PRELIMINARY STUDY ON THE DISSOLVED AND COLLOIDAL ORGANIC CARBON IN THE ZHUJIANG RIVER ESTUARY

This paper reports data on the dissolved and colloidal organic carbon in the Zhujiang (Pearl) River estuary. DOC concentration was 142 to 239 μmol/L in the freshwater taken in March 1997 from the four Zhujiang River tributaries flowing into the Lingdingyang estuary. High concentration was observed in the Humen tributary located near Guangzhou. The rapidly increased DOC concentration at low salinities (～5) may be attributed to the exchange between macroparticulate and dissolved organic matter during the earl...ThisworkwassupportedbyEuropeanCommissionundercontractCI1 -CT94 -0 1 3

Study on species diversity of macrobenthos in Daya Bay,South China Sea

利用2004年3月、5月、9月和12月的大型底栖动物定量采样数据,对大亚湾大型底栖动物的物种多样性进行研究。结果表明,因人类活动影响的加剧,目前大型底栖动物多样性明显低于历史水平。2004年大亚湾海域内共出现79种(类)大型底栖动物,全海域均匀度(J)、丰富度(D)和Shannon-Wiener指数(H′)均值分别为1.17、0.74和2.06。各多样性指数的季节变化较小,不存在显著差异(P>0.05)。多样性水平以冬季0.05).The level of species diversity showed the trend of winter < spring < summer < autumn.It has been found that the distinct change of dry and wet season,the species diversity in wet season was higher than those in dry season.The species diversity of macrobenthos in outer Bay was the highest among other areas.The dominant species of Veremolpa micra and Timoclea scabra were so abundant that the species diversity of macrobenthos in center Bay and inner Bay were low.The seasonal change of the species diversity of macrobenthos in center Bay and inner Bay was caused by the change of the abundance of V.micra and T.scabra.Then the abundance of V.micra and T.scabra fluctuated with the water temperature directly.科技部社会公益研究专项资金项目(2005DIB3J020);; 广东省重大科技兴海项目(A200099E01);; 中央级公益性科研院所基本科研业务费专项资金(中国水产科学研究院南海水产研究所)资助项目(2007ZD08);; 农业部海洋与河口渔业重点开放实验室基金项目(开-2-04-15);; 农业部渔业生态环境重点开放实验室开放基金项目(2004-22005-2

Macrobenthic community structure in Daya Bay,South China Sea

利用2004年3月、5月、9月和12月的大型底栖动物定量采样数据,对大亚湾大型底栖动物的群落结构进行研究。结果表明,大亚湾大型底栖动物大致可分为3个群落,分别分布于湾顶及湾中大部分海域、湾中部和湾口海域,湾中部海域群落的变化较为显著。大型底栖动物整体群落结构的季节变化总体较小,但雨季对大型底栖动物群落的影响较大,存在较明显的干湿季差异。大亚湾海域生态环境受到明显的扰动,处于扰动状态中的大型底栖动物群落稳定性较差;湾顶和湾中大部分海域内的群落Ⅰ,为大亚湾的主体群落,以软体动物为主,种类组成单一、季节变化小,以小鳞帘蛤VErEMOlPA MICrA和粗帝汶蛤TIMOClEASCAbrA为特征种。该群落的稳定性最差,处于较强烈的扰动之中;稳定分布于湾口的群落Ⅲ稳定性最好,未受到扰动,以多毛类为主,种类组成较为复杂、变化较大;湾中部海域大型底栖动物群落结构变化较为复杂,主要变化区域为马鞭州附近海域。该群落系经强烈的人为扰动后,经次生演替而形成的新群落,其种类组成的季节变化非常显著,各季的种类几乎完全不同,群落的独立性和抗干扰能力均较弱;与1980'S相比,大亚湾大部分区域内大型底栖动物基本保持了原有的群落,但群落稳定性大幅下降,群落的分布范围和种类组成发生较大程度的改变,主体群落组成呈明显的简单化趋势。在人类活动影响下,湾内同一区域内群落完全演替、湾中部海域出现新的群落。Based on macrobenthos samples collected from 4 survey cruises at 40 research stations in March,May,Sept.and Dec.2004 in Daya Bay,South China Sea,the community structure of macrobenthos was studied.The result showed that macrobenthos community in Daya Bay can be divided into three groups from the inner bay to the main area of the central bay,the central bay and outer bay.The effect of changes between wet and dry seasons on the macrobenthos community structure in Daya Bay was relatively stronger,although seasonal effect on the overall community structure was small.Daya Bay was shown to be ecologically disturbed and the stability of macrobenthic community was weak.Specifically,the inner bay and main area of the central bay was strongly disturbed and was dominated by Group I community that was characterized as simple low stability and dominated by molluscs.Dominant species were Veremolpa micra and Timoclea scabra.The outer bay received little disturbance and the community was most stable.The community belongs to Group Ⅲ that was dominated by polychaete and characterized as complicated and variable.The community change in the central bay was more complicated,concentrated mainly around Maiban Zhou.Its community structure was strongly affected by human disturbance and largely different from other community groups.Species composition of the group was variable which differed largely between seasons.The stability and resilience of the community is low.The current macrobenthic community in Daya Bay is different from the 1980s' state with largely different species composition,reduced community stability and complexity.Overall,under human disturbance,the macrobenthos community in Daya Bay,and particularly in the central bay,changed to a totally different structure.中央级公益性科研院所专项基金资助项目(2007ZD08;2007ST08);国家科技部公益资助项目(2005DIB3J020);广东省重大科技兴海资助项目(A200099E01);国家农业部海洋与河口渔业重点开放实验室基金资助项目(开-2-04-15);国家农业部渔业生态环境重点开放实验室开放基金资助项目(2004-2、2005-2

