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The impact of typhoons on the biogeochemistry of dissolved organic matter in eutrophic bays in northwestern South China Sea

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Acta Oceanologica Sinica 2024年第6期43卷 15-31页

作者： Xuan Lu Qibin Lao Fajin chen Guangzhe Jin chunqing chen Qingmei Zhu College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Polar and Marine Research Institute College of Harbor and Coastal EngineeringJimei UniversityXiamen 361021China 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 SeaDepartment of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088China

Highly productive estuaries facilitate intense decomposition of dissolved organic matter(DOM) as a carbon ***,the specific impacts of typhoons on DOM decomposition in eutrophic bays remain *** address this issue,we investigated the spectral characteristics of DOM before and after Typhoon Ewiniar in Zhanjiang B ay,a eutrophic semi-enclosed bay in the northwestern South China *** results revealed that intense microbial decomposition of DOM occurred during the pre-typhoon period because high nutrient inputs facilitated the mobilization of DOM in the ***,the intrusion of external seawater induced by the typhoon diluted the nutrient levels in Zhanjiang B ay,reducing the impact of microbial decomposition on DOM during the post-typhoon perio ***,the net addition of DOM occurred in Zhanjiang Bay during the post-typhoon period,possibly because of the decomposition of particulate organic matter(POM) and desorption of particulate *** addition,an increase in apparent oxygen utilization,a decrease in DO saturation and the reduced level of Chl a indicated that organic matter(OM) decomposition was enhanced and OM decomposition shifted to POM decomposition in Zhanjiang Bay after the ***,our study highlighted the shift in the intense OM decomposition from DOM to POM decomposition before and after typhoons in eutrophic bays,providing new insights into the response of typhoons to biogeo chemistry.

关键词： dissolved organic matter optical analyses decomposition typhoon northwestern South China Sea

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

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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(<0.2 μmol/L) in the 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

Distribution and Sources of Particulate Organic Matter in the Northern South China Sea: Implications of Human Activity

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Journal of Ocean University of China 2021年第5期20卷 1136-1146页

作者： HUANG Chao LAO Qibin chen Fajin ZHANG Shuwen chen chunqing BIAN Peiwang ZHU Qingmei College of Ocean and Meteorology 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 Marine Environmental Monitoring Center of Beihai State Oceanic AdministrationBeihai 266031China Institute of Marine Science Shantou UniversityShantou 515063China

In order to understand origin and fate of particulate organic matter,the isotopic composition(δ^(13)C andδ^(15)N),total or-ganic carbon content,total nitrogen content,and C/N ratios were measured for suspended particulate organic matter(POM)collected from the northern South China Sea(NSCS)during *** study revealed thatδ^(13)C generally decreased from land to sea,and elevatedδ^(13)C occurred at the nearshore stations,suggesting that POC was mainly contributed from the eutrophic level and microbial ***,the distribution ofδ^(15)N values were complicated,and heterotrophic modification was responsible for higherδ^(15)N in the nearshore *** distribution patterns ofδ^(13)C andδ^(15)N in the nearshore stations may be associated with the intensifi-cation of human activity in the *** on the Stable Isotope Analysis in R model,65%of POM was contributed by marine or-ganic matter in the NSCS,20%by terrestrial inputs,and 15%by freshwater algae.

关键词： particulate organic matter stable isotope C/N ratio isotope mixing model South China Sea

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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运用非语言交际优化英语教学

内蒙古农业大学学报（社会科学版） 2007年第6期9卷 238-240页

作者：陈春卿三明学院教育系福建三明365004

课堂教学活动是在多方面通过师生共同交往来完成的,开展非语言交际的研究有利于课堂教学,改变传统教学中较为单一的教学方式。课堂教学中使用非语言交际手段,激发学生的兴趣,提高教学质量.提高学生的认知能力和学习效率。非语言交际在... 详细信息

课堂教学活动是在多方面通过师生共同交往来完成的,开展非语言交际的研究有利于课堂教学,改变传统教学中较为单一的教学方式。课堂教学中使用非语言交际手段,激发学生的兴趣,提高教学质量.提高学生的认知能力和学习效率。非语言交际在教学中起着举足轻重的作用。

关键词：非语言交际应用英语教学

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体育的教学功能及其在教学中运用的理论研究

内蒙古工业大学学报（社会科学版） 2004年第2期13卷 125-127页

作者：陈春庆内蒙古工业大学体育部内蒙古呼和浩特010062

本文通过体育教学实践和理论研究,论述了在体育教学中,体育课程具有社会、情感、美育和意志的功能,分析体育教学过程与其功能的关系,同时认识体育教学自身内在的本质,与社会、心理、美育的作用。为培养合格人才确定体育教学的客观依据... 详细信息

