长江入河口区生源要素的浓度变化及通量估算   总被引：38，自引：4，他引：38  

刘新成  沈焕庭  黄清辉 《海洋与湖沼》2002,33(3):332-340

利用近几十年长江大通断面的实测流量和生源要素（C、N、P、Si)资料，讨论了C、N、P、Si较长时间序列浓度的变化特征和长江入河口区的通量，结果表明，HCO3^-浓度比较稳定，波动较小；NO3^-,NO2^-,PO4^3-主要呈上升趋势；游离CO2，NH4^ 和SiO3^2-浓度表现出一定下降趋势；估算并研究了长江C、N、P、Si入河口区年内各月的平均通量，年际间各年的通量和多年平均的年均通量和主要变化特征；利用月通量序列以及相应的流量序列，拟合出可以利用已知的月均流量预测进入河口区的月通量的关系函数，这些研究是进行河口区生源要素收支平衡计算的重要基础。  相似文献   

A review of the impacts of salmonid farming on marine coastal ecosystems in the southeast Pacific   总被引：2，自引：0，他引：2  

Buschmann  Alejandro H.; Riquelme  Veronica A.; Hernandez-Gonzalez  Maria C.; Varela  Daniel; Jimenez  Jaime E.; Henriquez  Luis A.; Vergara  Pedro A.; Guinez  Ricardo; Filun  Luis 《ICES Journal of Marine Science》2006,63(7):1338-1345

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Remote sensing of sea surface nutrient in the frontal zone of Changjiang diluted water and the Taiwan Warm Current     

ZHANG Xiaoyu  LIN Yi''an  HE Xianqiang  WANG Difeng  GONG fang  ZHANG Wei 《海洋学报(英文版)》2007,26(3):22-32

Field investigation was carried out during 4 to 15 April 2001 around the Changjiang River Estuary. The similar distribution of sea surface nutrients and suspended sediment (SS) concentration is attributed to the physical mixing of Changjiang diluted water (CDW) with the Taiwan Warm Current (TWC). On the basis of the observed positive relationship between total phosphorus (TP) and SS concentration, the sea surface TP is inversed from satellite SS data. SS is believed to be an ideal eutrophic state assessing index substitution for TP, the eutrophication classification critical value of SS adopted in this research was based on the linear model: cTP=0.000 6cSSsat 0.016 3, r2=0.564 5, n=32. Although lack of in-situ chromophoric dissolved organic matter (CDOM) measurement, a good relationship was observed between the in-situ DIN (dissolved inorganic nitrogen) concentration with near real time SeaWiFS absorption coefficient of CDOM (ACD) data: cDIN=1.406 5AACBsat-0.035 9,r2=0.741 5,n=16. This empirical regression algorithm was also utilized for inversing the DIN concentration from SeaWiFS ACD data, and for establishing the eutrophication classification critical value of satellite ACD data. The established remote eutrophication classification system was later used for seawater eutrophic state assessment. The evaluation suggested that the Zhoushan Fishing Ground especially the western border is affected seriously with the nutrient input. The nutrient is mainly from the terrestrial source transported by the Changjiang River runoff. The seawater quality classification precision was assessed by in-situ data, which suggested the seawater quality distribution is similar to the two classification systems, and the remote classification error is below 25%.  相似文献   

The Detritic Compartment in a Posidonia oceanica Meadow: Litter Features, Decomposition Rates, and Mineral Stocks     

Javier  Romero  Gérard  Pergent  Christine  Pergent-Martini  Miguel-Angel  Mateo Cécile  Regnier 《Marine Ecology》1992,13(1):69-83

Abstract. The ecosystem associated to the Mediterranean seagrass Posidonia oceanica shows a clear distinction in two subcompartments regarding turnover time: aboveground and belowground. Aboveground parts (leaves) are highly dynamic, and most of the leaf material is decomposed or exported in less than one year, representing a net loss of nutrients. In contrast, belowground biomass (roots and rhizomes) has a turnover time of the order of centuries, with a consequent accumulation of organic matter in the sediment. The accumulation rates for the single elements rank in the order C > N > P. This ecosystem may be considered as a sink for biogenic elements.  相似文献   

