Variations in environmental factors and their effects on biological characteristics of meromictic Lake Abashiri
Variations in environmental factors and their effects on biological characteristics of meromictic Lake Abashiri
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网走湖环境因子变化及其对生物特性的影响
DOI：
10.1007/s102010200011
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发表时间：
2002
期刊：
影响因子：
1.6
通讯作者：
J. Arisue
中科院分区：
文献类型：
--
作者：
H. Mikami;S. Hino;K. Sakata;J. Arisue
为了阐明日本阿巴什里湖富营养化、微咸水化的环境因素和生物学特性的变化，我们研究了湖水中氯离子和营养盐浓度的长期变化及其供应特征。这个湖有一个缺氧层，含有大量的氯化物、营养物质和硫化物。虽然在1986年前的每个夏天都会出现密集的Anabaenablom水华，但在1987年春季发生从底层上升流(一种蓝色潮汐)后，没有出现水华。光合作用细菌(Chlorobiumsp.)1989年至1992年5月在缺氧层顶部形成。氧化层中营养盐和氯化物的浓度取决于进水河流的营养物质(包括溶解的无机氮)和从缺氧层提供的物质(包括氯化物和溶解的无机磷)之间的平衡。这些影响控制了优势浮游植物种类及其生物量。阿巴什里湖Anabaenabloom的出现受进水负荷减少引起的氮限制和/或缺氧层稳定的磷供应(不形成光合细菌层和小上升流)的促进，但高氯离子浓度和大上升流抑制了Anabaenablom的出现。从到1992年5月，光合细菌层形成的主要原因是太阳光到达缺氧层的顶部，这是由于上升流抑制了藻类的生长而使透明度增加所致。光合细菌的致密层通过吸收阻止了营养物质从缺氧层向氧层的扩散，降低了氧层中浮游植物的生物量。
To clarify the variations in environmental factors and biological characteristics of eutrophic, brackish, meromictic Lake Abashiri, Japan, we studied long-term variations in concentrations of chloride and nutrients in lake water and characteristics of their supply. This lake has an anoxic layer containing much chloride, nutrients, and sulfide. Although a denseAnabaenabloom appeared in the lake every summer before 1986, the bloom did not appear after upwelling from the bottom layer (a blue tide) occurred in spring 1987. A dense layer of photosynthetic bacteria (Chlorobiumsp.) formed at the top of the anoxic layer from 1989 to May 1992. The concentrations of nutrients and chloride in the oxygenic layer were determined by the balance between nutrients from influent rivers, including dissolved inorganic nitrogen, and matter supplied from the anoxic layer, including chloride and dissolved inorganic phosphorus. These influences controlled the dominant phytoplankton species and their biomass. The appearance of anAnabaenabloom in Lake Abashiri is promoted by nitrogen limitation caused by decreased loading from influent rivers and/or by a stable supply of phosphorus from the anoxic layer (no formation of photosynthetic bacterial layer and small upwelling), but the appearance is inhibited by a high chloride ion concentration with large upwelling. The main reason for the formation of a photosynthetic bacterial layer from 1989 to May 1992 was that sunlight reached the top of the anoxic layer because of the increase in transparency due to inhibition of theAnabaenabloom with upwelling. The dense layer of photosynthetic bacteria blocked nutrient diffusion from the anoxic layer to the oxygenic layer by uptake, and decreased the biomass of phytoplankton in the oxygenic layer.