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Isotope constraints on seasonal dynamics of nitrogen in zhanjiang bay, a typical mariculture bay in South China

Acta Oceanologica Sinica 2024年第6期43卷 60-70页

作者： Chunqing Chen Qibin Lao Fajin Chen Guangzhe Jin Jiacheng Li Qingmei Zhu College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China School of Chemistry and Environment Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory for Coastal Ocean Variation and Disaster Prediction Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Climate Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088China

Eutrophication in coastal waters has been increasing remarkably,severely impacting the water quality in mariculture *** this study,we conducted multiple isotopic measurements on suspended particulate nitrogen(δ^(15)N-PN) and dissolved nitrate(δ^(15)N-NO_(3)^(-)and δ^(18)O-NO_(3)^(-)) in zhanjiang bay,a typical mariculture bay with a high level of eutrophication in South China,to investigate the changes in nitrogen sources and their cycling between the rainy and dry *** the rainy season,the study found no significant relation between δ^(15)NPN and δ^(15)N-NO_(3)^(-)due to the impact of heavy rainfall and terrestrial *** the upper bay,a slight nitrate loss and slightly higher δ_(15)N-NO_(3)^(-)and δ^(18)O-NO_(3)^(-)values were observed,attributed to intense physical sedimentwater *** some fluctuations,nitrate concentrations in the lower bay mainly aligned with the theoretical mixing line during the rainy season,suggesting that nitrate was primarily influenced by terrestrial erosion and that nitrate isotopes resembled the ***,the isotopic values of nitrate can be used for source apportionment in the rainy *** results indicated that soil nitrogen(36%) and manure and sewage(33%) were the predominant nitrogen sources contributing to nitrogen loads during this *** contrast,the dry season saw a deficient ammonium concentration(bay,due to nearly complete consumption by phytoplankton during the red tide ***,the significant loss of nitrate and simultaneous increase in the stable isotopes of dissolved and particulate nitrogen suggest a strong coupling of assimilation and mineralization during the dry *** active biogeochemical processes during the dry season may be related to decreased runoff and increased water retention ***,our study illustrated the major seasonal nitrogen sources and their dynamics in zhanjiang B ay,providing valuable insights for formulati

关键词： nitrogen stable nitrogen isotopes biogeochemical processes eutrophication zhanjiang bay

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Residues and sources of HCHs and DDTs in the sediments of land-based sewage outlet to the zhanjiang bay, China

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Acta Oceanologica Sinica 2019年第12期38卷 8-13页

作者： Lirong Zhao Yuzhen Shi Hui Zhao Jibiao Zhang Xingli Sun College of Chemistry and Environmental Science Guangdong Ocean University

Due to the large usage of DDT-containing antifouling paints and lindane in China, heavy residuals of DDTs and HCHs have been found in many fishing harbors, but there is lack of studies on this issue for the zhanjiang bay which is an important fishing harbor and mariculture zone in South China. To evaluate the pollution status and sources of HCHs and DDTs in the zhanjiang bay, the concentrations, spatial distributions and sources in the sediments of 11 land-based sewage outlets to the zhanjiang bay were investigated. Since the 1980 s, HCHs residuals had obviously decreased in studied areas, but DDTs had little change, even abnormally high levels were found in some sites. The content percentages and diagnostic ratios of HCHs isomers and DDTs showed that the source of HCHs was derived from soils around the bay and recent input of lindane, and DDTs were from historical residues of technical DDTs and fresh input of DDT-containing antifouling paints on fishing ships. Based on sediment quality guidelines, DDTs would be of more concern for the ecotoxicological risk on marine environment and adverse effects on benthonic organisms. This study indicated that lindane and DDT-containing products may be still used in some places of zhanjiang City. It should be urgent to control their usage and clean the DDTs-contaminated sites by the local government.

关键词： zhanjiang bay sediment DDTs HCHs

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Distribution and sources of sedimentary organic matter in different aquaculture areas of northeastern zhanjiang bay using stable carbon and nitrogen isotopes

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Acta Oceanologica Sinica 2024年第6期43卷 38-48页

作者： Fengxia Zhou Shuangling Wang Han Fang Jiani He Liang Ye Zhaohai Ding Cuiting Li Fajin Chen Xuan Lu Chunqing Chen Yafei Meng College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory for Coastal Ocean Variation and Disaster Prediction Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Climate Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088China

