共查询到20条相似文献，搜索用时 562 毫秒
1.
《海洋学报》1990,(1)
Marlne Hydrology11······.-··一,···……A hvbrid model for numerical wave forecasting and its implementarion一IThe w 1 nd wave model 甲en sheogehang(S,e.甲e,)(文圣常),Zhang Daeuo(张大错),che。召。人ai(陈波海) and Guo Peifa六g(郭佩芳)l一15··················……Parame全ers 1 n wind·wave frequeneys阵etra and their bearings ons详etrum forms and growth 邵en she,了ehang(s.e尸en丫文二、,艺内a,,尸。a〔、uo(张大错),‘uo pei心n矛(郭佩芳) and Chen Bohai(陈波海)王41····… 相似文献
2.
《海洋学报》1992,(1)
Marine Hydrology一l·····……E,t imation of wat,r vol叹爪,tran3port3 throu‘h main stra!ts ort、”Eagt Cl‘inas“a Zhao刀。ore。(赵保仁)and Fa,夕‘”OhO”夕(方国洪)1一15······……T卜户e二f Oc七of intolnal tid,5 on thev,rt!cal structur,of tidal culront in tho North Huaugha!Sea Zhao Jon。人e”夕(赵浚仁),‘eog夕hfj‘。。夕(耿世江),Son万001￡a”,(刹、洪亮)and Zhaog 2111(于长自历)1一37······……Surfaeod呈弓tribution of alkalinity ands,eeifie alkalinit犷and thoir apPlieation to… 相似文献
3.
4.
I\rnooUcrIoxThe drpdric fish species cor-npositlon is an imPOrtant element 1n the study of fish ecologyand plays an important guiding role ln fishery preduction and roouLrces rnanagement. Lin(l988) and Zhang (1994 and l995) have studied the simi1drities of mpulation COtwsition ofame s1ngle species of different yea-rs including hairtail Trichuras haumee and yellDw cndertwinena cmi. But no rePOrt is available on the discridrination of the sidrildrities amongmuLlt1ple sPecies composition of… 相似文献
5.
М.В.КЛЕНОВА 《海洋与湖沼》1958,1(1):251-254
3a几a味a co口a朗eR“兄rPyHTOBbl盖蕊叩二‘月口曰二‘‘去.,J、..~~.~,一一一一f蛋像月a刀e 193任x ro助BB n打件叱几nl恤tOOB已H扒只C日只3”c paC出即eH”乃M印anOBoro nPOM曰Cna冬BaPOH叭。加”班叩‘x却“昭rePa HC以,aBa八pHH日以咖咪e只而.印y盯oa机OPc从Om双曰补yno娜合252海洋与湖沼1卷6刀只心T HeeK叭‘Ko enoeo6o日:I)Ha HaB”ra城班oH任blx KaP丁ax o6H味Ho o6o3Ha勺a幻T Ha3BaHH只叩yH眼H ero即aoHe众二Hx oeo6eHHocren BB”几e 6yKseH阴x 0605毗、e朋几,T.e. H3o印眺eHHe只B月只盯e只nPepbIBH… 相似文献
6.
Aneuploidy embryos of Pinctada martensii Dunker are produced during tetraploid induction by inhibiting the first polar body in eggs from triploid fertilized with haploid sperms with cytochalasin B treatment. Chromosome analysis reveals that there are 88.18 ±6.79% aneuploidy embryos, and 28.70% aneuploids in pearl oysters of one-year age These aneuploids have five chromosomal conditions, such as 2n + 1(29), 2n + 2 (30), 3n-2 (40), 3n-1(41) and 3n + 1 (43). Results of growth measurement show that there is no significant difference between aneuploids (as a group) and diploids in body size and weight (p ＞ 0.10), but the aneuploide is obviously different from triploid (p ＜ 0.01). The mean body size and weight of aneuploids in diploid condition (2n ± 1 and 2n ± 2) are significantly smaller than those of diploids (p ＜ 0.01),but aneuploids within triploid condition (3n ± 1 and 3n ± 2) are not smaller than diploids in body size and weight (p ＞ 0.1).This study indicates Pinctada martensii Dunker could tolerate aneuploidy by 7 ～ 14% of the haploid genome, and that aneuploids of this species are viable under certain conditions. 相似文献
7.
