华贵栉孔扇贝三倍体的研究   总被引：2，自引：1，他引：2  

曾志南  陈木等 《台湾海峡》1995,14(2):155-162

本文报道了用细胞松驰素B、高温和低温休克等方法诱导华贵栉孔扇贝（Chlamys nobilis）三倍体的实验结果。在26.0～28.0℃条件下，选用不同浓度的细胞松驰素B0.1、0.3、0.5、0.7和1.0mg/dm^3，在受精后15min，处理受精卵15min，三倍体诱导率分别为12.5%、37.5%、68.0%、66.6%和81.0%，其中0.5～1.0mg/dm^3浓度的细胞松驰素B对改变倍性最有效。高温休克选用31.0、33.0、35.0和37.0℃处理受精卵，最高三倍体诱导率达46.7%（33.0℃,处理15min）。低温休克选用6.0、8.0、10.0和12.0℃处理受精卵，最高三倍体诱导率为40.7%（10.0℃，处理20min）。实验结果表明，随着处理强度的增大和处理时间的延长，三倍体诱导率增高、但孵化率下降，畸型率上升。用高温休克处理的实验组幼虫生长速度较对照组快。作者认为，在商业性生产中，温度休克是诱导扇贝三倍体的一种简便、有效的方法。文中还就细胞松驰素B与温度休克诱导三倍体的机制进行了讨论。  相似文献   

The concentration and distribution of dimethyl sulfide in the marine atmospheric boundary layer near the equator     

Li Xingsheng  Li Zhe  F. Parungo  C. Nagamoto 《海洋学报(英文版)》1995,14(3):355-369

Ｔｈｅｃｏｎｃｅｎｔｒａｔｉｏｎａｎｄｄｉｓｔｒｉｂｕｔｉｏｎｏｆｄｉｍｅｔｈｙｌｓｕｌｆｉｄｅｉｎｔｈｅｍａｒｉｎｅａｔｍｏｓｐｈｅｒｉｃｂｏｕｎｄａｒｙｌａｙｅｒｎｅａｒｔｈｅｅｑｕａｔｏｒ￥ＬｉＸｉｎｇｓｈｅｎｇ；ＬｉＺｈｅ；Ｆ．Ｐａｒｕｎｇｏ...  相似文献   

底部边界层颗粒态物质迁移特征的放射性核素分析方法     

李炎  G.W.Berger 《海洋科学》1992,16(4):66-68

利用颗粒态放射性核素携带的颗粒物历经过程信息,我们提出用泥沙扩散方程和颗粒态放射性核素扩散方程联解底部边界层颗粒态物质迁移参数的方法。分析实例的样品取自荷兰Waden Sea南部Balgzand潮滩(砂坪)和Mok湾潮滩(泥坪)的两个站位(BG1和Mok2)。示踪核素为~(234)Th,~(210)Pb和~(137)Cs,其放射性比度由r能谱测出。  相似文献   

厦门湾有色溶解有机物的光吸收特性研究   总被引：3，自引：0，他引：3  

李猛  郭卫东  夏恩琴  韩宇超  胡明辉 《热带海洋学报》2006,25(1):9-14

研究了厦门湾九龙江河口区、西海域、同安湾及东侧水道海水中有色溶解有机物(CDOM)的光吸收特性,分析了CDOM的河口行为,并讨论了CDOM光吸收特性与其荧光性质之间的关系。结果表明,厦门湾表层海水CDOM光吸收系数a(355)的水平分布表现为河口区最高、东侧水道最低、西海域和同安湾介于两者之间,底层水a(355)的分布与表层基本相似,表明陆源河流输入是厦门湾CDOM的主要来源;a(355)的垂直分布为表层高于底层,主要受水文和生物因素控制。厦门湾表层水CDOM光谱斜率S的平均值介于0.014—0.018nm-1,但河口低盐度区S值较小,反映陆源腐殖质的影响。a(355)在河口混合中呈保守行为,表明CDOM具有良好的保守性质。CDOM的吸收系数a(355)与其荧光强度之间表现为较好的相关关系,指示可以用灵敏度更高的荧光方法来研究CDOM的分布和行为。  相似文献   

Steady Response of a Ventilated Thermocline to Enhanced Ekman Pumping     

Atsushi Kubokawa  Shang-Ping Xie 《Journal of Oceanography》2002,58(4):565-575

The steady response of the ventilated thermocline to an increase in Ekman pumping is investigated, focusing on the effect of the mixed layer depth distribution on the subsurface density anomaly. We consider only the subtropical gyre, and the mixed layer is assumed to be deep in the northwest and shallow elsewhere with a narrow transition zone separating the deep and shallow mixed layer regions. At the intersection of this narrow transition zone and the outcrop line, low potential vorticity fluid is subducted into and ventilates the thermocline. In such a situation, an enhancement of the Ekman pumping confined to the northern subtropical gyre leads to pronounced subsurface cold anomalies in the southern subtropics, which is free of anomalous forcing. These density anomalies are much greater than those that occur when either the mixed layer depth is zonally uniform or the Ekman pumping is enhanced in the whole subtropical gyre. They are caused by anomalous changes in the trajectory of the low potential vorticity fluid in response to anomalous Sverdrup flow. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Wave-induced porewater pressure in a seabed with inhomogeneous permeability     

