西峡盆地新类型恐龙蛋化石的发现   总被引：1，自引：0，他引：1  

王德有  周世全 《河南国土资源》1995,(4)

本文首次报道广西峡盆地的两类新类型的恐龙蛋化石：西峡长圆柱蛋（新属、新种）Ｌｏｎ－ｇｉｔｅｒｅｓｏｏｌｉｔｈｕｓｘｉｘｉａｅｎｓｉｓ（ｇｅｎ．ｅｔｓｐ．ｎｏｖ．）．戈壁棱柱形蛋ＰｒｉｓｍａｔｏｏｌｉｔｈｕｓｇｅｂｉｅｎｓｉｓＺｈａｏａｎｄＬｉ１９９３。它们分别产于高沟组的中、下部和上部，其时代均为晚白垩世。  相似文献   

Occurrence of organochlorine pollutants in the eggs and dropping-amended soil of Antarctic large animals and its ecological significance     

Vetter WALTER 《中国科学D辑(英文版)》2007,50(7):1086-1096

Persistent organochlorine pollutants (POPs) are analyzed for the dropping-amended soils from the habitats of Antarctic seabirds and seals in Fildes Peninsula and Ardley Island. The concentration ranges are 0.21 to 3.85 ng/g for polychlorinated biphenyls (ΣPCBs),0.09 to 2.01 ng/g for organochlorine pesticides (ΣDDT),and 0.06 to 0.76 ng/g for hexachlorocyclohexanes (HCHs). Among these,hepata-chlorobiphenyls,hexachlorobiphenyls,p,p′-DDE and α-HCH compounds are dominant. The concentra-tion ranges of ΣPCB,DDT and HCH in the eggs of skuas were 91.9―515.5 ng/g,56.6―304.4 ng/g and 0.5―2.0 ng/g respectively; those in the eggs of penguins were 0.4―0.9 ng/g,2.4―10.3 ng/g and 0.1― 0.4 ng/g; and those in the eggs of giant petrel were 38.1―81.7 ng/g,12.7―53.7 ng/g and 0.5―1.5 ng/g respectively. The dominant POP compounds in the eggs are PCB180,PCB153,p,p′-DDE and hexa-chlorobenzene (HCB). The present study shows that the concentration of POPs in the sea-bird-inhabited-dropping-amended soil varies with the extent of predation and nest occupancy of dif-ferent seabird populations. Statistical analysis on the POP concentrations from the different seabird eggs implies that the difference in the bio-concentration levels of the birds depends on the bio-habits of the species,such as the range of activity,distance of immigration,feeding pattern,and nest occupation. Among these,the most important factor is the location of the seabirds in the food chain and their feeding pattern. This shows that POPs accumulated in the seabirds resulted from the bio-concentration through the food chain. In addtion,210Pb dating for the dropping-amended soils (AD1-a and AD2) was performed,which provided the POP accumulation rate and the historic record for the soil profile. It indicates that POP will continuously affect the Antarctic ecosystem for a long time.  相似文献   

浙江天台盆地蛋化石与恐龙的绝灭   总被引：9，自引：1，他引：9  

方晓思卢立伍  蒋严根杨良锋 《地质通报》2003,22(7):512-520

综合报道了浙江天台盆地产出的蛋化石，其中包括新建立的龟鳖化石蛋科(新科)Tesmdoolithidae ram. nov.和天台蛋属(新属)Tiantaioolithus gen. nov.,以及5个新种：Dendroolithus shuangtangensis sp. nov.,Elongatoolithus chichengshanensis sp. nov,Elongatoolithus laijiaensis sp. nov,Spheroolithus jincunensis sp. nov,Tiantaioolithus jiangi sp. nov。这批蛋化石以赤城山组出现的类型最为丰富，有长形蛋、树枝蛋、圆形蛋、龟鳖类化石蛋等；赖家组蛋化石数量少，仅见长形蛋和圆形蛋类，其时代均为晚白垩世。推测天台蛋化石消失的原因是由于气候变冷，受精卵不能正常孵化所致。孵化率降低，生殖链打断，可能是引起恐龙绝灭的原因之一。  相似文献   

南京地区蛋鸡生产热应激影响的特征分析   总被引：1，自引：0，他引：1  

闵庆文  赵军 《南京气象学院学报》1994,17(4):503-507

针对南京地区夏季高温高湿的气候特征，分别分析了温度、湿度及温湿综合因子（温湿指数）对蛋鸡生产的影响，确定了该地区热应激发生的时间及强度特征。结果表明：该地区热应激发生于６、７、８月，严重热应激主要集中在７月中旬￣８月上旬，尤其在７月下旬。  相似文献   

西峡晚白垩世恐龙蛋化石宏观矿物组成研究及意义   总被引：7，自引：0，他引：7  

李艳芳  蔡厚安  梁汉东  张俊  梅亚青  张宏刚 《吉林大学学报(地球科学版)》2006,36(2):158-163,168

发现于河南省西峡盆地的恐龙蛋化石群产于白垩纪末期的典型红色粘土地层,因此该化石本身可能包含着当时地史时期全球或区域环境灾变记录。利用显微镜观察恐龙蛋的表观特征;利用XRD和XRF研究发现蛋内外粘土的成分极其相似,进而推断西峡恐龙蛋化石蛋腔内的物质源于蛋腔外部;通过扫描电镜/能谱分析发现蛋壳表面存在裂纹现象,同时在蛋体内发现了针铁矿、铜锌氧化物、硫酸钡、氧化硅等颗粒,并对其形成和来源给出了适当的解释。并基于实验结果对K/E转折时期的环境灾变机理进行了初步探讨。  相似文献   

