Research of role, biodiversity, and material metabolism in oligotrophic lakes

寡营养湖泊的作用、生物多样性和物质代谢研究

• 批准号: 09680500
• 负责人: HINO Shuji
• 金额: $ 1.86万
• 依托单位: YAMAGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680500/
• 关键词: oligotrophic lake; biodiversity; material metabolism; phytoplankton; primary production; ピコプランクトン; 細菌類; 細菌

Lake Akan-Panke is in oligotrophic level, and small sized phytoplankton (<2μm) produced organic matter dominated in stratified period. In contrast, large sized phytoplankton (>20μm, mainly diatoms) dominated in circulation period. In May, phytoplankton distributed in deep layer (before formation of thermocline) derived from large sized phytoplankton (mainly diatoms) grown in surface layer (or near). Those sank slowly to the bottom, and maintained 20% of photosynthetic activity as compared to the activity of phytoplankton in the surface layer. Primary production in this lake was maintained by picophytoplankton except for May and November in circulation period.Acid and oligotrophic Lake Inawashiro was so low level for biomass of phytoplankton as compared to Oligotrophic Lake Akan-Panke. Although nutrient concentration was so low level, this lake was lack in COィイD22ィエD2 needed for photosynthesis of phytoplankton (<0.5 mgC/l). In addition, population number of bacteria decomposed organic m … More atter was also low (<5X10ィイD15ィエD1 cells/l) as compared to neutral oligotrophic lake. These facts mean that metabolism of organic matter in this lake is so different to general type of lake. Biodiversity of this lake is also markedly different to general lakes. The limiting factor in acid lake for primary production, origin of organic matter in lake, and its decomposer must be made clear in near future.Eutrophic Lake Barato was researched to compared the variation in biodiversity and selection of dominant phytoplankton species in oligotrophic lake, and this lake dominated Aphanizomenon flos-aqae, Anabaena sp. And Microcystis aeruginosa (Cyanophyce). Although these species selected from May to July raised water temperature, the selection could not be proved the reason. In this lake, nutrient concentration, excepcially change of orthophosphate concentration, was so important with water temperature. Change of biodiversity in Lake Barato at least concerned cell population dominant diatom besides raise of water temperature and orthophosphate concentration. Less

Akan-Panke湖处于贫营养状态，分层阶段以小型浮游植物（<2μm）产生的有机质为主。环流期以大型浮游植物（>20μm，主要为硅藻）为主。5月份，在温跃层形成之前，分布于深层的浮游植物是由生长在表层（或近表层）的大型浮游植物（主要是硅藻）演变而来的。这些浮游植物缓慢地沉到底部，并保持20%的光合作用活性相比，在表层的浮游植物的活动。除环流期的5月和11月外，该湖的初级生产力均由微微型浮游植物维持。与贫营养的阿寒盘池相比，酸性贫营养的稻苗代湖浮游植物生物量水平较低。虽然营养盐浓度很低，但该湖缺乏浮游植物光合作用所需的CO_（22）O_（2此外，分解有机质的细菌种群数量也随土壤pH值的增加而增加， ...更多信息 与中性贫营养湖泊相比，atter也较低（<5 × 10 - 6D 15个D1细胞/l）。这些事实意味着该湖泊中有机质的代谢与一般类型的湖泊有很大的不同。该湖的生物多样性也明显不同于一般湖泊。以Barato湖为研究对象，以水华束丝藻（Aphanizomenon flos-aqae）、鱼腥藻（Anabaena sp.）和铜绿微囊藻（Microcystis aeruginosa）为优势种，比较了富营养化湖泊浮游植物多样性的变化和优势种的选择。5 ~ 7月选择的品种虽能提高水温，但不能证明其原因。除正磷酸盐浓度外，营养盐浓度对水温的变化也有重要影响。巴拉托湖生物多样性的变化除了与水温和正磷酸盐浓度的升高有关外，至少还与细胞数量优势硅藻有关。少

项目成果

Kotaro Sugawara: "Physicohemical and biological characteristics of Lake Bishamon-numa in Urabandai Fukushina Prefecture"Japanese Journal of Limnology. 60:(3). 367-377 (1999)

菅原光太郎：“里磐梯福科县毗沙门沼的物理化学和生物学特征”日本湖沼学杂志。

Shuji Hino: "Limnological Characteristics and Vertical Distribution of phytoplankton in Oligotrophic Lake Akan-Panke" The Japanese Journal of Limnology. 59(3). 263-279 (1998)

Shuji Hino：“寡营养阿寒湖-Panke 的湖泊学特征和浮游植物的垂直分布”日本湖泊学杂志。

Kotaro Sugawara: "Physicochemical and biological Characteristics of Lake Bishamon-numa in Urabandai Fukushima Prefecture"Japanese Journal of Limnology. 60. 367-377 (1999)

菅原光太郎：“福岛县内磐台毗沙门沼的物理化学和生物学特征”日本湖沼学杂志。

Shuji Hino: "Limnological characteristics and vertical distribution of phytoplankton in oligotrophic Lake Akan-Panke"Japanese Journal of Limnology. 59 : (3). 263-279 (1998)

Shuji Hino：“寡营养阿寒湖-Panke湖沼学特征和浮游植物的垂直分布”日本湖泊学杂志。

Keishi Takano: "Effect of temuperature and soluble reactive phosphorus on abundance of Aphanizomenon flos-aquae (Cyanophy Ceae)"Phycological Researoh. (発表予定).

Keishi Takano：“温度和可溶性活性磷对水花束丝藻（Cyanophy Ceae）丰度的影响”藻类研究（待提交）。