抚仙湖是中国云南省的一个深水湖,连接着富营养化的浅水湖--星云湖,星云湖排放含绿藻的水进入抚仙湖.两湖位于省会昆明附近,由于地方文化、集约化农业、以及旅游业的发展,两湖已经富营养化.因为湖泊体积容量的级别差异,深水湖的富营养化几乎没被注意,抚仙湖秋季下层滞水带缺氧已经关注了20年,似乎下层滞水带是深水湖富营养化的指标或趋势.抚仙湖看起来目前情况尚好,可以说寡营养,然而,外界负荷是潜在的,且是以稳定的加速度进行的.在此对浅水湖富营养化的原因进行了讨论,包括在其它云南湖泊观察到富营养化的过程,再者,对两个相连湖的藻和蓝藻碎片的大小构成进行比照.为了与深水的抚仙湖状况进行比较,简略介绍了一个日本的深湖及其径流系统.其中,涡流和它的微生态系统,在两者中相关性很好.对于以涡流生态系统的见解判断微生态系统的深水湖富营养化问题将给予概括.%A deep Fuxian Lake in Yunnan Province of China, is connected to a shallow and highly eutrophicated Lake,Xingyun, which drains the greenish algae water into Fuxian Lake. The connected lakes are located close to the provincial capital, Kunming city, so that they have been eutrophicated due to regional civilization, agricultural concentration and increasing tourism. Because of the difference of two orders in their volumetric capacities, the eutrophication in the deep and larger lake has been minded little so far. Anaerobic hypolimnetic water of Fuxian Lake in autumn has been noticed for about 20 years, which seems a eutrophic criteria or tendency for those deep lakes. Fuxian Lake looks temporary good and said to be oligotrophic, however, the external loading is implicitly but steadily accelerated. It is discussed here first on the reason of shallow lake eutrophication, including processes observed in other Yunnan lakes, then the size composition of algae and cyanobacterial fraction are compared between the connected lakes. As a deep lake to compare with Fuxian Lake situation, a Japanese deep lake and its current system are briefly introduced, in which, the gyre current and its micro ecosystem are deeply related each other. The problem would be generalized in view of the gyre ecosystem to judge the micro ecosystem for the deep lake eutrophication.
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