The behaviour of ⁵⁹Fe in marine microhabitat     

Cai Fulong  Chen Ying  Xu Pi''an  Oiu Manhua 《海洋学报(英文版)》1989,8(3):423-429

Under the artificial condition the 59Fe morphology in sea water, its concentration in sediment and phytoplankton, its distribution and metabolism in tissue organs of marine animals were studied. The results showed that the morphology of 59Fe was in a particulate state in sea water. The adsorption rule of 59Fe by three kinds of sediments was similar. The concentration ability of 59Fe by phytoplankton was very strong. The critical concentration organs of S9Fe by marine animals were viscera. The gross radioactivity of 59Fe was mainly concentrated in protein. The concentration factor of 59Fe by DNA was the highest one. After excretion experiment, 59Fe of all the tissue organs was not detected. Small part of59Fe remained in the organic acid and protein state. There was a redistribution process in sediment for59Fe.  相似文献   

温度、pH对缢蛏(Sinonovacula constricta)消化酶活力的影响   总被引：8，自引：0，他引：8  

范德朋  潘鲁青  肖国强  马甡  董双林 《海洋湖沼通报》2003,(4):69-73

本文研究了温度、pH对缢蛏(Sinonovacula constricta(Lamarck))三种主要消化酶(蛋白酶、淀粉酶和纤维素酶)活力的影响。结果表明：当温度在5～75℃之间时，蛋白酶、纤维素酶和淀粉酶的最适温度分别为为55℃、45℃和65℃；在不同的pH范围内，蛋白酶的最适PH值为9．2，淀粉酶的最适PH值为6．3和7．7，纤维素酶的最适PH值为5．2。缢蛏的淀粉酶和蛋白酶活力较大，纤维素酶活力极微。  相似文献   

优选沙子口污水处理厂排海口位置的研究          下载免费PDF全文

单宝田  王志刚  杜春梅  马丽 《海洋科学》2003,27(2):13-15

对青岛沙子口污水处理厂排海口位置进行了水动力条件、混合区域海水交换率及更新周期、污染物扩散系数及浓度分布、水质点迁移轨迹的比较，确定了其最佳排海口位置方案。  相似文献   

地形坡度对多金属结核分布的控制作用   总被引：3，自引：3，他引：3  

王英  李家彪  韩喜球  吴自银 《海洋学报》2001,23(1):60-65

选取我国东太平洋多金属结核开辟区内的一个区域作为研究区,利用人工神经网络中应用最为广泛的BP网络,建立控制多金属结核分布的地质因素与多金属结核分布之间的映射关系,探讨地形坡度对多金属结核分布的控制作用.结果表明,在经度、纬度、水深、坡度四个因素中,坡度对结核分布影响程度最大;多金属结核主要分布于坡度小于5°的地方;当坡度小于5°时,丰度与地形坡度呈正相关,品位与地形坡度呈负相关,丰度与品位呈负相关;品位与坡度似呈指数关系,坡度增大,品位降低.  相似文献   

栉孔扇贝升温育苗高产技术   总被引：1，自引：0，他引：1  

于瑞海  徐承阳 《海洋湖沼通报》1992,(2):68-71

在栉孔扇贝升温育苗中,主要改进了亲贝升温促熟培育、产卵与孵化、选幼、幼虫培育等主要技术措施,在105m~3水体中,培育出商品苗85,000,000多粒,取得了可喜的经济效益。  相似文献   

浒苔(Enteromorpha prolifera)生活史的初步研究   总被引：39，自引：0，他引：39  

王晓坤  马家海  叶道才  陈孝德 《海洋通报》2007,26(5):112-116

通过实验室培养实验,全面地观察描述了浒苔生活史各个阶段的发育情况。雌雄异体的配子体成熟后,放散双鞭毛的配子,雌雄配子结合成合子进而发育成孢子体,配子也可以进行单性生殖发育成膜状的配子体。孢子体成熟放散四鞭毛的游孢子,游孢子固着后,可直接发育成配子体。其生活史是单倍体的配子体与二倍体的孢子体相互交替的同形世代交替。雌雄配子具有正趋光性,易大量聚集,结合后同游孢子一样都呈负趋光性。  相似文献   

