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首页> 外文期刊>Aquatic Sciences >The role of phosphorus in growth of phytoplankton in Lake Vesijarvi, southern Finland-a multitechnique appraoch
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The role of phosphorus in growth of phytoplankton in Lake Vesijarvi, southern Finland-a multitechnique appraoch

机译：磷在芬兰南部维西耶尔维湖中的浮游植物生长中的作用

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The role of phosphorus in phytoplankton growth was studied in Lake Vesijarvi, a large previously eutrophic body of water with a history of flourishing fishery. The study combined different approaches: long-term algal enrichment experiments with natural phytoplankton assemblages were carried out together with observations on nutrient and chlorophyll a concentrations, elemental ratios (N:P, C:P, C:N) of particulate matter, and analysis of P uptake using [~(33)P]. None of the approaches revealed periods of P limitation, but some growth experiments as well as elemental ratios indicated slight deficiency in early summer. Concentrations of total dissolved phosphorus (TDP), which were usually 20-30 μg l~(-1), also indicated luxurious P resources. Thermal stratification was weak and the lake mixed twice during the study period; this was reflected in the phytoplankton biomass that increased up to 4-fold. Results of elemental ratios usually suggested the occurrence of nitrogen limitation, and in general these ratios were low for a lake. All size fractions >0.22 μm in the experiments with [~(33)P] showed P uptake. In August most of the P was taken up by picoplankton, but when the lake turned over in September, the uptake of P by this fraction was absent. Thus, there was always a plentiful supply of P for phytoplankton, but the shortage of inorganic N may have affected those algae not capable of fixing N_2. These conditions should have favoured the growth of heterocystous cyanobacteria, but these prokaryotes never attained high abundances. This may have been due to the weak stability of the water column, or the growth of cyanobacteria may have been limited by trace elements such as molybdenum or iron.
机译：在韦西耶尔维湖（Lake Vesijarvi）中研究了磷在浮游植物生长中的作用，该湖以前是富营养化的大型水体，有悠久的渔业历史。这项研究结合了不同的方法：利用天然浮游植物组合进行了长期藻类富集实验，并观察了营养物和叶绿素a的浓度，颗粒物的元素比（N：P，C：P，C：N）并进行了分析。 [〜（33）P]吸收P。这些方法都没有揭示出磷限制的时期，但是一些生长实验以及元素比率表明初夏略有不足。总溶解磷（TDP）的浓度通常为20〜30μgl〜（-1），也表明了丰富的磷资源。在研究期间，热分层很弱，湖泊混合了两次；这反映在浮游植物生物量增加到4倍。元素比率的结果通常表明存在氮限制，并且总体而言，这些比率对于湖泊而言较低。在[〜（33）P]的实验中，所有大于0.22μm的粒径分数均显示P吸收。在8月，大部分的P被微微浮游生物吸收，但是当9月湖面翻身时，该比例的P被吸收。因此，总有大量的P用于浮游植物，但是无机N的缺乏可能会影响那些无法固定N_2的藻类。这些条件本来应该有利于异性藻蓝细菌的生长，但是这些原核生物从未达到很高的丰度。这可能是由于水柱的稳定性较弱，或者蓝细菌的生长可能受到微量元素（例如钼或铁）的限制。

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