共查询到19条相似文献，搜索用时 250 毫秒
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根据１９８８年７月调查资料讨论了台湾海峡中北部海域夏季上升流区各种形态磷的分布特征。结果表明，上升流中心区（即海坛岛东侧一带水域）具有低温、高盐、低溶解氧；ＤＩｐ，ＴＤＰ，ＰＰ，ＴＰ较高；ＤＯＰ较低（０．２７）；及ＤＩＰ／ＤＯＰ比值（约为１）较高的特性。ＤＯＰ是该海域磷的主要形态（占ＴＰ的４９．２％），其含量分布及其形态转化与生物活动直接相关，是该海域生物生产力高的体现。 相似文献
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ODP与冲绳海槽海底热水活动研究 总被引：2，自引：1，他引：2
本文简要介绍了ＯＤＰ与海底热水活动研究，冲绳海槽中部现代海底热水活动区热水活动研究简况及其热水活动特征；就冲绳海槽中部热水活动研究中存在的问题与ＯＤＰ在冲绳海槽热水区钻探的科学目标进行了讨论。 相似文献
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３种常见的海洋浮游藻类－－扁藻、杜氏藻和牟氏角刺藻作为实验材料,采用正交方法设计实验条件,研究盐度、和光强的变化对藻类细胞内二甲基硫丙酸（ＤＭＳＰ）含量的影响。结果表明,３种藻类细胞ＤＭＳＰ含量相差很大。扁藻ＤＭＳＰ含量最高,其次为杜氏藻,牟氏角刺藻呈最低,种间差别的影响明显高于环境条件的变化对藻ＤＭＳＰ含量的影响。３种环境因陬对藻细胞ＤＭＳＰ含量的影响效果不同,盐度变化引起藻细胞ＤＭＳＰ含量的变 相似文献
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珠江河口水体有机物与盐度和氮,磷营养盐的关系 总被引：4，自引：1，他引：4
根据１９８７年２月至１９８８年２月的调查资料，讨论了珠江河口水域ＣＯＤ与盐度和Ｎ，Ｐ营养盐间的相互关系。线性回归的结果表明，纵断面Ⅲ的丰，枯水期ＣＯＤ与Ｓ和Ｎ，Ｐ间相关性很好，在９９％置信水平上显著，横断面Ⅰ，Ⅱ区间，ＣＯＤ与Ｓ呈岁相关趋势，ＣＯＤ与Ｎ高度显著相关，ＣＯＤ与Ｐ相关性次之。 相似文献
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１９９４年７月～１９９６年２月，ＯＤＰ在大西洋和地中海完成了１５７～１６５航次（Ｌｅｇｓ１５７－１６５）。这些最新航次的钻探资料和科研成果出版后传到国内还需要很长一段时间。这里根据 ＯＤＰ总部提供的资料，摘要编录 ＯＤＰ最近一年半的时间内的钻探活动和科学目标，以飨读者。 相似文献
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报道１９８９年山东省３０多个大中型代表水库浮游植物总生物量（ＴＢ）、微型浮游植物生物量（ｎａｎＢ）和各类主要浮游植物与８种理化因子的相关关系。结果表明，与浮游植物生物量相关的较为重要的理化因子依次是总磷（ＴＰ）、化学耗氧量（ＣＯＤ）、硬度（Ｈ）、透明度（ＳＤ）和深度（Ｚ）．总体上，ＴＰ、ＣＯＤ和Ｈ与浮游植物生物量呈正相关，而ＳＤ和Ｚ则呈负相关．各种理化因子与ＴＢ的关系和与ｎａｎＢ的趋于一致；与各主要藻类的关系主要是隐、裸藻类，其次是绿藻和硅藻与各理化因子相关性较大．重要理化因子与各主要藻类的关系也同对ＴＢ的相似，只是硅藻生物量百分比与ＳＤ呈极显著的正相关关系。 相似文献
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利用化石鱼牙齿的Ｓｒ同位素对深海粘土高精度测年Ｂ．Ｌ．Ｉｎｇｒａｍ为开展Ｓｒ同位素高精度地层学在深海粘土中的应用．本项研究中所用的远洋粘土样品于１９９２年取自ＯＤＰ１４５航次（北太平洋断面）在ＯＤＰ８８５和８８６钻孔中，远洋粘土沉积物每１．５ｍ取１０... 相似文献
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１ＯＤＰ的发展历史ＯＤＰ是原深海钻探计划（ＤＳＤＰ）的接续项目。ＧｌｏｍａｒＣｈａｌｌｅｎｇｅｒ号钻探船１９８３年退役之后，海洋科学家们为了能够在更深的海域作业并获取更深的样品，所以于１９８５年１月进行了首次试验性作业（Ｒａｂｉ－ｎｏｗｉｔｚ等，１９８５）后，在世界范围内具有重要地质意义的海区每两个月进行一个航次的海洋钻探。２ＯＤＰ的组织系统总部设在美国德克萨斯州农工大学（ＴｅｘａｓＡ&Ｍ）的ＯＤＰ是一个国际联合科学研究组织，称为：深地层采样联合海洋研究机构，简称：ＪＯＩＤＥＳ（ＪｏｉｎｔＯｃｅ… 相似文献
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Patrick Raimbault Wilfried Pouvesle Frdric Diaz Nicole Garcia Richard Sempr 《Marine Chemistry》1999,66(3-4)
We developed a simple and reliable method which allows simultaneous determination of organic forms of carbon (DOC), nitrogen (DON) and phosphorus (DOP) dissolved in seawater. Conversion of dissolved organic matter (DOM) to inorganic products (carbon dioxide, nitrate+nitrite and soluble reactive phosphate) is performed by a persulfate wet-oxidation in low alkaline condition. After oxidation, the concentration of the inorganic products dissolved in the sample was measured automatically by colorimetry using a 3-channel Technicon AutoAnalyzer system. A number of pure organic compounds were tested in the concentration range encountered in coastal and open ocean, indicating a high efficiency of the digestion procedure. The recovery range is similar to that obtained by other wet-oxidation procedures and by high-temperature catalytic oxidation techniques. Direct comparisons with usual methods used for separate determination of DOC, DON and DOP indicated a high efficiency of the procedure. Reproducibility tests demonstrated a very good precision (around 5%) for lagoonal and coastal waters, while precision was sometimes around 10–25% in oligotrophic oceanic waters, especially for DOP where values approached limits of detection for measuring phosphate. This method is highly suitable for routine analysis and especially appropriate for shipboard work. 相似文献