《海洋学报(英文版)》1988,(4)
Marine Hydrology1TheotetiealtrU】11wind wavefrequeney sPeetra in deeP water一1.Form of sPee-andShe户碧cha塔(S.C于婉,,)(文圣常).Zlla,瞥Daeuo(张大错),Clle,:Bohai(陈波海)Guo Peifal诊(郭佩芳)l7The aPPlieation of wave refraetion一diffractio一1 nlodel with frietion7必一毋Decai(蒋德才)and Ye Al:le(叶安乐)27The effeet of horlzontal八刀,211150,Ig(范植松)Coriolis force oninternal wave一mean flow interaetion159Theoretical wind wave frequeneyand verification of sPeetra肠n Shengclla声瞥(S.C环乞… 相似文献
8.
Chen Changsheng Chen Zhengqiang Hu Jiacai Ye Zhaohong Ji Dehu Lan Liangchun 《海洋学报(英文版)》2001,20(3):409-415
INTRODUcrIONAs a quality seaha, lobster has a greater market demand or higher demand than supply. Inrecent years the natural resource of lobster is decreasing day by day due to overfishing oPera-tions. Conequently, an attention has been increasingly drawn to the development of artificialbreeding in lObster and seedstock preduction. From the l970s to the l980s the culture of lobsterlarva started but with very slow pngress. Inoue et al. (l978), Yamakawa et al. (1989), Kitta-ka and Kimura(l… 相似文献
9.
The spatial distribution of physico-chemical parameters(sea surface temperature(SST), p H, sea surface salinity(SSS), dissolved oxygen(DO) and Secchi depth) along with filterable nutrients(dissolved inorganic nitrate(DIN),dissolved inorganic phosphate(DIP) and reactive silicate(DSi)) are measured in the winter months of November,December, January and February for four consecutive years from 2009–2010 to 2012–2013 on the shallow continental shelf(20 m bathymetry) of the coastal waters(up to 18 km away from shoreline) of the northern Bay of Bengal(n Bo B) during the highest high tide(HHT) and lowest low tide(LLT) hours for the first time. The variability of the coastal biogeochemical environment is assessed during the HHT and LLT hours and for this purpose, seawater samples are collected from seven different locations of a transect in the coastal region. Physicochemical parameters(except SST) show significant difference in magnitude during the HHT and LLT hours respectively. p H, SSS and DO are found to increase in the HHT hours and vice-versa. The data reveal that during the LLT hours, a relative increase of freshwater input in the n Bo B can have elevated the nutrient concentration compared with that observed during the HHT hours. The ratio of nutrient concentration is found to deviate significantly from the Redfield ratio. The abundance of DIP is much higher compared with that of DIN and DSi.The anthropogenic sources of DIP from the upstream flow(especially the domestic effluent of several metropolises) can be mainly attributed behind such an observation. In order to characterize and establish the trend of such variation in such an important bio-climatic region, long-term and systematic ecosystem monitoring in the coastal water of the n Bo B northern Bay of Bengal should be carried out throughout the year. 相似文献
10.