The Korean Folk Custom Forbidding The Establishment of Water Wells          下载免费PDF全文

Hong‐Key Yoon 《Geographical review》2016,106(1):136-154

For over a thousand years many settlements in Korea forbid the digging of water‐wells. This custom can be explained using geomancy, which personifies local landscapes or names them after animate or inanimate objects. In ‘sailing boat’ landscapes the digging of water‐wells was prohibited because this was viewed as analogous to making a hole in the bottom of a boat, which would thus bring misfortune to local residents. Based on this geomantic reasoning, people considered the custom of forbidding well digging to be an integral part of the art of geomancy, with its origin in a geomantic belief system. My earlier research sustained this explanation but this paper, which is based on two recent instances of field work, rejects the established view on the custom. The aim of this paper is to critically re‐examine this established view and suggests a new idea that the folk custom of prohibiting well digging in Korea was not originally derived from geomancy, but was conceived from a non‐geomantic indigenous Korean idea and have become linked to geomancy through the enforcement process of practicing the custom in traditional Korean society.  相似文献   

三角褐指藻和亚心形扁藻对太平洋纺锤水蚤繁殖与生化指标的影响   总被引：1，自引：0，他引：1  

郑颖  王桂忠  艾春香 《台湾海峡》2012,31(2):210-217

采用实验生态的方法,探讨三角褐指藻(Phaeodactylum tricornutum)、亚心形扁藻(Platymonassubcordiformis)对太平洋纺锤水蚤(Acartia pacifica)繁殖及其生化指标的影响.实验结果表明,三角褐指藻对太平洋纺锤水蚤产卵量和卵的孵化率均具有抑制作用,随着投喂时间的增加,太平洋纺锤水蚤的产卵量由15.02±3.15 ind/d下降到3.25±3.15 ind/d(p<0.05),其卵的孵化率由22.88%±2.49%下降到14.84%±1.20%(p<0.05).而投喂亚心形扁藻的太平洋纺锤水蚤其产卵量和卵的孵化率与对照组无显著差异(p>0.05).投喂三角褐指藻后,太平洋纺锤水蚤的超氧化物歧化酶(SOD)活力相对于投喂亚心形扁藻的增加了20.94±0.04μg/mg,其谷胱甘肽过氧化物酶(GPX)活力增加了15.812±1.240 U/mg.这表明相对于亚心形扁藻,三角褐指藻对太平洋纺锤水蚤的抗氧化性酶具有诱导作用.  相似文献   

南极Amanda湾帝企鹅卵的生态生物学及与其它南极海鸟卵的比较          下载免费PDF全文

王自磐  熊尚陵  Ian Norman 《极地研究》2008,20(4):320-328

对南极Amanda湾帝企鹅的卵进行了生态生物学观测与相应的统计分析。结果显示,帝企鹅卵为典型的卵形卵,平均长、短径分别为121.3mm和83.8mm;平均卵容量409.3ml(322.6-506.4ml),卵的平均壳厚为1.11mm(0.94-1.23mm)。帝企鹅和南方巨鹱、白眉企鹅以及灰贼鸥等南极海鸟的卵相比较,卵的形态大小与容量成正比,同时,容量较大的卵具有较厚的卵壳,以增强对卵的保护。这些海鸟卵的生态生物学特征,包括保护色的有无、卵容量的大小,以及卵壳厚度等特征参数,是这些海鸟种的明显特征,并与亲鸟在繁殖期的窝卵数以及孵化习性相协调,以达到对南极环境的适应与生存。  相似文献   

黑鲷（Sparus macrocephalus）成熟精,卵和精子入卵早期过程的初步观察   总被引：13，自引：0，他引：13  

张筱兰  丛娇日 《海洋湖沼通报》1998,(4):62-68

黑鲷精子入卵早期发育迅速。精、卵相遇的3－5sec左右,卵孔管出现一种能引诱精子入卵的物质;精卵相触约10－15sec左右,即精子进入卵孔管后,管内又涌出另一种能阻止多余精子继续入卵的物质;同时,受精锥形成。约15-54sec左右,受精膜发生;约90sec左右受精膜举起,围卵腔雏成;约180sec左右受精锥开始退缩,精子头部和颈部被俘入卵内;约300sec左右出现第二极体。文中对卵孔管出现的这两种物质进行了浅析。  相似文献   

Design of A Bionic Spudcan and Analysis of Penetration and Extraction Performances for Jack-up Platform     

GUO Sheng  ZHUANG Hong  TANG Wen-xian  WU Wen-le  LIU Qin  WANG Yue-yang 《中国海洋工程》2020,(1):80-88

The mechanisms of soil structure interaction have drawn much attention in the past years in the installation and operation of jack-up platform. A bionic spudcan produced by biomimetic of egg and snail shell is proposed, and the performance of the penetration and extraction are analyzed by numerical method. The geometric contour of egg and snail shell is measured, and its mathematical model is established respectively. According to the structure of existing spudcan of jack-up platform, three kinds of typical biomimetic spudcan are designed. Furthermore, numerical analysis models of biomimetic spudcan are established respectively to study the soil structure interaction mechanism in the process of penetration and extraction, and contrastive analysis of resistance characteristics are carried out. To conclude, the results show that the biomimetic spudcan facilitates the platform installation, and it is also beneficial to the improvement of the bearing capacity of spudcan.  相似文献