从孢粉、藻类化石组合看长江三角洲第一硬质粘土层的成因及其古环境意义

文章通过对长江三角洲南翼7个钻孔样品的孢粉、藻类分析,从晚第四纪第一硬质粘土层中提取出了种类和数量均较可观的孢粉、藻类化石,从而可以判别第一硬质粘土层形成时的沉积环境和植被类型,为长江三角洲地区硬质粘土层的成因研究提供了生物化石依据。研究结果表明,第一硬质粘土层中有多种孢粉、藻类化石组合。高含量淡水藻类的存在说明硬质粘土形成受到流水的作用,亦即硬粘土的形成环境可能为水域环境。化石组合中含量较低的海生沟鞭藻表明,长江三角洲地区在硬质粘土形成时曾受到海水影响。硬质粘土层中的禾本科-莎草科-落叶栎-松、禾本科-落叶栎-松-蒿和莎草科-落叶栎-香蒲孢粉组合指示研究区低地为平原区草甸,而周边的山地有针阔叶混交林分布,当时该地区属于温凉略湿的温带气候。     

A comprehensive factor model of growth velocity of green algae and diatoms in local lake area

With rapid development of our society and economy in these years, more and more nutrients flow into those water bodies, providing an excellent base for the various algal blooming breaking out very suddenly, only if environmental conditions are suitable. For water treatment plants using those eutrophication resources as raw water, the existing water quality models or eutrophication models cannot provide much in time and real-time help with a short-term to monitor a special local water area＇s quality of water source. In order to study the correlation between changes of several typical indices and growth regulation, algae were cultivated in an artificial environment. The raw water used in these experiments came from subsurface water at the Dashahe Reservoir in Guangdong Province, China. During the cultivating process, it strictly controlled original indices as trophic factors, ecological factors and topographic factors, and has successfully achieved 64 sets of experiment data, which indicate some suggested conclusions. It has achieved some regulations which can describe how certain factors influence algae growth biomass and velocity, including nutrition factors, ecological factors, and topographic factors. From several interrelated studies, it is known that algae growth velocity is affected mostly by initial trophic status, light intensity and water temperature. In this research, with the help of SPSS software to explore regression analyses, it is proposed that algae growth velocity model should be depicted as a comprehensive model and expressed as： dDdt = kent.     

碧口群的层序及时代

碧口群是一套发生在台地与裂谷之间的裂谷边缘型沉，各类岩石之间具有规律性的相变特征，按岩石类型及组合特征可划分为７个组级岩石地层单位。根据该群不整合在志留纪茂县群或水晶组之上，被中泥分统一石炭略阳组连续沉积覆盖，以及自身所产化石，将其时代确定为早一中泥盆世。     

南极附近水域微小型藻类的研究Ⅴ.长城站周转不同生境淡水藻类的分布

本文报道了长城周围西湖水、西湖泥沙、陆地雪等不同生境淡水藻类的种类组成，密度及分布、生态类群及相似性。分析结果表明，不同生境的种类组成和密度差异显著。陆地雪的藻类藻类大于西湖中的水、雪、泥沙。     

1991／1992年夏季南极普里兹湾邻近海域网采浮游植物的聚类分析

本文报道了１９９１／１９９２年南极夏季在普里兹湾邻近海域浮游植物调查的研究结果。经鉴定共有浮游植物３门２６属７８种；其平均细胞丰度为１２０±１７４×１０＾５个／ｍ＾３，密集区分布在６２°Ｓ，７８°－１０３°Ｅ，这一海域其细胞丰度在１１０×１０＾５－８６４×１－１０＾５个／ｍ＾３之间。     

峡东陡山沱组一些微化石的再研究

陡山沱期在生物进化中是一个重要的阶段，这一时期不仅在动物界而且在植物界均有明显的变化。峡东陡山沱组多种多样的微化石已有众多报道。这个生物群落包括浮游的球形体、底栖的藻丝体和瓶状微化石。最近笔者重新研究了陡山沱组薄片中的微化石，这些微生物三维地保存在几乎未蚀变的条件下，以丰富的具刺疑源类为特征，主要者有Baltisphaeridium，Filisphaeridium，Tianzhushania和Comaspheridium等。陡山沱组的碳酸盐岩相具刺疑源类和瓶状微化石与产自Spitsbergen的化石近似。这似乎说明陡山沱组与位于Spitsbergen东北部的Svanbergfjellet组沉积可以对比。但由于化石只发现在少数薄片中，因此上述结论可能是片面的，这些化石可能只代表峡东陡山沱组生态环境的一部分。