Toshikazu Kitano  Hajime Mase 《Ocean Engineering》2001,28(3)

We have developed an analytical treatment for the wave-induced response of a seabed with inhomogeneous permeability, by employing the boundary layer approximation. By assuming an exponential function for vertically distributed permeability, the inhomogeneous consolidation equation was formulated as Bessel's differential equation. Subsequently, we proposed some representative quantities for examining the effects of inhomogeneity of permeability. The main effects of inhomogeneity are that the boundary layer becomes thinner and the phase delay in the direction of depth becomes larger as the inhomogeneity becomes significant. In addition, it was shown that the boundary layer is properly evaluated by using the averaged permeability.  相似文献   

滇西地区地壳上地幔电性结构与地壳构造活动的关系   总被引：46，自引：3，他引：43       下载免费PDF全文

孙洁  徐常芳 《地震地质》1989,11(1):35-45

本文根据滇西地区18个大地电磁测深点资料的数据处理和分析结果,对测区深部导电率在纵、横向上的变化特征进行了研究。结果表明:滇西地区深部电性为多层结构,大致可分四至五个电性结构层;深部电性结构横向变化大,明显受区域构造控制;该区上部地壳内普遍存在低阻层;上地幔高导层明显存在两个隆起区,一个以剑川—鹤庆为中心呈北北西向展布的隆起区,另一个以腾冲—潞西为轴呈南北向展布的隆起区。 本文还讨论了地壳上地幔电性结构与大地构造的关系,滇西北裂陷区盆地的形成,以及该区地震活动与深部构造的关系  相似文献   

大庆长垣外围特低渗透扶杨油层CO_2非混相驱油试验研究   总被引：2，自引：0，他引：2  

姜洪福  雷友忠  熊霄  闫丽萍  皮蔚峰  李秀娟  于长焕 《现代地质》2008,22(4)

大庆长垣外围有3×108t特低渗透的扶杨油层储量在注水开发条件下难以有效动用,为提高这部分储量的有效动用率,开展了CO2非混相驱油试验研究。PVT测试结果表明,扶杨油层原油较稠,体积系数小,膨胀性和收缩性小,溶解系数较低;CO2驱油细管实验最小混相压力为29 MPa,比原始地层压力高8.6 MPa,现场试验为非混相驱;长岩心实验CO2驱油采收率比注水高4~6个百分点。综合室内可行性评价实验结果看,大庆长垣外围扶杨油层开展CO2驱油试验是可行的,并于2003年初在宋芳屯油田南部开辟了注气试验区,有注气井1口,采出井5口。矿场试验结果表明,CO2驱油能够使特低渗透、裂缝不发育的扶杨油层建立起有效驱动体系,从根本上改善其开发效果,该技术有望成为特低渗透扶杨油层有效动用的可行技术。  相似文献   

直流电测深法与中心回线瞬变电磁法联合反演   总被引：2，自引：0，他引：2  

杨云见  何展翔  王绪本  罗卫锋 《物探与化探》2008,32(4):442-444

分析了直流电测深法(VES)与中心回线瞬变电磁法(TEM)对地层的响应特征,结果显示:TEM对低阻层反应灵敏,而VES对高阻层具有较高的分辨能力。基于TEM与VES对地层响应特征互补的特点,尝试将TEM与VES数据进行联合反演,模型试算结果表明,联合反演的效果明显比单一方法反演的效果好。  相似文献   

Using spectral information from the NIR water absorption features for the retrieval of canopy water content     

J.G.P.W. Clevers  L. KooistraM.E. Schaepman 《International Journal of Applied Earth Observation and Geoinformation》2008

Canopy water content (CWC) is important for mapping and monitoring the condition of the terrestrial ecosystem. Spectral information related to the water absorption features at 970 nm and 1200 nm offers possibilities for deriving information on CWC. In this study, we compare the use of derivative spectra, spectral indices and continuum removal techniques for these regions. Hyperspectral reflectance data representing a range of canopies were simulated using the combined PROSPECT + SAILH model. Best results in estimating CWC were obtained by using spectral derivatives at the slopes of the 970 nm and 1200 nm water absorption features. Real data from two different test sites were analysed. Spectral information at both test sites was obtained with an ASD FieldSpec spectrometer, whereas at the second site HyMap airborne imaging spectrometer data were also acquired. Best results were obtained for the derivative spectra. In order to avoid the potential influence of atmospheric water vapour absorption bands the derivative of the reflectance on the right slope of the canopy water absorption feature at 970 nm can best be used for estimating CWC.  相似文献