In order to realize the spatiotemporal variations of benthic macrofaunal communities at the "Amphioxus Sand"habitat, six surveys including four seasons and three consecutive summers(i.e., 2014, 2015 and 2016) were conducted in two core sites, i.e., Huangcuo(HC) and Nanxian-Shibaxian(NX), in the Xiamen Amphioxus Nature Reserve in China. A total of 155 species of macrofauna were recorded, therein, polychaetes were dominant in terms of species number and density. Significant spatiotemporal variations of macrofaunal communities were observed. The density of polychaetes and the biomass of molluscs in the HC site were higher than those in the NX site. Macrofauna were more diverse and abundant in the cold seasons(winter and spring) than that in the warm seasons(summer and autumn). The annual variations of macrofaunal communities may be attributed to the changes in sediment texture among the three years of the survey. The variations in macrofaunal communities were mainly related to the proportion of polychaetes within the community. In addition, the density of amphioxus(include Branchiostoma japonicum and B. belcheri) was negatively correlated to that of polychaetes, bivalves, and crustaceans. Amphioxus was less likely to be found in the sediments with higher silt and clay content. Five biotic indices including Margaref's richness index(d), Peilou's evenness index(J′), Shannon-Wiener diversity index(H′),AMBI and M-AMBI were calculated in the present study. AMBI seems suitable in assessing benthic health at the"Amphioxus Sand" habitat, and a potential risk of ecological health in Xiamen Amphioxus Nature Reserve should be aware. 相似文献
11.
《海洋学报(英文版)》1990,(2)
-This paper first presents a new potassium reagent and efficient enrichment agent for direct recovery of potassium from seawater, i. e. , 1, 2, 4, 5-tetrahydroxybenzen -O, O' , O", O''- tetraacetic acid (TTAH4). The synthetic method of TTAH4, its enrichment behaviour for potassium ion in low concentration solution and seawater, and the chemical structure of its corresponding potassium salt have been investigated. A mechanism which caused the uptake of potassium ion is suggested. Elementary analysis and IR-spectrum determination of the potassium salt proved correct evidence for a polynuclear complex, i. e. , (TTAH3K)n. Thus, the mechanism which caused the uptake of potassium ion may be interpreted in terms of the formation of polynuclear chains as a continual sandwich type coordination complex. 相似文献
12.
In this paper, the hydrodynamic efficiency of a floating breakwater system is experimentally studied by use of physical models. Regular waves with wide ranges of wave heights and periods are tested. The efficiency of the breakwater is presented as a function of the wave transmission, reflection, and energy dissipation coefficients. Different parameters affecting the breakwater efficiency are investigated, e.g. the number of the under connected vertical plates, the length of the mooring wire, and the wave length. It is found that, the transmission coefficient kt decreases with the increase of the relative breakwater width B/L, the number of plates n and the relative wire length l/h, while the reflection coefficient kr takes the opposite trend. Therefore, it is possible to achieve kt values smaller than 0.25 and kr values larger than 0.80 when B/L is larger than 0.25 for the case of l/h-1.5 and n=4. In addition, empirical equations used for estimating the transmission and reflection coefficients are developed by using the dimensionless analysis, regression analysis and measured data and verified by different theoretical and experimental results. 相似文献
13.
Organic matter in cobalt-rich crust(CRC) from the Marcus–Wake Seamounts of the western Pacific Ocean, Sample CM1D03, has been analyzed to understand the source, geochemistry and mineralization of organic matter, and the mineralization environment. Biomarkers, including n-alkanes, isoprenoids, terpanes and sterols, have been detected in various layers of the CRC sample, using gas chromatography(GC) and gas chromatography–mass spectrometry(GC–MS). The content of organic carbon(OC) and its stable isotope(δ13C), and the combined features of the biomarkers show that the mineralized organic matter in CM1D03 CRC was mainly derived from microorganisms and lower plankton(e.g., bacteria and algae, respectively) from marine surface water, with some terrestrial higher plant components. The ratio of chloroform bitumen "A": OC was high in the CRC, between 10.51 and 20.66, showing significant migration characteristics of n-alkanes. Four mineralization categories of organic matter were recognized based on GC chromatograms of n-alkane molecules:(1) primitive type(bacteria and algae), which is characterized by moderately mature of n-alkanes preserving the original characteristics of the organic matter from microorganisms and lower plankton;(2) microbial degradation type, which is characterized by low contents of n-alkanes and rising baseline in the chromatogram, with the "bulge" being the products of organic matter by biodegradation;(3) organic matter migration type, which is characterized by low carbon number of n-alkanes with n C18 as the main peak carbon, without odd even predominance, and low concentrations of isoprenoids and hydrocarbons with high carbon number; and(4) organic matter hydrothermal type, which is characterized by relatively low concentration of small molecular weight n-alkanes, pristane, and phytane, accompanied by higher concentration of n-alkanes with carbon number greater than n C18. This study shows that biomarkers can record controlling factors of mineralization and their variation. 相似文献
14.
