Effect of nitrogen and phosphorus on the growth of a red tide dinoflagellateScrippsiella trochoidea (Stein) Loeblich III     

Qin Xiao-ming  Qian Pei-yuan  Zou Jing-zhong 《中国海洋湖沼学报》1999,17(3):212-218

Scrippsiella trochoidea (Stein) Loeblich III was grown in a nitrogen-or phosphorus-limited batch culture system in laboratory. Growth rates and cellular Chl-a were measured as functions of nitrate and phosphate concentrations. Growth rates were hyperbolic with both nitrate and phosphate concentration and fit the Monod equation. The minimum cell quota of nitrogen and phosphorus and then the optimum N∶P ratio ofS. trochoidea were estimated in this study. Measurement of phosphate concentration in Jiaozhou Bay suggest that phosphorus is the limiting factor ofS. trochoidea growth. Contribution No. 3679 from the Institute of Oceanology, Chinese Academy of Sciences. Project 39790110 supported by NSFC, the study aslo supported by the National Climbing Project B (PDBG-7-2) and partly supported by an MF grant from Hong Kong University of Science and Technology.  相似文献   

Disease resistance and humoral immunomodulatory effects of vitamin C on grouper,Epinephelus awoara     

Qin Qi-wei  Wu Zao-he  Pan Jin-pei 《中国海洋湖沼学报》2000,18(3):247-252

The disease resistance and humoral immunomodulatory effects of vitamin C administered orally to grouper,Epinephelus awoara maintained on a frozen fish diet supplemented with vitamin C at 500, 1000, 1500 and 2000 mg/kg were investigated. After 20 weeks, the growth rates of the groups with high level of vitamin C apparently increased. The untreated fish had symptoms of vitamin C deficiency. The endogenous liver tissue vitamin C levels were found to reflect well the dietary treatments. After intraperitoneal injection or bath challenge with a virulent strain ofVibrio vulnificus, fish fed with high level vitamin C showed significantly higher survival rate compared with the normal control group. Vaccination with formalin inactivatedV. vulnificus significantly enhanced the specific antibody production in fish treated with vitamin C, and completely protected from strong bacterial challenge the groups fed on fish with vitamin C 1500 and 2000 mg/kg diet. Project 39500113 supported by NSFC and also by Guangdong Science Research Foundation (Grant No. 950711).  相似文献   

THE RELATIONSHIP BETWEEN INLAND LAKES EVOLUTION AND CLIMATIC FLUCTUATION IN ARID ZONE   总被引：2，自引：0，他引：2  

秦伯强  施雅风  王苏民 《中国地理科学(英文版)》1991,1(4):316-323

The evolution of the inland lakes in arid and semi-arid zones is accorded with the climatic fluctuation. The humid climate is in harmony with the higher water level and greater lake water quantity budget while arid climate is in correspondence with the lower water level and little water budget. Based on the analysis of the lake fluctuation and lake budget change, with the aid of the data of geom'orphology, palynology, sedimentology and chronology, It is found that the climate experienced a warm and humid period during 7000-3500 yr. B. P. and showed a drying and warming trend in the last century in the Central Asia.  相似文献   

四川龙门山泥盆纪四射珊瑚     

秦洪宾  蒋飞虎 《地球科学与环境学报》1991,(1)

本文记述了产于四川龙门山地区中、上泥盆统界线附近观雾山组和土桥子组的四射珊瑚。在大量珊瑚标本鉴定的基础上,建立了中泥盆世晚期至晚泥盆世初期的四个四射珊瑚化石组合。根据四射珊瑚的演化规律,确定以Peneckiella珊瑚类的兴起和Pseudozaphrentis hejiazhaiensis,Temnophyllun(Truncicarinulum)beichua-nensis珊瑚类的消失作为龙门山地区识别中、上泥盆统界线的标志。  相似文献   

NUMERICAL MODELING OF CUMULUS CLOUD CHEMISTRY—PART Ⅰ.MODEL DEVELOPMENT     

赵春生  秦瑜 《Acta Meteorologica Sinica》1996,(3)

A one-dimensional cumulus cloud chemistry model(1CCCM)is developed to simulate cloudphysical processes and chemical processes during the evolution of a convective cloud.The cloudphysical submodel includes a detailed microphysical parameterized scheme of 20 processes.Thechemistry submodel is composed of three parts:gas phase chemistry,aqueous phase chemistry andscavenging of soluble gases.The gas phase reaction mechanism contains 85 reactions among 45species including 13 organics.The aqueous phase reaction mechanism contains 54 reactions among40 species and 12 ion equilibria.Mass of 19 gases is transported between the gas phase and theaqueous phase.With this model,studies may be made to analyze the interactions among processesduring lifetime of a cumulus cloud.  相似文献   