本文通过体育教学实践和理论研究,论述了在体育教学中,体育课程具有社会、情感、美育和意志的功能,分析体育教学过程与其功能的关系,同时认识体育教学自身内在的本质,与社会、心理、美育的作用。为培养合格人才确定体育教学的客观依据。从而更好的提高教学质量,全面实现素质教育。

关键词：体育教学社会情感美育意志功能

汕头近岸海域氮、磷的变化趋势及潜在性富营养化研究

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广东化工 2017年第13期44卷 183-185页

作者：陈淳清汕头市环境保护监测站广东汕头515041

本文通过对2012~2015年汕头近岸海域水体中的无机氮DIN(NH_4-N、NO_2-N和NO_3-N)、活性磷酸盐DIP的结构和分布特征进行分析,并结合水质状况对该海域的富营养化水平进行评价。结果表明:调查期间,汕头近岸海域海水质量总体状况良好,无机... 详细信息

本文通过对2012~2015年汕头近岸海域水体中的无机氮DIN(NH_4-N、NO_2-N和NO_3-N)、活性磷酸盐DIP的结构和分布特征进行分析,并结合水质状况对该海域的富营养化水平进行评价。结果表明:调查期间,汕头近岸海域海水质量总体状况良好,无机氮、磷含量范围在海水水质二至三类标准之间,显示其主要污染源是地表径流和港湾排污。潜在性富营养化评价结果显示:在调查的各个水期中,有67.9%站位的海水水质的平均状况属于中度营养(Ⅱ),26.2%站位的海水水质的平均状况属于富营养(Ⅲ),(Ⅲ)类水质都是出现在S2、S4站位。

关键词：汕头近岸海域无机氮磷变化趋势潜在性富营养化

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经口内镜甲状腺手术的护理配合

护理研究（上旬版） 2013年第6期27卷 1618-1619页

作者：姚娇陈纯清厦门大学附属中山医院

甲状腺腺瘤是最常见的甲状腺良性肿瘤，有引起甲状腺功能亢进（发生率约为20％）和恶变（发生率约为10％）的可能，故应早期行包括腺瘤的患侧甲状腺大部或部分（腺瘤小）切除[1]。传统的甲状腺手术会给病人颈部留下6cm～8cm的手术瘢痕... 详细信息

甲状腺腺瘤是最常见的甲状腺良性肿瘤，有引起甲状腺功能亢进（发生率约为20％）和恶变（发生率约为10％）的可能，故应早期行包括腺瘤的患侧甲状腺大部或部分（腺瘤小）切除[1]。传统的甲状腺手术会给病人颈部留下6cm～8cm的手术瘢痕，给病人造成很大的心理负担。随着腹腔镜外科器械及技术的发展，

关键词：甲状腺自然腔道内镜外科手术手术配合

慢性肾脏病腹膜透析患者实施个案管理的效果分析

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浙江医学教育 2019年第3期18卷 38-40页

作者：邱菊萍陈春青温岭市中医院

目的:探讨个案管理在慢性肾脏病矿物质和骨代谢紊乱(CKD-MBD)患者持续性不卧床腹膜透析临床效果。方法:选择2017年1月至2018年5月本院100例慢性肾病矿物质和骨代谢紊乱患者按就诊顺序分为对照组和研究组。对照组予常规护理,研究组实施... 详细信息

目的:探讨个案管理在慢性肾脏病矿物质和骨代谢紊乱(CKD-MBD)患者持续性不卧床腹膜透析临床效果。方法:选择2017年1月至2018年5月本院100例慢性肾病矿物质和骨代谢紊乱患者按就诊顺序分为对照组和研究组。对照组予常规护理,研究组实施个案管理。记录2组患者生化、自我照护能力。结果:治疗6个月后,研究组血液生化差值变化(血钙0.54±0.12VS0.23±0.09、血磷0.51±0.11VS0.22±0.05)、自我照护评分(总均分9.71±2.04VS6.41±1.37)优于对照组,差异有统计学意义(P<0.05)。结论:应用个案管理能改善CKD-MBD患者肾功能,提高自我照护能力。

关键词：个案管理慢性肾脏病矿物质骨代谢紊乱持续性不卧床腹膜透析