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Fuminori Hashihama Shinko Kinouchi Shuhei Suwa Masahiro Suzumura Jota Kanda 《Journal of Oceanography》2013,69(3):357-367
Trace concentrations of labile dissolved organic phosphorus (LDOP) in oligotrophic seawater were measured by use of an enzymatic procedure and a nanomolar phosphate analytical system consisting of a gas-segmented continuous flow analyzer with a liquid waveguide capillary cell. LDOP, defined as DOP hydrolyzed by alkaline phosphatase (AP) from Escherichia coli, was quantified as the difference between the phosphate concentrations of the seawater sample with and without AP treatment. For sensitive measurement of LDOP, we found that phosphate contamination derived from commercially available AP must be corrected, and azide treatment before AP treatment proved effective in removing biological effect that occurs during DOP hydrolysis. Field observations at six stations of the western North Pacific and the East China Sea during the boreal summer revealed that, in the upper 200 m of the water column, LDOP concentrations ranged from the detection limit (3 nM) to 243 nM, and phosphate concentrations ranged from 5 to 374 nM. The spatial distribution patterns of LDOP were similar to those of phosphate. Most of the depth profiles for LDOP and phosphate showed concentrations were extremely low, <25 nM, between the surface and the deep chlorophyll maximum layer (DCML) and increased below the DCML. Strongly depleted LDOP and phosphate above the DCML suggest that LDOP is actively hydrolyzed under phosphate-depleted conditions and utilized by microbes. 相似文献
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《Marine Chemistry》2007,103(1-2):112-121
Several operationally defined fractions of phosphorus (P) were measured along a surface water transect in the North Pacific. The P content in all fractions was found to increase northward from the edge of the subtropical to the subarctic region. Particulate organic P (POP) concentrations increased from 9 to 110 nmol L− 1, whereas the particulate inorganic P (PIP) concentrations increased from 1 to 13 nmol L− 1. A significant correlation between POP, PIP and chlorophyll a suggested that these P pools are associated directly or indirectly with phytoplankton cells. PIP comprised 10–20% of the total particulate P pool across the transect, indicating it is an important component of the marine P cycle in this region. Dissolved non-reactive P (assumed to consist predominantly of non-reactive organic P compounds, thus referred to as DOP) concentration increased from 0.10 to 0.22 μmol L− 1, whereas soluble reactive P (SRP) concentration increased from 0.01 to 1.42 μmol L− 1 along the transect. The proportion of DOP and SRP varied widely, with a large proportion of DOP in areas with low total dissolved P concentrations in lower latitudes and a large proportion of SRP in areas with high total dissolved P concentrations in higher latitudes. High demand for DOP in the lower latitudinal region would diminish the concentration of this pool relative to higher latitudinal regions where SRP is more abundant and would be preferentially utilized. The availability of SRP could have a significant impact on the concentration and probably on the composition of DOP. We show that P fractionation provides an important insight for discussing the marine P cycle. 相似文献