Ambient nitrate switches the ammonium consumption pathway in the euphotic ocean

高树基教授研究团队的研究论文，以现场原位速率观测与环境因子调查，证明了环境硝酸盐浓度是调控海洋真光层不同氨氮消耗途径的关键因子。硝酸盐通过影响浮游植物对于氨氮吸收的能力，决定了真光层内氨氮的氧化路径强弱，刻画了海洋真光层氮循环的微结构。高树基团队利用同位素示踪培养技术，围绕南海和西北太平洋真光层内硝化作用和浮游植物氨氮吸收速率的垂直分布特点及其动力学特征进行研究。首次提出硝酸盐浓度通过影响不同浮游植物类群对于氨氮的吸收能力，从而调控真光层的氨氮消耗途径。研究团队的万显会博士为成果的第一作者，近海海洋环境科学国家重点实验室的戴民汉教授，史大林教授、张瑶教授、盛华夏博士后、祝依凡，以及澳大利亚联邦科学与工业研究组的Tom Trull教授和美国Bigelow海洋实验室的Mike Lomas教授为成果的共同完成人。【Abstract】Phytoplankton assimilation and microbial oxidation of ammonium are two critical conversion pathways in the marine nitrogen cycle. The underlying regulatory mechanisms of these two competing processes remain unclear. Here we show that ambient nitrate acts as a key variable to bifurcate ammonium flow through assimilation or oxidation, and the depth of the nitracline represents a robust spatial boundary between ammonium assimilators and oxidizers in the stratified ocean. Profiles of ammonium utilization show that phytoplankton assemblages in nitrate-depleted regimes have higher ammonium affinity than nitrifiers. In nitrate replete conditions, by contrast, phytoplankton reduce their ammonium reliance and thus enhance the success of nitrifiers. This finding helps to explain existing discrepancies in the understanding of light inhibition of surface nitrification in the global ocean, and provides further insights into the spatial linkages between oceanic nitrification and new production.This work is supported by the National Natural Science Foundation of China through grants 91328207, Science Fund for Creative Research Groups of the National Natural Science Foundation of China through grants 41721005 and National Basic Research Program of China (973 Program) through grants 2014CB953702, 2015CB954003. T.W.T. was supported by an MEL Visiting Scholar award. 成果获得了国家重点基础研究发展计划（2014CB953702, 2015CB954003），国家自然科学基金委“创新研究群体项目”（41721005）以及重点基金（91328207）的资助

Y型聚乙二醇干扰素琢-2b注射液治疗HCV基因2/3型慢性丙型肝炎患者疗效和安全性的多中心随机对照试验研究

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黑龙江及达赖湖的水化学材料

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