Phytoplankton community characteristics in the coastal waters of the southeastern Arabian Sea     

MINU P.  SHAJU S. S  MUHAMED ASHRAF P.  MEENAKUMARI B. 《海洋学报(英文版)》2014,33(12):170-179

Remote sensing applications are important in the fisheries sector and efforts were on to improve the predictions of potential fishing zones using ocean color. The present study was aimed to investigate the phytoplankton dynamics and their absorption properties in the coastal waters of the southeastern Arabian Sea in different seasons during the year 2010 to 2011. The region exhibited 73 genera of phytoplankton from 19 orders and 41 families. The numerical abundance of phytoplankton varied from 14.235×103 to 55.075×106 cells/L. Centric diatoms dominated in the region and the largest family identified was Thalassiosiraceae with main genera as Skeletonema spp., Planktionella spp. and Thalassiosira spp. Annual variations in abundance of phytoplankton showed a typical one-peak cycle, with the highest recorded during premonsoon season and the lowest during monsoon season. The species diversity index of phytoplankton exhibited low diversity during monsoon season. Phytoplankton with pigments Chlorophyll a, Chlorophyll b, Chlorophyll c, peridinin, diadinoxanthin, fucoxanthin, β-carotene and phycoerythrobilin dominated in these waters. The knowledge on phytoplankton dynamics in coastal waters of the southeastern Arabian Sea forms a key parameter in bio-optical models of pigments and productivity and for the interpretation of remotely sensed ocean color data.  相似文献   

中国著名的优质水稻之一     

孙治贵  徐文迪 《气象知识》2014,(2):36-36

“宇宙无常,沧海桑田。造化填海,隆起津南”（《津南气象赋》）。津南区位于天津市东南部,海河下游右岸,是经过漫长的“沧海桑田”变化,海退成陆形成的,总面积385．71平方千米,属于渤海海积和黄河冲击平原,地势甲坦、上层较厚,其地表层多为黄土、黑沙土两种,土质略含盐碱。  相似文献   

耕地保护守“红线” 土地整治提“地力” 周口粮食年产量喜创全省第一     

袁可林  李殿彬 《河南国土资源》2014,(5)

正日前,记者从河南省有关部门获悉,周口市2013年粮食总产量达到79.4亿公斤,较2009年增加了7.75亿公斤,连年稳居全省18个省辖市的第一名,大步跨进全国粮食生产先进市行列。与此同时,该市的郸城、太康等8县(市),也一同进入"全国粮食生产先进县"行列。业内人士认为,这一喜人成果是与周口市重视耕地保护和土地整治取得的显著成绩分不开的。周口市位于河南省东南部,国土面积1.19万平方公里,总人口1086万,人均耕地1.15亩。近年来,该市市委市政府面对工业化、城镇化发展带来的刚性用地需求,在  相似文献   

玛雅文明与气候变化     

汤家礼 《海洋世界》2012,(3):1-1

早在3000年前，玛雅人就生活在墨西哥东南部、危地马拉、洪都拉斯、萨尔瓦多和伯利兹等中南美洲区域，并在那里创造出举世闻名的玛雅文明。玛雅人的家园地处犹加敦半岛，这座半岛主要由珊瑚和多孔石灰岩构成，  相似文献   

