Limnological studies in a large, deep, oligotrophic lake (Lake Ohrid, Yugoslavia). A summary of nutritional radiobioassay responses of the pelagial phytoplankton
Limnological studies in a large, deep, oligotrophic lake (Lake Ohrid, Yugoslavia). A summary of nutritional radiobioassay responses of the pelagial phytoplankton
复制标题
在一个大而深的贫营养湖（南斯拉夫奥赫里德湖）进行湖泊学研究。
DOI：
10.1007/bf00021231
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发表时间：
1977
期刊：
影响因子：
2.6
通讯作者：
B. Ocevski
中科院分区：
文献类型：
--
作者：
H. L. Allen;B. Ocevski
在1972-1974年期间，使用原位碳-14生物测定技术，估计营养偏好和需求的浮游植物在奥赫里德湖，南斯拉夫。生物测定测量，进行了时空，并适当校正，显示了强烈的刺激，在大多数季节在表层沃茨的浮游植物光合速率后，无机硅和铁的微量添加。光合刺激是添加剂的单个元素和协同作用时，同时添加。春季期间，这两种元素都出现了明显的刺激，尤其是在上层下水淹层沃茨水域（50-75 m），并且与优势硅藻种群密切相关。添加有机螯合剂次氮基三乙酸（NTA）通常会刺激光合作用速率，并且通常在15 m深处，远低于光合作用最佳光照深度。除了少数例外，同时加入这种螯合剂和无机铁总是能够产生刺激反应。无机磷比氮更受欢迎，并且通常被发现更具刺激性。磷刺激主要限于春季和夏季生产期间。葡萄糖、乙酸盐和甘氨酸的加入产生了积极的反应，而几种维生素的加入除了微量B12的刺激外几乎没有什么影响。两种有机生长物质，赤霉酸（GA）和吲哚乙酸（IAA）的加入，都刺激浮游植物光合作用。超过140个生物测定的结果表明，浮游植物的营养严重限制，由于特定的物理-化学相互作用发生在奥赫里德湖。类似的机制已被假定和评估在其他手水湖泊系统。尽管湖的深度很大（300米以上）和可能的年龄，这些机制无疑是负责低浮游植物生产发生在湖中。
In situ carbon-14 bioassay techniques were used during 1972–1974 to estimate nutritional preferences and requirements of the pelagial phytoplankton in Lake Ohrid, Yugoslavia.Bioassay measurements, conducted spatially and temporally, and corrected appropriately, showed a strong stimulation to phytoplankton photosynthesis rates during most seasons in epilimnetic waters following microadditions of inorganic silica and iron. Photosynthetic stimulation was additive for individual elements and synergistic when simultaneous additions were made. Marked stimulation occurred for both elements during the spring, especially in upper hypolimnetic waters (50–75 m) and correlated strongly with dominant diatom populations.The addition of an organic chelator, nitrilotriaceticacid (NTA), commonly stimulated photosynthetic rates and, frequently, as deep as 15o m, considerably below the depth of optimal light availability for photosynthesis. With minor exception, the simultaneous addition of this chelator and inorganic iron were always capable of producing stimulatory responses.Inorganic phosphorus was preferred over nitrogen and generally found to be more stimulatory. Phosphorus stimulation was restricted primarily to periods of spring and summer production. The addition of glucose, acetate and glycine produced positive responses, while the addition of several vitamins showed little effect except for a stimulation from microamounts of B12. The addition of two organic growth substances, Gibberellic acid (GA) and Indoleacetic acid (IAA), both stimulated phytoplankton photosynthesis.The results of more than 140 bioassay measurements indicate the pelagial phytoplankton are severely restricted nutritionally due to specific physical-chemical interactions occurring in Lake Ohrid. Similar mechanisms have been postulated and evaluated in other hand-water lake systems. In spite of the great depth of the lake (300 m+) and probable age, these mechanisms are undoubtedly responsible for the low phytoplankton production occuring in the lake.