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首页> 外文期刊>Archiv fur Hydrobiologie >The impact of changes in nutrient loading on cyanobacterial dominance in Lake Peipsi (Estonia/Russia)
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The impact of changes in nutrient loading on cyanobacterial dominance in Lake Peipsi (Estonia/Russia)

机译:营养盐含量变化对百事可乐湖(爱沙尼亚/俄罗斯)的蓝细菌优势的影响

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摘要

The influence of changes in nitrogen (N) and phosphorus (P) loadings in 1983-2001 on cyanobacterial development in Lake Peipsi (3.555 km(2), mean depth 7.1 m) was studied. After the collapse of Soviet-type agriculture in the early 1990 s, total N loadings decreased sharply while the in-lake total P concentration increased, forming favourable conditions for harmful bloom-forming N, fixing (N(2)fix) cyanobacteria. The average percentage of the biomass of N(2)fix cyanobacteria in total phytoplankton biomass increased from 13 % in 1983-1991 to 29 % in 1992-2001. Gloeotrichia echinulata, a species capable of vertical migration and consequent transport of P from the lake bottom to the upper layers developed earlier in the season (June) at lower nutrient concentrations than other cyanobacteria in L. Peipsi (Anabaena, Aphanizomenon, Microcystis). The fixation of N-2 by G. echinulata as well as its ability to use sediment phosphorus could bring about the enrichment of the water column with nutrients. This enables the other N(2)fix species Anabaena and Aphanizomenon as well as Microcystis, which is not generally N-2 fixing but requires high nutrient concentrations, to flourish.
机译:研究了1983-2001年氮(N)和磷(P)含量变化对Peipsi湖(3.555 km(2),平均深度7.1 m)蓝细菌发育的影响。在1990年代初期苏维埃式农业崩溃之后,总氮含量急剧下降,而湖内总磷浓度增加,这为形成有害水华的固氮(N(2)fix)蓝细菌形成了有利条件。 N(2)固定蓝藻生物量在浮游植物总生物量中的平均百分比从1983-1991年的13%增加到1992-2001年的29%。 Gloeotrichia echinulata是一种能够垂直迁移并随后将P从湖底迁移到上层的磷物种,在本季节(6月)发育得比L. Peipsi的其他蓝细菌(Anabaena,Aphanizomenon,Microcystis)的营养浓度低。 G. echinulata对N-2的固定作用及其对沉积物磷的利用能力可以使水柱中的养分富集。这使其他N(2)固定种Anabaena和Aphanizomenon以及微囊藻得以蓬勃发展,而这些微囊藻通常不是N-2固定的,但需要高营养浓度。

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