争光岩岩金矿成矿因素剖析     

张春新  肖尧  王磊 《黑龙江国土资源》2010,(2):50-51

矿区位于大兴安岭地槽褶皱,系罕达气优地槽褶皱带罕达气褶断束的中西部,三矿沟——多宝山——铜山——争光北西向早期深断裂及其铜金多金属成矿带东南部。  相似文献   

壳内岩浆层演化的盆地效应:以中国东南部中生代盆地为例   总被引：2，自引：2，他引：0       下载免费PDF全文

王晶  陈国能  Rodney Grapes  邱燕 《地学前缘》2011,18(1):24-31

中国东南部中生代发育有拗陷型、断裂型、断陷型3种不同类型的盆地,其中前者发育于晚三叠世-早侏罗世,其内多为含煤建造;次者发育于中侏罗世-早白垩世,主要为火山岩建造;后者发育于白垩纪-古近纪,主要为陆相红岩建造。研究结果表明,盆地构造类型的演化与该区中生代壳内岩浆层的演化密切相关。与联合古陆解体相伴随的古太平洋板块俯冲使得东亚陆缘岩石圈的内能逐渐升高,其结果是壳内岩浆层的形成和增厚以及其上盖层岩石的弯曲变形,导致中生代早期众多拗陷盆地的形成;燕山早期的构造运动使印支期已强烈变形的地壳进一步破裂,为壳内岩浆层的物质溢出或喷发提供了通道条件,从而在重熔界面(岩浆层上界面)埋深较浅的本区东部形成众多火山岩盆地;系统内能在晚侏罗世后逐渐下降,地壳冷却收缩使得断块的重力调整逐渐占主导位置,形成众多由正断层控制的断陷盆地。  相似文献   

林芝：雪域高原上的绿色明珠     

孟路 《资源导刊(河南)》2013,(10):60-61

家乡林芝位于西藏自洽区东南部,其西部和西南部分别与拉萨、山南两地相连,”东部和北部分别与昌都地区、那曲地区相连,南部与印度、缅甸两国接壤,  相似文献   

湘湖     

《浙江国土资源》2012,(6)

浙江湘湖旅游度假区是一个以历史文化、自然生态、休闲度假为主题的开放型旅游风景区,她位于杭州市东南部,距西湖15公里,与西湖隔钱塘江而南北相望。  相似文献   

青海东南部应力场特征及正断层小震现象的初步研究          下载免费PDF全文

马辉青  姚家骏  马建新  李玮杰  袁伏全 《地震工程学报》2014,36(2):372-379

利用2008-2013年青海东南部数字地震波资料,采用Pg、Sg最大振幅比及CAP方法反演得到92个ML2.5～4.9中小地震震源机制解。统计结果表明该区中小地震震源类型以走滑为主,应力轴接近水平,兼有一定量正断层类型,逆冲类型较少;利用格点尝试法求出研究区平均现代构造应力场是以处于近NE—SW方向的水平压应力和近NW—SE方向的水平张应力为特征;进一步分析了研究区正断层小震产生的背景,初步认为这些正断层类型小震可能主要源自高海拔地形产生的重力滑塌作用。  相似文献   

AN ANALYSIS OF THE WINTER EXTREME PRECIPITATION EVENTS ON THE BACKGROUND OF CLIMATE WARMING IN SOUTHERN CHINA   总被引：2，自引：1，他引：1  

智协飞  张玲  潘嘉璐 《热带气象学报(英文版)》2010,16(4):325-332

Based on daily precipitation and monthly temperature data in southern China, the winter extreme precipitation changes in southern China have been investigated by using the Mann-Kendall test and the return values of Generalized Pareto Distribution. The results show that a winter climate catastrophe in southern China occurred around 1991, and the intensity of winter extreme precipitation was strengthened after climate warming. The anomalous circulation characteristics before and after the climate warming was further analyzed by using the U.S. National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis data. It is found that the tropical winter monsoon over East Asia is negatively correlated with the precipitation in southeastern China. After climate warming the meridionality of the circulations in middle and high latitudes increases, which is favorable for the southward movement of the cold air from the north. In addition, the increase of the temperature over southern China may lead to the decrease of the differential heating between the continent and the ocean. Consequently, the tropical winter monsoon over East Asia is weakened, which is favorable for the transport of the warm and humid air to southeastern China and the formation of the anomalous convergence of the moisture flux, resulting in large precipitation over southeastern China. As a result, the interaction between the anomalous circulations in the middle and high latitudes and lower latitudes after the climate warming plays a major role in the increase of the winter precipitation intensity over southeastern China.  相似文献