Study on Limnological Comparison of water Quality Variation in Japanese/Chinese Eutrophic Lakes

为了弄清中日两国湖泊富营养化机制的异同，于1988~1990年对云南中国境内的洱海、齐鲁、滇池三个湖泊进行了调查。结果表明，云南省湖泊富营养化程度较高，洱海湖泊TSI介于27~59之间，平均为40。颗粒物浓度相对低于COD浓度。枯枝落叶层中生长着大量沉水植物。洱海目前处于中营养状态，齐鲁湖TSI介于59~86之间，平均为74。该湖具有较高的氮磷比。该湖处于富营养化状态，滇池草海水质与昆明市入湖河流水质密切相关，处于重度富营养化状态。草海中部的TSI数在70~101之间，1988年平均值为76,1989年平均值为86。草海是一种氧化塘，昆明市污水在草海进行了处理。在滇池主流域外海，TSI数在57~77之间，1988年平均值为63,1989年平均值为69。与草海相比，外海的水质有了极大的改善。

The object of the study is to clarify the resemblance and/or difference of the mechanisms of eutrophication in Japanese and Chinese lakes.Three lakes (L. Erhai, L. Qilu and L. Dianchi) in Yunnan Province in China were surveyed during 1988 to 1990. The results suggested that lakes in Yunnan Province are considerably eutrophicated.In Lake Erhai, TSI numbers ranged from 27 to 59 with an average of 40. Concentrations of particulated matters were relatively lower than COD concentration. A large amount of submersed macrophytes grew in the littral zone. Lake Erhai is in a mesotrophic state in present condition.In Lake Qilu, TSI numbers ranged 59 to 86 with an average of 74. High N/P ratio was oberved in this lake. This lake is in an eutrophic state.In Caohai of Lake Dianchi, water quality has strong relation to that of inflow rivers from Kunming City, and in a was sever eutrophic condition. TSI numbers at central part of Caohai ranged from 70 to 101 with averages of 76 in 1988 and 86 in 1989. A large amount of nutrient was removed in this region Caohai appeared to be some kind of oxidation pond, and waste water of Kunming City was treated in Caohai. In Waihai, main basin of Lake Dianchi, TSI numbers ranged from 57 to 77 with averages of 63 in 1988 and 69 in 1989. Water quality of Waihai was extremely improved in comparison with that of Caohai.