尖刺拟菱形藻氮磷吸收动力学以及氮磷限制下的增殖特征   总被引：13，自引：1，他引：13  

张诚  邹景忠 《海洋与湖沼》1997,28(6):599-603

于１９９１年１１月有胶州湾采集尖刺拟菱形藻，以毛细管法分离纯化，建立克隆藻株，以此为实验材料，研究其在营养盐饥饿状态下对ＮＯ３－Ｎ，ＮＨ４－Ｎ和ＰＯ４－Ｐ的吸收动力学及在营养盐限制下的增殖特征。  相似文献   

One-dimensional numerical models of higher-order Boussinesq equations with high dispersion accuracy   总被引：3，自引：0，他引：3  

Zou Zhili  Wang Tao  Zhang Xiaoli  Darren Spratt 《海洋学报(英文版)》2003,22(2):287-299

Abstract-Nonlinear water wave propagation passing a submerged shelf is studied experimentally andnumerically. The applicability of the wave propagation model of higher-order Boussinesq equations de-rived by Zou(2000, Ocean Engneering, 27, 557～575) is investigated. Physical experiments areconducted; three different front slopes (1:10, 1:5 and 1:2) of the shelf are set-up in the experimentand their effects on the wave propagation are investigated. Comparisons of the numerical results withtest data are made and the higher-order Boussinesq equations agree well with the measurements since thedispersion of the model is of high accuracy. The numerical results show that the good results can also beobtained for the steep-slope cases although the mild-slope assumption is employed in the derivation of thehigher-order terms in the higher-order Boussinesq equations.  相似文献   

海水营养盐现场监测   总被引：10，自引：2，他引：10  

邹常胜 《海洋技术学报》2001,20(4):33-37

海水营养盐现场监测技术是90年代初发展起来的新技术。海洋技术研究所对这一技术进行了研究和探索，开发研制了营养盐现场自动分析仪，本文从该仪器的性能指标、工作原理、分析工艺流程、组成及工作方式做了较全面的介绍。  相似文献   

东海几种扇形珊瑚的数值分析     

邹仁林  孙修勤  陈国通 《海洋学报》1981,3(1):131-136

深水非造礁石珊瑚(Ahermatypic coral)中的扇形珊瑚属(Flabellum)在东海大陆架海区不仅数量多,而且是优势种.因扇形珊瑚属自第三纪的始新世至今都有生长,所以不但引起现代底栖生物学者的关注,而且也是第三、第四纪古生物工作者常常提及的种属.自Lesson 1831年建立Flabellum以来,不断有新种报导,但也有不少学者对这些新种提出异议,认为是同物异名,时时在合并.有分有合,意见纷纭.因此,这一属的种类庞杂,相当混乱.  相似文献   

地质二维矢量点符号的自动三维建模     

朱声荣  刘斌彬  陈飞翔  苏小慧 《测绘科学》2017,42(7)

针对传统的三维点符号库实现方法工作量大、扩展性差等问题,提出了直接从二维矢量点符号到三维点符号的自动建模方案。采用三维图元的设计思路,解决符号扩展性差的问题。借鉴二维矢量点符号的表达,来进行三维符号的设计与建模,是对二维符号库的资源再利用,有利于实现二三维符号库的统一。通过设计内存池及内存拷贝的优化策略来提高模型的可视化效率。实验结果表明,提出的方案不仅有较好的可视化效果,并且具有相关文件数据量小、符号的可扩展性好等优势,对三维GIS的符号库研究具有重要的参考价值。  相似文献   

Air Temperature Estimation with MODIS Data over the Northern Tibetan Plateau     

Fangfang HUANG  Weiqiang MA  Binbin WANG  Zeyong HU  Yaoming MA  Genhou SUN  Zhipeng XIE  Yun LIN 《大气科学进展》2017,34(5):650-662

