北方鱼塘浮游生物的生态研究

作者通过现场测定和室内实验相结合的方法,探讨了浮游生物量与温度、施肥、溶解氧含量等生态因子的相互关系,采用生物统计的方法总结了如何提高及稳定浮游生物产量的几项措施。     

Plankton from Early Cambrian black shale series on the Yangtze Platform, and its influences on lithologies

Blackshalesandcherts ,containingnodularphosphoritesandorelayers[1] arecommonintheEar lyCambriandeeperwaterfaciesoftheYangtzePlat form[2 ] andoffera goodchanceformicropaleonto logicalresearchusingtechniquesofchemicaldissolu tion ,peelingandsectioning .Wetriedtoseparateandinvestigateoceanicplanktoncommunitiesfrombitu minous,“deeperwater”chert ,blackshale andphosphoritelithologies ,andtodocumenttheirpreser vationandinfluencesonthecompositionofthesedi ments .Thepresentpaperaimsatgivingareportof…     

Distribution,ecology, and oxygen and carbon isotope characteristics of modern planktonic foraminifers in the Makarov Basin of the Arctic Ocean

The Arctic region, with magnificent ice cover on the surface of the Arctic Ocean and adjacent seas, is not only extremely sensitive to but also has strong amplification effects on climate change. Observations during the past decades have documented substantial retreat and thinning of the Arctic sea-ice cover, a process that is accelerating. Its feedback and impact on the global climate has become an important subject of current climate change research. Calcite tests of planktonic foraminifers are major constituents in pelagic sediments, and they provide valuable materials for the reconstruction of past oceanographic conditions. However, research is still sparse in the Arctic sea area because of limited availability of the materials for investigation. Here, we present a study of modern foraminifers from the plankton tow samples taken in the Makarov Basin of the Arctic Ocean during the fourth Arctic expedition of China. We have analyzed ecological information stored in the modern planktonic foraminifers and in their stable isotope signals, and established a relationship between the distribution of the main taxa and the environment. Our main observations are as follows:(1) in the Makarov Basin, the polar species Neogloboquadrina pachyderma(sinistral coiling) dominates the [150 lm planktonic foraminiferal assemblages.(2) The planktonic foraminifers live mainly in the upper halocline at a water depth of 50–100 m and less in the depth interval of 100–200 m.(3) Temperature change in the halocline can affect the absolute abundance of planktonic foraminifers and their distribution in the water column. The warmer halocline is more favorable to the development of planktonic foraminifers.(4) A lighter d18O value(2.11 %) of N. pachyderma(sin.) is recorded in the depth interval of 100–200 m, which is likely related to the isotopically light brines separated out during sea ice freezing. The relatively heavy d18O value(1.68 %–2.68 %, average 2.27 %) in the depth interval of 50–100 m may be influenced by the low salinity water with the relatively heavy d18O value formed during the sea-ice melting in the surface layer.     

运城盐池浮游硅藻的研究

1992年3月在运城盐池4个样点采浮游硅藻,该水体盐度为58.18‰～279.18‰,共见到浮游硅藻82个分类单位,其中相对丰度为8％以上的有14个分类单位。这些种类的盐谱均较文献记载的为高。运城菱形藻为本次调查中发现的一新种,将另文发表。     

盐碱地池塘夏花鱼苗培育的研究

盐碱地池塘用“三合二”清塘,拖用有机肥和酸性化肥调整池水PH值,培育浮游生物后,投放水花鱼苗来培育夏花鱼苗的生产效果较好。     

人工施肥对珊珀湖浮游生物种群及数量影响研究

比较研究18年来珊珀湖在人工施肥投饵条件下的浮游生物及氮、磷变化,结果表明:2003年6-10月浮游植物生物量各采样点平均值为4.903 73×107L-1,最高峰出现在7月和9月两个月,优势种群为蓝藻门、绿藻门,全年藻量各门生物量所占百分比为:蓝藻门85.2%,绿藻门8.37%,黄藻门1.07%,硅藻门2.66%,甲藻门0.03%,裸藻门0.16%,隐藻门2.54%,金藻门0.19%;浮游动物生物量各采样点平均值为1.312 088×104L-1,最高峰出现在7月和9月,优势种群为原生动物和轮虫,其中原生动物18.09%,轮虫动物77.39%,桡足类3.43%,枝角类1.08%.与1986年相比,浮游生物增加了近10倍.同时,优势种群结构发生改变,氮、磷含量随人工投入量发生明显变化.