The forms distribution of Zn, Cd, Pb and Cu in waters of the Northwest Bohai Gulf is investigated by inverse polarography of anti-adsorption physically coated mercury film electrode, the higher content of most forms of trace metals is in polluted estuary water, and unstable Zn and Pb are in anomalous distribution. The average concentrations read ΣZn 20.0μg/1 (14.5-36.6 μg/l, ΣCd 0.11pg/1 (0.080-0.14μg/1), ΣPb 1.0μg/1 (0.58-1.6 μg/1), and ΣCu 5.2μg/1) (2.37-8.43 μ/1) respectively. 相似文献
15.
The effects of temperature and different forms of nutrients on Chattonella marina growth have been investigated in strains isolated from the Daya Bay,the South China Sea.The strain of C.marina preferred high temperatures, with an optimal temperature of 25°C,and 18 °C was the minimum for its survival.Higher cell number and growth rate were obtained in high nitrogen and phosphorus concentrations (500 μ g/L, 74 μ g/L) than under nutrient limitation.Nitrogen influenced the growth most, as the specific growth rate and maximum cell density were lower in nitrogen-limited cultures than noted under phosphorus limitation or under limitation from both.C.marina was capable of using many kinds of organic nitrogen sources including L-serine (L-Ser),glycine (Gly),alanine (Ala),L-threonine (L-Thr), glutamic acid (Glu) and urea, but could not utilize uric acid.Various forms of organic phosphorus compound such as glucose-6-phosphate (G6P),sodium glycerophosphate (GYP),adenosine triphosphate (ATP),adenosine monophosphate (AMP),cytidine monophosphate (CMP),guanosine monophosphate (GMP),uridine monophosphate (UMP),4-nitrophenylphosphate (NPP) and triethyl phosphate (TEP) supported the growth as well. Algal cells had the ability to sustain growth under nitrogen-and/or phosphorus-free conditions particularly under phosphorus depleted condition.These results led to the hypothesis that high loading of nitrogen has played an important role in frequent C.marina blooms in the past decade,and its capability for utilization of diverse forms of organic nutrients and growth in low nutrient conditions make this species a likely recurrent dominant in the Daya Bay phytoplankton assemblages,visible as 相似文献
16.
1 IwrRODUcrIONAn initial field of wave height in a computing domain is needed fOr integration ofnumerical wave model. Because real time. observation ocean data are scarce, now most ofinitial fields of ocean wave is produced by either reckoning wind fields or preceding 24hour prediction results. It is possible to form an initiaI field of ocean wave along with the..increasing satellite data, ship report and buoy data. Some of research works have beendone abroad (Janssen et a1, l989; LionelI… 相似文献
17.
Li Luping 《海洋学报(英文版)》1997,16(1):45-56
In this paper, it is held that the universal relationships of wave growth in fetch-limited conditions , i. e.,(f|~) p=A(x|~)-Band (m|~)0= C(x|~) Dshould satisfy the Toba 3/2 power law and the wave energy balance equation. In the ideal generation situation, theoretically it can be derived that the ideal fetch-limited wave growth relationship should have D=3B and D B =1, (i.e., B = 0.25, D = 0.75 ) and A3C=2. 1×l(T4C~(1/2)_d , where Cd is the drag coefficient. The 3/2 power law, the wave energy balance equation and the decrease of wave steepness with increasing fetch have became three requirements which should be satisfied by fetch-limited wave growth algorithms. A semi-empirical and semi-theoretical model for fetch-limited wave growth is presented. In the application to the slanting wind situation an un(?)ersal relationship of dimensionless wave energy vs dimensionless peak frequency is presented and the comparisons show that the model is in good agreement with observations. 相似文献
18.