腾格里沙漠西北缘湖泊沉积记录的全新世中期气候环境   总被引：4，自引：0，他引：4  

隆浩  马海州  王乃昂  李育  王晨华 《海洋地质与第四纪地质》2007,27(3):105-111

通过腾格里沙漠西北缘青土湖沉积物粒度、有机碳、碳酸盐、碳氮比和有机质稳定同位素等多项沉积学气候代用指标及精确定年的综合分析,建立了该区域全新世中期9.0~3.0 cal.kaBP的古气候演化序列。结果表明,9~7.8 cal.kaBP期间,区域的水分条件和温度逐渐上升,植被状况好转,此阶段属于全新世早期向全新世暖湿期转变的过程;而在7.8~7.5 cal.kaBP期间出现了显著的百年尺度的干旱事件,沉积物主要以砂质沉积为主,此时湖泊生产力显著下降;全新世期间最为暖湿的气候适宜期出现在7.5~5.0 cal.kaBP;5.0 cal.kaBP以来,该区域出现了较为明显的干旱化趋势。  相似文献   

Stokes波的谱特性分析     

马汝建  李桂喜 《海洋工程》2001,19(4):52-57

应用理论推导及数值计算方法，对Stokes随机波的谱特性进行了分析。首先将波面方程，海水质点水平速度用一阶波面分量的非线性组合表示，应用平稳随机高阶短的降阶计算法则，得到了波面方程及海水质点水平速度与一阶波面分量的自相关函数之间的关系，从而确定了Stokes随机波浪的波浪谱密度及海水质点水平速度和加速度谱密度，进而求得有关波浪要素的均方根值。文章还应有数值计算方法，分析了波浪基本参数对均方根值的影响。  相似文献   

Research on Characteristics of Density Current Under the Action of Waves     

Li Dashan  Shen Ying  Ren Rushu Chen Yao Senior Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing Associate Professor  Hohai University  Nanjing Master  Hohai University  Nanjing 《中国海洋工程》1997,(1)

In this paper,the characteristics of density current under the action of waves are describedwith the help of flume experiment and theoretical analysis.The study shows that turbid water under the ac-tion of the waves can present three types of motion,i.e.significant stratification,fragile stratification andstrong mixing.The motion of turbid water presents significant stratification when(H/D)/△ρ/ρ~(1/2)≤4.5,generally this state is known as density current.The formulas of motionvelocity,thickness,and discharge of density current moving on horizontal bottom are derived by use of ba-sic equations such as momemtum equation,equation of energy conservation and continuity equation offluid.The time-average velocity and the thickness of density current under the action of waves have a rela-tionship with such parameters as relative density(△ρ/ρ),wave height(H),and water depth(D).Whenthese parameters are determined,the time-average thickness and motion velocity of density current are al-so determined.The relat  相似文献   

The impact of several chemical poisons on the absorbing ⁴⁵Ca by the Arca granosa     

Cai Fulong  Chen Ying  Huang Lingyi 《海洋学报(英文版)》1992,11(3):435-440

The impact of several chemical poisons on the Arca granosa absorbing 45Ca was studied. The results showed that the absorption of 45Ca in the blood and the soft tissue by Arca granosa was inhibited by the inorganic compounds of Cu, Zn, Pd, Cd, Hg and so on, among which the inhibition of Cd was the strongest, next was that of Cu and Hg. But the inhibition of the absorption of 45Ca in the shell of Arca granosa was little. The impact of three kinds of energy metabolism inhibitory substances on the absorption of 45Ca by the Area granosa showed that the absorption was an active transfer process.  相似文献