Time series of MODIS land surface temperature(T_s) and normalized difference vegetation index(NDVI) products,combined with digital elevation model(DEM) and meteorological data from 2001 to 2012,were used to map the spatial distribution of monthly mean air temperature over the Northern Tibetan Plateau(NTP). A time series analysis and a regression analysis of monthly mean land surface temperature(T_s) and air temperature(T_a) were conducted using ordinary linear regression(OLR) and geographical weighted regression(GWR). The analyses showed that GWR,which considers MODIS T_s,NDVI and elevation as independent variables,yielded much better results [R_(Adj)~2 0.79; root-mean-square error(RMSE) =0.51℃–1.12℃] associated with estimating T_a compared to those from OLR(R_(Adj)~2= 0.40-0.78; RMSE = 1.60℃–4.38℃).In addition,some characteristics of the spatial distribution of monthly T_a and the difference between the surface and air temperature(T_d) are as follows. According to the analysis of the 0℃ and 10℃ isothermals,T_a values over the NTP at elevations of 4000–5000 m were greater than 10℃ in the summer(from May to October),and T_a values at an elevation of3200 m dropped below 0℃ in the winter(from November to April). T_a exhibited an increasing trend from northwest to southeast. Except in the southeastern area of the NTP,T d values in other areas were all larger than 0℃ in the winter.  相似文献   

基于多尺度空间聚类的江西省经济区域划分     

邹凤琼  张刚华 《地域研究与开发》2017,36(5)

经济区划是区域经济规划中的一个重要方面,以传统聚类方法进行的经济区划不能兼顾区划单元的属性特征与空间邻接性。运用基于尺度空间理论的空间聚类方法、综合区划单元的属性特征与空间邻接性,对江西省县域单元经济区划进行研究。结果表明:江西省可划分为五类经济区,分别是昌九经济区、赣东北经济区、赣西北经济区、赣中南经济区和赣南经济区,区划结果与江西省实际经济发展情况基本吻合。  相似文献   

Geographically weighted regression with parameter-specific distance metrics     

Binbin Lu  Chris Brunsdon  Martin Charlton  Paul Harris 《International journal of geographical information science》2017,31(5):982-998

Geographically weighted regression (GWR) is an important local technique to model spatially varying relationships. A single distance metric (Euclidean or non-Euclidean) is generally used to calibrate a standard GWR model. However, variations in spatial relationships within a GWR model might also vary in intensity with respect to location and direction. This assertion has led to extensions of the standard GWR model to mixed (or semiparametric) GWR and to flexible bandwidth GWR models. In this article, we present a strongly related extension in fitting a GWR model with parameter-specific distance metrics (PSDM GWR). As with mixed and flexible bandwidth GWR models, a back-fitting algorithm is used for the calibration of the PSDM GWR model. The value of this new GWR model is demonstrated using a London house price data set as a case study. The results indicate that the PSDM GWR model can clearly improve the model calibration in terms of both goodness of fit and prediction accuracy, in contrast to the model fits when only one metric is singly used. Moreover, the PSDM GWR model provides added value in understanding how a regression model’s relationships may vary at different spatial scales, according to the bandwidths and distance metrics selected. PSDM GWR deals with spatial heterogeneities in data relationships in a general way, although questions remain on its model diagnostics, distance metric specification, and computational efficiency, providing options for further research.  相似文献   

盐田水域多纹膝沟藻赤潮发生过程的生态学研究     

林永水  周近明  黎爱韶 《热带海洋学报》1993,(1)

本文报道1991年5月5—6日在广东大鹏湾盐田附近水域发生的多纹膝沟藻Gonyaulax polygramma赤潮。对多纹膝沟藻样品进行扫描电镜观察,阐述了赤潮发生过程中本种的数量变动。利用该次调查和1990年同期资料进行逐步回归分析,探讨多纹膝沟藻赤潮发生与环境因子的关系。  相似文献   

光合细菌在海湾扇贝人工育苗中应用的研究   总被引：4，自引：1，他引：4  

宫庆礼  缪国荣 《海洋湖沼通报》1995,(4):40-46

光合细菌是一类组份较全且营养价值较高的细菌。在缺氧弱光条件下，具有处理低分子有机物、净化水质等显著功效。本研究利用了光合细菌所具有的独特生理功能和生态习性，在海湾扇贝人工升温育苗过程中，以单胞藻为基础饵料适当添加光合细菌，增强了海湾扇贝整体营养水平和改善了育苗水体生态环境条件，促进了亲贝性腺发育，提高了幼虫生长率。亲贝性腺指数平均日增长达２％以上，幼虫日平均增长１３．８５μｍ，同时，光合细菌可降低  相似文献