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Recovery of Lake Geneva from eutrophication: quantitative response of phytoplankton

机译：从富营养化中恢复日内瓦湖：浮游植物的定量反应

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During the seventies Lake Geneva (Switzerland-France) became eutrophic. Measures to reduce phosphorus inputs into the lake have been successful as the concentration of phosphorus has progressively decreased since 1981. This paper describes the long-term quantitative response of phytoplankton (primary production, total phytoplankton biomass, and chlorophyll-a) with regard to the decline in soluble reactive phosphorus (SRP) concentration. The annual means of phytoplankton parameters do not show the expected decrease. The long-term trends of annual means appeared to be the resultant of compensating trends which occurred in each season. SRP concentrations indicate that phytoplankton may be phosphorus limited only during summer which appears to be the most appropriate season to study the quantitative response of phytoplankton. From 1981 to 1992, the summer algal biomass and chlorophyll-a have been correlated to the late winter concentration of SRP. However, in the recent years, algal biomass and chlorophyll-a increased while phosphorus remained at low concentrations. This paradoxal increase in total biomass was due to the accumulation of inedible filamentous algae. The observed resilience of phytoplankton is a problem in terms of lake management. These results stress the importance of an appropriate time scale study and bring back into question the use of parameters such as primary production, total phytoplankton biomass, and chlorophyll-a for lake management. [References: 50]
机译：在70年代，日内瓦湖（瑞士-法国）变得富营养化。自1981年以来，随着磷浓度的逐渐降低，减少湖泊中磷输入的措施已获得成功。本文描述了对浮游植物的长期定量响应（初级产量，总浮游生物量和叶绿素a）。可溶性反应性磷（SRP）浓度下降。浮游植物参数的年度平均值未显示出预期的下降。年均收入的长期趋势似乎是每个季节发生的补偿趋势的结果。 SRP浓度表明浮游植物可能仅在夏季受到磷的限制，而这似乎是研究浮游植物定量反应的最合适的季节。从1981年到1992年，夏季藻类生物量和叶绿素-a与冬末SRP浓度相关。然而，近年来，藻类生物量和叶绿素-a增加，而磷保持在低浓度。总生物量的这种矛盾增加是由于不可食的丝状藻类的积累。就湖泊管理而言，观察到的浮游植物的复原力是一个问题。这些结果强调了进行适当时间尺度研究的重要性，并使人们对诸如初级生产，浮游植物总生物量和叶绿素-a等参数对湖泊管理的使用产生了疑问。 [参考：50]

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