N, P Utilizing Bacteria and Heterotrophic Bacteria in the Moderate Hypoxia Zone of the Changjiang Estuary

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Journal of Ocean University of China 2013年第4期12卷 589-598页

作者： LIU Jingjing DU Ping zeng jiangning CHEN Quanzhen SHOU Lu LIAO Yibo JIANG Zhibing Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of Oceanography State Oceanic Administration

The distributions of N utilizing bacteria (denitrifying bacteria and ammonifying bacteria) ,P utilizing bacteria (organic phosphobacteria and inorganic phosphobacteria) and heterotrophic bacteria in the Changjiang Estuary,and the roles of main environmental factors in distributing bacteria,are explored with observations from two cruises in June and August *** between the two important periods of initial hypoxia phase (June) and developed hypoxia phase (August) show differences in both bacterial distributions and the associated main environmental ***,the primary group of ammonifying bacteria has larger magnitude with spatial maximum value in the hypoxic stations related to sediment in *** phosphobacterial abundance and detection rates in August are much lower than those in June,but the denitrifying bacterial abundance becomes greater in ***,the difference of heterotrophic bacterial abundance between June and August is not ***,main environmental factors influencing bacteria vary from initial hypoxia phase to developed hypoxia *** parameters (salinity and NO3) in surface water and five environmental parameters (pH,salinity,PO43,NO3and temperature) in bottom water and surface sediment play major roles in the bacterial abundance in June,while different parameter combinations (salinity and PO43) in surface water and different parameter combinations (DO,DOC,NO3,PO43 and pH) in bottom water and surface sediment play major roles in ***,the bottom bacteria distributions in area south of 31 N are related to the position of the Taiwan Warm Current in *** bacterial abundance and distribution may respond to the environmental change in the hypoxia processes of initial phase and developed *** the hypoxia processes,the whole structure of bacterial functional groups probably turns to different states,causing the recycling of nutrient regeneration and aggravating hypoxia regionally.

关键词：异养细菌无机磷细菌缺氧区长江口氮利用生态分布表层沉积物细菌丰度

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