小型底栖生物取样方法的研究

1984年4月在秦皇岛新煤码头砂质中潮带,用内径分别为1.8,2.2和3.4厘米的有机玻璃管各随机取样5次,芯样长28cm,所得海洋线虫密度(个/10厘米~2)分别为1497-2200,1262-1704和1162-1715单因子方差分析的结果表明,这三种内径的取样管所得海洋线虫计数的平均数之间没有显著的差异(F相似文献   

EFFECTS OF CO—CULTURE AND SALINITY ON THE GROWTH AND AGAR YIELD OF GRACILARIA TENUISTIPITATA VAR LIUI ZHANG ET XIA

Gracilaria tenuistipitata var Liui were mono-cultivated and co-cultivated with Pinctada martensii under high(33) and low(21) salinity conditions in laboratory.The daily growth rate of the alga was determined.Tissue carbon and nitrogen contents,the yield and fractional composition of agar were analyzed.Results showed that:1.Gracilaria grew better under low salinity conditions,the daily growth rate was twice that under high salinity conditions.Co-cultivated algae grew faster than mono-culti-vated algae under low salinity conditions,the daily growth rate was about 37.6?higher.2.Compared with mono-cultivated algae,tissue nitrogen contents of co-cultivated algae were higher,while the C:N ratios were much lower.3.The agar yields of co-cultivated algae were much lower than those of mono-culti-vated algae.Agar yield was found to be negatively correlated to the tissue nitrogen contents,and positively correlated to the C:N ratios.4.The highest fractional yields obtained from co-cultivated algae were extracted with 40?ethanol,while from mono-cultivated algae,the highest fractional yields obtained were extracted with distilled water at room temperature.     

PHYLOGENETIC RELATIONSHIPS AMONG PUFFERFISH OF GENUS TAKIFUGU BY RAPD ANALYSIS

AmpLifications with 300 10-base primers under predetermined optimal reaction yielded 2762 reproducible amplified fragments ranging from 200 to 3000 bp. Genetic distances among five species of Takifugu and Lagocephalus spadiceus as outgreup were calculated based on the presence/absence of the amplified fragments. Topological phylogenie trees of the 5 species of Takgfugu and the outgroup were gen-erated by Parsimony and Neighbor-Joining analysis based on RAPD data set. The genetic distance between T. rubripes and T. pseudommus was almost the same as that between individuals within each species, but was much smaller than that among T. rubripes, T. pseudommus and the other species. The molecu-lar data from RAPD analysis convincingly showed that T. rubripes and T. pseudommus should be the same species.     

锆石晶形统计在花岗岩体研究中的应用

锆石晶形的变化主要决定于产出母岩的岩石化学特征,尤其赴SiO_2、K_2O、Na_2O、CaO、Al_2O_3等主要组分的相互比例关系。在一定区域范围内,花岗岩类岩石的岩石化学成分的演化发展,在时间上有一定的变化规律,用晶形统计方法能定量地反映锆石的晶形特征及其变化趋势,有助于对花岗岩体的对比和岩石研究。     

夏季100毫巴青藏高压与我国东部旱涝关系的天气气候研究

通过分析13年资料后,指出夏季100毫巴青藏高压脊线及高压中心的位置与我国东部大范围旱涝分布的关系密切。 1.夏季100毫巴青藏高压脊线的位置,尤其是120°E处脊线位置,与长江中、下游梅雨期及伏旱期有密切的关系,梅雨期120°E脊线位于26°—32°N之间,伏旱期在33°N以北。 2.夏季100毫巴青藏高压中心经常出现在高原上空,这可能与高原夏季加热作用有关。100毫巴青藏高压中心、脊线位置及90°—120°E脊线的走向与我国东部地区旱涝有较密切的关系。 3.把100毫巴青藏高压的活动划分成东部型、带状型及西部型三类天气过程。在东部型和带状型过程中,长江中、下游、川东及贵州少雨(旱),而川西及华北多雨(涝);相反在西部型过程中,长江中、下游、川东及贵州多雨(涝);而川西少雨(旱),华北多雨(涝)。     

磨拉石建造岩石中钍-铀比研究结果及其对阐明水成矿床铀源的意义

铀和钍在外生作用中的行为特征,从原则上提供了应用的放射性地球化学资料以划分和对比沉积岩,阐明其中铀矿床的铀源的可能性,从而可以判定矿床的成因。为了揭示成矿物质的来源,若干年来对赋存在下白垩系的陆源沉积侵蚀构造盆地中的铀矿床的岩石化学和放射性地球化学特征进行了研究。这些陆相山麓扇带的磨拉石建造为多相     

江苏矿产地质工作程度

江苏矿产地质工作研究历史悠久，研究程度较高。对江苏以往矿产地质工作作较全面的回顾，对今后进一步开展地质矿产工作及矿产的综合开发利用具有重要意义。     

固体地球科学与全球变化研究

固体地球科学要积极参与全球变化的研究。全球增暖的温室气体ＣＯ２增率与大气升温呈正相关性。第四纪的最末１．５Ｍａ间有１７次冰期，其成因可能与米兰科维奇周期律有关。除现今估算的人类每年燃料排放的ＣＯ２量外，地球内部由火山和地震等的大地构造原因释放的ＣＯ２量需定量估算，甚至可能是大气ＣＯ２增率的主要来源。我国文化历史悠久，对历史中的盛世与气候变迁关系应深入研究。我国的自然条件复杂而独特，应研究其变化特色     

地震电磁关系模拟实验室“八五”技术改造

由国家地震局地球物理研究所承担的“震磁电模拟实验系统技术改造”课题，对震磁电关系模拟实验室进行了实验系统的改造。该文简要地介绍了该课题所完成的主要工作，包括：电阻率ＣＴ仪，电磁实验用十通道智能仪表放大器，磁天平及非磁滞乘磁系统。