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The importance of dissolved organic phosphorus(DOP) as a potential nutrient source for primary producers in marine systems has been recognized for up to eight decades, but currently, the understanding of the biogeochemistry of DOP is in its infancy. In the present study, monthly data between 2000 and 2014 were used to analyze the temporal and spatial distributions of DOP in the Mir Bay, the northern South China Sea. The DOP residence time(T_(DOP)) was also investigated using a simple regression analysis in combination with chlorophyll a(Chl a) measurements while excess DOP(ΔDOP), produced by the biogeochemical processes of autotrophic production and heterotrophic removal, was determined using a two-component mixing mass-balance model in combination with salinity measurements. The results showed that the DOP concentration was(0.017±0.010) mg/L higher in the surface-water compared with the bottom-water and higher in the inner Tolo Harbour and waters adjacent to Shatoujiao compared with the main zone of the bay. Although seasonal changes and annual variability in the DOP were small, the surface DOP concentration was higher in the wet season(April–September)than in the dry season(October–March) due to the impacts of seaward discharges and atmospheric deposition into the bay. Measurement and regression results showed that the DOP release rate from phytoplankton production was about 1.83(gP)/(gChl a) and the T_(DOP) was about 7 d, which implied that the DOP cycle in the bay was rapid. The ΔDOP was calculated from the model to be about 0.000 mg/L in the main zone of the bay and about 0.002 mg/L in the inner Tolo Harbour and waters adjacent to Shaotoujiao, suggesting that the autotrophic production of DOP was almost balanced by the heterotrophic removal in the main zone of the bay and dominated in the inner Tolo Harbour and waters adjacent to Shaotoujiao. In conclusion, the Mirs Bay is very productive and fairly heterotrophic. 相似文献
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Abstract. .The phosphate uptake kinetics of single cells and colonies of the haptophycean alga Phaeocystis pouchetii were investigated in short- and long-term experiments. In phosphate-deprived cultures, the highest nutrient uptake rate (Vmax ) of both growth forms appeared to be similar. However, the half-saturation constant for phosphate uptake of the cells embedded in a colony (Ks = 3.08 μM) was considerably higher than that of the single cells (Ks = 0.31 μM). This is consistent with the existence of a diffusion barrier formed by the colony membrane and colonial mucus. Over a 24 h light/dark cycle, the phosphate assimilation rate in moderately limited colonies and single cells was nearly identical during the light period. In the following dark phase, colony cells maintained this uptake rate, whereas the uptake of the single cells diminished by 70 %. The high dark uptake rate in colonies ran parallel with the absorption and degradation of intracolonial carbon compounds, suggesting that the dissimilation of these compounds covers the energy requirements for phosphate uptake in the dark. In Phaeocystis cultures during a transition to phosphate depletion, a significant amount of phosphate was found in the colonial mucus, isolated by selective filtration. The possible absorption of phosphate by the mucus and the role of mucus in the energy budget seem to be an essential feature of phosphate uptake of colonies. Short-term measurement of phosphate uptake in colony cells may therefore underestimate the phosphate uptake of the whole colony. 相似文献