《海洋学报(英文版)》1992,(1)
In this paper, on the basis of the heat conduction equation without consideration of the advection and turbulence effects, one-dimensional model for describing surface sea temperature ( T1), bottom sea temperature ( Tt ) and the thickness of the upper homogeneous layer ( h ) is developed in terms of the dimensionless temperature θT and depth η and self-simulation function θT - f(η) of vertical temperature profile by means of historical temperature data.The results of trial prediction with our one-dimensional model on T, Th, h , the thickness and gradient of thermocline are satisfactory to some extent. 相似文献
19.
Catalase is an important antioxidant protein that can protect organisms against various forms of oxidative damage by eliminating hydrogen peroxide. In this study, the catalase c DNA of Paphia textile(Pt CAT) was cloned using RTPCR and rapid amplification of c DNA ends(RACE). Pt CAT is 1 921 bp long and consists of a 5′-UTR of 50 bp, a 3′-UTR of 349 bp, and an ORF of 1 542 bp that encodes 513 amino acids with a molecular weight of 58.4 k D and an estimated isoelectric point of 8.2. Sequence alignment indicated that Pt CAT contained a highly conserved catalytic signature motif(~(61)FNRERIPERVVHAKGAG~(77)), a proximal heme-ligand signature sequence(~(352)RLFSYSDP~(359)), and three catalytic amino acid residues(H~(72), N~(145), and Y~(356)). Pt CAT also contains two putative N-glycosylation sites(~(34)NKT~(36) and ~(437)NFT~(439)) and a peroxisome-targeting signal(~(511)AQL~(513)). Furthermore, Pt CAT shares 53%–88% identity and 29%–89% similarity with other catalase amino acid sequences. Pt CAT m RNA was present in all tested organs, including the heart, digestive gland, adductor muscle, gonad, gill, and mantle, but its expression was highest in the digestive gland. High-temperature-induced stress produced two expression patterns of Pt CAT m RNA: first, an initial up-regulation followed by a down-regulation in the heart, digestive gland, and gonad and, second, consistent down-regulation in all other organs. These results demonstrate that Pt CAT is a typical member of the catalase family and might be involved in the responses to harmful environmental factors. 相似文献
20.
Bacterial production is one of the key parameters to evaluate bacterial role in ocean carbon fluxes.Estimation of bacterial production requires the leucine-to-carbon conversion factors that change widely across environments.However,empirical leucine-to-carbon conversion factors(e CFs) are seldom determined in situ because of time consuming and little is known on regulating factors for the e CFs.During May 2015 to January 2016,fourteen dilution experiments were conducted,from the Zhujiang(Pearl River) Estuary to the coast of the northern South China Sea,to determine spatiotemporal variability in the e CFs and its potential controlling factors along an environmental gradient.The e CFs showed clear spatial variations with the highest(1.27–1.69(kg C)/(mol Leu)) in low salinity waters(salinity15),intermediate(1.03–1.25(kg C)/(mol Leu)) in moderate salinity(salinity of 15–25),and the lowest(0.48–0.85(kg C)/(mol Leu)) in high salinity waters(salinity25).Substrate availability was responsible for spatial variability in the e CFs.In the pristine coastal waters,low e CFs was related to substrate limitation and leucine incorporated was respired to maximize the survival rather than bacterial production.Hence,the e CFs measurement was needed for estimating bacterial production accurately in various marine environments. 相似文献