zhanjiang bay is a major aquaculture area in China with many types of mariculture products(such as oysters,fish,and shrimp).The culture area and shrimp output in zhanjiang bay are ranked first in *** investigated the total organic carbon(TOC),total nitrogen(TN),TOC/TN ratio,and stable isotopes(δ^(13)C and δ^(15)N) of the fish and shrimp feed,fish and shrimp feces,and sedimentary organic matter(SOM) in and around different aquaculture areas of northeastern zhanjiang B ay to study the impact of aquaculture activities on *** average TOC contents of fish and shrimp feed were 39.20%±0.91% and 39.29%±0.21%,*** average TOC content in the surface sediments of the oyster culture area,the mixed(fish and shrimp) culture area,and the cage fish farm area were 0.66%,0.88%±0.10%,and 0.58%±0.19%,respectively,which may indicate that mixed culture had a greater impact on *** relatively high TOC and TN contents and relatively low TOC/TN ratios,and δ^(15)N values in the upper layer of the core sediment in the mixed culture area could also support the significant influence of mixed *** average δ^(13)C and δ^(15)N values of fish and shrimp feed were -20.6‰±2.2‰ and 1.8‰±1.2‰,respectively,which were different from the isotopic values of SOM in the study area.δ^(13)C and δ^(15)N values for SOM in different aquaculture areas were different from those of nearby reference stations,probably reflecting the influence of *** δ^(13)C and δ^(15)N values in the oyster culture area(-25.9‰ and6.0‰,respectively) seemed to have reduced δ^(13)C and enriched δ^(15)N relative to those of the reference station(-24.6‰ and 5.8‰,respectively).This may reflect the influence of organic matter on oyster *** δ^(15)N value of the station in the mixed culture area(7.1‰±0.4‰) seemed to be relatively enriched in δ^(15)N relative to that of the reference station(6.6‰).Sedimentation and the subsequent degradation of organic matter from mixed cultures may have contrib

关键词： sedimentary organic matter aquaculture stable isotopes sources zhanjiang bay

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Numerical Study of the Donghai Dam Impact on the Hydrodynamic Environment of zhanjiang bay

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Marine Science Bulletin 2010年第1期12卷 16-29页

作者：李希彬孙晓燕于华明鲍献文国家海洋局天津海洋环境检测中心站天津300451 国家海洋信息中心天津300171 中国海洋大学海洋环境学院山东青岛266100

In this paper, the Finite Volume Coastal Ocean Model （FVCOM） was employed and configured for 3 dimensional numerical simulations of tide and tidal current based on the field observations in zhanjiang bay. The model＇s results agree well with the field observed data. Based on the well validated model, the hydrodynamic fields of zhanjiang bay area were calculated both before the Donghai Dam constructing and after that. Compared the tidal level, current field, tidal capacity and water exchange ratio before the construction of Dohai dam with those after construction of the dam, we analyzed and get some conclusions of effects of Donghai Dam on Hydrodynamic environment of the zhanjiang bay.

关键词： zhanjiang bay Donghai dam numerical model hydrodynamic environment

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湛江港皮氏叫姑鱼种群生物学特征和资源开发状态研究

湛江港皮氏叫姑鱼种群生物学特征和资源开发状态研究

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第二届水生生物论坛

作者：廖东荣黎傲雪陈宁吕少梁王学锋广东海洋大学水产学院

为探究湛江港皮氏叫姑鱼（Johnius belangerii）的生活史特征及其资源开发状态,根据2016—2021年湛江港海域底拖网调查数据,使用ELEFAN I、Pauly经验公式、长度转换捕获曲线法、逻辑斯蒂等方法估算了皮氏叫姑鱼的生长、死亡参数和初始... 详细信息

为探究湛江港皮氏叫姑鱼（Johnius belangerii）的生活史特征及其资源开发状态,根据2016—2021年湛江港海域底拖网调查数据,使用ELEFAN I、Pauly经验公式、长度转换捕获曲线法、逻辑斯蒂等方法估算了皮氏叫姑鱼的生长、死亡参数和初始性腺体长,并根据实际种群分析（Virtual Population Analysis,VPA）、Beverton-Holt动态综合模型评估了该渔业资源开发状态。结果表明:湛江港海域皮氏叫姑鱼体长分布范围为27.03～182.00 mm,体质量分布范围为0.19～137.34 g,生长条件因子a为1.16×10,异速生长因子b为3.15。生长方程的极限体长（L）为185.85 mm,生长系数（K）为0.61,理论生长年龄（t）为-0.27,初始性腺体长为128.40mm。总死亡系数（Z）、自然死亡系数（M）、捕捞死亡系数（F）分别为2.40、0.75和1.65。湛江港皮氏叫姑鱼种群资源在渔业中全年连续补充,补充量呈现为单峰型,补充量峰期在5月,首次捕捞体长（83.74 mm）远小于最适开体长（131.95 mm）,捕获长度主要集中在77 mm到137 mm之间,捕捞对象多为幼鱼和补充群体,具有小型化趋势。湛江港皮氏叫姑鱼开发率（E）为0.69,高于最大可持续开发率(E=0.63),在当前捕捞状态下,仅不到15%的资源量可以得到保持,处于过度捕捞状态。本研究表明湛江港海域皮氏叫姑鱼资源面临较为严峻的资源环境,渔业资源呈现衰减趋势,符合补充型过度捕捞的特征。为了应对这种不利环境,该种群将原来的生活策略逐渐转变为r选择生长策略,以有效的提高资源生物补充量,维持种群结构的稳定性,延续自身种群的繁衍生存。为保护该种群资源,应加强休渔力度,通过监测调查降低捕捞死亡系数,减少捕捞压力,并将开捕年龄设于初始性腺成熟年龄、生长拐点年龄之后,临界年龄之前,即开捕体长应在128.40 mm～133.59 mm间,使更多的雌性群体能够参与生殖活动,允许补充群体的生长和繁殖,充分利用其生长发育潜能,使种群资源达到最优,避免补充型过度捕捞的发生,以实现其资源的合理利用和可持续性。

关键词： Johnius belangerii Biological characteristics Exploitation status zhanjiang bay

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