GPS/LEO掩星技术中超折射效应的修正   总被引：4，自引：3，他引：1  

严豪健  郭鹏  洪振杰  刘敏 《天文学报》2004,45(4):437-446

在GPS掩星探测地球大气技术中，Abel积分变换要求大气折射指数n是折射半径a的单值函数，当大气折射率的垂直梯度达到小于一个极限值dN／dr≈-0．16N-unit m^-1上述单值性不成立，称其为超折射，此时Abel积分变换不再适用,如果还是在形式上应用经典的Abel变换，在反演结果中就会产生负大气折射率偏差．描述了低对流层中超折射现象的物理特性和数学表示；在广义Abel积分变换的基础上，讨论了超折射层内和超折射层下的大气剖面反演算法；选择了一个简单的采样间隔内等大气折射率垂直梯度假设，对英国高分辨率无线电探空观测资料进行模拟计算，验证了负超折射与大气折射率偏差的关系，并提出的广义Abel变换的合理性.  相似文献   

渤海平均海平面及多年一遇极值水位的计算     

颜秀花  周良明  林霄佩  王爱方 《海洋科学进展》2008,26(2):135-144

利用区域大气模拟系统(RAMS)大气模式给出的30 a风场资料作为上边界风应力强迫,用普林斯顿大洋模式(POM)对渤海的潮流和潮位进行了30 a数值计算.给出了M2,S2,O1,K1四个分潮的同潮时线和等振幅线,与环渤海19个验潮站观测的调和常数对比发现,M2分潮振幅的平均误差为4.5 cm,迟角的平均误差为4.2°.分析了渤海海域环流、风海流和潮流的基本特征,并与前人的结果进行比较,两者基本一致.计算了渤海1 000多个网格点的平均海平面高度,比较结果表明,其准确度较高.最后给出了渤海各点的最高和最低天文潮位以及百年一遇极值水位,比较结果表明,虽没有进行单独的风暴潮计算,但计算结果较好地反映了渤海各种水位的特征.  相似文献   

重力异常辅助惯性导航中匹配区提取方法     

马旭东  闫利  乔永杰 《测绘科学技术学报》2009,26(6)

由于重力场中的重力异常数据是以格网的形式表示的,它与地形的DEM在数据结构上有一定的相似性.因此可借鉴一些数字地形分析的方法,提取重力场的特征区域(匹配区)用于辅助惯性导航.首先,对重力场进行特征提取,通过对特征的比较分析选取其中的某些因子作为重力场特征因子;然后,利用等值线方法对重力场特征数据进行区域分割,提取栅格特征数据区域的矢量边缘,并对这些矢量表示的区域进行聚类处理;最后,利用凸壳算法提取这些区域的凸壳范围线,获得重力异常变化比较显著的区域(匹配区).从而为重力匹配辅助导航提供了必要的参考数据.  相似文献   

济南市建成区扩展的时空特征及驱动力分析     

陈淑兴  韩波  柯长青  闫弘文 《地理空间信息》2009,7(5):117-120

以山东省济南市为例，以1979—2005年5个不同时相的遥感图像为数据源，利用遥感信息提取技术，获取了城市扩展的空间信息。结合济南市社会经济统计数据，从扩展方向、重心转移等方面综合分析了济南市建成区扩展的时空特征，并从人口、经济、地理区位、政策导向等4个方面探讨了城市扩展的驱动力。结果表明，济南市城区扩展的整体趋势是东西向的带状扩张，向东扩张明显，城市重心向东北方向转移；1979年济南市城区面积是52．7km^2，2005年达到311．6km^2，是1979年的5．9倍。  相似文献   

有害赤潮与原生动物相互作用的研究进展     

张利永  颜天  周名江 《海洋科学》2008,32(10):86-92

近年来有害赤潮在全世界频繁爆发，规模也呈逐渐增大的趋势，其对海洋生态系统结构和功能的影响，引起了广泛关注。原生动物是海洋生态系统中微食物环的重要组分，通过其摄食，可以将中型浮游动物难以摄食的有机颗粒、微型浮游植物和微微型浮游生物连接到高级消费者。由于形成有害赤潮的浮游植物大都是细胞较小的微型浮游植物，因此，有害赤潮和原生动物的关系密切。  相似文献