The system of biological production and ecological change in the huge lake promoted by the process of material loading and circulation of Lake Baikal

通过2002年至2005年4年的研究，我们取得了以下科学成果。在巴尔古津湾和利斯特维扬卡近海地区考察了沉降通量的组成和季节变化。从冰封期到解冻期，活跃的生物生产使湖泊的通量显著增加.研究了尿素的生物地球化学动力学。夏季尿素在地表水中的停留时间为3-6天，而冬季则很长，为560天。研究了微型浮游植物的水平和垂直分布、营养状态、生产限制因子。巴古津湾近岸海域浮游生物丰度增加，但未受磷限制.研究了浮游植物初级生产力的营养盐限制。在贝加尔湖的南部和中央湖，第一限制营养素被认为是磷，而不是氮在夏季。用傅立叶变换对溶解有机质进行表征， 关于我们 m离子回旋共振质谱。Alloctonus腐殖物质被阐明为被带到近海地区而不变性。该地区产生了有机硫化合物等自生有机物.研究了水生植物对磷的吸收和积累机制。贝加尔湖和琵琶湖伊乐藻和伊革藻的作用机制无显著差异.对海盆南部沿岸的带附着藻类群落的现存量和光合生产进行了研究。高生物量记录，特别是在Ullothrix和Drapanaldiopsis占主导地位的社区。生长在海岸浅水区岩石上的藻席具有很高的总光合速率。研究了巴尔古津湾细菌、浮游植物和原生生物的垂直和水平丰度。在近海，叶绿素a的浓度和滤食或捕食纤毛虫的密度之间存在显着的相关性。对巴古津湾微微型浮游植物的丰度、生长和摄食损失率进行了调查。微微型浮游植物的丰度、组成和在微生物食物网中的生态作用在近岸和离岸区域之间存在差异。2004年6 ~ 10月进行了水温长期监测。夏季，盆地中部和南部西岸近地层温度同时下降，但相差10℃。深湖水上涌可能发生。少

We have got the following scientific results by our research for 4 years from 2002 to 2005.1. Composition and seasonal change of settling flux were examined in Barguzin Bay and off-shore area of Listvyanka. Significant increase of the flux by active biological production was observed from ice-covered to thawing periods of the lake.2. Bio-geochemical dynamics of urea was studied. Residence time of urea in the surface water was 3-6 days in summer, but was very long and 560 days in winter.3. Horizontal and vertical distributions, trophic state, production limiting factor of picophytoplankton was examined. Abundance of the plankton increased in off-shore area of Barguzin Bay, but was not under phosphorus limitation.4. Nutrient limitation in the primary production of phytoplankton was studied. In the southern and central Lake Baikal, the first limiting nutrient was thought to be phosphorus rather than nitrogen during summer.5. Dissolved organic matter was characterized with Fourier transfor … More m ion cyclotron resonance mass spectrometry. Alloctonus humic substances were elucidated to be brought to off-shore areas without denaturalization. Autochtonus organic matter, such as organic sulfur compounds, were produced in the area.6. Phosphate uptake and accumulation mechanisms of water plant were studied. Significant difference was not shown between their mechanisms of Elodea and Egeria in Lakes Baikal and Biwa.7. Standing crop and photosynthetic production of attached algal communities were studied at the littoral zone of the southern basin. High biomass were recorded especially in Ullothrix and Drapanaldiopsis dominated communities. The algal mat of Ullothrix developed on rocks on shallow near shore sites showed very high rate of gross photosynthesis.8. Vertical and horizontal abundance of bacteria, phytoplankton and protists were examined in Barguzin Bay. In off-shore, significant correlations were detected between concentrations of chlorophyll a and density of a filter feeding or raptorial ciliates.9. The abundance, growth and grazing loss rates of picophytoplankton were investigated in Barguzin Bay. There was a difference in the abundance, composition and ecological role in the microbial food web of picophytoplankton between the near-shore and the off-shore areas.10. Long time survey of water temperature was performed from June to October in 2004. Temperature decrease with 10℃ difference was observed at the same time in the surface layers on the western coasts of the central and southern basins in summer. Up-welling of deep lake water was suggested to occur. Less