The need to understand the behaviour of fish reared for mariculture or restocking     

Gro Vea Salvanes  Anne; Braithwaite  Victoria 《ICES Journal of Marine Science》2006,63(2):345-354

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台湾海峡及邻近海域4种头足类的食性和营养级研究   总被引：7，自引：0，他引：7  

黄美珍 《台湾海峡》2004,23(3):331-340

本文研究中国枪乌贼、杜氏枪乌贼、目乌贼和短蛸4种头足类的食性与营养级.结果表明,中国枪乌贼和杜氏枪乌贼整年摄食率都高,目乌贼在春、夏季高,短蛸则在秋季摄食率高.4种头足类胃饱满系数皆呈现明显的季节变化.中国枪乌贼属游泳生物食性类型,杜氏枪乌贼和目乌贼属游泳动物和底栖动物混合食性类型,短蛸属浮游动物和底栖生物食性类型.4种头足类混合饵料的营养级分别为2.62、2.85、2.88和2.04级,均处于第三营养层次.其食物的重叠指数均超过0.7,食物重叠明显,对该海域的鱼类、甲壳动物(长尾类和短尾类)、头足类、糠虾类、端足类、樱虾类、腹足类等饵料生物存在激烈的竞争.  相似文献   

营养盐对海洋浮游植物生长的影响--数学模型研究   总被引：18，自引：0，他引：18  

王修林  张蕾  韩秀荣  祝陈坚  葛明 《海洋科学进展》2002,20(3):96-101

概述了海水中营养盐和细胞体内营养元素含量对海洋浮游植物生长的影响，并阐述了数学模型方法描述海洋浮游植物生长的发展过程，指出在现有生物生长模型基础上，建立重要营养物质迁移，转化等生态学过程与赤潮生物生长关系相结合的数学模型是建立现场环境条件下海洋浮游植物生长数学模型，进而揭示有害赤潮发生的生态学机理等的必要科学基础。  相似文献   

海水营养盐现场监测   总被引：10，自引：2，他引：10  

邹常胜 《海洋技术学报》2001,20(4):33-37

海水营养盐现场监测技术是90年代初发展起来的新技术。海洋技术研究所对这一技术进行了研究和探索，开发研制了营养盐现场自动分析仪，本文从该仪器的性能指标、工作原理、分析工艺流程、组成及工作方式做了较全面的介绍。  相似文献   

Modelling multi-nutrient interactions in phytoplankton; balancing simplicity and realism     

Kevin J Flynn 《Progress in Oceanography》2003,56(2):249-279

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营养盐在东海春季大规模赤潮形成过程中的作用   总被引：3，自引：0，他引：3  

张传松  王修林  朱德弟  王江涛 《中国海洋大学学报(自然科学版)》2007,37(6):1002-1006

为研究营养盐在东海大规模赤潮形成过程中的作用,分别于2004,2005年春季在东海赤潮爆发前进行了2个航次的海上调查。调查结果显示:DIN,PO4-P,SiO3-Si浓度分别高达15,0.55,15μmol.L-1以上,调查海域整体上处于富营养化状态;受陆源输入影响,调查区域营养盐分布呈现出近岸高、外海低,等值线走向与岸线基本平行的特点。同2004年相比,2005年春季调查海域营养盐高值区明显外扩,营养盐水平整体升高:其中DIN浓度升高9%、PO4-P升高18%、SiO3-Si升高60%,硅磷比上升60%,硅氮比上升了47%。研究结果表明,较高的营养盐浓度水平,较高的硅酸盐含量以及较高的硅磷比、硅氮比值是2005年春季优先爆发大规模硅藻赤潮的重要原因之一。  相似文献