Material dynamics and ecological change in extra long water system, Hovosgol-Baikal-Yenisei area

我们在Hovosgol-Baikal-Yenisey水系的上半部分(长5500公里)从蒙古的Hovosgol湖到俄罗斯的Ust-Ilimsk湖进行了湖沼学实地考察。因此，在2006年至2008年期间，在资助科学研究(KAKENHI)(科学研究(A)海外学术研究，18255001)的推动下，本项工作和以前的相同研究标题的研究几乎调查了整个水系统区域。阐述了水体中微生物的水质和生态系统是随着河流下沉和湖泊滞留而发生变化的。在这一水系的源头和流入一个大型人工湖的主要河流入海口附近，其趋势明显。

We conducted a limnological field survey in the upper half of Hovosgol - Baikal - Yenisey water system (length: 5500 km) from Lake Hovosgol (Mongolia) to Lake Ust-Ilimsk (Russia). Therefore, almost whole area of the water system was surveyed by the present work and the previous research with same research title during from 2006 to 2008 promoted with the Grants-in-Aid Scientific Research-KAKENHI (Scientific Research (A) Overseas Academic Research, 18255001). Water quality and ecological system of micro-organisms were elucidated to be changed with flowing down of water in rivers and water stagnation in lakes in the water system. Its tendency was markedly observed around the source of this water system and the mouth of the main river flowing into a large artificial lake.